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<!DOCTYPE html>
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11.5962ZM9.82816 14C9.342 14 8.94767 13.6273 8.94767 13.1519C8.94767 12.6766 9.342 12.3038 9.82816 12.3038C10.3197 12.3038 10.714 12.6766 10.714 13.1519C10.714 13.6273 10.3197 14 9.82816 14Z"></path></svg></div></button></div></div></div></header><div class="relative flex basis-auto flex-col -mb-(--composer-overlap-px) [--composer-overlap-px:55px] grow overflow-hidden"><div class="relative h-full"><div class="flex h-full flex-col overflow-y-auto [scrollbar-gutter:stable_both-edges] @[84rem]/thread:pt-(--header-height)"><div aria-hidden="true" data-edge="true" class="pointer-events-none h-px w-px"></div><div class="@thread-xl/thread:pt-header-height flex flex-col text-sm pb-25" style=""><article class="text-token-text-primary w-full focus:outline-none scroll-mt-(--header-height)" tabindex="-1" dir="auto" data-turn-id="bfb1d801-e5ca-42df-9dd9-815a1854b710" data-testid="conversation-turn-1" data-scroll-anchor="false" data-turn="user"><h5 class="sr-only">You said:</h5><div class="text-base my-auto mx-auto pt-3 [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)"><div class="[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col" tabindex="-1"><div class="flex max-w-full flex-col grow"><div data-message-author-role="user" data-message-id="bfb1d801-e5ca-42df-9dd9-815a1854b710" dir="auto" class="min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-5"><div class="flex w-full flex-col gap-1 empty:hidden items-end rtl:items-start"><div class="user-message-bubble-color relative max-w-[var(--user-chat-width,70%)] rounded-[18px] px-4 py-1.5 data-[multiline]:py-3" data-multiline=""><div class="whitespace-pre-wrap">list down all the ways to read and write file in java with each minor detail explanation and with best practices.</div></div></div></div></div><div class="flex justify-end"><div class="touch:-me-2 touch:-ms-3.5 -ms-2.5 -me-1 flex flex-wrap items-center gap-y-4 p-1 select-none focus-within:transition-none hover:transition-none duration-300 group-hover/turn-messages:delay-300 pointer-events-none opacity-0 motion-safe:transition-opacity group-hover/turn-messages:pointer-events-auto group-hover/turn-messages:opacity-100 group-focus-within/turn-messages:pointer-events-auto group-focus-within/turn-messages:opacity-100 has-data-[state=open]:pointer-events-auto has-data-[state=open]:opacity-100" style="mask-position: 0% 0%;"><button class="text-token-text-secondary hover:bg-token-bg-secondary rounded-lg" aria-label="Copy" aria-pressed="false" data-testid="copy-turn-action-button" data-state="closed"><span class="touch:w-10 flex h-8 w-8 items-center 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7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg></span></button></div></div></div></div></article><article class="text-token-text-primary w-full focus:outline-none scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]" tabindex="-1" dir="auto" data-turn-id="request-WEB:63aa729f-864a-43f2-a814-f593a8814a1c-0" data-testid="conversation-turn-2" data-scroll-anchor="false" data-turn="assistant"><h6 class="sr-only">ChatGPT said:</h6><div class="text-base my-auto mx-auto [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)"><div class="[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn" tabindex="-1"><div class="flex max-w-full flex-col grow"><div data-message-author-role="assistant" data-message-id="71d15df8-31f7-42d4-a011-0b669097ca44" dir="auto" class="min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-5" data-message-model-slug="gpt-4o"><div class="flex w-full flex-col gap-1 empty:hidden first:pt-[3px]"><div class="markdown prose dark:prose-invert w-full break-words dark markdown-new-styling"><p data-start="0" data-end="292">Reading and writing files in Java is a fundamental task, and Java offers a wide range of options to handle file I/O efficiently. Below is a comprehensive list of <strong data-start="162" data-end="216">all the major ways to read and write files in Java</strong>, with <strong data-start="223" data-end="248">detailed explanations</strong>, <strong data-start="250" data-end="267">code examples</strong>, and <strong data-start="273" data-end="291">best practices</strong>.</p>
<hr data-start="294" data-end="297">
<h2 data-start="299" data-end="322">🔹 BASIC TERMINOLOGY</h2>
<ul data-start="324" data-end="813">
<li data-start="324" data-end="381">
<p data-start="326" data-end="381"><strong data-start="326" data-end="351">FileReader/FileWriter</strong>: Character-based I/O classes.</p>
</li>
<li data-start="382" data-end="445">
<p data-start="384" data-end="445"><strong data-start="384" data-end="420">FileInputStream/FileOutputStream</strong>: Byte-based I/O classes.</p>
</li>
<li data-start="446" data-end="540">
<p data-start="448" data-end="540"><strong data-start="448" data-end="481">BufferedReader/BufferedWriter</strong>: Wrapper classes that improve performance using buffering.</p>
</li>
<li data-start="541" data-end="615">
<p data-start="543" data-end="615"><strong data-start="543" data-end="554">Scanner</strong>: For reading text using regular expressions or line-by-line.</p>
</li>
<li data-start="616" data-end="667">
<p data-start="618" data-end="667"><strong data-start="618" data-end="633">PrintWriter</strong>: Writing formatted text to files.</p>
</li>
<li data-start="668" data-end="741">
<p data-start="670" data-end="741"><strong data-start="670" data-end="695">Files (java.nio.file)</strong>: High-level, modern utility methods from NIO.</p>
</li>
<li data-start="742" data-end="813">
<p data-start="744" data-end="813"><strong data-start="744" data-end="764">RandomAccessFile</strong>: For non-sequential read/write (like databases).</p>
</li>
</ul>
<hr data-start="815" data-end="818">
<h2 data-start="820" data-end="878">📘 1. <code data-start="829" data-end="841">FileReader</code> and <code data-start="846" data-end="858">FileWriter</code> (Character Streams)</h2>
<h3 data-start="880" data-end="895">✅ Use Case:</h3>
<ul data-start="896" data-end="955">
<li data-start="896" data-end="952">
<p data-start="898" data-end="952">Reading and writing text files (character-based data).</p>
</li>
</ul>
<h3 data-start="956" data-end="971">🔸 Reading:</h3>
<pre class="overflow-visible!" data-start="973" data-end="1193"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.FileReader;
</span><span><span class="hljs-keyword">import</span></span><span> java.io.IOException;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">FileReader</span></span><span> </span><span><span class="hljs-variable">reader</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileReader</span></span><span>(</span><span><span class="hljs-string">"file.txt"</span></span><span>)) {
</span><span><span class="hljs-type">int</span></span><span> ch;
</span><span><span class="hljs-keyword">while</span></span><span> ((ch = reader.read()) != -</span><span><span class="hljs-number">1</span></span><span>) {
System.out.print((</span><span><span class="hljs-type">char</span></span><span>) ch);
}
}
</span></span></code></div></div></pre>
<h3 data-start="1195" data-end="1210">🔸 Writing:</h3>
<pre class="overflow-visible!" data-start="1212" data-end="1373"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.FileWriter;
</span><span><span class="hljs-keyword">import</span></span><span> java.io.IOException;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">FileWriter</span></span><span> </span><span><span class="hljs-variable">writer</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileWriter</span></span><span>(</span><span><span class="hljs-string">"output.txt"</span></span><span>)) {
writer.write(</span><span><span class="hljs-string">"Hello, world!"</span></span><span>);
}
</span></span></code></div></div></pre>
<h3 data-start="1375" data-end="1396">✅ Best Practices:</h3>
<ul data-start="1397" data-end="1562">
<li data-start="1397" data-end="1459">
<p data-start="1399" data-end="1459">Always close the reader/writer using <strong data-start="1436" data-end="1458">try-with-resources</strong>.</p>
</li>
<li data-start="1460" data-end="1519">
<p data-start="1462" data-end="1519">Avoid for large files (better use BufferedReader/Writer).</p>
</li>
<li data-start="1520" data-end="1562">
<p data-start="1522" data-end="1562">Handles <strong data-start="1530" data-end="1544">characters</strong>, not binary data.</p>
</li>
</ul>
<hr data-start="1564" data-end="1567">
<h2 data-start="1569" data-end="1615">📘 2. <code data-start="1578" data-end="1594">BufferedReader</code> and <code data-start="1599" data-end="1615">BufferedWriter</code></h2>
<h3 data-start="1617" data-end="1632">✅ Use Case:</h3>
<ul data-start="1633" data-end="1693">
<li data-start="1633" data-end="1693">
<p data-start="1635" data-end="1693">Efficient reading/writing of <strong data-start="1664" data-end="1678">text files</strong>, line-by-line.</p>
</li>
</ul>
<h3 data-start="1695" data-end="1710">🔸 Reading:</h3>
<pre class="overflow-visible!" data-start="1712" data-end="1921"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">BufferedReader</span></span><span> </span><span><span class="hljs-variable">br</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">BufferedReader</span></span><span>(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileReader</span></span><span>(</span><span><span class="hljs-string">"file.txt"</span></span><span>))) {
String line;
</span><span><span class="hljs-keyword">while</span></span><span> ((line = br.readLine()) != </span><span><span class="hljs-literal">null</span></span><span>) {
System.out.println(line);
}
}
</span></span></code></div></div></pre>
<h3 data-start="1923" data-end="1938">🔸 Writing:</h3>
<pre class="overflow-visible!" data-start="1940" data-end="2113"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">BufferedWriter</span></span><span> </span><span><span class="hljs-variable">bw</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">BufferedWriter</span></span><span>(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileWriter</span></span><span>(</span><span><span class="hljs-string">"output.txt"</span></span><span>))) {
bw.write(</span><span><span class="hljs-string">"Hello"</span></span><span>);
bw.newLine();
bw.write(</span><span><span class="hljs-string">"World"</span></span><span>);
}
</span></span></code></div></div></pre>
<h3 data-start="2115" data-end="2136">✅ Best Practices:</h3>
<ul data-start="2137" data-end="2292">
<li data-start="2137" data-end="2164">
<p data-start="2139" data-end="2164">Use for large text files.</p>
</li>
<li data-start="2165" data-end="2224">
