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Java How to Program, Early Objects, 11th Edition
book

Java How to Program, Early Objects, 11th Edition

by Paul J. Deitel, Harvey Deitel
June 2017
Beginner
1296 pages
69h 23m
English
Pearson
Content preview from Java How to Program, Early Objects, 11th Edition

10.2 Polymorphism Examples

Let’s consider several additional examples of polymorphism.

Quadrilaterals

If class Rectangle is derived from class Quadrilateral, then a Rectangle object is a more specific version of a Quadrilateral. Any operation (e.g., calculating the perimeter or the area) that can be performed on a Quadrilateral can also be performed on a Rectangle. These operations can also be performed on other Quadrilaterals, such as Squares, Parallelograms and Trapezoids. The polymorphism occurs when a program invokes a method through a superclass Quadrilateral variable—at execution time, the correct subclass version of the method is called, based on the type of the reference stored in the superclass variable. You’ll see a simple code example ...

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Publisher Resources

ISBN: 9780134751962