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Sort items of an ArrayList with Collections.reverseOrder() in Java
In order to sort items of an ArrayList with Collections.reverseOrder() in Java, 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 with Collections.reverseOrder() in Java -
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);
Collections.sort(list);
System.out.println("Sorted list : " + list);
Collections.sort(list,Collections.reverseOrder());
System.out.println("Sorted list using Collections.reverseOrder() : " + list);
}
}Output
Original list : [10, 50, 30, 20, 40, 60] Sorted list : [10, 20, 30, 40, 50, 60] Sorted list using Collections.reverseOrder() : [60, 50, 40, 30, 20, 10]
Updated on: 25-Jun-2020
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