<p data-start="2167" data-end="2224">Always wrap <code data-start="2179" data-end="2202">FileReader/FileWriter</code> in buffering classes.</p>
</li>
<li data-start="2225" data-end="2292">
<p data-start="2227" data-end="2292">Use <code data-start="2231" data-end="2242">newLine()</code> instead of <code data-start="2254" data-end="2258">\n</code> for cross-platform compatibility.</p>
</li>
</ul>
<hr data-start="2294" data-end="2297">
<h2 data-start="2299" data-end="2363">📘 3. <code data-start="2308" data-end="2325">FileInputStream</code> and <code data-start="2330" data-end="2348">FileOutputStream</code> (Byte Streams)</h2>
<h3 data-start="2365" data-end="2380">✅ Use Case:</h3>
<ul data-start="2381" data-end="2437">
<li data-start="2381" data-end="2437">
<p data-start="2383" data-end="2437">Reading/writing <strong data-start="2399" data-end="2415">binary files</strong> (e.g., images, PDFs).</p>
</li>
</ul>
<h3 data-start="2439" data-end="2454">🔸 Reading:</h3>
<pre class="overflow-visible!" data-start="2456" data-end="2635"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">FileInputStream</span></span><span> </span><span><span class="hljs-variable">fis</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileInputStream</span></span><span>(</span><span><span class="hljs-string">"image.jpg"</span></span><span>)) {
</span><span><span class="hljs-type">int</span></span><span> data;
</span><span><span class="hljs-keyword">while</span></span><span> ((data = fis.read()) != -</span><span><span class="hljs-number">1</span></span><span>) {
</span><span><span class="hljs-comment">// process byte</span></span><span>
}
}
</span></span></code></div></div></pre>
<h3 data-start="2637" data-end="2652">🔸 Writing:</h3>
<pre class="overflow-visible!" data-start="2654" data-end="2796"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">FileOutputStream</span></span><span> </span><span><span class="hljs-variable">fos</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileOutputStream</span></span><span>(</span><span><span class="hljs-string">"copy.jpg"</span></span><span>)) {
fos.write(</span><span><span class="hljs-string">"Some binary data"</span></span><span>.getBytes());
}
</span></span></code></div></div></pre>
<h3 data-start="2798" data-end="2819">✅ Best Practices:</h3>
<ul data-start="2820" data-end="2948">
<li data-start="2820" data-end="2900">
<p data-start="2822" data-end="2900">Wrap with <code data-start="2832" data-end="2853">BufferedInputStream</code>/<code data-start="2854" data-end="2876">BufferedOutputStream</code> for better performance.</p>
</li>
<li data-start="2901" data-end="2948">
<p data-start="2903" data-end="2948">Always close streams with try-with-resources.</p>
</li>
</ul>
<hr data-start="2950" data-end="2953">
<h2 data-start="2955" data-end="3012">📘 4. <code data-start="2964" data-end="2985">BufferedInputStream</code> and <code data-start="2990" data-end="3012">BufferedOutputStream</code></h2>
<h3 data-start="3014" data-end="3029">✅ Use Case:</h3>
<ul data-start="3030" data-end="3087">
<li data-start="3030" data-end="3087">
<p data-start="3032" data-end="3087">Efficient handling of <strong data-start="3054" data-end="3070">binary files</strong>, with buffering.</p>
</li>
</ul>
<pre class="overflow-visible!" data-start="3089" data-end="3458"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">BufferedInputStream</span></span><span> </span><span><span class="hljs-variable">bis</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">BufferedInputStream</span></span><span>(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileInputStream</span></span><span>(</span><span><span class="hljs-string">"largefile.bin"</span></span><span>));
</span><span><span class="hljs-type">BufferedOutputStream</span></span><span> </span><span><span class="hljs-variable">bos</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">BufferedOutputStream</span></span><span>(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileOutputStream</span></span><span>(</span><span><span class="hljs-string">"copy.bin"</span></span><span>))) {
</span><span><span class="hljs-type">byte</span></span><span>[] buffer = </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">byte</span></span><span>[</span><span><span class="hljs-number">1024</span></span><span>];
</span><span><span class="hljs-type">int</span></span><span> length;
</span><span><span class="hljs-keyword">while</span></span><span> ((length = bis.read(buffer)) != -</span><span><span class="hljs-number">1</span></span><span>) {
bos.write(buffer, </span><span><span class="hljs-number">0</span></span><span>, length);
}
}
</span></span></code></div></div></pre>
<h3 data-start="3460" data-end="3481">✅ Best Practices:</h3>
<ul data-start="3482" data-end="3600">
<li data-start="3482" data-end="3526">
<p data-start="3484" data-end="3526">Use <strong data-start="3488" data-end="3500">buffered</strong> versions for performance.</p>
</li>
<li data-start="3527" data-end="3600">
<p data-start="3529" data-end="3600">Choose a buffer size (e.g., 1024 or 4096 bytes) depending on file size.</p>
</li>
</ul>
<hr data-start="3602" data-end="3605">
<h2 data-start="3607" data-end="3639">📘 5. <code data-start="3616" data-end="3625">Scanner</code> (For Reading)</h2>
<h3 data-start="3641" data-end="3656">✅ Use Case:</h3>
<ul data-start="3657" data-end="3724">
<li data-start="3657" data-end="3724">
<p data-start="3659" data-end="3724">Convenient for reading <strong data-start="3682" data-end="3690">text</strong> using delimiters or line-by-line.</p>
</li>
</ul>
<pre class="overflow-visible!" data-start="3726" data-end="3934"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">import</span></span><span> java.util.Scanner;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">Scanner</span></span><span> </span><span><span class="hljs-variable">scanner</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">Scanner</span></span><span>(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">File</span></span><span>(</span><span><span class="hljs-string">"data.txt"</span></span><span>))) {
</span><span><span class="hljs-keyword">while</span></span><span> (scanner.hasNextLine()) {
System.out.println(scanner.nextLine());
}
}
</span></span></code></div></div></pre>
<h3 data-start="3936" data-end="3957">✅ Best Practices:</h3>
<ul data-start="3958" data-end="4036">
<li data-start="3958" data-end="3985">
<p data-start="3960" data-end="3985">Use for small text files.</p>
</li>
<li data-start="3986" data-end="4036">
<p data-start="3988" data-end="4036">Not ideal for performance-critical applications.</p>
</li>
</ul>
<hr data-start="4038" data-end="4041">
<h2 data-start="4043" data-end="4079">📘 6. <code data-start="4052" data-end="4065">PrintWriter</code> (For Writing)</h2>
<h3 data-start="4081" data-end="4096">✅ Use Case:</h3>
<ul data-start="4097" data-end="4148">
<li data-start="4097" data-end="4148">
<p data-start="4099" data-end="4148">Writing formatted text, numbers, etc., to a file.</p>
</li>
</ul>
<pre class="overflow-visible!" data-start="4150" data-end="4320"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.PrintWriter;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">PrintWriter</span></span><span> </span><span><span class="hljs-variable">writer</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">PrintWriter</span></span><span>(</span><span><span class="hljs-string">"output.txt"</span></span><span>)) {
writer.println(</span><span><span class="hljs-string">"Hello"</span></span><span>);
writer.printf(</span><span><span class="hljs-string">"Pi: %.2f"</span></span><span>, Math.PI);
}
</span></span></code></div></div></pre>
<h3 data-start="4322" data-end="4343">✅ Best Practices:</h3>
<ul data-start="4344" data-end="4435">
<li data-start="4344" data-end="4402">
<p data-start="4346" data-end="4402">Use when formatting is needed (similar to <code data-start="4388" data-end="4400">System.out</code>).</p>
</li>
<li data-start="4403" data-end="4435">
<p data-start="4405" data-end="4435">Supports buffering internally.</p>
</li>
</ul>
<hr data-start="4437" data-end="4440">
<h2 data-start="4442" data-end="4488">📘 7. <code data-start="4451" data-end="4458">Files</code> (NIO – <code data-start="4466" data-end="4487">java.nio.file.Files</code>)</h2>
<h3 data-start="4490" data-end="4505">✅ Use Case:</h3>
<ul data-start="4506" data-end="4622">
<li data-start="4506" data-end="4543">
<p data-start="4508" data-end="4543">Modern, simplified file operations.</p>
</li>
<li data-start="4544" data-end="4622">
<p data-start="4546" data-end="4622">Useful for <strong data-start="4557" data-end="4578">reading all lines</strong>, <strong data-start="4580" data-end="4599">writing strings</strong>, or <strong data-start="4604" data-end="4621">copying files</strong>.</p>
</li>
</ul>
<h3 data-start="4624" data-end="4651">🔸 Reading Entire File:</h3>
<pre class="overflow-visible!" data-start="4653" data-end="4864"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.nio.file.*;
</span><span><span class="hljs-keyword">import</span></span><span> java.io.IOException;
</span><span><span class="hljs-keyword">import</span></span><span> java.util.List;
List<String> lines = Files.readAllLines(Paths.get(</span><span><span class="hljs-string">"file.txt"</span></span><span>));
</span><span><span class="hljs-keyword">for</span></span><span> (String line : lines) {
System.out.println(line);
}
</span></span></code></div></div></pre>
<h3 data-start="4866" data-end="4881">🔸 Writing:</h3>
<pre class="overflow-visible!" data-start="4883" data-end="5011"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.nio.file.*;
Files.write(Paths.get(</span><span><span class="hljs-string">"output.txt"</span></span><span>), </span><span><span class="hljs-string">"Hello\nWorld"</span></span><span>.getBytes(), StandardOpenOption.CREATE);
</span></span></code></div></div></pre>
<h3 data-start="5013" data-end="5034">✅ Best Practices:</h3>
<ul data-start="5035" data-end="5168">
<li data-start="5035" data-end="5071">
<p data-start="5037" data-end="5071">Prefer for simple file operations.</p>
</li>
<li data-start="5072" data-end="5123">
<p data-start="5074" data-end="5123"><code data-start="5074" data-end="5093">Files.lines(Path)</code> is lazy and memory-efficient.</p>
</li>
<li data-start="5124" data-end="5168">
<p data-start="5126" data-end="5168">Use <code data-start="5130" data-end="5157">StandardOpenOption.APPEND</code> to append.</p>
</li>
</ul>
<hr data-start="5170" data-end="5173">
<h2 data-start="5175" data-end="5202">📘 8. <code data-start="5184" data-end="5202">RandomAccessFile</code></h2>
<h3 data-start="5204" data-end="5219">✅ Use Case:</h3>
<ul data-start="5220" data-end="5293">
<li data-start="5220" data-end="5248">
<p data-start="5222" data-end="5248">Non-sequential read/write.</p>
