Java - shuffle ArrayList

In this article, we would like to show you how to shuffle ArrayList in Java.

Quick solution:

Collections.shuffle(myArrayList);

Practical example

In this example, we use Collections.shuffle() method to randomize numbers ArrayList.

import java.util.*;

public class Example {

    public static void main(String[] args) {
        List<Integer> numbers = new ArrayList<>();

        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        numbers.add(4);
        numbers.add(5);

        System.out.println("Before: " + numbers);

        Collections.shuffle(numbers);  // shuffle ArrayList

        System.out.println("After:  " + numbers);
    }
}

Output:

Before: [1, 2, 3, 4, 5]
After:  [1, 5, 4, 3, 2]