OOP (course 3): Inheritance, Abstract Classes, Interfaces and other amazing things

Interfaces

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Challenge 1 / 2

You over-hear the intern Bob telling another teammate about the differences between abstract classes and interfaces. He's mostly right, but he got one detail wrong. Which of the following is not true:

Classes can implement many interfaces, but only extend one class.

Abstract classes can contain concrete methods, but interfaces can't.

Interfaces force the user to implement certain methods, abstract classes do not.

Even though Interfaces don't use the abstract keyword before methods, those methods act just like abstract methods in an abstract class.

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