Prasm:
Aqui tienes un enlace en ingles con una explicacion sobre los conceptos OOD donde, casualmente, los ejemplos son dados con Java:
Here is a link with an explanation of OOD concepts, where the examples just happen to be in Java
http://java.sun.com/docs/books/tutorial/java/concepts/
If what you want is a quick answer as to whether Java is an Object Oriented language, the answer is yes. If you want to know why, I encourage reading these concepts.
thanks