Rogers Cadenhead is a web application developer and author. He has written 22 books on Internet-related topics, including Sams Teach Yourself Java in 24 Hours. He’s also a web publisher whose sites receive more than 24 million visits per year. He maintains this book’s official website at http://www.java21days.com and a personal weblog at http://www.cadenhead.org.

Laura Lemay is a technical writer and author. After spending six years writing software documentation for various computer companies in Silicon Valley, she decided that writing books would be much more fun. In her spare time, she collects computers, email addresses, interesting hair colors, and nonrunning motorcycles. She is also the perpetrator of Sams Teach Yourself Web Publishing with HTML in a Week and Sams Teach Yourself Perl in 21 Days and a personal weblog at http://blog.lauralemay.com