Java: Shuffle elements in a array list

Last update on May 21 2025 12:47:35 (UTC/GMT +8 hours)

10. Shuffle ArrayList

Write a Java program to shuffle elements in an array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Shuffle elements in a list

Sample Solution:-

Java Code:

import java.util.*;
  public class Exercise10 {
  public static void main(String[] args) {
  // Creae a list and add some colors to the list
  List<String> list_Strings = new ArrayList<String>();
  list_Strings.add("Red");
  list_Strings.add("Green");
  list_Strings.add("Orange");
  list_Strings.add("White");
  list_Strings.add("Black");
  System.out.println("List before shuffling:\n" + list_Strings);  
  Collections.shuffle(list_Strings);
  System.out.println("List after shuffling:\n" + list_Strings); 
 }
}

Sample Output:

List before shuffling:                                                 
[Red, Green, Orange, White, Black]                                     
List after shuffling:                                                  
[White, Orange, Black, Red, Green]

Flowchart:

For more Practice: Solve these Related Problems:

Write a Java program to shuffle an ArrayList using Collections.shuffle() and then print the randomized list.
Write a Java program to shuffle an ArrayList multiple times and check if the order changes with each shuffle.
Write a Java program to implement a custom shuffle algorithm for an ArrayList without using built-in methods.
Write a Java program to shuffle an ArrayList and then restore the original order using a saved copy.

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