2.3.2.1 Code reuse without polymorphism.

One application of multiple inheritance is to provide an implementation of an abstraction, using a concrete class. This has been called ``the marriage of convenience'' in [27]. In C++, private inheritance is used for a similar purpose. In both cases the inheriting class is not intended to be a subtype of the concrete class, it just reuses its code to implement the interface of the abstraction. In Java, this corresponds to a child class that forwards to the concrete class and inherits from an abstract class (or implements an interface) that represents the abstraction. An example would be an abstract class Stack³ that can be implemented using different underlying concrete data types, for example, an Array or a LinkedList.