Java Program to sort the elements of an array in descending order

Teacher
Sateesh M
Category
Programaming
Review
- (3268 Reviws)

To sort the elements of an array in descending order in Java, you can use the sort method of the Arrays class, along with a custom comparator that compares the elements in reverse order. Here's an example of how to use this approach to sort an array of integers:


import java.util.Arrays;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        Integer[] arr = {3, 6, 1, 2, 5, 4};
        
        Arrays.sort(arr, Comparator.reverseOrder());

        for (int i : arr) {
            System.out.print(i + " ");
        }
    }
}

In this example, the program creates an array arr of integers and assigns it the values {3, 6, 1, 2, 5, 4}. The Arrays.sort(arr, Comparator.reverseOrder()) line sorts the array in descending order using the Comparator.reverseOrder().

Another approach is to use a custom comparator which compares the two elements of the array. It returns a positive integer, 0 or a negative integer if first element is greater than, equal to, or less than the second element.


import java.util.Arrays;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        Integer[] arr = {3, 6, 1, 2, 5, 4};
        
        Arrays.sort(arr, (x, y) -> y - x);

        for (int i : arr) {
            System.out.print(i + " ");
        }
    }
}

Additionally, you can implement your own sorting algorithm and reverse the order of swapping the elements of the array. This will sort the array in descending order.

Note that it's important to use the Integer type instead of primitive int type to use the above methods on an array of integers, as the Arrays.sort method and the Comparator class work with objects, not primitive data types.