Sort ArrayList Elements in Descending Order Java
In this article, we will see how to sort ArrayList elements in descending order using sort(List list, Collections.reverseOrder()) method.
Examples:
Input: 23, 54, 32, 56, 78, 65
Output: 78, 65, 56, 54, 32, 23
Input: Microsoft, Vmware, Salesforce, Apple, Facebook
Output: Vmware, Salesforce, Microsoft, Facebook, Apple
Example 1:
The below programs shows how to use sort(List list,Collections.reverseOrder()) to sort ArrayList elements in descending order. Here the elements are of Integer type.
import java.util.ArrayList;import java.util.Collections;public class ArrayListSortDescendingExample { public static void main(String[] args) { ArrayList<integer> numbers = new ArrayList<>(); numbers.add(23); numbers.add(54); numbers.add(32); numbers.add(56); numbers.add(78); numbers.add(65); System.out.println("Elements before sorting : " + numbers); Collections.sort(numbers, Collections.reverseOrder()); System.out.println("After sorting in descending order : " + numbers); }}</integer> |
Output:
Elements before sorting : [23, 54, 32, 56, 78, 65]After sorting in descending order : [78, 65, 56, 54, 32, 23] |
Example 2:
Let’s look at the program.
import java.util.ArrayList;import java.util.Collections;public class ArrayListSortDescendingDemo { public static void main(String[] args) { ArrayList<string> companies = new ArrayList<>(); companies.add("Microsoft"); companies.add("Vmware"); companies.add("Salesforce"); companies.add("Apple"); companies.add("Facebook"); System.out.println("Companies before sorting : " + companies); Collections.sort(companies, Collections.reverseOrder()); System.out.println("ArrayList Elements after sorting in descending order : " + companies); }}</string> |
Output:
Companies before sorting : [Microsoft, Vmware, Salesforce, Apple, Facebook]ArrayList Elements after sorting in descending order : [Vmware, Salesforce, Microsoft, Facebook, Apple] |
In this article, we saw how to use Collections.reverseOrder().
Further Reading:
ArrayList Reference.