Exactly where we should use INTERFACE & where ABSTRACT Class

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Please explain exactly where we should use Interface and where to use Abstract Class. Great if you provide practical implementation.

Posted 6-Aug-13 18:23pm

Pramod009

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-08-06T18:36:00

Please see my past answers:
When we use abstract and when we use interface...?[^],
Difference between abstract class and interface if they have same no of methods and var[^],
How to decide to choose Abstract class or an Interface[^],
Interfaces and Polymorphism[^],
How to realize interface?[^].

—SA

Sarabjot Singh Makkar · Answer 2 · 2013-08-06T18:32:00

Solution 1

Hi,

The main difference between the abstract and interfaces are

We use Abstract classes in the case where we want that the child class must override all the functions of the parent class.

But in the case of Interface this is not necessary i.e if we do not want to override any function of parent class we can declare interface and inherit our class from it.

Posted 6-Aug-13 18:32pm

Sarabjot Singh Makkar

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PIEBALDconsult 7-Aug-13 0:44am

"must override all the functions of the parent class"

Untrue.

Sarabjot Singh Makkar 12-Aug-13 23:36pm

sir it is untrue in the case if the derived class is also an abstract class and i am assuming that the child class is normal child class

somnathdgaikwad · Answer 3 · 2013-08-06T19:32:00

Abstract class : Doesn't allow to create the instance.
Provides basic functionality.
Reuse of code.
Can be used to consolidate and share functionality
e.g.Animal is abstract type and cat,dog,pig are concrete types.

Interface : Doesn't contain any logic.
Specifies type also.
Provides common functionality shared by different instances.

Exactly where we should use INTERFACE & where ABSTRACT Class

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