java.util.Collections.shuffle() Method


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Description

The shuffle(List<?>, Random) method is used to randomly permute the specified list using the specified source of randomness.

Declaration

Following is the declaration for java.util.Collections.shuffle() method.

public static void shuffle(List<?> list,Random rnd)				 

Parameters

  • list -- The list to be shuffled.

  • rnd -- The source of randomness to use to shuffle the list.

Return Value

  • NA

Exception

  • UnsupportedOperationException -- This is thrown if the specified list or its list-iterator does not support the set operation.

Example

The following example shows the usage of java.util.Collections.shuffle()

package com.tutorialspoint;

import java.util.*;

public class CollectionsDemo {
   public static void main(String args[]) {  
   // create Linked List
   LinkedList list = new LinkedList(); 
      
   // populate list
   list.add(52);  
   list.add(27);  
   list.add(14);  
   list.add(-33);
      
   System.out.println("List before shuffle: "+list);   

   // shuffle the list
   Collections.shuffle(list);  
	  
   System.out.println("List after shuffle: "+list);
   }
}

Let us compile and run the above program, this will produce the following result.

List before shuffle: [52, 27, 14, -33]
List after shuffle: [14, -33, 27, 52]

java_util_collections.htm

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