About the Author

David R. Heffelfinger has been developing software professionally since 1995; he has been using Java as his primary programming language since 1996. He has worked on many large-scale projects for several clients including Freddie Mac, Fannie Mae, and the US Department of Defense. He has a Masters degree in Software Engineering from Southern Methodist University. David is editor in chief of Ensode.net (http://www.ensode.net ), a website about Java, Linux, and other technology topics.