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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.
Encapsulation has many advantages in terms of improving the understandability of programs and facilitating program modification. Unfortunately, in most object-oriented languages, the introduction of inheritance severely compromises encapsulation.
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.
OBJECTIVES. 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.
Inheritance allows a programmer to separate those attributes and behaviors that are shared between vehicle types and those that are unique to each particular type. The shared features are collected in a
Inheritance is a binary relation between classes (say P and Q) that enables one to define a class (Q) in terms of another class (P) incrementally, by adding new fields, adding new methods, or modifying existing methods through overriding. A class Q is a subclass of class P if class Q inherits from class P. class P { . }
• 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
