OPfile

说明：  基于WHO PEN干预的慢性病管理信息系统，普通的增删改查功能(The chronic management information system based on the WHO's intervention, the general increase and delete function)

这是一个java编写的航空订票系统,很好的哦,(This is a Java code airline reservation systems, very good oh,)

一个简单的JAVA应用，可以通过身份证号查询个人信息，包括出生年月，出生地，性别等。(A simple Java application, you can query ID personal information, including date of birth, place of birth, gender, and so on.)

超市管理系统，可以进行买卖货物，以及库存的统计(Supermarket management system, you can buy and sell goods, as well as inventory statistics)

一些基本的枚举的用法例子介绍，程序都可以运行的，开发的工具是eclipse(Usage examples to introduce some basic enumeration, the program can be run, the development of tools is the eclipse )

报刊订阅管理系统,代码和报告都在里面 完整的，需要的可以下载参考(baokandingyueguanlixitong wanzhengziliao )

创建一个类，提供与java .lang.Math同名的所有方法，但每个方法均按度数而非弧度进行运算。具体要求是:在自己编写的类中，对Math类中的每一个方法加一层包装。(Create a class that provides all methods with the same name as java. lang. Math, but each method operates in degrees rather than radians. Specific requirements are: in their own class, each method in the Math class with a layer of packaging.)

JAVA版的聊天界面，方便局域网的人进行聊天(JAVA version of the chat interface, convenient LAN chat)

ID3 is data classification algorithm.it is used to generate decision tree from given data set.decision is used to make strategic decision from generated decision tree.

说明：  可以将气象数据grib2文件 转为json文件 便于使用与开发(The meteorological data grib2 file can be converted into JSON file for easy use and development)