Example 1. Java Program to Sort an Array in an Ascending Order and Descending Order

Program:

import java.util.Scanner;

/*
 * Program to Sort an Array in Ascending Order and Descending Order
 * */
public class ArraySortingExample {
    public static void main(String[] args) {
        Scanner ed = new Scanner(System.in);
        int[] a = new int[5];
        int i, j, temp;
        System.out.println("Please Enter 5 elements in the Array");
        for (i = 0; i < 5; i++) {
            a[i] = ed.nextInt();
        }
        for (i = 0; i < 5; i++) {
            for (j = i + 1; j < 5; j++) {
                if (a[i] > a[j]) {
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        System.out.println("Sorted Array in Increasing Order:-");
        for (j = 0; j < 5; j++) {
            System.out.println(a[j]);
        }
        for (i = 0; i < 5; i++) {
            for (j = i + 1; j < 5; j++) {
                if (a[i] < a[j]) {
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        System.out.println("Sorted Array in Decreasing Order:-");
        for (j = 0; j < 5; j++) {
            System.out.println(a[j]);
        }
    }
}

Output:

Please Enter 5 elements in the Array
45
3
12
5
34
23
Sorted Array in Increasing Order:-
3
5
12
34
45
Sorted Array in Decreasing Order:-
45
34
12
5
3

Example 2. Java Program to sort an array in Ascending Order Using Arrays.sort() method

Program:

import java.util.*;
public class ArraySortingExample {
    public static void main(String[] args) {
        Scanner ed = new Scanner(System.in);
        Integer[] arr = new Integer[5];
        int i;
        System.out.println("Please Enter 5 elements in the Array : ");
        for (i = 0; i < 5; i++) {
            arr[i] = ed.nextInt();
        }

        Arrays.sort(arr);
        System.out.println("Sorted Array in Ascending Order " + Arrays.toString(arr));

        Arrays.sort(arr,Comparator.reverseOrder());
        System.out.println("Sorted Array in Descending Order " + Arrays.toString(arr));
    }
}

Output:

Please Enter 5 elements in the Array : 
45
3
234
54
2321

Sorted Array in Ascending Order [3, 45, 54, 234, 2321]
Sorted Array in Descending Order [2321, 234, 54, 45, 3]