java.util.Collections.reverseOrder() Method

Description

The reverseOrder() method is used to get a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface.

Declaration

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

public static <T> Comparator<T> reverseOrder()

Parameters

• NA

Return Value

The method call returns a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface.

Exception

• NA

Example

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

package com.tutorialspoint;

import java.util.*;

public class CollectionsDemo {
   public static void main(String args[]) {  
      // create linked list object  	   
      LinkedList list = new LinkedList();  
      
      // populate the list 
      list.add(-28);  
      list.add(20);  
      list.add(-12);  
      list.add(8);  
      
      // create comparator for reverse order
      Comparator cmp = Collections.reverseOrder();  

      // sort the list
      Collections.sort(list, cmp);  
		  
      System.out.println("List sorted in ReverseOrder: ");      
      for(int i : list){
         System.out.println(i+ " ");
      }	
   }
}

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

List sorted in ReverseOrder: 
20 
8 
-12 
-28