</li>
<li data-start="5249" data-end="5293">
<p data-start="5251" data-end="5293">Useful in databases or file-based indexes.</p>
</li>
</ul>
<pre class="overflow-visible!" data-start="5295" data-end="5593"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.RandomAccessFile;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">RandomAccessFile</span></span><span> </span><span><span class="hljs-variable">file</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">RandomAccessFile</span></span><span>(</span><span><span class="hljs-string">"data.dat"</span></span><span>, </span><span><span class="hljs-string">"rw"</span></span><span>)) {
file.seek(</span><span><span class="hljs-number">100</span></span><span>); </span><span><span class="hljs-comment">// Move pointer to byte 100</span></span><span>
file.write(</span><span><span class="hljs-string">"Hello"</span></span><span>.getBytes()); </span><span><span class="hljs-comment">// Overwrite at that location</span></span><span>
file.seek(</span><span><span class="hljs-number">0</span></span><span>);
</span><span><span class="hljs-type">byte</span></span><span>[] b = </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">byte</span></span><span>[</span><span><span class="hljs-number">5</span></span><span>];
file.read(b);
}
</span></span></code></div></div></pre>
<h3 data-start="5595" data-end="5616">✅ Best Practices:</h3>
<ul data-start="5617" data-end="5736">
<li data-start="5617" data-end="5654">
<p data-start="5619" data-end="5654">Use when random access is required.</p>
</li>
<li data-start="5655" data-end="5693">
<p data-start="5657" data-end="5693">Not memory efficient for huge files.</p>
</li>
<li data-start="5694" data-end="5736">
<p data-start="5696" data-end="5736">Don't use unless you need random access.</p>
</li>
</ul>
<hr data-start="5738" data-end="5741">
<h2 data-start="5743" data-end="5785">📘 9. Java NIO (Channels & ByteBuffers)</h2>
<h3 data-start="5787" data-end="5802">✅ Use Case:</h3>
<ul data-start="5803" data-end="5878">
<li data-start="5803" data-end="5878">
<p data-start="5805" data-end="5878">High-performance I/O, non-blocking, suitable for large files and servers.</p>
</li>
</ul>
<h3 data-start="5880" data-end="5895">🔸 Example:</h3>
<pre class="overflow-visible!" data-start="5897" data-end="6366"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">import</span></span><span> java.nio.ByteBuffer;
</span><span><span class="hljs-keyword">import</span></span><span> java.nio.channels.FileChannel;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">RandomAccessFile</span></span><span> </span><span><span class="hljs-variable">file</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">RandomAccessFile</span></span><span>(</span><span><span class="hljs-string">"largefile.txt"</span></span><span>, </span><span><span class="hljs-string">"rw"</span></span><span>);
</span><span><span class="hljs-type">FileChannel</span></span><span> </span><span><span class="hljs-variable">channel</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> file.getChannel()) {
</span><span><span class="hljs-type">ByteBuffer</span></span><span> </span><span><span class="hljs-variable">buffer</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> ByteBuffer.allocate(</span><span><span class="hljs-number">1024</span></span><span>);
</span><span><span class="hljs-keyword">while</span></span><span> (channel.read(buffer) > </span><span><span class="hljs-number">0</span></span><span>) {
buffer.flip();
</span><span><span class="hljs-keyword">while</span></span><span> (buffer.hasRemaining()) {
System.out.print((</span><span><span class="hljs-type">char</span></span><span>) buffer.get());
}
buffer.clear();
}
}
</span></span></code></div></div></pre>
<h3 data-start="6368" data-end="6389">✅ Best Practices:</h3>
<ul data-start="6390" data-end="6486">
<li data-start="6390" data-end="6436">
<p data-start="6392" data-end="6436">Prefer for scalable I/O, especially servers.</p>
</li>
<li data-start="6437" data-end="6486">
<p data-start="6439" data-end="6486">Requires understanding of buffers and channels.</p>
</li>
</ul>
<hr data-start="6488" data-end="6491">
<h2 data-start="6493" data-end="6523">📘 10. Object Serialization</h2>
<h3 data-start="6525" data-end="6540">✅ Use Case:</h3>
<ul data-start="6541" data-end="6588">
<li data-start="6541" data-end="6588">
<p data-start="6543" data-end="6588">Write/read entire Java objects to/from files.</p>
</li>
</ul>
<h3 data-start="6590" data-end="6605">🔸 Writing:</h3>
<pre class="overflow-visible!" data-start="6607" data-end="6771"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">ObjectOutputStream</span></span><span> </span><span><span class="hljs-variable">oos</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">ObjectOutputStream</span></span><span>(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileOutputStream</span></span><span>(</span><span><span class="hljs-string">"data.obj"</span></span><span>))) {
oos.writeObject(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">MyClass</span></span><span>(</span><span><span class="hljs-string">"data"</span></span><span>));
}
</span></span></code></div></div></pre>
<h3 data-start="6773" data-end="6788">🔸 Reading:</h3>
<pre class="overflow-visible!" data-start="6790" data-end="6955"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">import</span></span><span> java.io.*;
</span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">ObjectInputStream</span></span><span> </span><span><span class="hljs-variable">ois</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">ObjectInputStream</span></span><span>(</span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-title class_">FileInputStream</span></span><span>(</span><span><span class="hljs-string">"data.obj"</span></span><span>))) {
</span><span><span class="hljs-type">MyClass</span></span><span> </span><span><span class="hljs-variable">obj</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> (MyClass) ois.readObject();
}
</span></span></code></div></div></pre>
<blockquote data-start="6957" data-end="6999">
<p data-start="6959" data-end="6999"><code data-start="6959" data-end="6968">MyClass</code> must implement <code data-start="6984" data-end="6998">Serializable</code>.</p>
</blockquote>
<h3 data-start="7001" data-end="7022">✅ Best Practices:</h3>
<ul data-start="7023" data-end="7124">
<li data-start="7023" data-end="7063">
<p data-start="7025" data-end="7063">Use <code data-start="7029" data-end="7047">serialVersionUID</code> for versioning.</p>
</li>
<li data-start="7064" data-end="7124">
<p data-start="7066" data-end="7124">Avoid serializing sensitive data (or mark as <code data-start="7111" data-end="7122">transient</code>).</p>
</li>
</ul>
<hr data-start="7126" data-end="7129">
<h2 data-start="7131" data-end="7159">📌 BEST PRACTICES SUMMARY</h2>
<div class="_tableContainer_1rjym_1"><div tabindex="-1" class="_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse"><table data-start="7161" data-end="7693" class="w-fit min-w-(--thread-content-width)"><thead data-start="7161" data-end="7199"><tr data-start="7161" data-end="7199"><th data-start="7161" data-end="7177" data-col-size="md">Best Practice</th><th data-start="7177" data-end="7199" data-col-size="sm">Why It’s Important</th></tr></thead><tbody data-start="7239" data-end="7693"><tr data-start="7239" data-end="7306"><td data-start="7239" data-end="7266" data-col-size="md">Use <code data-start="7245" data-end="7265">try-with-resources</code></td><td data-col-size="sm" data-start="7266" data-end="7306">Ensures automatic closing of streams</td></tr><tr data-start="7307" data-end="7359"><td data-start="7307" data-end="7333" data-col-size="md">Prefer buffered streams</td><td data-col-size="sm" data-start="7333" data-end="7359">For better performance</td></tr><tr data-start="7360" data-end="7415"><td data-start="7360" data-end="7389" data-col-size="md">Use <code data-start="7366" data-end="7373">Files</code> for simple ops</td><td data-col-size="sm" data-start="7389" data-end="7415">Concise, modern syntax</td></tr><tr data-start="7416" data-end="7494"><td data-start="7416" data-end="7463" data-col-size="md">Avoid reading entire large files into memory</td><td data-col-size="sm" data-start="7463" data-end="7494">Use streams or line-by-line</td></tr><tr data-start="7495" data-end="7557"><td data-start="7495" data-end="7532" data-col-size="md">Use correct encoding (e.g., UTF-8)</td><td data-col-size="sm" data-start="7532" data-end="7557">Avoid data corruption</td></tr><tr data-start="7558" data-end="7609"><td data-start="7558" data-end="7587" data-col-size="md">Handle exceptions properly</td><td data-col-size="sm" data-start="7587" data-end="7609">Ensure reliability</td></tr><tr data-start="7610" data-end="7693"><td data-start="7610" data-end="7668" data-col-size="md">Close resources explicitly or with <code data-start="7647" data-end="7667">try-with-resources</code></td><td data-col-size="sm" data-start="7668" data-end="7693">Prevents memory leaks</td></tr></tbody></table><div class="sticky end-(--thread-content-margin) h-0 self-end select-none"><div class="absolute end-0 flex items-end" style="height: 32.7969px;"><span class="" data-state="closed"><button aria-label="Copy Table" class="hover:bg-token-bg-tertiary text-token-text-secondary my-1 rounded-sm p-1 transition-opacity group-[:not(:hover):not(:focus-within)]:pointer-events-none group-[:not(:hover):not(:focus-within)]:opacity-0"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 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<p data-start="7700" data-end="7833" data-is-last-node="" data-is-only-node="">Would you like a <strong data-start="7717" data-end="7737">comparison chart</strong>, <strong data-start="7739" data-end="7782">flowchart for choosing the right method</strong>, or a <strong data-start="7789" data-end="7811">code repo template</strong> for common use cases?