SCJA materials

Essence of OOP Using Java Inheritance - By Richard G. Baldwin @ Developer.com http://www.developer.com/java/other/article.php/948121

http://java.sun.com/developer/technicalArticles/releases/j2se15/
http://java.sun.com/docs/books/tutorial/index.html

Object-Oriented Thought Process - By Matt Weisfeld @ Developer.com http://www.developer.com/tech/article.php/3304881

Some Object-Oriented Design Principles - By Bob Tarr / University of Maryland Baltimore County http://www.research.umbc.edu/~tarr/dp/lectures/OOPrinciples-2pp.pdf