Java Programming Guide by Elizabeth Williams

In this book each chapter consists of several “items” presented in the form of a short, standalone essay that provides specific advice, insight into Java platform code examples. The comprehensive descriptions and explanations for each item illuminate what to do, what not to do, and why.
This book comes with

-Techniques and best practices on classic topics, including objects, classes, libraries, methods, and serialization
-How to avoid the traps and pitfalls of commonly misunderstood subtleties of the language
-Focus on the language and its most fundamental libraries: java.lang, java.util, and, to a lesser extent, java.util.concurrent and java.io