Write a program for Armstrong Number in java?

package com.srini.programs;

import java.util.Scanner;

public class ArmstrongNumber {
public static void main(String args[])
  {
     int n, sum = 0, temp, r;

     Scanner in = new Scanner(System.in);
     System.out.println("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.");        
  }
}