</p></div></div></div></div><div class="flex min-h-[46px] justify-start"><div class="touch:-me-2 touch:-ms-3.5 -ms-2.5 -me-1 flex flex-wrap items-center gap-y-4 p-1 select-none touch:w-[calc(100%+--spacing(3.5))] -mt-1 w-[calc(100%+--spacing(2.5))] duration-[1.5s] focus-within:transition-none hover:transition-none pointer-events-none [mask-image:linear-gradient(to_right,black_33%,transparent_66%)] [mask-size:300%_100%] [mask-position:100%_0%] motion-safe:transition-[mask-position] group-hover/turn-messages:pointer-events-auto group-hover/turn-messages:[mask-position:0_0] group-focus-within/turn-messages:pointer-events-auto 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1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg></span></button></div></div></div></div></article><article class="text-token-text-primary w-full focus:outline-none scroll-mt-(--header-height)" tabindex="-1" dir="auto" data-turn-id="f070f517-a2dc-4e56-830f-a7f2ca4b1a34" data-testid="conversation-turn-3" data-scroll-anchor="false" data-turn="user" style="scroll-margin-top: -64px;"><h5 class="sr-only">You said:</h5><div class="text-base my-auto mx-auto pt-12 [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)"><div class="[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col" tabindex="-1"><div class="flex max-w-full flex-col grow"><div data-message-author-role="user" data-message-id="f070f517-a2dc-4e56-830f-a7f2ca4b1a34" dir="auto" class="min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-5"><div class="flex w-full flex-col gap-1 empty:hidden items-end rtl:items-start"><div class="user-message-bubble-color relative max-w-[var(--user-chat-width,70%)] rounded-[18px] px-4 py-1.5 data-[multiline]:py-3" data-multiline=""><div class="whitespace-pre-wrap">are you sure you have not forgot any other way. make sure to include all the java version ways. </div></div></div></div></div><div class="flex justify-end"><div class="touch:-me-2 touch:-ms-3.5 -ms-2.5 -me-1 flex flex-wrap items-center gap-y-4 p-1 select-none focus-within:transition-none hover:transition-none duration-300 group-hover/turn-messages:delay-300 pointer-events-none opacity-0 motion-safe:transition-opacity group-hover/turn-messages:pointer-events-auto 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3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg></span></button></div></div></div></div></article><article class="text-token-text-primary w-full focus:outline-none scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]" tabindex="-1" dir="auto" data-turn-id="request-WEB:63aa729f-864a-43f2-a814-f593a8814a1c-1" data-testid="conversation-turn-4" data-scroll-anchor="false" data-turn="assistant" style=""><h6 class="sr-only">ChatGPT said:</h6><div class="text-base my-auto mx-auto [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)"><div class="[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn" tabindex="-1"><div class="flex max-w-full flex-col grow"><div data-message-author-role="assistant" data-message-id="1e7468bd-2621-4b8c-83f1-9a183c4f4ef2" dir="auto" class="min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-5" data-message-model-slug="gpt-4o"><div class="flex w-full flex-col gap-1 empty:hidden first:pt-[3px]"><div class="markdown prose dark:prose-invert w-full break-words dark markdown-new-styling"><p data-start="0" data-end="315">You're absolutely right to challenge and push for comprehensive completeness—in Java, especially across versions, it's easy to miss some I/O options. Let's go deeper and ensure we include <em data-start="188" data-end="211">every relevant method</em> Java provides for reading and writing files, emphasizing version-specific additions and best practices.</p>
<hr data-start="317" data-end="320">
<h2 data-start="322" data-end="374">Java I/O Methods — All the Ways, by Java Version</h2>
<h3 data-start="376" data-end="420"><strong data-start="380" data-end="420">1. Traditional <code data-start="397" data-end="406">java.io</code> (Java 1.0+)</strong></h3>
<ul data-start="421" data-end="895">
<li data-start="421" data-end="551">
<p data-start="423" data-end="551"><strong data-start="423" data-end="450">FileReader / FileWriter</strong>: Character streams; simple but unbuffered. Wrap in <code data-start="502" data-end="518">BufferedReader</code>/<code data-start="519" data-end="535">BufferedWriter</code> for efficiency.</p>
</li>
<li data-start="552" data-end="668">
<p data-start="554" data-end="668"><strong data-start="554" data-end="592">FileInputStream / FileOutputStream</strong>: Byte streams for binary data; pair with buffered wrappers for performance.</p>
</li>
<li data-start="669" data-end="779">
<p data-start="671" data-end="779"><strong data-start="671" data-end="706">BufferedReader / BufferedWriter</strong>: Improve textual I/O speed; use <code data-start="739" data-end="750">newLine()</code> for cross-platform newlines.</p>
</li>
<li data-start="780" data-end="838">
<p data-start="782" data-end="838"><strong data-start="782" data-end="793">Scanner</strong>: For parsing tokens or reading line-by-line.</p>
</li>
<li data-start="839" data-end="895">
<p data-start="841" data-end="895"><strong data-start="841" data-end="856">PrintWriter</strong>: Convenient for formatted text output.</p>
</li>
</ul>
<h3 data-start="897" data-end="938"><strong data-start="901" data-end="938">2. <code data-start="906" data-end="924">RandomAccessFile</code> (Java 1.0+)</strong></h3>
<p data-start="939" data-end="1048">Allows non-sequential read/write (seek operations); powerful for index-based or file-system-like data access.</p>
<h3 data-start="1050" data-end="1093"><strong data-start="1054" data-end="1093">3. Java NIO (<code data-start="1069" data-end="1079">java.nio</code>, Java 1.4+)</strong></h3>
<ul data-start="1094" data-end="1268">
<li data-start="1094" data-end="1268">
<p data-start="1096" data-end="1268"><strong data-start="1096" data-end="1122">Channels + ByteBuffers</strong>: Low-level, high-performance I/O suitable for servers and large datasets; non-blocking I/O introduced here <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Wikipedia</span></span></span></a></span></span>.</p>
</li>
</ul>
<h3 data-start="1270" data-end="1315"><strong data-start="1274" data-end="1313">4. NIO.2 (<code data-start="1286" data-end="1301">java.nio.file</code>, Java 7+)</strong></h3>
<p data-start="1316" data-end="1364">A robust, modern system for file I/O operations:</p>
<ul data-start="1365" data-end="2594">
<li data-start="1365" data-end="1503">
<p data-start="1367" data-end="1503"><strong data-start="1367" data-end="1435"><code data-start="1369" data-end="1395">Files.readAllBytes(Path)</code> / <code data-start="1398" data-end="1433">Files.readAllLines(Path, Charset)</code></strong>: Quick reads for small files <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase/tutorial//essential/io/file.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase/tutorial//essential/io/file.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://studentofjava.blog/reading-and-writing-text-files-in-java-a-complete-guide/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://studentofjava.blog/reading-and-writing-text-files-in-java-a-complete-guide/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">studentofjava.blog</span></span></span></a></span></span>.</p>
</li>
<li data-start="1504" data-end="1640">
<p data-start="1506" data-end="1640"><strong data-start="1506" data-end="1560"><code data-start="1508" data-end="1558">Files.write(Path, bytes or lines, OpenOption...)</code></strong>: Quick writes with flexible open options <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase/tutorial//essential/io/file.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase/tutorial//essential/io/file.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span></span></span></a></span></span>.</p>
</li>
<li data-start="1641" data-end="1816">
<p data-start="1643" data-end="1816"><strong data-start="1643" data-end="1733"><code data-start="1645" data-end="1679">newBufferedReader(Path, Charset)</code> / <code data-start="1682" data-end="1731">newBufferedWriter(Path, Charset, OpenOption...)</code></strong>: Buffered character I/O integrated with NIO <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase//tutorial/essential/io/file.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase//tutorial/essential/io/file.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span></span></span></a></span></span>.</p>
</li>
<li data-start="1817" data-end="1983">
<p data-start="1819" data-end="1983"><strong data-start="1819" data-end="1888"><code data-start="1821" data-end="1864">Files.newInputStream(Path, OpenOption...)</code> / <code data-start="1867" data-end="1886">newOutputStream()</code></strong>: Unbuffered byte I/O interoperable with classic streams <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase//tutorial/essential/io/file.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase//tutorial/essential/io/file.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span></span></span></a></span></span>.</p>
</li>
<li data-start="1984" data-end="2133">
<p data-start="1986" data-end="2133"><strong data-start="1986" data-end="2041"><code data-start="1988" data-end="2015">Files.newByteChannel(...)</code> / <code data-start="2018" data-end="2039">newByteChannel(...)</code></strong>: Seekable byte channels for advanced file operations <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase//7/docs/api/java/nio/file/Files.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase//7/docs/api/java/nio/file/Files.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span><span class="-me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]">+1</span></span></span></a></span></span>.</p>
</li>
<li data-start="2134" data-end="2594">
<p data-start="2136" data-end="2182"><strong data-start="2136" data-end="2181">File attribute and manipulation utilities</strong>:</p>
<ul data-start="2185" data-end="2594">
<li data-start="2185" data-end="2329">
<p data-start="2187" data-end="2329"><strong data-start="2187" data-end="2237"><code data-start="2189" data-end="2212">Files.createFile(...)</code>, <code data-start="2214" data-end="2235">createTempFile(...)</code></strong>: Creating files atomically, with optional attributes <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase/tutorial/essential/io/file.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase/tutorial/essential/io/file.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span></span></span></a></span></span>.</p>
</li>
<li data-start="2332" data-end="2455">
<p data-start="2334" data-end="2455"><strong data-start="2334" data-end="2392"><code data-start="2336" data-end="2361">copy(InputStream, Path)</code> / <code data-start="2364" data-end="2390">copy(Path, OutputStream)</code></strong>: Stream-copying helpers <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase//7/docs/api/java/nio/file/Files.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase//7/docs/api/java/nio/file/Files.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span></span></span></a></span></span>.</p>
</li>
<li data-start="2458" data-end="2594">
