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Java 8 for beginners - Part 1

  1. Java 8 for beginners - Part 1


JAVA 8 is a major feature release of Java programming language. It was initially released on 18 March 2014. Java 8 provides support for functional programming, new JavaScript engine, new APIs for date time manipulation, new streaming API, etc.

Below are some of the new features in Java 8 :

1) Lambda expression βˆ’ Adds functional processing capability to Java.

2) Method references βˆ’ Referencing functions by their names instead of invoking them directly. Using functions as parameter.

3) Default method βˆ’ Interface to have default method implementation.

4) New tools βˆ’ New compiler tools and utilities are added like β€˜jdeps’ to figure out dependencies.

5) Stream API βˆ’ New stream API to facilitate pipeline processing.

6) Date Time API βˆ’ Improved date time API.

7) Optional βˆ’ Emphasis on best practices to handle null values properly.

8) Nashorn, JavaScript Engine βˆ’ A Java-based engine to execute JavaScript code.

Check out below program to sort names in Java 7 vs Java 8 to understand how lambda help us write a clean and elegant code in java.

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Main {

    public static void main(String[] args) {
        List<String> names1 = new ArrayList<String>();
        names1.add("Sam ");
        names1.add("James ");
        names1.add("Wilson ");
        names1.add("Edward ");
        names1.add("Ramesh ");

        List<String> names2 = new ArrayList<String>();
        names2.add("Sam ");
        names2.add("James ");
        names2.add("Wilson ");
        names2.add("Edward ");
        names2.add("Ramesh ");

        Main tester = new Main();
        System.out.println("Sort using Java 7 syntax: ");

        System.out.println("Sort using Java 8 syntax: ");


    //sort by java 7
    private void sortByJava7(List<String> names) {
        Collections.sort(names, new Comparator<String>() {
            public int compare(String s1, String s2) {
                return s1.compareTo(s2);

    //sort by java 8
    private void sortByJava8(List<String> names) {
        Collections.sort(names, (s1, s2) -> s1.compareTo(s2));

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Output :

Sort using Java 7 syntax: 
[Edward , James , Ramesh , Sam , Wilson ]
Sort using Java 8 syntax: 
[Edward , James , Ramesh , Sam , Wilson ]
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