Program of finding out the Greatest Common Division (GCD) or the Highest Common Factor (HCF) of the given two numbers, using while loop

/* Program of finding out the Greatest Common Division (GCD) or the Highest Common Factor (HCF) of the given two numbers, using while loop*/

class GCD
{
    public static void main(String args[])
    {
        int num_1 , num_2 ;
        num_1 = 25;
        num_2 = 15;
       
        System.out.print("The GCD of "+num_1+" and "+num_2);

        while ((num_1!=0) && (num_2!=0))
        {        
            if (num_1 > num_2)
                num_1 = num_1 - num_2 ;
            else
                num_2 = num_2 - num_1 ;
        }

        System.out.print(" is "+num_1);
    }
}