When you need quick help writing Java programs, consult the Addison-Wesley Java Backpack Reference Guide. This is a quick reference to the most commonly used keywords and APIs in the Java programming language. The book is easy and simple to use and includes syntactic examples, keyword descriptions, and helpful notes. This inexpensive reference book contains a lot of information for both people who are just starting to program in Java and for professionals who want to have all the necessary information at hand.