How to call a method from another class with no constructor

Question

I'm having a bit of trouble on a program at school.

I have to call a method called factorial in my FactorialCalculator class through a method called factorial in my BCD class. Normally, I would do something like this:

FactorialCalculator newCalc = new FactorialCalculator(8);

However, factorial is the only method in the FactorialCalculator class, and I am not allowed to make any more methods, including a constructor.

Any suggestions?

Answer 1

Create it as a static method:

public class FactorialCalculator {
    public static int factorial(int number) {
        // Calculate factorial of number
    }
}

And you can call it this way:

int factorial = FactorialCalculator.factorial(5); // for the example

A static method is a method that is not associated with any instance of any class, & it can be accessed using the Classname.staticMethod( ) notation.