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Inheritance is frequently used to integrate your code with library code -- subclass off a library class, 90% inherit the standard behavior, and 10% override a few key methods. This is the most common use of inheritance. This works best if the superclass code is deliberately factored into methods to support overriding.
In this chapter you will learn: How inheritance promotes software reusability. The notions of superclasses and subclasses. To use keyword extends to create a class that inherits attributes and behaviors from another class. To use access modifier protected to give subclass methods access to superclass members.
Object-Oriented Programming: Polymorphism and Interfaces, explains how to use Java interfaces to realize many of the benefits of multiple inheritance while avoiding the associ- ated problems.
• Inheritance: allowing code to be reused between related types • Polymorphism: allowing a value to be one of several types, and determining at runtime which functions to call on it based on its type
OOP2 -- Inheritance. Modularity and encapsulation are the most important parts of OOP. OOP also includes a significant inheritance component. But first, a word of warning. Inheritance is a neat and intellectually appealing bit of technology. However, true uses of inheritance are somewhat rare.
The object-oriented programming (OOP) paradigm is based on three fundamental mechanisms: Encapsulation Inheritance Polymorphism Encapsulation, the focus of Chapter 9, is the language construct that bundles data and methods into a single class specification. Inheritance and polymorphism are addressed in the following sections.
Represent programs as a set of objects that encapsulate data and methods (state and behaviour) and pass messages between one another.
