Java 4th Edition:权威指南，J2SE 5.0升级版

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"The Java Programming Language 4th Edition PDF 英文版" 是由Java语言的创建者Ken Arnold、James Gosling和David Holmes共同编写的经典之作，是JAVA编程领域中的四大名著之一。这本书于2005年8月由Addison Wesley Professional出版社发行，ISBN号为0-321-34980-6，共包含928页的内容，详尽地阐述了Java编程语言的各个方面。该书的核心目标是为初学者和高级程序员提供一个不可或缺的资源，帮助他们快速掌握Java语言的设计理念和实战应用。在第四版中，作者们对Java 2 Standard Edition 5.0 (J2SE 5.0)的主要增强进行了全面的更新，确保读者能够跟上Java技术的最新发展。本书详细讲解了Java主包中的核心类，如java.lang.*, java.util., 和 java.io., 深入剖析这些类的工作原理，并通过实例进行说明。特别值得注意的是，第四版新增了多个章节和主要内容，同时对所有章节进行了优化，以体现当今构建健壮、高效和易于维护的软件的最佳实践。读者将从书中了解到Java语言的基础语法、面向对象编程原则、异常处理、集合框架、输入输出流、网络编程等核心概念，以及如何利用Java进行并发编程、泛型和注解等J2SE 5.0的新特性。此外，作者们还提供了大量的实战案例和调试技巧，帮助读者提高编程技能并解决实际开发中的问题。对于任何想要深入理解Java编程语言或者寻求提升Java开发能力的开发者来说，《The Java Programming Language 4th Edition》是一本不可或缺的学习工具，它不仅覆盖了基础知识，还紧跟技术潮流，确保读者具备在现代开发环境中成功运用Java的能力。无论是初次接触Java的初学者还是经验丰富的开发者，都可以从中受益匪浅。

About This Book

This book teaches the Java programming language to people who are familiar with basic programming

concepts. It explains the language without being arduously formal or complete. This book is not an

introduction to object-oriented programming, although some issues are covered to establish a common

terminology. Other books in this series and much online documentation focus on applets, graphical

interfaces, Web sites, databases, components, and other specific kinds of programming tasks. For other

references, see "

Further Reading" on page 755.

This fourth edition provides integrated coverage of the Java programming language as provided by the

Java

™

2 Platform Standard Edition 5.0 and specified by the Java

™

Language Specification, Third Edition.

It also covers most of the classes in the main packages (

java.lang

java.util

java.io

) as implemented

in the

J2SE

™

Development Kit 5.0 (more commonly known as

JDK

5.0, or in the older nomenclature

JDK

1.5.0).

If you have already read the third edition of this book, you will find some major changes, both in the

language and the book, since the 1.3 release that the third edition covered. There are new chapters on

generics, enums, and annotationsthe major new language features introduced in the 5.0 releaseand

major new sections on assertions and regular expressions. Some existing material has been restructured

to accommodate other changes and to improve the general flow of the textsuch as introducing the new

boxing and unboxing conversions. But every single chapter has been updated in some way, whether it is

a new language feature like variable argument methods; the new enhanced

for

loop construct; a new

class such as

Formatter

for formatting text output; or changes to classes and methods caused by the

addition of generics (such as the collections utilities and the reflection classes)change permeates this

entire fourth edition.

The Java programming language shares many features common to most programming languages in use

today. The language should look familiar to C and C++ programmers because it was designed with C

and C++ constructs where the languages are similar. That said, this book is neither a comparative

analysis nor a "bridge" tutorialno knowledge of C or C++ is assumed. C++ programmers, especially,

may be as hindered by what they must unlearn as they are helped by their knowledge.

Chapter 1A Quick Tourgives a quick overview of the language. Programmers who are unfamiliar with

object-oriented programming notions should read the quick tour, while programmers who are already

familiar with object-oriented programming paradigms will find the quick tour a useful introduction to the

object-oriented features of the language. The quick tour introduces some of the basic language features

on which examples through the rest of the book are built.

Chapters 2 through 6 cover the object-oriented core features of the language, namely, class

declarations that define components of a program, and objects manufactured according to class

definitions. Chapter 2Classes and Objectsdescribes the basis of the language: classes. Chapter

3Extending Classesdescribes how an existing class can be extended, or subclassed, to create a new class

with additional data and behavior.

Chapter 4Interfacesdescribes how to declare interface types that are

abstract descriptions of behavior that provide maximum flexibility for class designers and implementors.

Chapter 5Nested Classes and Interfacesdescribes how classes and interfaces can be declared inside

other classes and interfaces, and the benefits that provides. Finally,

Chapter 6Enumeration Typescovers

the definition and use of type-safe enumeration constants.

Chapters 7 through 10 cover standard constructs common to most languages. Chapter 7Tokens, Values,

and Variablesdescribes the tokens of the language from which statements are constructed, the types

defined by the language and their allowed values, and the variables that store data in objects, arrays, or

locally within methods. Chapter 8Primitives as Typesexplores the relationship between the primitive

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About This Book

types and objects of their corresponding wrapper classes, and how boxing and unboxing can

transparently convert between them. Chapter 9Operators and Expressionsdescribes the basic operators

of the language, how these operators are used to build expressions, and how expressions are evaluated.

Chapter 10Control Flowdescribes how control statements direct the order of statement execution.

Chapter 11Generic Typesdescribes generic types: how they are written and used, their power, and their

limitations.