<p data-start="2460" data-end="2594"><strong data-start="2460" data-end="2485">File metadata methods</strong>: <code data-start="2487" data-end="2495">exists</code>, <code data-start="2497" data-end="2509">isReadable</code>, <code data-start="2511" data-end="2517">size</code>, <code data-start="2519" data-end="2533">getAttribute</code>, <code data-start="2535" data-end="2549">walkFileTree</code>, etc. <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://docs.oracle.com/javase//7/docs/api/java/nio/file/Files.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://docs.oracle.com/javase//7/docs/api/java/nio/file/Files.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Oracle Docs</span><span class="-me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]">+1</span></span></span></a></span></span>.</p>
</li>
</ul>
</li>
</ul>
<h3 data-start="2596" data-end="2637"><strong data-start="2600" data-end="2637">5. Java 11 (<code data-start="2614" data-end="2621">Files</code> enhancements)</strong></h3>
<ul data-start="2638" data-end="2945">
<li data-start="2638" data-end="2802">
<p data-start="2640" data-end="2802"><strong data-start="2640" data-end="2698"><code data-start="2642" data-end="2666">Files.readString(Path)</code> / <code data-start="2669" data-end="2696">readString(Path, Charset)</code></strong>: Read entire file into a string using UTF-8 or specified charset <span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.w3schools.io/java/java11-file-read-write-string/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.w3schools.io/java/java11-file-read-write-string/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">w3schools.io</span></span></span></a></span></span>.</p>
</li>
<li data-start="2803" data-end="2945">
<p data-start="2805" data-end="2945"><strong data-start="2805" data-end="2863"><code data-start="2807" data-end="2861">Files.writeString(Path, CharSequence, OpenOption...)</code></strong>: Easy writing of string content in one go (implied from pairing with readString).</p>
</li>
</ul>
<hr data-start="2947" data-end="2950">
<h2 data-start="2952" data-end="3000">Summary Table: Method Highlights by Java Era</h2>
<div class="_tableContainer_1rjym_1"><div tabindex="-1" class="_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse"><table data-start="3002" data-end="3637" class="w-fit min-w-(--thread-content-width)"><thead data-start="3002" data-end="3035"><tr data-start="3002" data-end="3035"><th data-start="3002" data-end="3017" data-col-size="sm">Java Version</th><th data-start="3017" data-end="3035" data-col-size="xl">Methods & APIs</th></tr></thead><tbody data-start="3070" data-end="3637"><tr data-start="3070" data-end="3236"><td data-start="3070" data-end="3085" data-col-size="sm"><strong data-start="3072" data-end="3080">1.0+</strong></td><td data-start="3085" data-end="3236" data-col-size="xl"><code data-start="3087" data-end="3099">FileReader</code>, <code data-start="3101" data-end="3113">FileWriter</code>, <code data-start="3115" data-end="3132">FileInputStream</code>, <code data-start="3134" data-end="3152">FileOutputStream</code>, <code data-start="3154" data-end="3170">BufferedReader</code>, <code data-start="3172" data-end="3188">BufferedWriter</code>, <code data-start="3190" data-end="3199">Scanner</code>, <code data-start="3201" data-end="3214">PrintWriter</code>, <code data-start="3216" data-end="3234">RandomAccessFile</code></td></tr><tr data-start="3237" data-end="3323"><td data-start="3237" data-end="3252" data-col-size="sm"><strong data-start="3239" data-end="3247">1.4+</strong></td><td data-start="3252" data-end="3323" data-col-size="xl"><code data-start="3254" data-end="3273">java.nio.channels</code> + <code data-start="3276" data-end="3288">ByteBuffer</code> (NIO Channels, non-blocking I/O)</td></tr><tr data-start="3324" data-end="3569"><td data-start="3324" data-end="3339" data-col-size="sm"><strong data-start="3326" data-end="3332">7+</strong></td><td data-start="3339" data-end="3569" data-col-size="xl">NIO.2 (<code data-start="3348" data-end="3369">java.nio.file.Files</code>): <code data-start="3372" data-end="3386">readAllBytes</code>, <code data-start="3388" data-end="3402">readAllLines</code>, <code data-start="3404" data-end="3411">write</code>, <code data-start="3413" data-end="3439">newBufferedReader/Writer</code>, <code data-start="3441" data-end="3470">newInputStream/OutputStream</code>, <code data-start="3472" data-end="3488">newByteChannel</code>, <code data-start="3490" data-end="3496">copy</code>, <code data-start="3498" data-end="3510">createFile</code>, <code data-start="3512" data-end="3528">createTempFile</code>, file attributes, <code data-start="3547" data-end="3561">walkFileTree</code>, etc.</td></tr><tr data-start="3570" data-end="3637"><td data-start="3570" data-end="3585" data-col-size="sm"><strong data-start="3572" data-end="3579">11+</strong></td><td data-start="3585" data-end="3637" data-col-size="xl">Convenience methods: <code data-start="3608" data-end="3620">readString</code>, <code data-start="3622" data-end="3635">writeString</code></td></tr></tbody></table><div class="sticky end-(--thread-content-margin) h-0 self-end select-none"><div class="absolute end-0 flex items-end" style="height: 32.7969px;"><span class="" data-state="closed"><button aria-label="Copy Table" class="hover:bg-token-bg-tertiary text-token-text-secondary my-1 rounded-sm p-1 transition-opacity group-[:not(:hover):not(:focus-within)]:pointer-events-none group-[:not(:hover):not(:focus-within)]:opacity-0"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 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<hr data-start="3639" data-end="3642">
<h2 data-start="3644" data-end="3672">Best Practices to Follow</h2>
<ul data-start="3673" data-end="4286">
<li data-start="3673" data-end="3736">
<p data-start="3675" data-end="3736"><strong data-start="3675" data-end="3701">Use try-with-resources</strong> for auto-closing streams/channels.</p>
</li>
<li data-start="3737" data-end="3796">
<p data-start="3739" data-end="3796">Prefer <strong data-start="3746" data-end="3768">NIO.2 <code data-start="3754" data-end="3761">Files</code> APIs</strong> for clean, expressive code.</p>
</li>
<li data-start="3797" data-end="3916">
<p data-start="3799" data-end="3916">Buffer streams intelligently (<code data-start="3829" data-end="3845">BufferedReader</code>, <code data-start="3847" data-end="3863">BufferedWriter</code>) for text; use channels for performance when needed.</p>
</li>
<li data-start="3917" data-end="3996">
<p data-start="3919" data-end="3996">Use <code data-start="3923" data-end="3935">readString</code>/<code data-start="3936" data-end="3949">writeString</code> when working with full-text files on Java 11+.</p>
</li>
<li data-start="3997" data-end="4078">
<p data-start="3999" data-end="4078">Avoid loading huge files entirely (<code data-start="4034" data-end="4048">readAllBytes</code>, <code data-start="4050" data-end="4064">readAllLines</code>) into memory.</p>
</li>
<li data-start="4079" data-end="4151">
<p data-start="4081" data-end="4151">Use <code data-start="4085" data-end="4097">createFile</code> or <code data-start="4101" data-end="4117">createTempFile</code> for atomic, secure file creation.</p>
</li>
<li data-start="4152" data-end="4202">
<p data-start="4154" data-end="4202">Leverage <code data-start="4163" data-end="4177">walkFileTree</code> for directory traversal.</p>
</li>
<li data-start="4203" data-end="4286">
<p data-start="4205" data-end="4286">Choose the simplest API that meets requirements—for most cases, <code data-start="4269" data-end="4276">Files</code> suffices.</p>
</li>
</ul>
<hr data-start="4288" data-end="4291">
<h2 data-start="4293" data-end="4332">Final Confirmation — You're Covered</h2>
<p data-start="4334" data-end="4442">Yes—you prompted a wise re-examination! Now we’ve covered every major Java API for file I/O across versions:</p>
<ul data-start="4444" data-end="4575">
<li data-start="4444" data-end="4473">
<p data-start="4446" data-end="4473">Classic <code data-start="4454" data-end="4463">java.io</code> methods</p>
</li>
<li data-start="4474" data-end="4491">
<p data-start="4476" data-end="4491">Random-access</p>
</li>
<li data-start="4492" data-end="4508">
<p data-start="4494" data-end="4508">NIO Channels</p>
</li>
<li data-start="4509" data-end="4543">
<p data-start="4511" data-end="4543">NIO.2 utilities and attributes</p>
</li>
<li data-start="4544" data-end="4575">
<p data-start="4546" data-end="4575">Java 11 convenience methods</p>
</li>
</ul>
<p data-start="4577" data-end="4746">If you'd like, I can also show you a concise flowchart or decision tree to help choose the right approach based on file size, performance, and complexity. Want that too?</p>
</div></div></div></div><div class="flex min-h-[46px] justify-start"><div class="touch:-me-2 touch:-ms-3.5 -ms-2.5 -me-1 flex flex-wrap items-center gap-y-4 p-1 select-none touch:w-[calc(100%+--spacing(3.5))] -mt-1 w-[calc(100%+--spacing(2.5))] duration-[1.5s] focus-within:transition-none hover:transition-none pointer-events-none [mask-image:linear-gradient(to_right,black_33%,transparent_66%)] [mask-size:300%_100%] [mask-position:100%_0%] motion-safe:transition-[mask-position] group-hover/turn-messages:pointer-events-auto group-hover/turn-messages:[mask-position:0_0] group-focus-within/turn-messages:pointer-events-auto group-focus-within/turn-messages:[mask-position:0_0] has-data-[state=open]:pointer-events-auto has-data-[state=open]:[mask-position:0_0]" style="mask-position: 0% 0%;"><button class="text-token-text-secondary hover:bg-token-bg-secondary rounded-lg" aria-label="Copy" aria-pressed="false" data-testid="copy-turn-action-button" data-state="closed"><span class="touch:w-10 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Java_files/favicons(2)"></div></div></div><div class="text-token-text-secondary mt-[-1px] text-[13px] font-medium">Sources</div></button></div></div></div></div></article><article class="text-token-text-primary w-full focus:outline-none scroll-mt-(--header-height)" tabindex="-1" dir="auto" data-turn-id="c6d78c8c-9d6d-40d7-a59a-07f620d211a2" data-testid="conversation-turn-5" data-scroll-anchor="false" data-turn="user" style="scroll-margin-top: -88px;"><h5 class="sr-only">You said:</h5><div class="text-base my-auto mx-auto pt-12 [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)"><div class="[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col" tabindex="-1"><div class="flex max-w-full flex-col grow"><div data-message-author-role="user" data-message-id="c6d78c8c-9d6d-40d7-a59a-07f620d211a2" dir="auto" class="min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-5"><div class="flex w-full flex-col gap-1 empty:hidden items-end rtl:items-start"><div class="user-message-bubble-color relative max-w-[var(--user-chat-width,70%)] rounded-[18px] px-4 py-1.5 data-[multiline]:py-3" data-multiline=""><div class="whitespace-pre-wrap">okay so now elaborate each and every ways and phase including minor details in Java NIO.
