Can anyone recommend any book to go along with this app?

Answer 1

Check out the O'Reilly series for Java at shop.oreilly.com

They do a great job at explaining advanced java and introductory material.

Answer 2

Big java (Cay horstmann), Effective Java.

Answer 3

Java for dummies is one, not seen yet.

Answer 4

Thinking in Java 4th edition and head first Java 2nd edition :D

Answer 5

murachs programming java with eclipse