Java versions
I generally rely on the Sun implementation of Java as a reference when determining whether behavior is correct.
This book focuses on and is tested with Java 2, JDK 1.4. If you need to learn about earlier releases of the language that are not covered in this edition, the first edition and second editions of the book are freely downloadable at www.BruceEckel.com and are also contained on the CD that is bound in with this book.
