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说明：  自己学习ssm开发的小系统,这是业务层，包含必要的Java代码(learn ssm and develop a system by myself)

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.)

vCard parser for vCard 4.0.

Java中String.format的用法(String.format usage in Java)

时间日期服务器(Date and Time Server)

基本算法： 采用博弈比较常用的策略。 计算机下子前，分别对玩家和电脑棋型进行评估，然后根据棋型对每一位置打分（玩家和电脑在同一点的分数不同），比如活三100分，冲四1000分等，然后根据每个落子点分数进行选择。采用极大极小值策略，进行多步计算。(Basic algorithm: The game strategy is commonly used. Before computer playing, players and computer chess models are evaluated separately, and then each position is scored according to the chess pattern (players and computers have different scores at the same point), such as live three hundred points, go four thousand points, and then choose according to the score of each falling point. Multi-step calculation is carried out by using the minimax strategy.)

使用户可以添加node，Edges，并且应用一些sorting算法(allows user to add, delete, and move node and edges in graph data structure and play with sorting algorithms)

解包贴图文件 Unpackaged Mapping FileUnpackaged Mapping File(Unpackaged Mapping Mapping document)

实现企业的管理，注册，专利，等等。。。功能。(xia jun javascript)

传智播客毕向东老师Java_SE基础课程笔记(Chuan Chi podcast Bi Xiangdong teacher Java_SE basic course notes)