what is the difference between MVC Model and 3-tier app ?

[ahmed17]

what is the difference between MVC Model and 3-tier app ?

[dlorde]

Try Googling for each, and come back if you have some more specific Java questions.

The truth is, when all is said and done, one does not teach a subject, one teaches a student how to learn it. Teaching may look like administering a dose, but even a dose must be worked on by the body if it is to cure. Each individual must cure his or her own ignorance...
J. Barzun.

[ahmed17]

each model try to separate code into 3 classes one for db layer, one for presentation (view ) and one of business operations so what is the difference?

[dlorde]

each model try to separate code into 3 classes one for db layer, one for presentation (view ) and one of business operations...

Three layers, not classes.

so what is the difference?

You basically described a 3-tier app. The MVC concept is more generic, so a 3-tier app could be considered an instance of MVC. Here is a useful link: Java App Design with MVC.

All models are wrong; some models are useful...
G. Box

[ahmed17]

Thanks.