Java语言编程通过JDOM实现与SQLServer数据库数据的连接和数据读取操作-Java Programming Language Implementation and SQLServer database through the JDOM data connection and data read operations

或许我们在学习语言后就是想运用一下自己的编程技能，这是一个可以实现基本功能的计算器，也是体现对java语言的学习检验-Maybe we just want to learn the language to use your own programming skills, this is a basic function calculator can also reflect on the java language learning test

Math 类库，包含了Java 语言基础类库中没有的数学、统计学相关的基础工具。-Commons Math is a library of lightweight, self-contained mathematics and statistics components addressing the most common problems not available in the Java programming language or Commons Lang.