Deriving an abstract class from concrete class

Question

Let\'s say we have a concrete class Apple. (Apple objects can be instantiated.) Now, someone comes and derives an abstract class Peach from Apple. It\'

Answer 1

It would seem to me like an indication of a bad design. Could be forced if you wanted to take a concrete definition from a closed library and extend it and branch a bunch of stuff off it, but at that point I'd be seriously considering the guideline regarding Encapsulation over Inheritance.. If you possibly can encapsulate, you probably should.

Yeah, the more I think about it, this is a Very Bad Idea.