When I began using OOP outside of examples. Things like "MyView" extends from "BaseView" which goes on to extend from "OutputStream" or something like that. And

When I began using OOP outside of examples. Things like "MyView" extends from "BaseView" which goes on to extend from "OutputStream" or something like that. And then being able to choose any point in the inheritance tree to create a list to store objects that are exactly as specific as you need them.