If you are interested in OOP programming I suggest:

Design Patterns: Elements of Reusable Object-Oriented Software

This book is written by the Gang of Four (Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides) and is very highly praised. It is a great book if you need to use patterns in your code ... which most of us do.

Note, it's written for C++ and some Smalltalk but you can apply it to just about any OO language. It's a great reference book in general.

Hope that this helps ....

Ducati

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"We rock the body to rock the party ... until the party rocks the body"

De La Soul