As you have found, it is easy and fun to program using JAVA. JAVA is simple, yet very big. You can use many of the available classes just as they are without any changes. And above all its open source, secure and free. This web quest didn't cover anything but the very basics of JAVA and how it works, if desired to learn JAVA I would recommend the following book.
Introduction to Java Programming, Brief Version, 9/E
Y. Daniel Liang, Armstrong Atlantic State University
Publisher: Prentice Hall