8. Frameworks and Reuse: Designing with Interfaces and Abstract Classes
Chapter 7, “Mastering Inheritance and Composition,” explains how inheritance and composition play major roles in the design of object-oriented (OO) systems. This chapter expands upon the concepts of interfaces, protocols, and abstract classes.
Interfaces, protocols, and abstract classes are powerful mechanisms for code reuse, providing the foundation for a concept I call contracts. This chapter covers the topics of code reuse, frameworks, contracts, interfaces, protocols, and abstract classes (for the remainder of the chapter, unless otherwise indicated, I use the term interface to include the concept of protocols). At the end of the chapter, we’ll work through an example ...
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