Java program to reverse of a numer

import java.util.Scanner;
class Armstrong
{
public static void main(String args[])
{
int r,sum=0;
int  num=153;
int temp=num;
Scanner kb=new Scanner(System.in);
System.out.println("enter the number");
num=kb.nextInt();
while(num>0)
{
r=num%10;
num=num/10;
sum=sum+r*r*r;
}
if(temp==sum)
{
System.out.println("given string is armstrong");

}
else
{
System.out.println("given string is not armstrong");
}
}
}