Java 12 String Functions

Author: Pankaj Kumar

CoreJavaProjects/CoreJavaExamples/.classpath

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-10">
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.launching.macosx.MacOSXType/Java 12">
 		<attributes>
 			<attribute name="module" value="true"/>
 		</attributes>

CoreJavaProjects/CoreJavaExamples/README.md

@@ -28,6 +28,7 @@
 
 ## Files and Java IO
 
+* [Java IO Tutorial](https://www.journaldev.com/942/java-io-tutorial)
 * [Java Create File](https://www.journaldev.com/825/java-create-new-file)
 * [Java Delete File](https://www.journaldev.com/830/java-delete-file-directory)
 * [Java Read File](https://www.journaldev.com/312/java-read-file)
@@ -46,11 +47,20 @@
 * [Java Read File to String](https://www.journaldev.com/875/java-read-file-to-string)
 * [Java Write to File](https://www.journaldev.com/878/java-write-to-file)
 * [Java Append to File](https://www.journaldev.com/881/java-append-to-file)
+* [Java Check if File is a Directory?](https://www.journaldev.com/909/check-file-directory-file-java)
+* [Java Check if File Exists?](https://www.journaldev.com/912/java-check-if-file-exists)
+* [Java Get Last Modified Time of File](https://www.journaldev.com/915/get-file-last-modified-date-time-java)
+* [java InputStream to File](https://www.journaldev.com/918/java-inputstream-to-file-example)
+* [Java RandomAccessFile](https://www.journaldev.com/921/java-randomaccessfile-example)
+* [Java Download File from URL](https://www.journaldev.com/924/java-download-file-url)
+* [Java ObjectOutputStream - Write Object to File](https://www.journaldev.com/927/objectoutputstream-java-write-object-file)
+* [Java ObjectInputStream - Read Object from File](https://www.journaldev.com/933/objectinputstream-java-read-object-file)
 
 
 ## Miscellaneous Articles
 
 * [Comparable and Comparator in Java](https://www.journaldev.com/780/comparable-and-comparator-in-java-example)
 * [Java Sort List](https://www.journaldev.com/787/java-sort-list)
 * [Enum in Java](https://www.journaldev.com/716/java-enum)
-* [Java FTP Client](https://www.journaldev.com/661/java-ftp-client-upload-example-apache-commons-net)
+* [Java FTP Client](https://www.journaldev.com/661/java-ftp-client-upload-example-apache-commons-net)
+* [Compile and Run Java Program from another Java Program](https://www.journaldev.com/937/compile-run-java-program-another-java-program)

CoreJavaProjects/CoreJavaExamples/src/com/journaldev/string/JDK12StringFunctions.java

@@ -0,0 +1,37 @@
+package com.journaldev.string;
+
+import java.lang.invoke.MethodHandles;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+
+public class JDK12StringFunctions {
+
+	public static void main(String[] args) {
+		String str = "*****\n  Hi\n  \tHello Pankaj\rHow are you?\n*****";
+
+		// 1. public String indent​(int n)
+		System.out.println(str.indent(0));
+		System.out.println(str.indent(3));
+		System.out.println(str.indent(-3));
+
+		// 2. public <R> R transform​(Function<? super String,​? extends R> f)
+		String s = "Hi,Hello,Howdy";
+		List<String> strList = s.transform(s1 -> {return Arrays.asList(s1.split(","));});
+		System.out.println(strList);
+
+		//Java 12 String implements Constable, ConstantDesc - hence two new methods
+		// 3. public Optional<String> describeConstable()
+		String so = "Hello";
+		Optional<String> os = so.describeConstable();
+		System.out.println(os);
+		System.out.println(os.get());
+		
+		// 4. public String resolveConstantDesc​(MethodHandles.Lookup lookup)
+		String so1 = "Hello";
+		System.out.println(so1.resolveConstantDesc(MethodHandles.lookup()));
+		
+		
+	}
+
+}