Class design

Question

Hi All

I want to design a class AlgorithmClass, in that class, it will use an unknown class UserClass which will be developed later by its user.  In the UserClass, there are several methods UserMethodA(...), UserMethodB(...) ...etc.  One example is UserMethodX(double[] x, double[]y, ArrayList z).  The problem is at the time of design AlgorithmClass, the developer does not know any thing about the UserMethods look like and what kind variables will be passed to those methods.  What he wants is the return values from the UserClass Methods by calling those methods.  So in the AlgorithmClass, it will have a reference to the UserClass and calling UserClass.UserMethodA, .......  using delegate method or anything that works.

Possible to design this AlgorithmClass?

Thanks
Chang