能够为《Java并发编程实践》中文版书写序言，我深感荣幸。

一年前，当这本书首次出版发行的时候，我们曾经写道“多核处理器正变得越来越便宜，足可以用于中端桌面系统了”。现在看来，多处理器系统正变得越来越便宜这一趋势还在继续，如果有什么不同，只是愈演愈烈了。几乎所有主要的计算机生产厂商都在初级笔记本电脑和台式机中加入了多核处理器特性，而在服务器级别的机器上，每个处理器的内核数量也多于去年的内核数量。事实上，寻找出单处理器的系统正变得越来越难了。

这些硬件的发展趋势使软件的开发者面临着严峻的挑战。我们不能满足于仅仅在新的CPU上运行现有的程序，使它们跑得更快；如果我们想要发挥全新的处理器的能力，就必须编写程序来支持并发环境。在做这件事的过程中，会在架构、编程和测试方面遇到重大的挑战。而本书的目的就在于：为了让你能够应付这些挑战，书中提供了技术、模式和工具，可以用来分析并发编程以及降低封装并发交互的复杂性。

现在，与以往任何时候相比，“并发”与每一位Java开发者都更加息息相关了。我们很高兴地看到，在中国有几十万的Java程序员将会成为本书的读者。

Brian Goetz

2007年2月于Williston, VT

Preface to the Chinese Edition

It is a great honor to be able to introduce the Chinese edition of Java Concurrency in Practice.

When this book was first published, one year ago, we wrote that "multicore processors are just becoming inexpensive enough to appear in midrange desktop systems."  Now we see that this trend towards cheap multiprocessor systems has continued, and if anything, accelerated. Entry-level laptops and desktops from nearly every major computer manufacturer feature multi-core processors, and server-class machines are featuring even more cores per processor than they were last year. Indeed, it is getting hard to find single-processor systems.

These trends in hardware pose significant challenges for software developers.  No longer can we just run our existing programs on new CPUs and have them run faster; our programs must be written to support concurrent environments if we want to take advantage of the power of newer processors.  And doing so presents significant architectural, programming, and testing challenges.  It is the goal of this book to respond to these challenges by offering techniques, patterns, and tools for analyzing concurrent programs and for encapsulating the complexity of concurrent interactions.

Concurrency is now more relevant than ever for Java developers.  We are pleased that the audience for this book now includes the hundreds of thousands of Java programmers in China.

Brian Goetz

Williston, VT

February 2007