Java Generics Extends Class Parameter

Question

I received an error and I have this structure in my program

public interface Shapes{
//methods here
}

public class ShapeAction implements          


        

Answer 1

You haven't really shown us enough code to tell what you're trying to achieve, but in general:

If you want to make a method that can accept multiple types of arguments, you want to parameterize the method, not the entire class.

public  Shape takeAction(T argument);

Obviously that doesn't really offer much compile time type safety, you'll still probably have to manually resolve the argument to some subset of restricted types at runtime.