Links on Java and Object Oriented Programming

http://math.hws.edu/eck/cs124/downloads/OOP2_from_Univ_KwaZulu-Natal.pdf

http://java.sun.com/docs/books/tutorial/java/concepts/

http://www.developer.com/java/ent/article.php/935351/The-Essence-of-OOP-Using-Java-Objects-and-Encapsulation.htm

http://www.javaworld.com/javaworld/jw-04-2001/jw-0406-java101.html

http://articles.sitepoint.com/article/oriented-concepts-java-1

http://www.cs.usfca.edu/~parrt/doc/java/OOProgWithJava-notes.pdf