10. Object-Oriented Programming: Polymorphism and Interfaces

General propositions do not decide concrete cases.

—Oliver Wendell Holmes

A philosopher of imposing stature doesn’t think in a vacuum. Even his most abstract ideas are, to some extent, conditioned by what is or is not known in the time when he lives.

—Alfred North Whitehead

Objectives

In this chapter you’ll:

Image Learn the concept of polymorphism.

Image Use overridden methods to effect polymorphism.

Distinguish between abstract and concrete classes.

Declare abstract methods to create abstract ...

Get Java™ How To Program (Early Objects), Tenth Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.