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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.
We then review the concept of inheritance and demonstrate how the inheritance models of popular object-oriented languages like Smalltalk [Goldberg83], Flavors [Moon86], and ObjectiveC [Cox84] fall short in their support of encapsulation. We examine the requirements for full support of encapsulation with inheritance.
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.
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
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 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 { . }
Most object-oriented programming languages support data abstraction by preventing an object from being manipulated except via its defined external operations. In most languages, however, the introduction of inheritance severely compromises the benefits of this encapsulation.
