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<a href="/archive/Lambda-Serializable问题/">
<h2 class="post-title">
Lambda Serializable问题
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Lambda Serializable
在研究Lambda的原理时，看到了一个很有意思的问题。Java中普通lambda表达式和方法引用本质上有什么区别？
其中的提问者遇到了在使用 Lambda 表达式 foreach(System.out::println) 的时候 抛出PrintStream没有序列化的异常。而使用 foreach(item->System.out.println(......
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Posted by 阮圣伟 on
2019-06-26
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<a href="/tags/#开心一刻" title="开心一刻">开心一刻</a>
<a href="/tags/#java-lang" title="java-lang">java-lang</a>
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Lambda原理
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</h3>
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Lambda用法
1234567891011public class LambdaDemo { public static void main(String[] args) { Func add = (x, y) -> x + y; System.out.println(add.exec(1, 2)); } @F......
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Posted by 阮圣伟 on
2019-06-22
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</div>
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<a href="/archive/Java代理探究/">
<h2 class="post-title">
Java代理探究
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</h3>
<div class="post-content-preview">
java代理模式
静态代理。最简单的代理
动态代理（JDK代理）Spring AOP MyBatis 针对接口
Cglib代理 Spring AOP 接口、类都可使用
静态代理
特点：静态代理在编译时就已经实现，编译完成后代理类是一个实际的class文件
静态代理demo演示
123456789101112131415//静态代理类public class UserDao......
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<p class="post-meta" style="margin: 10px 0;">
Posted by 阮圣伟 on
2019-06-17
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<a href="/tags/#开心一刻" title="开心一刻">开心一刻</a>
<a href="/tags/#java-lang" title="java-lang">java-lang</a>
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<a href="/archive/ThreadLocal与WeakReference/">
<h2 class="post-title">
ThreadLocal与WeakReference
</h2>
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</h3>
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ThreadLocal
对于ThreadLocal来说需要掌握的就是它的结构。以及在Thread中是如何工作的。
ThreadLocal中有一个内部类ThreadLocalMap
ThreadLocalMap 中 使用继承自WeakReference的 Entry来保存value 。类似HashMap 中含有 table[] ，ThreadLocalMap 中有 Entry[] ......
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<p class="post-meta" style="margin: 10px 0;">
Posted by 阮圣伟 on
2019-06-13
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<a href="/tags/#开心一刻" title="开心一刻">开心一刻</a>
<a href="/tags/#线程" title="线程">线程</a>
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<a href="/archive/线程、线程池几个有意思的问题/">
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线程、线程池几个有意思的问题
</h2>
<h3 class="post-subtitle">
HashMap 多线程扩容如何形成环的 线程池参数 线程池集群 线程之间按顺序执行
</h3>
<div class="post-content-preview">
HashMap 多线程扩容如何形成环的
简而言之。当扩容时，HashMap 扩大bucket 后，需要rehash 所有的值，放到新的位置之下。
当其中一个位置存在冲突（具有链表）时，线程A和线程B 都会去重新计算位置（链表中每个值的新位置）。
因为是链表，需要一个一个遍历下去，所以有两个引用，一个是当前的e 一个是next。算好e的位置后，再获取next的next，然后算nex......
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<p class="post-meta" style="margin: 10px 0;">
Posted by 阮圣伟 on
2019-06-11
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<a href="/tags/#开心一刻" title="开心一刻">开心一刻</a>
<a href="/tags/#线程" title="线程">线程</a>
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<h2 class="post-title">
tk通用mapper Optional支持
</h2>
<h3 class="post-subtitle">
MyBatis 3.5之后支持返回值Optional
</h3>
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MyBatis 3.5 新特性
Optional 支持 --Support java.util.Optional as return type of mapper method (因此 MyBatis 3.5 最低版本要求就是 1.8)
123456public interface UserMapper { @Select("select * from users where i......
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<p class="post-meta" style="margin: 10px 0;">
Posted by 阮圣伟 on
2019-06-07
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<a href="/tags/#java-lang" title="java-lang" rel="2">java-lang</a>
<a href="/tags/#线程" title="线程" rel="2">线程</a>
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<h5>RECENT POSTS</h3>
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<a href="/archive/Lambda-Serializable问题/">Lambda Serializable问题</a>
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<a href="/archive/Lambda原理/">Lambda原理</a>
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<a href="/archive/Java代理探究/">Java代理探究</a>
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<a href="/archive/ThreadLocal与WeakReference/">ThreadLocal与WeakReference</a>
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<a href="/archive/线程、线程池几个有意思的问题/">线程、线程池几个有意思的问题</a>
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<li><a href="https://www.cnblogs.com/zhazhaR" target="_blank">博客园 Blog 阮圣伟</a></li>
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<h5>ARCHIVES</h5>
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<ul class="archive-list"><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/06/">June 2019</a><span class="archive-list-count">6</span></li></ul>
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