Complete Java 2 Certification Study Guide by Simon Roberts, Philip Heller, Michael Ernest . The lead author of Sybex's Java 1.2 Certification Study Guide actually developed the exams for Sun. Roberts was the key player in the concept, strategy, and implementation of the test guidelines, and also developed the questions. The Study Guide is organized according to the exam objectives defined by Sun.
Every single objective is covered, reinforced with sample questions and annotated answers.
The book has a stamp of approval from the Sun Education Team, and includes a CD with an exclusive Java exam test engine. It's devoid of shaky, academic examples and packed with robust demonstrations that illustrate hundreds of powerful concepts. This book begins with an explanation of the Java programming and execution environments in general terms and then provides specific examples of how to put key parts of the core packages to work. The authors back up the many examples with sharp, fact-rich commentary on how to get things done with Java. In this book, you will find comprehensive coverage of the Java Virtual Machine class file format and instruction set.