RE: [PHP-DEV] Aggregation, Multiple Inheritence, pros/cons

> Could you please explain how interfaces promote code reuse? > I am not the perfect java pro, and as I understand it, > interfaces define a set of instance variables and methods that > must be there in order to be compliant to an interface, but > provide to way to import an implementation of such an interface > into an existing class. Interface provide standart ways to import/use modules inside a project and/or an existing applications. A good introduction of interfaces is the IDL format ( dynamicly generated from a dll/tlp in COM by ex. ). I believe that is nothing to do with code reuse, but specifically binary modules reuse. That makes developer's life easier and provides a multi-langage support for modules import, in this case that promotes code reuse, but that s not make the code reusable. A good definition is available in the msdn site somewhere in COM introduction ;).