Comparator reverseOrder() method in Java with examples

The reverseOrder() method of Comparator Interface in Java returns a comparator that use to compare Comparable objects in reverse of natural order. The returned comparator by this method is serializable and throws NullPointerException when comparing null.

Syntax:

static <T extends Comparable<T>> 
    Comparator<T> reverseOrder()

Parameters: This method accepts nothing.



Return value: This method returns a comparator that imposes the reverse natural ordering on Comparable objects.

Below programs illustrate reverseOrder() method:
Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate
// Comparator.reverseOrder()  method
  
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
  
public class GFG {
    public static void main(String... args)
    {
  
        List<Integer> values
            = Arrays.asList(212, 324,
                            435, 566,
                            133, 100,
                            121);
  
        // reverseOrder is a static method
        values.sort(Comparator.reverseOrder());
  
        // print sorted number based on natural order
        System.out.println(values);
    }
}

chevron_right


The output printed on console of IDE is shown below.
Output:

Program 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate
// Comparator.reverseOrder()  method
  
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
  
public class GFG {
    public static void main(String... args)
    {
  
        List<String> stringList
            = Arrays.asList("Aman", "Kajal",
                            "Joyita", "Das");
  
        System.out.println("Before sorting:");
        stringList.forEach(System.out::println);
  
        stringList.sort(Comparator.reverseOrder());
        System.out.println("\nAfter sorting:");
        stringList.forEach(System.out::println);
    }
}

chevron_right


The output printed on console is shown below.
Output:

References: https://docs.oracle.com/javase/10/docs/api/java/util/Comparator.html#reverseOrder()



My Personal Notes arrow_drop_up

I am a Developer I love to code and bring my ideas alive

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.