Normal class vs Abstract class vs Interface

Posted Date: 01 Jul 2009	Resource Type: Articles	Category: General
Author: ismail	Member Level: Bronze
Rating:	Points: 5

I have read many articles about normal class vs abstract class vs interface class I think i m cleared now on the difference b/w these 3. I think many of you also cleared about this concept but the real test for all of us is where to use them. When to use which one. I try my best to elaborate these concepts.

First i am going to define the basic definition of these three concept.

Normal class:

Normal class have definition of functions and variables and their
declaration as well.

Abstract class:

Abstract class have function and variables with definition
and declaration as well like the normal classes.
We can not make instance of Abstract Class.

Interface class:

Interface class have functions and variables with only definition.
We can not make instance of Interface Class.

Now a million dollar question when to use these classes?

Lets take an example

A Content management system for Media, Media is a generalize form of TV,
RADIO & NEWSPAPER

MEDIA

*
TV
*
RADIO
*
Newspaper

Now the decision time

Should we make an instance of Media?

If yes then use normal class

else if no then use either abstract or interface class

if media have function let's say schedule() and it have some
default behavior
then use abstract class

else if every derived class have its own definition of schedule()
use interface class


abstract Class media

{

    function abstract schedule()

  { 
     /*default schedule behaviour*/

  }

}


interface Class media

{

   function schedule();
}

Interface class can give you multiple inheritance where abstract cannot.

Abstract class is faster then interface class because interface requires
extra in-direction.

the major draw back of interface class is that you have to define the
functionality in every derived class when every any function added in base
class other wise it will give an error.

Give you feedback on this article and give more examples on this topic

For more details, visit http://hubpages.com/hub/Normal-class-vs-Abstract-class-vs-Interface-class

Responses

No responses found. Be the first to respond and make money from revenue sharing program.

Feedbacks

Popular Tags

What are tags ?

Search Tags

Objects . Normal class . Interface . Classes . Abstract class .

Post Feedback

This is a strictly moderated forum. Only approved messages will appear in the site. Please use 'Spell Check' in Google toolbar before you submit.
You must Sign In to post a response.

	Next Resource: Java vs Javascript
	Previous Resource: ASP.Net Interview question
	Return to Discussion Resource Index
	Post New Resource
	Category: General

Post resources and earn money!

Related Resources