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Java™ How to Program, Seventh Edition by P. J. Deitel - Deitel & Associates, Inc., H. M. Deitel - Deitel & Associates, Inc.

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10.1. Introduction

We now continue our study of object-oriented programming by explaining and demonstrating polymorphism with inheritance hierarchies. Polymorphism enables us to “program in the general” rather than “program in the specific.” In particular, polymorphism enables us to write programs that process objects that share the same superclass in a class hierarchy as if they are all objects of the superclass; this can simplify programming.

Consider the following example of polymorphism. Suppose we create a program that simulates the movement of several types of animals for a biological study. Classes Fish, Frog and Bird represent the three types of animals under investigation. Imagine that each of these classes extends superclass Animal ...

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