Question

Lets say i have a method

public abstract void doMath(Holder h);

But I want the user to be able to adjust the class being passed in. Like such

public abstract void doMath(ClassOfPersonalChoice h);

How would I go about doing that.

Thank you for your time and effort.

PS: The class being passed contains a bunch of variables.
ie.

class ClassofPersonalChoice{
    double hue = 0;
int R = 240;
int G = 10;
int B = 180;
}

Answer 1

If you say

public abstract void doMath(Object h);

then the user can implement whatever he wants.

Advanced idea: use generics/type parameters:

public abstract class MathClass<T> {

   public abstract void doMath(T holder);

}

---

public class IntegerMathClass extends MathClass<ClassOfPersonalChoice> {

    @Override
    public void doMath(ClassOfPersonalChoice holder) {
      // do something with the value
    }

 }