The 3rd edition of the well-known reference, Java in a Nutshell, covers the essential APIs of Java 1.2, including networking, security, input and output, and basic language and utility classes. Due to the size of the Java 1.2 API, graphics and graphical user interface classes are now examined in a volume called Java Foundation Classes in a Nutshell, and server-side and enterprise programming are detailed in Java Enterprise in a Nutshell.

Though primarily a reference, the book starts off with a thorough, fast-paced introduction to Java, exploring all the key topics, including syntax, object-oriented programming, security, beans, and tools. These discussions are brief and very information-dense, and if you are buying this book to learn the language, you will probably be overwhelmed by the speed of this initiation.

This book intends to document quite a bit of Java, and it easily succeeds with broad coverage of Java programming in Part I, and API cataloging broken down by package in Part II. For example, discussions in Part I explain Types, Reflection, and Dynamic Loading. The handling of these topics takes a little over a page, but the book gives a useful overview with code examples that clearly illustrate the points made. It is one of the clearest and most concise treatments of these three topics available.