8.4 Interfaces and Abstract Classes
Art, it seems to me, should simplify. that, indeed, is very nearly the whole of the higher artistic process; finding what conventions of form and what details one can do without and yet preserve the spirit of the whole . . .
—WILLA CATHER, On The Art of Fiction
Chapter 5 defined a class interface as the portion of a class that tells a programmer how to use it. In particular, a class interface consists of the headings for the public methods and public named constants of the class, along with any explanatory comments. Knowing only a class’s interface—that is, the specifications of its public methods—a programmer can write code that uses the class. The programmer does not need to know anything about the class’s ...
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