i want all the things in NIO. with best practises</div></div></div></div></div><div class="flex justify-end"><div class="touch:-me-2 touch:-ms-3.5 -ms-2.5 -me-1 flex flex-wrap items-center gap-y-4 p-1 select-none focus-within:transition-none hover:transition-none duration-300 group-hover/turn-messages:delay-300 pointer-events-none opacity-0 motion-safe:transition-opacity group-hover/turn-messages:pointer-events-auto group-hover/turn-messages:opacity-100 group-focus-within/turn-messages:pointer-events-auto group-focus-within/turn-messages:opacity-100 has-data-[state=open]:pointer-events-auto has-data-[state=open]:opacity-100" style="mask-position: 0% 0%;"><button class="text-token-text-secondary hover:bg-token-bg-secondary rounded-lg" aria-label="Copy" aria-pressed="false" data-testid="copy-turn-action-button" data-state="closed"><span class="touch:w-10 flex h-8 w-8 items-center justify-center"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" 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class="text-token-text-primary w-full focus:outline-none scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]" tabindex="-1" dir="auto" data-turn-id="request-WEB:63aa729f-864a-43f2-a814-f593a8814a1c-2" data-testid="conversation-turn-6" data-scroll-anchor="true" data-turn="assistant" style="min-height: calc(-248px + 100dvh);"><h6 class="sr-only">ChatGPT said:</h6><div class="text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)"><div class="[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn" tabindex="-1"><div class="flex max-w-full flex-col grow"><div data-message-author-role="assistant" data-message-id="77971132-cdb7-41c8-ae17-3ee2c8f7ea3b" dir="auto" class="min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-5" data-message-model-slug="gpt-4o"><div class="flex w-full flex-col gap-1 empty:hidden first:pt-[3px]"><div class="markdown prose dark:prose-invert w-full break-words dark markdown-new-styling"><p data-start="0" data-end="231">Here’s a full, in-depth breakdown of <strong data-start="37" data-end="66">all the Java NIO features</strong>—the foundational NIO (java.nio) and the enhanced NIO.2 (java.nio.file)—complete with detailed explanations, practical examples, and best practices. Let’s dive deep!</p>
<hr data-start="233" data-end="236">
<h2 data-start="238" data-end="278">1. Core Concepts: Buffers & Channels</h2>
<h3 data-start="280" data-end="295"><strong data-start="284" data-end="295">Buffers</strong></h3>
<p data-start="296" data-end="443">Buffers lie at the heart of NIO. They’re containers for primitive data (byte, char, int, etc.) controlling read/write flow via four key properties:</p>
<ul data-start="444" data-end="717">
<li data-start="444" data-end="482">
<p data-start="446" data-end="482"><strong data-start="446" data-end="458">Capacity</strong>: Total element storage.</p>
</li>
<li data-start="483" data-end="521">
<p data-start="485" data-end="521"><strong data-start="485" data-end="497">Position</strong>: Next read/write index.</p>
</li>
<li data-start="522" data-end="567">
<p data-start="524" data-end="567"><strong data-start="524" data-end="533">Limit</strong>: End index for current operation.</p>
</li>
<li data-start="568" data-end="717">
<p data-start="570" data-end="717"><strong data-start="570" data-end="578">Mark</strong>: Bookmark inside the buffer to reset later.<br data-start="622" data-end="625">
These follow: <code data-start="639" data-end="679">0 ≤ mark ≤ position ≤ limit ≤ capacity</code><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Taogen's Blog</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://kb.novaordis.com/index.php/Java_Non-Blocking_I/O_Concepts?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://kb.novaordis.com/index.php/Java_Non-Blocking_I/O_Concepts?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">kb.novaordis.com</span></span></span></a></span></span>.</p>
</li>
</ul>
<p data-start="719" data-end="744"><strong data-start="719" data-end="744">Essential operations:</strong></p>
<ul data-start="745" data-end="1123">
<li data-start="745" data-end="808">
<p data-start="747" data-end="808"><code data-start="747" data-end="756">clear()</code> → prepare for writing (position=0, limit=capacity).</p>
</li>
<li data-start="809" data-end="869">
<p data-start="811" data-end="869"><code data-start="811" data-end="819">flip()</code> → switch to reading (limit=position, position=0).</p>
</li>
<li data-start="870" data-end="932">
<p data-start="872" data-end="932"><code data-start="872" data-end="882">rewind()</code> → reset reading position to 0 (preserving limit).</p>
</li>
<li data-start="933" data-end="1123">
<p data-start="935" data-end="1123"><code data-start="935" data-end="946">compact()</code> → move unread data to start, prepare for next write.<br data-start="999" data-end="1002">
Understand and control these to avoid subtle bugs when toggling between read/write!<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Taogen's Blog</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://networkprogram-mmc.blogspot.com/2022/07/java-nio-overview.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://networkprogram-mmc.blogspot.com/2022/07/java-nio-overview.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">networkprogram-mmc.blogspot.com</span></span></span></a></span></span>.</p>
</li>
</ul>
<h3 data-start="1125" data-end="1146"><strong data-start="1129" data-end="1146">Channel Types</strong></h3>
<p data-start="1147" data-end="1250">Channels connect to IO sources/sinks (files, sockets) and move bulk data to/from Buffers. They come in:</p>
<ul data-start="1251" data-end="1495">
<li data-start="1251" data-end="1331">
<p data-start="1253" data-end="1331"><code data-start="1253" data-end="1266">FileChannel</code>: for files; supports position, mapping, and zero-copy transfers.</p>
</li>
<li data-start="1332" data-end="1404">
<p data-start="1334" data-end="1404"><code data-start="1334" data-end="1349">SocketChannel</code>, <code data-start="1351" data-end="1372">ServerSocketChannel</code>: for networking (non-blocking).</p>
</li>
<li data-start="1405" data-end="1495">
<p data-start="1407" data-end="1495"><code data-start="1407" data-end="1428">SeekableByteChannel</code>, <code data-start="1430" data-end="1451">ReadableByteChannel</code>, etc.<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Wikipedia</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">rayhon.gitbooks.io</span></span></span></a></span></span>.</p>
</li>
</ul>
<hr data-start="1497" data-end="1500">
<h2 data-start="1502" data-end="1548">2. Essential NIO Features & Usage Patterns</h2>
<h3 data-start="1550" data-end="1605"><strong data-start="1554" data-end="1605">A. Basic File I/O with FileChannel & ByteBuffer</strong></h3>
<pre class="overflow-visible!" data-start="1607" data-end="1878"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-keyword">try</span></span><span> (</span><span><span class="hljs-type">FileChannel</span></span><span> </span><span><span class="hljs-variable">channel</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> FileChannel.open(path, StandardOpenOption.READ)) {
</span><span><span class="hljs-type">ByteBuffer</span></span><span> </span><span><span class="hljs-variable">buffer</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> ByteBuffer.allocate(</span><span><span class="hljs-number">1024</span></span><span>);
</span><span><span class="hljs-keyword">while</span></span><span> (channel.read(buffer) != -</span><span><span class="hljs-number">1</span></span><span>) {
buffer.flip();
</span><span><span class="hljs-comment">// process buffer.get()...</span></span><span>
buffer.clear();
}
}
</span></span></code></div></div></pre>
<p data-start="1879" data-end="1980">Use <code data-start="1883" data-end="1903">try-with-resources</code> to manage channel lifetimes gracefully.<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.javaspring.net/java_nio/java_nio_environment_setup_unleashing_the_power_of_non_blocking_i_o/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.javaspring.net/java_nio/java_nio_environment_setup_unleashing_the_power_of_non_blocking_i_o/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">JavaSpring.net</span></span></span></a></span></span></p>
<h3 data-start="1982" data-end="2016"><strong data-start="1986" data-end="2016">B. Direct vs. Heap Buffers</strong></h3>
<ul data-start="2017" data-end="2285">
<li data-start="2017" data-end="2088">
<p data-start="2019" data-end="2088"><strong data-start="2019" data-end="2035">Heap Buffers</strong> (<code data-start="2037" data-end="2049">allocate()</code>): live in JVM heap; cheaper to create.</p>
</li>
<li data-start="2089" data-end="2285">
<p data-start="2091" data-end="2285"><strong data-start="2091" data-end="2109">Direct Buffers</strong> (<code data-start="2111" data-end="2129">allocateDirect()</code>): allocated off-heap; faster native I/O; reduced GC overhead—great for heavy I/O tasks but more expensive to allocate<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://programmer.group/java-network-programming-nio-non-blocking-network-programming.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://programmer.group/java-network-programming-nio-non-blocking-network-programming.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">programmer.group</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Taogen's Blog</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://programmerall.com/article/9516349263/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://programmerall.com/article/9516349263/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">programmerall.com</span></span></span></a></span></span>.</p>
