Factorial in Java

public class Factorial {

      public static void main(String[] args) {

            Factorial f = new Factorial();

            int num = 6;

            int fact = f.factorial(6);

            System.out.println(num + " factorial is " + fact);

      }

      public int factorial(int n) {

            if (n == 1)

                  return 1;

            return n * factorial(n - 1);

      }

}