Example function calls:
public static void main(String[] args) {
    System.out.println(factorial(3));
    int f = factorial(4);
    System.out.println(f);
}

Program outputs:
6
24







import java.util.Random;

public class Test{
    public static void main(String[] args){
        final Random r = new Random();
        
        int[] p = {2,3,4,6,1};
        for (int pa : p) {
            System.out.println("Testing with parameter value " + pa);
            System.out.println("Factorial: " + factorial(pa));
            System.out.println("");
        }
        
    }


    public static int factorial(int pa) {
        int fact = 1;

        for (int i=1; i<=pa; i++) {
          fact *= i;
        }
        return fact;
    }







}







Testing with parameter value 2
Factorial: 2

Testing with parameter value 3
Factorial: 6

Testing with parameter value 4
Factorial: 24

Testing with parameter value 6
Factorial: 720

Testing with parameter value 1
Factorial: 1