Summary

Chapter summary

Let’s summarize this chapter:

• interface is similar to a class that consists only of abstract functions. interface can have static member variables and static or final member functions.

• For a class to be constructible, it must have implementations for all member functions of all interfaces that it inherits from.

• It is possible to inherit from an unlimited number of interfaces.

• A common hierarchy consists of a single interface and a number of subclasses that implement that interface.