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Introduction to Class Programming

What is a Class

Many novice programmers when exposed for the first time in Object Oriented Programming tend to confuse classes and object. To aid the programmer about classes and object, this will give you some reminders. Your users will never see a class; rather, they will only see and act with objects created from your classes. As a programmer, your point of view is opposite because the thing you'll have in front of you while you're writing the application is the class, in the form of a class module. Until you run the application, an object isn't more real than a variable declared with a Dim statement in a code listing.

A class is a part of the program that defines the properties, methods and events of one or more object that will be created during execution. An object is an entity created at run time, which requires memory and some resources and is then destroyed when it's no longer needed or when the application end. In short, a class are design time only entities, while object are run-time entities. Or in more or less technical term

A class is a template or formal definitions that defines the properties of an object and the methods used to control that object's behavior. The description of these members is done only once, in the definition of the class. The object that belongs to a class, called instance of the class, share the code of the class to which they belong but contain only their particular setting for the properties of the class. Everything an object knows is expressed in its properties and everything it can do is expressed in its methods. Object interacts with each other by sending message requesting that method be carried out, or that properties be set or returned. A message is simply the name of an object followed by the name of one of its members.

Comments

  1. 26 Jun 2009 at 13:14

    Wouw, thanks for this great explanation on how to use and make classes. I always coded in VB with function in normal Modules, now i'm going one step further... Trying it out...

  2. 23 Jun 2009 at 10:37

    Great Tutorial !! Helped me a lot

  3. 07 Mar 2009 at 10:54
    This is great tutorial! Thank you sooooo much.
  4. 07 Jun 2008 at 11:55

    [quote user="Developer Fusion Bot"]

    This thread is for discussions of Introduction to Class Programming.

    [/quote]

    This was the best explanation to "class", I have ever come across. Hats off to you.

  5. 12 Jul 2007 at 12:36

    Hello Sir,

    I have just seen u'r examples for class module.u'r explaination is simply superb!!!!

    now i clearly understood the class module concept in VB.

     

    Thanks

    Bhavani Josyula

  6. 15 May 2007 at 16:10
    This was a very good fundamental article on the use of classes in VB. looking forward to additional more advance content
  7. 16 May 2006 at 11:35

    It s a great sample about the class programming. However, it s still uncertain for me where I can use this in real life.

    Can anyone give me an example ?

  8. 05 Oct 2005 at 19:12

    what kind of help you wants from me. i mean to clear out your visual basic basics by giving you some tutorials or anything else. bye

  9. 29 Sep 2005 at 12:25
    hello sir, can you teach me the visual basic programing and where to start because i don't have a basic in this software. before this, i was try to learn this programe from e_book but it's looking so hurt to learn without a teacher.
    I would appericiate if u can show me the way to learn this programe.
    TQ
  10. 16 Jul 2005 at 02:59
    Thanks, Dante Salvador, for your excellent and lucid tutorial on Class Programming.
    I have worn Google to a frazzle looking for help. most of which was comprised of a few samples.
    You have helped "elucidate" me with both the why and how-to and that is no small task.
    Thanks so much for your efforts and help.
  11. 09 Jun 2005 at 17:34

    What a tutorial !! man i like it. this tutorial shows me another side of visual basic wow!!

  12. 23 Dec 2004 at 13:40

    This is really a good tutorial on Visual Basic. I was really coinfused between let, get properties. But this is the final place which solved ll my problems

  13. 22 Oct 2003 at 11:52

    vbexplorer.com has also an excellent oop tutorial, if youre looking for some more,
    and I have found a german article at vbarchiv.de that seems very good (i can
    tell because I studied german when in grad. school, swe).


    Maybe I should try an translate it to english...

  14. 20 Sep 2003 at 06:32

  15. 10 Sep 2003 at 17:41
    At one time I studied programming in Pascal & Fortran --- have forgotten lots of basics....I have read thru many VB tutorials etc but never have I so clearly had the 'light bulb' go on.  Thank-you for a well organized presentation.  Look forward to your future articles.
  16. 01 Jan 1999 at 00:00

    This thread is for discussions of Introduction to Class Programming.

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Dante Salvador

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