#47 Need of Inheritance in Java

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In this lecture we will learn:
– Use of IS relationship in Java
– What is inheritance?
– Parent-child relationship in inheritance
– Need for an inheritance

#1
Use of ‘is’ in Java:-
– Laptop is a computer.
It means that a laptop contains all features that a computer exhibits.
– Through IS, we try to take the features of something.

#2
Inheritance:-
One class can inherit the properties and features of another class.
– Inheritance is a type of feature in Java through which we can copy properties to a class from an upper class.
– A class that inherits from another class can reuse the methods and fields of that class.
– Inheritance represents the IS-A relationship which is also known as a parent-child relationship.

#3
– In inheritance, there are two types of classes:-
1. Parent class/ Superclass/ Base class
2. Child class/ Subclass/ Derived class

Parent class: The class whose properties are inherited.
Child class: The class which inherits the properties of others.
– Child class accesses the features of a parent class.

#4
Need of an Inheritance:-
– Inheritance supports reusability. We can derive a new class from an existing class by including some features from the existing class.

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