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用windowbuilder构造一个计算器，主要用于四则运算，可以清除数据。(With windowbuilder construct a calculator, mainly for the four arithmetic, you can clear the data.)

beetl是新一代模板引擎，比常见的Java服务端模板引擎都优秀(Beetl is a new generation of template engines, better than the common Java server-side template engines)

java学习资料，内附源码学习交流。java开发环境(java learning materials, enclosing the source learning exchanges.code)

根据获取到的数据导出到Excel表格中，列名固定，项目名称动态循环输出(According to the data obtained, it is exported to Excel table with fixed column name and dynamic circular output of project name.)

Java微软Access工具，用于读取或创建微软Access数据库文件，支持1997-2019全部版本。(Java Microsoft Access tool, used to read or create Microsoft Access database files, supporting all versions of 1997-2019.)

安卓上的蓝牙串口助手，包含源代码，可以和单片夹等其他的设备相连。(Bluetooth serial port on Andrews assistant, including source code, and other devices can be connected to single folders.)

说明：  前端预览文件，解压使用注意要修改读取文件路径，使用前安装openoffice4程序，应用程序安装地址要和demo中地址匹配(Front-end preview file, decompression attention should be paid to modify the read file path, install OpenOffice 4 program before use, application installation address to match the address in demo)

百度地图嵌入的经典例子，适合学习地图嵌入的同学使用。(Baidu map embedded in a classic example, is suitable for the students to use embedded learning map.)

This class represents a currency as identified in the ISO 4217 currency codes.

说明：  java书籍ppt 里面有很多教程 值得参考使用(There are many tutorials in Java books worth referring to.)