Code Recipes Blog

In this post under Java Collections, I will show with example how to randomly shuffle elements of a list.

Below is the complete code for your reference.

Main class

1  package core.collection;
2  
3  import java.util.ArrayList;
4  import java.util.Collections;
5  import java.util.List;
6  
7  public class ShuffleListDemo {
8      public static void main(String[] args) {
9          List<Integer> integerList = new ArrayList<>(0);
10         integerList.add(1);
11         integerList.add(2);
12         integerList.add(3);
13         integerList.add(4);
14         integerList.add(5);
15 
16         System.out.println("Before shuffling: " + integerList);
17 
18         Collections.shuffle(integerList);
19 
20         System.out.println("After shuffling: " + integerList);
21     }
22 }

In the above code, at line 9 I create an list containing integer elements and populate it.

At line 28, I call “Collections” static method “shuffle” and pass the list as an argument.

This static method “shuffle” randomly shuffle the elements.

In this way we can shuffle the list elements.