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Sort ArrayList in Descending order using Comparator with Java Collections
In order to sort ArrayList in Descending order using Comparator, we need to use the Collections.reverseOrder() method which returns a comparator which gives the reverse of the natural ordering on a collection of objects that implement the Comparable interface.
Declaration − The java.util.Collections.reverseOrder() method is declared as follows -
public static <T>Comparator<T> reverseOrder()
Let us see a program to sort an ArrayList in Descending order using Comparator with Java Collections −
Example
import java.util.*;
public class Example {
public static void main (String[] args) {
ArrayList<Integer> list = new ArrayList<Integer>();
list.add(10);
list.add(50);
list.add(30);
list.add(20);
list.add(40);
list.add(60);
System.out.println("Original list : " + list);
Comparator c = Collections.reverseOrder();
Collections.sort(list,c);
System.out.println("Sorted list using Comparator : " + list);
}
}Output
Original list : [10, 50, 30, 20, 40, 60] Sorted list using Comparator : [60, 50, 40, 30, 20, 10]
Updated on: 29-Jun-2020
4K+ Views
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