Inheritance

 Doing Inheritance

• The meaning of inheritance is to take characteristic of one class into another class.
•  The mechanism of deriving new class from old class is known as inheritance.
•  The old class is known as base class or super class or parent class.
• The new class is known as sub class, derived class or child class.
•  Java allows different types of inheritance which are as follow:

1)Single inheritance

•  It has only one super class and only one sub class.

2)Multilevel inheritance

• one derived class can be derived from another class.

3)Hierarchical inheritance

• It has one super class and more than one subclass.

Syntax:

class subclass-name extends superclassname

{

variables declaration;

method declaration;

}

 The keyword extends signifies that the properties of the superclass name are

extended to the subclass name.

Example

Class A

{

……

……

}

Class B extends A

{

……

……

}

• Here, class B extend the properties of class A.
•  That means all properties of class A can go in the class B.
•  We can use the object of class B for use the properties of class A.