Inheritance

Definition - What does Inheritance mean?

Inheritance is a mechanism wherein a new class is derived from an existing class. In Java, classes may inherit or acquire the properties and methods of other classes.

A class derived from another class is called a subclass, whereas the class from which a subclass is derived is called a superclass. A subclass can have only one superclass, whereas a superclass may have one or more subclasses.

Techopedia explains Inheritance

Inheritance is the process wherein characteristics are inherited from ancestors. Similarly, in Java, a subclass inherits the characteristics (properties and methods) of its superclass (ancestor). For example, a vehicle is a superclass and a car is a subclass. The car (subclass) inherits all of the vehicle’s properties. The inheritance mechanism is very useful in code reuse. The following are some limitations of Java class inheritance: A subclass cannot inherit private members of its superclass. Constructor and initializer blocks cannot be inherited by a subclass. A subclass can have only one superclass.

The keyword “extends” is used to derive a subclass from the superclass, as illustrated by the following syntax: class Name_of_subclass extends Name_of superclass { //new fields and methods that would define the subclass go here } If you want to derive a subclass Rectangle from a superclass Shapes, you can do it as follows: class Rectangle extends Shapes { …. }

This definition was written in the context of Java.
Posted by:
Recommended For You close
Unix/Linux Shells 101

Read More »

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
Tweat cdn.techopedia.com
Techopedia on Twitter


'@Techopedia'
Sign up for Techopedia's Free Newsletter!

Email Newsletter

Join 138,000+ IT pros on our weekly newsletter

Resources
Free Whitepaper – Bridging the IT Operations Application Owner Gap
Free Whitepaper – Bridging the IT Operations Application Owner Gap:
Conflicting organizational needs all too often create tension between functional silos. Application owners demand more and more resources.
Free 30 Day Trial – VMTurbo Operations Manager
Free 30 Day Trial – VMTurbo Operations Manager:
VMTurbo's flagship product, Operations Manager maintains your virtual and cloud environments in a healthy state. It manages homogeneous and...