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JAVA 8 is a major feature release of JAVA programming language development. Its initial version was released on 18 March 2014. With the Java 8 release, Java provided supports for functional programming, new JavaScript engine, new APIs for date time manipulation, new streaming API, etc.

New Features

  • Lambda expression − Adds functional processing capability to Java.

  • Method references − Referencing functions by their names instead of invoking them directly. Using functions as parameter.

  • Default method − Interface to have default method implementation.

  • New tools − New compiler tools and utilities are added like ‘jdeps’ to figure out dependencies.

  • Stream API − New stream API to facilitate pipeline processing.

  • Date Time API − Improved date time API.

  • Optional − Emphasis on best practices to handle null values properly.

  • Nashorn, JavaScript Engine − A Java-based engine to execute JavaScript code.

Consider the following code snippet.

 Live Demo

import java.util.Collections; import java.util.List; import java.util.ArrayList; import java.util.Comparator; public class Java8Tester { public static void main(String args[]) { List<String> names1 = new ArrayList<String>(); names1.add("Mahesh "); names1.add("Suresh "); names1.add("Ramesh "); names1.add("Naresh "); names1.add("Kalpesh "); List<String> names2 = new ArrayList<String>(); names2.add("Mahesh "); names2.add("Suresh "); names2.add("Ramesh "); names2.add("Naresh "); names2.add("Kalpesh "); Java8Tester tester = new Java8Tester(); System.out.println("Sort using Java 7 syntax: "); tester.sortUsingJava7(names1); System.out.println(names1); System.out.println("Sort using Java 8 syntax: "); tester.sortUsingJava8(names2); System.out.println(names2); } //sort using java 7 private void sortUsingJava7(List<String> names) { Collections.sort(names, new Comparator<String>() { @Override public int compare(String s1, String s2) { return s1.compareTo(s2); } }); } //sort using java 8 private void sortUsingJava8(List<String> names) { Collections.sort(names, (s1, s2) -> s1.compareTo(s2)); } }

Run the program to get the following result.

Sort using Java 7 syntax:
[ Kalpesh Mahesh Naresh Ramesh Suresh ]
Sort using Java 8 syntax:
[ Kalpesh Mahesh Naresh Ramesh Suresh ]

Here the sortUsingJava8() method uses sort function with a lambda expression as parameter to get the sorting criteria.

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