Armstrong Number in Java

Armstrong Number:

Armstrong Number is three digits of a positive number where the sum of the cubes of its digits is equal to the number itself.

import java.util.Scanner;
public class Armstrong_Number
{
    public static void main(String[] args)
    {
        int n, Sum = 0, num, r;
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the number: ");
        n = sc.nextInt();
        num = n;
        while (num > 0)
        {
            r = num % 10;
            Sum = Sum + (r * r * r);
            num = num / 10;
        }
        if (n == Sum)
        {
            System.out.println("It's An Armstrong Number!");
        }
        else
        {
            System.out.println("It's Not Armstrong Number!");
        }
    }
}

Output: