Generate Amstrong Number in Java

//Amstrong Number Generation
import java.io.*;
class Amstrong
{
int sum=0,rem,t;
void check(int num)
{
t=num;
while( num !=0 )
{
rem= num % 10;
sum = sum + rem*rem*rem;
num = num/10;
}
if( sum == t)
System.out.println(" The number is an amstrong number");
else
System.out.println("The given number is not an amstrong number");
}
public static void main(String args[])throws IOException
{
Amstrong am= new Amstrong();
int n;
BufferedReader b= new BufferedReader(new InputStreamReader(System.in));
System.out.println(" Enter the number:");
n=Integer.parseInt(b.readLine());
am.check(n);
}
}