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:
Learn the concept of polymorphism.
Use overridden methods to effect polymorphism.
Distinguish between abstract and concrete classes.
Declare abstract methods to create abstract ...
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