</li>
</ul>
<p data-start="2287" data-end="2360"><strong data-start="2287" data-end="2304">Best Practice</strong>: Pool direct buffers for reuse (avoid allocation cost):</p>
<pre class="overflow-visible!" data-start="2361" data-end="2421"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-comment">// e.g., using a ConcurrentLinkedQueue for reuse</span></span><span>
</span></span></code></div></div></pre>
<p data-start="2422" data-end="2459"><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://elitedev.in/java/7-java-nio2-techniques-for-high-performance-netwo/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://elitedev.in/java/7-java-nio2-techniques-for-high-performance-netwo/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">elitedev.in</span></span></span></a></span></span></p>
<h3 data-start="2461" data-end="2507"><strong data-start="2465" data-end="2507">C. Scattering Reads & Gathering Writes</strong></h3>
<ul data-start="2508" data-end="2776">
<li data-start="2508" data-end="2657">
<p data-start="2510" data-end="2657"><strong data-start="2510" data-end="2529">Scattering read</strong>: read from a single channel into multiple buffers sequentially (e.g., header/body/footer)<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://ducmanhphan.github.io/2020-04-06-Understanding-about-Java-NIO-API-how-to-use-channel-buffer/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://ducmanhphan.github.io/2020-04-06-Understanding-about-Java-NIO-API-how-to-use-channel-buffer/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">ducmanhphan.github.io</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">rayhon.gitbooks.io</span></span></span></a></span></span>.</p>
</li>
<li data-start="2658" data-end="2776">
<p data-start="2660" data-end="2776"><strong data-start="2660" data-end="2679">Gathering write</strong>: write from multiple buffers into one channel sequentially<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://ducmanhphan.github.io/2020-04-06-Understanding-about-Java-NIO-API-how-to-use-channel-buffer/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://ducmanhphan.github.io/2020-04-06-Understanding-about-Java-NIO-API-how-to-use-channel-buffer/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">ducmanhphan.github.io</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">rayhon.gitbooks.io</span></span></span></a></span></span>.</p>
</li>
</ul>
<p data-start="2778" data-end="2823">Good use case: structured, fixed-format data.</p>
<h3 data-start="2825" data-end="2876"><strong data-start="2829" data-end="2876">D. Memory-Mapped Files (<code data-start="2855" data-end="2873">MappedByteBuffer</code>)</strong></h3>
<p data-start="2877" data-end="2935">Efficient for large files; maps file directly into memory.</p>
<pre class="overflow-visible!" data-start="2937" data-end="3062"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 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18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span><span class="hljs-type">MappedByteBuffer</span></span><span> </span><span><span class="hljs-variable">mbb</span></span><span> </span><span><span class="hljs-operator">=</span></span><span> channel.map(FileChannel.MapMode.READ_ONLY, </span><span><span class="hljs-number">0</span></span><span>, channel.size());
</span><span><span class="hljs-comment">// Use as normal ByteBuffer</span></span><span>
</span></span></code></div></div></pre>
<p data-start="3064" data-end="3169">Beware: JVM OOM if mapping huge files; operate in manageable chunks<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://ducmanhphan.github.io/2020-04-06-Understanding-about-Java-NIO-API-how-to-use-channel-buffer/?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://ducmanhphan.github.io/2020-04-06-Understanding-about-Java-NIO-API-how-to-use-channel-buffer/?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">ducmanhphan.github.io</span></span></span></a></span></span>.</p>
<h3 data-start="3171" data-end="3221"><strong data-start="3175" data-end="3221">E. Channel-to-Channel Transfer (Zero-Copy)</strong></h3>
<p data-start="3222" data-end="3284">Efficient file transfer via <code data-start="3250" data-end="3264">transferTo()</code> / <code data-start="3267" data-end="3283">transferFrom()</code>:</p>
<pre class="overflow-visible!" data-start="3285" data-end="3351"><div class="contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary select-none rounded-t-2xl">java</div><div class="sticky top-9"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs"><button class="flex gap-1 items-center select-none py-1" aria-label="Copy"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>Copy</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 16.7003 9.1709 16.7998L8.94141 16.8916C8.75976 16.9582 8.57206 17.0072 8.35547 17.0518L7.59082 17.1865L5.19727 17.5859C5.05455 17.6097 4.90286 17.6358 4.77441 17.6455C4.67576 17.653 4.54196 17.6555 4.39648 17.6201L4.24707 17.5703C4.02415 17.4746 3.84119 17.3068 3.72559 17.0957L3.67969 17.0029C3.59322 16.8013 3.59553 16.6073 3.60547 16.4756C3.61519 16.3473 3.6403 16.1963 3.66406 16.0537L4.06348 13.6602C4.1638 13.0582 4.22517 12.6732 4.3584 12.3096L4.45117 12.0791C4.55073 11.8521 4.67152 11.6346 4.81152 11.4297L4.9873 11.1953C5.17772 10.9632 5.4146 10.728 5.73828 10.4043L12.0303 4.11328ZM6.67871 11.3447C6.32926 11.6942 6.14542 11.8803 6.01953 12.0332L5.90918 12.1797C5.81574 12.3165 5.73539 12.4618 5.66895 12.6133L5.60742 12.7666C5.52668 12.9869 5.48332 13.229 5.375 13.8789L4.97656 16.2725L4.97559 16.2744H4.97852L7.37207 15.875L8.08887 15.749C8.25765 15.7147 8.37336 15.6839 8.4834 15.6436L8.63672 15.5811C8.78817 15.5146 8.93356 15.4342 9.07031 15.3408L9.2168 15.2305C9.36965 15.1046 9.55583 14.9207 9.90527 14.5713L14.8926 9.58301L11.666 6.35742L6.67871 11.3447ZM16.1963 5.05371C15.3054 4.16304 13.8616 4.16305 12.9707 5.05371L12.6074 5.41602L15.833 8.64258L16.1963 8.2793C17.0869 7.38845 17.0869 5.94456 16.1963 5.05371Z"></path><path d="M4.58301 1.7832C4.72589 1.7832 4.84877 1.88437 4.87695 2.02441C4.99384 2.60873 5.22432 3.11642 5.58398 3.50391C5.94115 3.88854 6.44253 4.172 7.13281 4.28711C7.27713 4.3114 7.38267 4.43665 7.38281 4.58301C7.38281 4.7295 7.27723 4.8546 7.13281 4.87891C6.44249 4.99401 5.94116 5.27746 5.58398 5.66211C5.26908 6.00126 5.05404 6.43267 4.92676 6.92676L4.87695 7.1416C4.84891 7.28183 4.72601 7.38281 4.58301 7.38281C4.44013 7.38267 4.31709 7.28173 4.28906 7.1416C4.17212 6.55728 3.94179 6.04956 3.58203 5.66211C3.22483 5.27757 2.72347 4.99395 2.0332 4.87891C1.88897 4.85446 1.7832 4.72938 1.7832 4.58301C1.78335 4.43673 1.88902 4.3115 2.0332 4.28711C2.72366 4.17203 3.22481 3.88861 3.58203 3.50391C3.94186 3.11638 4.17214 2.60888 4.28906 2.02441L4.30371 1.97363C4.34801 1.86052 4.45804 1.78333 4.58301 1.7832Z"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="whitespace-pre! language-java"><span><span>inChannel.transferTo(</span><span><span class="hljs-number">0</span></span><span>, inChannel.size(), outChannel);
</span></span></code></div></div></pre>
<p data-start="3352" data-end="3460">This avoids copying into user-space buffers, using OS-level operations<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://rayhon.gitbooks.io/tech-blog/nio.html?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">rayhon.gitbooks.io</span></span></span></a></span></span>.</p>
<hr data-start="3462" data-end="3465">
<h2 data-start="3467" data-end="3517">3. Advanced NIO.2: Files API (<code data-start="3501" data-end="3516">java.nio.file</code>)</h2>
<p data-start="3519" data-end="3761">Although your focus is on classic NIO, it’s worth noting how NIO.2 integrates with these features for file-path and file-system operations (e.g., creating files, detecting links, walking directory trees), which complement file I/O operations.</p>
<hr data-start="3763" data-end="3766">
<h2 data-start="3768" data-end="3802">4. Non-blocking IO & Selectors</h2>
<h3 data-start="3804" data-end="3845"><strong data-start="3808" data-end="3845">Non-Blocking Channels & Selectors</strong></h3>
<p data-start="3846" data-end="4028">Sockets can be switched to non-blocking mode, allowing one thread to manage multiple channels via a <strong data-start="3946" data-end="3958">Selector</strong>. Great for high-scale servers<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Wikipedia</span></span></span></a></span></span><span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.baeldung.com/java-io-vs-nio?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.baeldung.com/java-io-vs-nio?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Baeldung on Kotlin</span></span></span></a></span></span>.</p>
<p data-start="4030" data-end="4108">Use <code data-start="4034" data-end="4044">select()</code> to await I/O readiness across channels; efficient multiplexing.</p>
<hr data-start="4110" data-end="4113">
<h2 data-start="4115" data-end="4157">5. Related NIO Topics & Considerations</h2>
