Java Cookbook

In this GOTO Book Club, Java Champion Jeanne Boyarsky interviews Ian F. Darwin — author of one of Java's most enduring reference books, Java Cookbook, now in its fifth edition covering up to Java 25. The conversation traces Ian's extraordinary journey: from writing Java's first commercial training course outside of Sun Microsystems, to meeting Tim O'Reilly at a Unix conference and handing him a chapter on lint, to delivering a class in Houston where the entire room had just been laid off and were using the course as their golden handshake into a new career. Ian talks about the philosophy behind the book — culling a peak 900-page beast down to a tight 600 pages, anchoring tool choices on proven, battle-tested picks like JUnit, Mockito, and logging — and shares his three favourite chapters: Regular Expressions, Object-Oriented Techniques, and Reflection.

The conversation gets sharply honest about AI and the future of the industry. Ian — who uses Claude as his coding assistant and does vibe code — warns that his greatest fear isn't AI taking over the world, but something subtler and more dangerous: companies stopping junior hires because AI can do the work, leaving no one to grow into the deep expertise that retires with the current generation. The parallel risk for books is equally candid: AI was trained on older editions, so the fifth edition is genuinely new and un-scraped territory.

His advice for anyone who has learned the basics of Java?
Don't ask an AI — buy the cookbook, save yourself years of trial and error, and for goodness' sake, read the code before you deploy it. "It's like building an airplane and putting passengers on it without flight testing."