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微信支付退款接口java实现,微信官方文档提供，仅供参考(java weixin pay tuikuan interface,2016.06.28)

用java,jsp,servlet编写的一个购物车。(Using java, jsp, servlet written in a shopping cart.)

修改实验7中定义的Rectangle类，使之拥有两个构造方法。其中一个是默认的，它使两点的坐标都为（0，0） 另一个带有4个参数，求出左上角和右下角点坐标为（2.1，3.2）、（5.2，6.3）的矩形的周长及面积，再利用带参数的构造方法创建Rectangle对象，求出左上角和右下角点坐标为（1，2）、（6.8，10.5）的矩形的周长及面积.(Modify the definition of experiment 7 Rectangle class, so that it has two constructors. One is the default, it makes two points of the coordinate of (0,0) the other with four parameters, find the upper left and lower right corner coordinates (2.1,3.2), (5.2,6.3) and perimeter and area of ​ ​ a rectangle, and then use a parameterized constructor method to create a Rectangle object, find the upper left and lower right corner coordinates (1,2), (6.8,10.5) rectangle of perimeter and area.)

实现一个数据单元，包括学号和姓名两部分。 编写两个线程，一个线程往数据单元中写，另一个线程往出读。要求每写一次就往出读一次。

纯手编的超市会员管理系统，可支持会员注册，会员登录(验证码功能)，会员查询，会员删除等功能，界面友好，易于操作。(Pure hand-woven supermarket membership management system that supports membership registration, member login, membership inquiries, membership and delete functions, user-friendly, easy to operate. )

这是一款我封装的okhttp3，自动管理cookies,get,post,json请求和自动解析json功能，内附案例(This is a okhttp3 encapsulated by me, which automatically manages cookies, get, post, JSON requests and automatic parsing JSON functions.)

实现闪烁的标题栏(achieve flashing title bar)

一个简单的闹钟实例，适合初学者学习，界面简单。(A simple alarm clock examples for beginners to learn, simple interface.)

功能性需求：游戏状态的控制功能、游戏难度的调整、游戏界面的绘画、还价游戏控制功能(Functional Requirements: Control Function of Game State, Adjustment of Game Difficulty, Drawing of Game Interface, Control Function of Bargaining Game)

Java数据库编程经典教程:Classic Java database programming tutorial(Classic Java database programming tutorial: Classic Java database programming tutorial)