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Rogers Cadenhead is a programmer and author. He has written more than 20 books on programming and web publishing, including Sams Teach Yourself Java in 24 Hours. He also publishes the Drudge Retort and other websites that receive more than 20 million visits a year. He maintains this book’s official website at www.java21days.com and a personal weblog at http://workbench.cadenhead.org.