When should I use abstract classes and when should I use interfaces?

When should I use abstract classes and when should I use
interfaces?

Question Posted / usha

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When should I use abstract classes and when should I use interfaces?..

Answer / ved.b.tripathi

Interface : when you about to maintain the standard through
out the application then,blindly go with the interface.

Abstract : when you customize the behavior but still want to
maintain some standard then use abstract,because in abstract
you can have non abstract method that will be use by every
class that extend this abstract method and that class also
have to give the body of abstract methods(standard).

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When should I use abstract classes and when should I use interfaces?..

Answer / ankit

if u r required more than 1 class in ur prog then use
interface because u cant extends 2 class in ur prog ...to
use 2 class in ur prog u can implement 1 interface and
extends 1 class

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1 No

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