why we use abstract clases?

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why we use abstract classes if we can not create its instants.what is the purpose of creating abstract classes

Posted 17-Feb-12 2:39am

m_kashifzafar

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Philippe Mori 17-Feb-12 8:59am

If you want to do programming, you should learn to uses Google as a lot of thing are already well explained.

5 solutions

Solution 1

Read this:

Introduction to Object Oriented Programming Concepts (OOP) and More[^]

hope it helps :)

Posted 17-Feb-12 2:50am

Uday P.Singh

Solution 2

Depending upon the language implementation, there will be several answers to this question. However, while you can not create a specific instance of a virtual abstract class, you will be able to creat an instance of a class that inherits from that abstract class. Your instance now encapsulates the abstract class and all public and protected methods are available to use. It is this encapsulation that provides for software reuse and will enhance the class library's use.

Try to Google for more information on class library design. :)

Posted 17-Feb-12 2:54am

Chris Meech

Solution 4

Because abstractions are useful, as in real life.
Consider a product. A product is an abstraction. However you don't buy a product, you buy instead an tablet, but.. Hey, that is another abastraction, you don't really buy a tablet, you buy instead that very particular tablet you have choosen. Neverthless, you don't think 'product' or 'tablet' concepts are purposeless, do you?
If you really don't like metaphors (or tablets) then have a look at "Abstract Class versus Interface"[^] CodeProject article.

Posted 17-Feb-12 3:00am

CPallini

Solution 5

http://mycodelines.wordpress.com/2009/09/01/in-which-scenario-we-use-abstract-classes-and-interfaces/[^]

Posted 17-Feb-12 3:04am

Sanjay K. Gupta

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Philippe Mori · Accepted Answer · 2012-02-17T02:55:00

For this kind of question Google would be a far better solution.

Why we uses abstract classes[^]

Learn This: When to use an Abstract Class and an Interface[^]

By the way, any good book on object-oriented programming should help you understand the purpose and use of abstract classes.

Generally, one would prefer interfaces to abstract classes as they are more separated from the implementation in the sense that it is much easier to reuse an interface for different classes that to reuse an abstract class particulary if the class already has a parent.

But in some cases when the class should be the base class of a family of related classes, it does make senses to uses abstract classes as it would be possible to share part of the implementation.

You cannot instantiate an abstract class but you instantiate a class that derive from one provided that you have overwrote any abstract method. This is pretty basic OOP. It allows polymorphism.