topic interface and abstract class in Application Development and Automation Discussions

interface and abstract class

Former Member — Fri, 20 Feb 2009 08:16:05 GMT

Hi to all ,

could you please tel me wt is the deference between interface and abstact class .

technicaly , there seem to be no deference as there is no implementaion part in both cases .

regards ,

kiran

Re: interface and abstract class

Former Member — Fri, 20 Feb 2009 08:44:31 GMT

See the link below where you have the exact difference between two:

http://java.ittoolbox.com/groups/technical-functional/java-l/what-is-the-difference-between-interface-and-abstract-class-1536381.

Regards,

Rahul

Re: interface and abstract class

Sm1tje — Fri, 20 Feb 2009 08:53:20 GMT

Abstract classes sure do have implementation parts. Just double click on a method and you will be forwarded to the method implementation. However, you can not create an instance of these classes. These classes do have instance methods though, which can only be accessed after creating a subclass instance of this class. Good example are the RTTI classes CL_ABAP_TYPEDESCR and its subclasses.

An interface is something totally different. It's true that these do not have an implementation part on their own. Interfaces can be used (implemented) by other classes. Per class, you can than double click on a method, and create your own implementation.

Re: interface and abstract class

keerthy_k — Fri, 20 Feb 2009 09:28:54 GMT

Hi Kiran,

Abstract class : Will have atleast one method which is abtract. That means it can have some methods with implementation. If there is atleast one method without implementation, then that class will be an abtract calss. Also abtract classes cannot be instanciated. This means we cannot create the insatnce of an abtract class. Like- create object obj_name type ref to non_abstarct_calss.

Interface : Will have only abtract methods. And the intrefaces can be instanciated.

Keerthi.

Re: interface and abstract class

Former Member — Fri, 20 Feb 2009 12:08:18 GMT

i got cleared now . Thanks alot to all.