The purpose of interfaces continued

Question

OK so I gather that Interfaces are a way to enforce that an object implements a certain amount of functionality, without having to use inheritance. Kind of like a contract.

Answer 1

Prefer Composition over Inheritance. This way, you can implement (say) eat() in a class that gets incorporated into all your animals as a data member. Write it once, reuse it, but in a way that doesn't bind one kind of functionality explicitly to another.

If you had two (or ten) different ways of eating, you could swap them out as needed.