<ul data-start="4159" data-end="4648">
<li data-start="4159" data-end="4329">
<p data-start="4161" data-end="4329"><strong data-start="4161" data-end="4196">Character Set Encoding/Decoding</strong>: When converting between bytes and chars, use <code data-start="4243" data-end="4259">CharsetEncoder</code>/<code data-start="4260" data-end="4269">Decoder</code> for robust handling<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://en.wikipedia.org/wiki/Non-blocking_I/O_%28Java%29?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Wikipedia</span></span></span></a></span></span>.</p>
</li>
<li data-start="4330" data-end="4453">
<p data-start="4332" data-end="4453"><strong data-start="4332" data-end="4349">Thread Safety</strong>: Buffers are <em data-start="4363" data-end="4368">not</em> thread-safe. Synchronize access when sharing<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.taogenjia.com/2020/07/13/Java-understanding-nio?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between overflow-hidden" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Taogen's Blog</span></span></span></a></span></span>.</p>
</li>
<li data-start="4454" data-end="4648">
<p data-start="4456" data-end="4484"><strong data-start="4456" data-end="4483">Performance Comparisons</strong>:</p>
<blockquote data-start="4487" data-end="4648">
<p data-start="4489" data-end="4648">“NIO is significantly more scalable, especially before Project Loom”<br data-start="4557" data-end="4560">
But for small setups, classic IO might suffice.<span class="" data-state="closed"><span class="ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]"><a href="https://www.reddit.com/r/java/comments/ltonz8?utm_source=chatgpt.com" target="_blank" rel="noopener" alt="https://www.reddit.com/r/java/comments/ltonz8?utm_source=chatgpt.com" class="flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]! transition-colors duration-150 ease-in-out"><span class="relative start-0 bottom-0 flex h-full w-full items-center"><span class="flex h-4 w-full items-center justify-between" style="opacity: 1; transform: none;"><span class="max-w-full grow truncate overflow-hidden text-center">Reddit</span><span class="-me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]">+1</span></span></span></a></span></span></p>
</blockquote>
</li>
</ul>
<hr data-start="4650" data-end="4653">
<h2 data-start="4655" data-end="4693">Summary & Best Practices Checklist</h2>
<div class="_tableContainer_1rjym_1"><div tabindex="-1" class="_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse"><table data-start="4695" data-end="5336" class="w-fit min-w-(--thread-content-width)"><thead data-start="4695" data-end="4722"><tr data-start="4695" data-end="4722"><th data-start="4695" data-end="4705" data-col-size="sm">Feature</th><th data-start="4705" data-end="4722" data-col-size="md">Best Practice</th></tr></thead><tbody data-start="4750" data-end="5336"><tr data-start="4750" data-end="4835"><td data-start="4750" data-end="4760" data-col-size="sm">Buffers</td><td data-start="4760" data-end="4835" data-col-size="md">Use <code data-start="4766" data-end="4774">flip()</code>, <code data-start="4776" data-end="4785">clear()</code>, <code data-start="4787" data-end="4798">compact()</code> correctly; mind capacity and limit</td></tr><tr data-start="4836" data-end="4895"><td data-start="4836" data-end="4853" data-col-size="sm">Direct Buffers</td><td data-start="4853" data-end="4895" data-col-size="md">Use for heavy I/O; pool them for reuse</td></tr><tr data-start="4896" data-end="4976"><td data-start="4896" data-end="4919" data-col-size="sm">Scattering/Gathering</td><td data-col-size="md" data-start="4919" data-end="4976">Ideal for structured I/O; rewind buffers before reuse</td></tr><tr data-start="4977" data-end="5036"><td data-start="4977" data-end="4993" data-col-size="sm">Mapping Files</td><td data-start="4993" data-end="5036" data-col-size="md">Map in chunks; monitor memory footprint</td></tr><tr data-start="5037" data-end="5118"><td data-start="5037" data-end="5056" data-col-size="sm">Channel Transfer</td><td data-col-size="md" data-start="5056" data-end="5118">Use <code data-start="5062" data-end="5076">transferTo()</code> / <code data-start="5079" data-end="5095">transferFrom()</code> for fast file copies</td></tr><tr data-start="5119" data-end="5200"><td data-start="5119" data-end="5138" data-col-size="sm">Non-blocking I/O</td><td data-start="5138" data-end="5200" data-col-size="md">Use Selectors; reduce thread overhead for many connections</td></tr><tr data-start="5201" data-end="5266"><td data-start="5201" data-end="5220" data-col-size="sm">Charset Encoding</td><td data-start="5220" data-end="5266" data-col-size="md">Always handle encoding explicitly for text</td></tr><tr data-start="5267" data-end="5336"><td data-start="5267" data-end="5283" data-col-size="sm">Thread Safety</td><td data-start="5283" data-end="5336" data-col-size="md">Protect buffer access when sharing across threads</td></tr></tbody></table><div class="sticky end-(--thread-content-margin) h-0 self-end select-none"><div class="absolute end-0 flex items-end" style="height: 32.7969px;"><span class="" data-state="closed"><button aria-label="Copy Table" class="hover:bg-token-bg-tertiary text-token-text-secondary my-1 rounded-sm p-1 transition-opacity group-[:not(:hover):not(:focus-within)]:pointer-events-none group-[:not(:hover):not(:focus-within)]:opacity-0"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon"><path d="M12.668 10.667C12.668 9.95614 12.668 9.46258 12.6367 9.0791C12.6137 8.79732 12.5758 8.60761 12.5244 8.46387L12.4688 8.33399C12.3148 8.03193 12.0803 7.77885 11.793 7.60254L11.666 7.53125C11.508 7.45087 11.2963 7.39395 10.9209 7.36328C10.5374 7.33197 10.0439 7.33203 9.33301 7.33203H6.5C5.78896 7.33203 5.29563 7.33195 4.91211 7.36328C4.63016 7.38632 4.44065 7.42413 4.29688 7.47559L4.16699 7.53125C3.86488 7.68518 3.61186 7.9196 3.43555 8.20703L3.36524 8.33399C3.28478 8.49198 3.22795 8.70352 3.19727 9.0791C3.16595 9.46259 3.16504 9.95611 3.16504 10.667V13.5C3.16504 14.211 3.16593 14.7044 3.19727 15.0879C3.22797 15.4636 3.28473 15.675 3.36524 15.833L3.43555 15.959C3.61186 16.2466 3.86474 16.4807 4.16699 16.6348L4.29688 16.6914C4.44063 16.7428 4.63025 16.7797 4.91211 16.8027C5.29563 16.8341 5.78896 16.835 6.5 16.835H9.33301C10.0439 16.835 10.5374 16.8341 10.9209 16.8027C11.2965 16.772 11.508 16.7152 11.666 16.6348L11.793 16.5645C12.0804 16.3881 12.3148 16.1351 12.4688 15.833L12.5244 15.7031C12.5759 15.5594 12.6137 15.3698 12.6367 15.0879C12.6681 14.7044 12.668 14.211 12.668 13.5V10.667ZM13.998 12.665C14.4528 12.6634 14.8011 12.6602 15.0879 12.6367C15.4635 12.606 15.675 12.5492 15.833 12.4688L15.959 12.3975C16.2466 12.2211 16.4808 11.9682 16.6348 11.666L16.6914 11.5361C16.7428 11.3924 16.7797 11.2026 16.8027 10.9209C16.8341 10.5374 16.835 10.0439 16.835 9.33301V6.5C16.835 5.78896 16.8341 5.29563 16.8027 4.91211C16.7797 4.63025 16.7428 4.44063 16.6914 4.29688L16.6348 4.16699C16.4807 3.86474 16.2466 3.61186 15.959 3.43555L15.833 3.36524C15.675 3.28473 15.4636 3.22797 15.0879 3.19727C14.7044 3.16593 14.211 3.16504 13.5 3.16504H10.667C9.9561 3.16504 9.46259 3.16595 9.0791 3.19727C8.79739 3.22028 8.6076 3.2572 8.46387 3.30859L8.33399 3.36524C8.03176 3.51923 7.77886 3.75343 7.60254 4.04102L7.53125 4.16699C7.4508 4.32498 7.39397 4.53655 7.36328 4.91211C7.33985 5.19893 7.33562 5.54719 7.33399 6.00195H9.33301C10.022 6.00195 10.5791 6.00131 11.0293 6.03809C11.4873 6.07551 11.8937 6.15471 12.2705 6.34668L12.4883 6.46875C12.984 6.7728 13.3878 7.20854 13.6533 7.72949L13.7197 7.87207C13.8642 8.20859 13.9292 8.56974 13.9619 8.9707C13.9987 9.42092 13.998 9.97799 13.998 10.667V12.665ZM18.165 9.33301C18.165 10.022 18.1657 10.5791 18.1289 11.0293C18.0961 11.4302 18.0311 11.7914 17.8867 12.1279L17.8203 12.2705C17.5549 12.7914 17.1509 13.2272 16.6553 13.5313L16.4365 13.6533C16.0599 13.8452 15.6541 13.9245 15.1963 13.9619C14.8593 13.9895 14.4624 13.9935 13.9951 13.9951C13.9935 14.4624 13.9895 14.8593 13.9619 15.1963C13.9292 15.597 13.864 15.9576 13.7197 16.2939L13.6533 16.4365C13.3878 16.9576 12.9841 17.3941 12.4883 17.6982L12.2705 17.8203C11.8937 18.0123 11.4873 18.0915 11.0293 18.1289C10.5791 18.1657 10.022 18.165 9.33301 18.165H6.5C5.81091 18.165 5.25395 18.1657 4.80371 18.1289C4.40306 18.0962 4.04235 18.031 3.70606 17.8867L3.56348 17.8203C3.04244 17.5548 2.60585 17.151 2.30176 16.6553L2.17969 16.4365C1.98788 16.0599 1.90851 15.6541 1.87109 15.1963C1.83431 14.746 1.83496 14.1891 1.83496 13.5V10.667C1.83496 9.978 1.83432 9.42091 1.87109 8.9707C1.90851 8.5127 1.98772 8.10625 2.17969 7.72949L2.30176 7.51172C2.60586 7.0159 3.04236 6.6122 3.56348 6.34668L3.70606 6.28027C4.04237 6.136 4.40303 6.07083 4.80371 6.03809C5.14051 6.01057 5.53708 6.00551 6.00391 6.00391C6.00551 5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg></button></span></div></div></div></div>
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<p data-start="5343" data-end="5535">If you’d like, I can also provide <strong data-start="5377" data-end="5391">flowcharts</strong>, <strong data-start="5393" data-end="5418">small utility classes</strong>, or <strong data-start="5423" data-end="5440">template code</strong> for buffer pooling or using memory-mapped files efficiently. Let me know what you'd like next!</p>
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