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Program: How to shuffle elements in ArrayList?


Description:

This example gives how to shuffle elements in the ArrayList. By calling Collections.shuffle() method you can shuffle the content of the ArrayList. Everytime you call shuffle() method, it generates different order of output.


Code:
package com.java2novice.arraylist;

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

public class MyArrayListShuffle {

	public static void main(String a[]){
		ArrayList<String> list = new ArrayList<String>();
		list.add("Java");
		list.add("Cric");
		list.add("Play");
		list.add("Watch");
		list.add("Glass");
		list.add("Movie");
		list.add("Girl");
		
		Collections.shuffle(list);
		System.out.println("Results after shuffle operation:");
		for(String str: list){
			System.out.println(str);
		}
		
		Collections.shuffle(list);
		System.out.println("Results after shuffle operation:");
		for(String str: list){
			System.out.println(str);
		}
	}
}

Output:
Results after shuffle operation:
Movie
Girl
Watch
Glass
Java
Cric
Play
Results after shuffle operation:
Glass
Watch
Play
Girl
Cric
Movie
Java
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List Of All ArrayList Sample Programs:

  1. Basic ArrayList Operations.
  2. How to read all elements in ArrayList by using iterator?
  3. How to copy or clone a ArrayList?
  4. How to add all elements of a list to ArrayList?
  5. How to delete all elements from my ArrayList?
  6. How to find does ArrayList contains all list elements or not?
  7. How to copy ArrayList to array?
  8. How to get sub list from ArrayList?
  9. How to sort ArrayList using Comparator?
  10. How to reverse ArrayList content?
  11. How to shuffle elements in ArrayList?
  12. How to swap two elements in a ArrayList?
  13. How to convert list to csv string format?
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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