Inheritance defines classes in terms of existing classes; a child class inherits data and operations from its parent class. The child class can then override parent-class operations, if permitted, and add some of its own.

Composition, however, is implemented as an object containing internal references to other objects and interacting with other objects through interface members. Composition thus depends on relationships between objects not inheritance.

The Second Principle of OO Design states "Favor object composition over class inheritance."

Do you agree or disagree? Why? Please give us your opinion on this issue and critique at least one other student's opinion.