本书主要讲授Java程序设计语言，系统地介绍Java的主要包(即java．1ang．*、java．ut1l和java．jo)中的大多数类，并以内容丰富的示例对这些类如何工作进行了深入剖析。作者对这部经典著作进行更新，使其反映了Java 2标准版5．0(J2SE 5．0)中主要的增强。本版中增加了一些新的章节，专门讨论泛型、枚举、注解、断言和正则表达式等J2SE 5．0中引入的强大语言新特性。此外，本书还强调了当今构建健壮、高效和可维护的Java软件的最佳实践。

本书对所有程序员(包括那些经验丰富的程序员在内)都是不可或缺的参考书。

1 A Quick Tour

1.1  Getting Started

1.2  Variables

1.3  Comments in Code

1.4  Named Constants

1.5  Unicode Characters

1.6  Flow of Control

1.7  Classes and Objects

  1.7.1  Creating Objects

  1.7.2  Static or Class Fields

  1.7.3  The Garbage Collector

1.8  Methods and Parameters

  1.8.1  Invoking a Method

  1.8.2  The this Reference

  1.8.3  Static or Class Methods

1.9  Arrays

1.10 String Objects

  1.10.1 String Conversion and Formatting

1.11 Extending a Class

  1.11.1 Invoking Methods of the Superclass

  1.11.2 The 0bject Class

  1.11.3 Type Casting

1.12 Interfaces

1.13 Generic Types

1.14 Exceptions

1.15 Annotations

1.16 Paqkages

1.17 The Java Platform

1.18 Other Topics Briefly Noted

2  Classes and Objects

2.1  A Simple Class

  2.1.1  Class Members

  2.1.2  Class Modifiers

2.2  Fields

  2.2.1  Field Initialization

  2.2.2  Static Fields

  2.2.3  final Fields

2.3  Access Control

2.4  Creating Objects

2.5  Construction and Initialization

  2.5.1  Constructors

  2.5.2  Initialization Blocks

  2.5.3  Static Initialization

2.6  Methods

  2.6.1  Static Methods

  2.6.2  Method Invocations

  2.6.3  Methods with Variable Numbers of Arguments

  2.6.4  Method Execution and Return

  2.6.5  Parameter Values

  2.6.6  Using Methods to Control Access

2.7  this

2.8  Overloading Methods

2.9  Importing Static Member Names

2.10 The main Method

2.11 Native Methods

Extending Classes

3.1  An Extended Class

3.2  Constructors in Extended Classes

  3.2.1.  Constructor Order Dependencies

3.3  Inheriting and Redefining Members

  3.3.1  Overriding

  3.3.2  Hiding Fields

  3.3.3  Accessing Inherited Members

  3.3.4  Accessibility and Overriding

  3.3.5  Hiding Static Members

  3.3.6  The super Keyword

3.4  Type Compatibility and Conversion

  3.4.1  Compatibility

  3.4.2  Explicit Type Casting

  3.4.3  Testing for Type

3.5  What protected Really Means

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