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Interfaces Explained

In the last hour, you worked with collections, and the term interface was used often without any deep discussion on what an interface is or does. An interface provides a contract between itself and the object that will implement it. It's similar to the concept of class declaration and class definition. In other words, if you create a class declaration within a header file but do not implement any of the functions within the source file (.cpp file) and then try to compile, the compiler will inform you that the member function definitions are missing. More specifically, you told the compiler you were going to make a class with certain member functions but then failed to do so.

Similarly, if you create a class and say that it ...