一、Java代码约定
语法告诉我们what code it is possible to write—what the machine will understand，而约定（style、conventions）告诉我们what you ought to write—what the humans reading the code will understand.
按照一致、简单的约定写出的代码，将是maintainable, robust, and contain fewer bugs.
为什么需要约定，Sun给出的原因有：
- 80% of the lifetime cost of a piece of software goes to maintenance.
- Hardly any software is maintained for its whole life by the original author.
- Code conventions improve the readability of the software, allowing engineers to understand new code more quickly and thoroughly.
编写Java代码常用的约定有两个：
二、TIOBE Coding Standard Methodology和Jacobe
see：http://www.tiobe.com/tpci.htm
代码美化工具：Jacobe，缺省包含了一个完全按照Sun的代码规范的格式化配置文件。 
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