CSC/ECE 517 Fall 2011/ch6 6b ra

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Subclassing


Introduction

Subclassing is one of the significant features of OO programming, which greatly increases the reusability of classes and also minimizes duplication of code. A subclass usually inherits some properties from a super class. Inheritance is a design principle in object oriented languages like Java. The reason behind inheritance is to reuse the code of existing objects or establish a subtype from an object. This greatly improves the efficiency and makes the code more readable as methods which are written only once can be used by a lot of subclasses. A superclass consists of common features that can be extended over subclasses. Superclass and subclass are commonly called base and derived class. The relationship between a subclass and superclass can be represented by a simple UML diagram as shown below.

Advantages of Subclassing

1. Method Overriding: This is the process where a subclass can override a method inherited from the base class. Most object oriented languages provide this feature.

Conclusion

See also

External Links:

References:

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