Chapter 11 Inheritance and Polymorphism

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Presentation transcript:

Chapter 11 Inheritance and Polymorphism

Motivations Suppose you will define classes to model circles, rectangles, and triangles. These classes have many common features. What is the best way to design these classes so to avoid redundancy? The answer is to use inheritance.

Superclasses and Subclasses GeometricObject CircleFromSimpleGeometricObject RectangleFromSimpleGeometricObject TestCircleRectangle Run

Are superclass’s Constructor Inherited? No. They are not inherited. They are invoked explicitly or implicitly. Explicitly using the super keyword. A constructor is used to construct an instance of a class. Unlike properties and methods, a superclass's constructors are not inherited in the subclass. They can only be invoked from the subclasses' constructors, using the keyword super. If the keyword super is not explicitly used, the superclass's no-arg constructor is automatically invoked.

SimpleGeometricObject.java Pages 441-2 Listing 11.1

CircleFromSimpleGeometricObject.java Pages 412-3 Listing 11.2

RectangleFromSimpleGeometricObject.java Pages 414-5 Listing 11.3

TestCircleRectangle.java Page 415 Listing 11.4