I don’t like to inherit implementation (create subclasses).1 When refactoring class hierarchies, I often pull behavior up into superclasses, then out into collaborators.2 Over time, I might find myself left with subclasses that only differ by overriding methods to return different constant values. Smalltalkers are used to this, but I never felt entirely comfortable with it. (No, I can’t explain that.) I often end up here because I’ve moved all the significant behavior variations out int...
