Basically it’s an introduction to Object-Oriented Programming written by Java experts. It’s a delight for programmers though since the tutorials mainly focus on the concept of the OO Programming rather than specific language syntax. Covers most of the topics in OOP including interfaces.
I guess the site can describe itself better than I can:
The Object Oriented Programming Web publishes FREE programming and computer science tutorials, lecture notes, course slides and e-books. OOPWeb.com is a great resource for all programmers and computer science students, but it’s especially popular among those who are interested in C++, Java and Object Oriented Programming.
The tutorial is relatively short and can be skimmed pretty quickly (hey! that’s a plus point for us lazy coders). Mainly deals with the different types of relations between objects, their lifestyles and soap operas (okay, cancel the last one). Has some neat and easy-to-understand examples (cars and pizzas).
This article from Exforsys Inc. is what you really want. It’s language independent and although sometimes it bends towards technical terms, it is relatively easy to understand. P.S. I first thought the site name was Exorcist (dyslexic? hmm).
I don’t know about you but I really liked Tony’s series of articles about Object-Oriented Programming. It’s really meant to be Newbie-Object-Oriented-Programming (NOOP? I thought it would be noob). The author puts some really neat examples to make sure that everyone can understand the basic concept of Object-Oriented Programming.
Object Oriented Programming with PHP by Kevin Waterson
I know some guys get upset seeing the wealth of information scattered around the web but none of them giving suitable explanations. Well, Kevin is one of them then. This guy probably packed a whole book into one complete page explaining all the important concepts of OOP and also for us lucky web developers, he has written the article using PHP! He discusses advanced topics like Autoload, Overloading, and Class Constants. MUST READ.
And boy didn’t we see the effect in full or what? This article is a whopping huge post of detailed information about the PHP OOP features. Yes sirree it is not language dependent article but WTH (notice: I didn’t use WTF…I think I just did). So get some cups of 100% caffeinated coffee and start gaining vital knowledge about OOP.