深入探索Java™6平台

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"Apress Java 6 Platform Revealed" 是一本由John Zukowski编著的书籍，专注于介绍Java 6（代号Mustang）的新特性。本书旨在快速引导读者了解Java SE 6（标准版）的新功能集。Java 6是Java平台的重要版本，它带来了许多改进和新特性，以提升开发效率和应用程序性能。以下是一些关键知识点： 1. **改进的编译器**：Java 6引入了更智能的编译器，称为“Client Compiler”和“Server Compiler”。Client Compiler优化了桌面应用的启动速度，而Server Compiler则在运行时提供更好的性能。 2. **Java语言增强**： - **自动装箱与拆箱**：自动装箱允许基本类型与对应的包装类之间无缝转换，减少了代码量和潜在的NullPointerException。 - **枚举类型**：Java 6中的枚举是一种更安全的常量表示方式，可以避免类型安全问题，支持方法和变量，以及实现接口。 - **泛型的改进**：对泛型的处理更加完善，包括通配符和类型推断，使代码更具可读性和安全性。 3. **动态语言支持**：Java 6添加了JSR 223（Scripting for the Java Platform），使得其他动态语言如JavaScript、Ruby等可以在Java环境中运行。 4. **NIO.2**：Java 6扩展了非阻塞I/O（New I/O）框架，提供了更高级别的文件系统操作和异步I/O API，增强了网络编程的能力。 5. **Swing和GUI改进**：JDBC 4.0的增强，包括自动加载驱动和更强大的JDBC API。此外，Swing组件和布局管理器得到了更新，提高了图形用户界面的用户体验。 6. **Java Database Connectivity (JDBC)**：JDBC 4.0引入了自动发现数据库驱动、连接池改进和更强的异常处理机制。 7. **改进的垃圾收集**：Java 6改进了垃圾收集算法，尤其是并行和并发收集器，以减少停顿时间和提高整体性能。 8. **JMX增强**：Java Management Extensions (JMX) 提供了更好的监控和管理工具，便于开发者管理和监控应用程序的运行状态。 9. **Java运行时诊断工具**：JConsole和VisualVM等工具的增强，提供了更直观的性能分析和内存泄漏检测。 10. **国际化和字符集支持**：增加了对更多字符集的支持，改进了国际化和本地化处理。 11. **安全管理**：Java 6的安全模型进行了加强，提供了更细粒度的权限控制和安全策略。 "Apress Java 6 Platform Revealed" 是一本深入探讨Java 6新特性和技术细节的指南，对于想要了解和利用Java 6新功能的开发者来说，是一份宝贵的参考资料。书中的内容涵盖了从语言语法到平台工具的广泛领域，旨在帮助读者更好地理解和利用Java 6的全部潜力。

Introduction

So you like living on the bleeding edge and want to learn about Java 6, aka Mustang.

Welcome. What you hold in your hands is a look at the newest features of the early access

version of Mustang. Working through the early access releases from Sun, I’ve painfully

struggled through the weekly drops and demonstrated the latest feature set to help you

decide when or if it is time to move to Java 6. OK, maybe it wasn’t that painful. In any

case, many of these new features make the transition from Java 5 (or earlier) to Java 6

the obvious choice.

Who This Book Is For

This book is for you if you like diving headfirst into software that isn’t ready yet, or at least

wasn’t when the book was written. While writing the material for the book, I assumed

that you, the reader, are a competent Java 5 developer. Typically, developers of earlier ver-

sions of Java should do fine, though I don’t go into too many details for features added

with Java 5, like the enhanced for loop or generics. I just use them.

How This Book Is Structured

This book is broken into ten chapters and one appendix. After the overview in Chapter 1,

the remaining chapters attack different packages and tools, exploring the new feature set

of each in turn.

After Chapter 1, the next few chapters dive into the more standard libraries. Chapter 2

starts with the core libraries of

java.lang and java.util. Here, you get a look at the new

console I/O feature and the many changes to the collections framework, among other

additions. Chapter 3 jumps into updates to the I/O, networking, and security features.

From checking file system space to cookie management and beyond, you’ll explore how

this next set of libraries has changed with Java SE 6.0. Onward into Chapter 4, you’ll learn

about the latest AWT and Swing changes. Here, you’ll jump into some of the more user-

visible changes, like splash screen support and system tray access, table sorting and

filtering, text component printing, and more.

With the next series of chapters, the APIs start becoming more familiar to the enter-

prise developer; though with Mustang, these are now standard with the Standard Edition.

6609FM.qxd 6/27/06 6:09 PM Page xv

Chapter 5 explores the JDBC 4.0 additions. You’ll just love the latest in database driver

loading that Mustang offers, among the many other additions for SQL-based database

access. The latest additions related to XML come out in Chapter 6, with the Java Architec-

ture for XML Binding (JAXB) 2.0 API, the XML Digital Signatures API, and the Streaming

API for XML. Chapter 7 then moves into web services, but with a twist, since Mustang is

the client side—so you aren’t creating them, but using them.

Onward to the next semi-logical grouping, and you’re into tools-related APIs. Reading

Chapter 8, you get a look into the Java Compiler API, where you learn to compile source

from source. From compiling to scripting, Chapter 9 talks about Rhino and the JavaScript

support of the platform, where you learn all about the latest fashions in scripting engines.

The final chapter, 10, takes you to the newest annotation processing support. From all

the latest in new annotations to creating your own, you’re apt to like or dislike annota-

tions more after this one.

The single appendix talks about Mustang’s early access home at

https://mustang.dev.

java.net, the licensing terms, and the participation model. It may be too late by the time

this book hits the shelf, but early access participants have been able to submit fixes for

bugs that have been annoying them since earlier releases of the Java platform. Sure, Sun

fixed many bugs with the release, but it was bugs they felt were worthy, not necessarily

those that were critical to your business.

By the time you’re done, the Java Community Process (JCP) program web site

(

www.jcp.org) will be your friend. No, this book isn’t just about the JSRs for all the new fea-

tures—but if you need more depth on the underlying APIs, the JCP site is a good place to

start, as it holds the full specifications for everything introduced into Mustang. Of course,

if you don’t care for all the details, you don’t need them to use the APIs. That’s what this

book is for.

Prerequisites

This book was written to provide you, the reader, with early access knowledge of the

Java 6 platform. While the beta release was released in February 2006, that release was

based on a weekly drop from November 2005, with further testing. Much has changed

with the Java 6 APIs since then. By the time the book went through the production

process, most of the code was tested against the late May weekly snapshots from

https://mustang.dev.java.net, drops 84 and 85. There is no need to go back to those

specific drops—just pick up the latest weekly drop, as opposed to using the first beta

release. If there is a second beta, that is also probably a good place to start, though it

will be newer than what I tested with, and thus could have different APIs.

■INTRODUCTIONxvi

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