本书主要讲述了Java 2复习的重点及其应掌握的知识点，同时书中还附有大量的模拟试题，以供考生自测使用。该书内容丰富，实用性强，是一本较为优秀的Java 2复习辅导用书。

Introduction

Chapter1 Declarations and Access Control

Chapter2 Flow Control and Exception Handling

Chapter3 Garbage Collection

Chapter4 Language Fundamentals

Chapter5 Operators and Assignments

Chapter6 Overloading，Overriding，Runtime Type，and Object Orientation

Chapter7 Threads

Chapter8 The java.awt Package

Chapter9 The java.lang Package

Chapter10 The java.util Package

Chapter11 The java.io Package

Appendix A The Certification Initiative for Enterprise Development

Glossary

When a local variable goes out of scope，it becomes inaccessible and therefore is no longer a valid reference to an object. Thus，it doesn't explicitly require setting to null.