Java program to check ArmStrong Number

Java program to check ArmStrong Number:

package javaapplication1;
import java.util.*;

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

      Scanner in = new Scanner(System.in);
      System.out.println("Enter a number to check if it is an armstrong number");    
      n = in.nextInt();

      og = n;

      while( og != 0 )
      {
         r = og%10;
         sum = sum + r*r*r;
         og = og/10;
      }

      if ( n == sum )
         System.out.println("Entered number is an armstrong number.");
      else
         System.out.println("Entered number is not an armstrong number.");        
   }
}