can we say an interface is an abstract class?

[Praveen palukuri]

hi,
please reply for this query :
can we say an interface is an abstract class?

Thank you.

[Ilja Preuss]

No.

[Paul Sturrock]

No. You can extend an abstract class to create a concrete implementation, but you can only extend an interface to make another interface. You could describe interfaces as "abstract" things though, since they in themselves provide no implementation.
[ April 20, 2006: Message edited by: Paul Sturrock ]

[Jesper de Jong]

Praveen, the question "what is the difference between an interface and an abstract class" is a frequently asked question on the forums here. If you do a search, you'll find lots of threads with useful answers to the question.

[faisal usmani]

Dear Praveen ,

To add a little more to what Paul said, An abstact class can have some concrete methods besides abstact methods in it where as interface will always have abstract methods only , there are so many other differences. Do a little google or you can read Head First by K&B.



regards