Collections.shuffle(List, Random) in Java

Collections.shuffle(List, Random): This method is available in java.util.Collections class of Java.

Syntax:

void java.util.Collections.shuffle(List<?> list, Random rnd)

This method takes two arguments. This method randomly permutes the specified list using the specified source of randomness.

Note: All permutations occur with equal likelihood assuming that the source of randomness is fair.

Parameters: Two parameters are required for this method.

list: the list to be shuffled.

rnd: the source of randomness to use to shuffle the list.

Throws:

1. UnsupportedOperationException - if the specified list or its list-iterator does not support the set operation.

Approach

Java

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

public class Collectionsshuffle2 {
    public static void main(String[] args) {

        List<Integer> arrlist = new ArrayList<Integer>();

        arrlist.add(12);
        arrlist.add(56);
        arrlist.add(899);
        arrlist.add(65);
        arrlist.add(5);

        Random rnd = new Random();
        Collections.shuffle(arrlist, rnd);

        System.out.println(arrlist);

    }
}

Output:

[65, 56, 12, 899, 5]