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  • God object? Commented Jan 22, 2017 at 18:19
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    @gardenhead has a good answer. Also see en.wikipedia.org/wiki/Subtyping. Polymorphism in OOP is often referred to as inclusion polymorphism in broader contexts, because there are also other kinds of polymorphism. Commented Jan 23, 2017 at 6:28
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    What you have there is often referred to as multiple inheritance (multiple interface inheritance in Java and C# as they don't have full multiple inheritance, I have not seem many languages that do full multiple inheritance properly). Polymorphism usually refers to multiple implementations inheriting from a single interface, to that one implementation can stand in for another. Commented Jan 23, 2017 at 23:17
  • That's what my interviewer said about inheritance, but I didn't agree much with him, because what is missing here is the behaviour/implementation inheritance, unlike C++. I reviewed the Gamma et. all introductory chapter of their book and I believe the whole point is, like you said, the ability to substitute an object to another, so the clients don't depend on a particular object, but on interfaces. Interface in Gamma is different from the interface from C# or Java. Gamma considers the object's interface the totatity of its public methods. A type is a name to denote a particular interface. Commented Jan 24, 2017 at 7:27