Hemant Kurmi - Diffrence Between Abstract class Interface

Difference Between
Sno	Abstract class	Interface
1	1) Abstract class can have abstract and non-abstract methods.	Interface can have only abstract methods.
2	2) Abstract class doesn't support multiple inheritance.	Interface supports multiple inheritance.
3	3) Abstract class can have final, non-final, static and non-static variables.	Interface has only static and final variables.
4	4) Abstract class can have static methods, main method and constructor.	Interface can't have static methods, main method or constructor.
5	5) Abstract class can provide the implementation of interface.	Interface can't provide the implementation of abstract class.
6	6) The abstract keyword is used to declare abstract class.	The interface keyword is used to declare interface.

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The meaning of word Abstraction is the quality of dealing with ideas rather than events. Like if you want to call a number , you will pick your cell and will dial a number ,
you want be worried about how it will connect to servers and will connect to other persons cell or what network it is going to use ect.

like wise in OOPs Abstraction is a process of hiding the implementation details from the user,
only the functionality will be provided to the user. Means user will have the information on what the object does instead of how it does it.

In Java Abstraction is achieved using Abstract classes, and Interfaces.Possibly one source of confusion between Abstraction and an abstract class was that in the early days of OO,
inheritance was more heavily used to achieve code reuse (e.g. with associated abstract base classes).
Nowadays, composition is generally favoured over inheritance, and there are more tools available to achieve abstraction, such as through Interfaces, events / delegates / functions, traits / mixins etc

It is used for Supporting cross platform by changing the implementation per platform.

Possibly one source of confusion between Abstraction and an abstract class was that in the early days of OO,
inheritance was more heavily used to achieve code reuse (e.g. with associated abstract base classes).
Nowadays, composition is generally favoured over inheritance, and there are more tools available to achieve abstraction, such as through Interfaces, events / delegates / functions, traits / mixins etc

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