说明：  本书是关于作为一名java开发者，如何做好经常会遇到的普通的任务。纵观 全书，我们会研究一些核心语言特性，比如线程和内存管理，这些会对java应用的专业程度影响比较大。
(This book is about how to do well as a java developer. Throughout the book, we'll look at some of the core language features, such as threading and memory management, that have a greater impact on the professionalism of Java applications.)