Chapter 12Exceptions and Assertionsdescribes the language's powerful error-handling capabilities, and

the use of assertions to validate the expected behavior of code.

Chapter 13Strings and Regular Expressionsdescribes the built-in language and runtime support for

String

objects, the underlying character set support, and the powerful utilities for regular expression

matching.

Chapter 14Threadsexplains the language's view of multithreading. Many applications, such as graphical

interfacebased software, must attend to multiple tasks simultaneously. These tasks must cooperate to

behave correctly, and threads meet the needs of cooperative multitasking.

Chapter 15Annotationsdescribes the annotation types used to document some of the extra-linguistic

properties of classes and method.

Chapter 16Reflectiondescribes the runtime type introspection mechanism and how you can construct

and manipulate objects of unknown type dynamically at runtime.

Chapter 17Garbage Collection and Memorytalks about garbage collection, finalization, and lower-

strength reference objects.

Chapter 18Packagesdescribes how you can group collections of classes and interfaces into separate

packages.

Chapter 19Documentation Commentsshows how to write reference documentation in comments.

Chapters 20 through 24 cover the main packages. Chapter 20The I/O Packagedescribes the input/output

system, which is based on streams. Chapter 21Collectionscovers the collection or container classes such

as sets and lists. Chapter 22Miscellaneous Utilitiescovers the rest of the utility classes such as bit sets,

formatted output, text scanning, and random number generation. Chapter 23System Programmingleads

you through the system classes that provide access to features of the underlying platform. Chapter

24Internationalization and Localizationcovers some of the tools used to create programs that can run in

many linguistic and cultural environments.

Chapter 25Standard Packagesbriefly explores the packages that are part of the standard platform,

giving overviews of those packages not covered in more detail in this book.

Appendix AApplication Evolutionlooks at some of the issues involved in dealing with the evolution of

applications and the Java platform, and the impact this has on some of the new language features.

Appendix BUseful Tableshas tables of information that you may find useful for quick reference.

Finally, Further Reading lists works that may be interesting for further reading on complete details,

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Acknowledgments (Fourth Edition)

Once again we are indebted to a group of people who took time out from their hectic schedules (and

even their own books!) to give us the benefit of their experiences in making this the best edition yet. Of

course, some of those people were also responsible for the huge volume of work required for us to catch

up with all the new language and library features, but we won't hold that against them. Much.

On the reviewing side our thanks go first to Yoshiki Shibata. Yoshiki produced the Japanese translation

of the third edition and in the process single-handedly discovered at least 85% of the errata. To get the

fourth edition as errata free as possible we knew we needed Yoshiki onboard as a reviewer very early

on. Yoshiki became our front-line reviewer and nothing went out for general review without his nod of

approval. Not only did he provide valuable corrections and feedback on the new material, he also

pointed out several areas where there had been language changes that we hadn't been aware of!

Brian Goetz also rates special thanks not only for reviewing the entire edition, but also for re-reviewing

various sections that took several iterations to get right. The turnaround times for these re-reviews were

very tight and we much appreciate Brian's time at that critical stage.

The remainder of the core reviewing team consisted of Beth Stearns and Kevin Davis, who were able to

stay for the long haul, while Bob Withers, Herb Jellinek, Ken Louden, Rich Wardwell, and Kevin

Hammond provided valuable feedback on the earlier portions of the text. Thank you all very much.

We'd also like to thank Tim Peierls for supplying the chess example used in the enum chapter; and Keith

Lea and Martin Buchholz for valuable reviews of the generics materialthanks!

It will come as no surprise to most that writing the generics chapter (and the related part of the

appendix) was the hardest part of this edition. Armed initially only with a draft of the third edition of the

Java Language Specification, it was never going to be easy to fathom the depths of the new type

system, so we brought in the big guns: Neal Gafter, Josh Bloch, Gilad Bracha, and Peter von der Ahé

were all instrumental in educating us about generics, and for that we thank them. Peter's in-depth

review of the generics chapter was especially valuable and warrants an additional thank you. Of course,

the teachers cannot be blamed for the shortcomings of the student, so any errors or omissions in the

description of generics are the sole responsibility of the authors. (We'd like to thank Phil Wadler for

catching two such omissions in the generics coverage just prior to publication.)

We'd also like to thank the following technical experts for their assistance in specific areas: Doug Lea for

reviewing the Java memory model material and providing assistance with concurrent collections; Brian

Goetz for checking the overview of the concurrent collections (in addition to everything else); Mike

"MadBot" McCloskey for the review of, and assistance with, the use of the

Scanner

class and the

associated regular expression usage; and Jeremy Manson for trying to explain the unfathomable

relationship between finalization and the memory model.

Rosemary Simpson seems to always manage to be around when we need her. It's starting to get

difficult to find a creative way to say how much we appreciate her indexing, but I'm sure we'll have one

by the fifth edition.

On the production side, the path to the fourth edition was a somewhat changeable one. Mike

Hendrickson held the reins when the fourth edition was conceived, then handed the reins to Ann Sellers.

Ann, with assistance from Ebony Haight, saw the fourth edition through its early gestation, then handed

the reins to Greg Doench. Greg, with assistance from Noreen Regina, Stephane Nakib, Tyrrell Albaugh,

Elizabeth Ryan, and Mary Lou Nohr saw us through to the ultimate delivery. Thank you all, and to all

those behind the scenes.

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