Java find HCF of two numbers

import java.util.*;

class HCF{

      public static int determineHCF(int a, int b) {

       if (b==0) 

       return a;

       else

       return determineHCF(b, a % b);

      }

        public static void main(String[] args)throws Exception {

                HCF cal = new HCF();

                Scanner input=new Scanner(System.in);

                System.out.println("Enter first number: ");

                int num1=input.nextInt();

                System.out.println("Enter second number: ");

                int num2=input.nextInt();

                   int hcf = cal.determineHCF(num1, num2);

                System.out.println("HCF of two numbers= "+hcf);

        }

}