Java Proficiency: How to shuffle elements in ArrayList

Sunday 10 May 2015

import java.util.ArrayList;
import java.util.Collections;

public class Shuffle {

    public static void main(String[] args) {
        ArrayList<String> arr = new ArrayList<String>();
        // add element in arraylist
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");
        // print arraylist
        System.out.println("arrayList is = " + arr);

        /*
        * Randomly permutes the specified list using a default
           source of randomness
        */

        Collections.shuffle(arr);

        for (String el : arr) {
            System.out.println(el);
        }

        Collections.shuffle(arr);

        System.out.println("Second Time shuffle");
        for (String el : arr) {
            System.out.println(el);
        }

    }
}

Output:

arrayList is = [c, php, html, java]

java
c
php
html

Second Time shuffle

php
java
html
c

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