Verification of Armstrong number using JAVA

import java.util.*;
class DemoArmstrong {
    public static void main(String args[]) {
        int n, sum = 0, temp, r;
        Scanner in = new Scanner(System. in );
        System.out.print("Enter a number to check if it is an armstrong number: ");
        n = in .nextInt();
        temp = n;
        while (temp != 0) {
            r = temp % 10;
            sum = sum + r * r * r;
            temp = temp / 10;
        }
        if (n == sum) System.out.println("Entered number is an armstrong number.");
        else System.out.println("Entered number is ''not'' an armstrong number.");
    }
}