sort-xiancheng

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.)

Mybaties 的基础入门1， 开发工具 IDEA， TomCat，SQL(Introduction to Mybaties 1, Development tools IDEA, TomCat, SQL)

形式概念分析，概念格算法 包含两个算法，一个算法是对给定的概念上下文数据集并生成概念格，另一个算法则是绘制出概念格的图。(This demo shows two algorithms related to Formal Concept Analysis. Algorithm one calculates all Formal Concepts contained in a given Formal Context. The second algorithm draws a Formal Concept Lattice corresponding to the given Context. The Lattice is not drawn taking any aesthetic considerations into account. This will be part of future enhancements. The program was written using Java (my first Java experience, a quite complex "Hello World").)

将基础知识，高级运用，框架知识综合到一起，源码demo(Fundamentals and advanced the framework of the use of knowledge are integrated together, source demo)

利用java编写的路径平滑算法，采用2次+3次贝塞尔曲线拟合路径，并且可以按照一定距离间隔生成采样点(Written using java path smoothing algorithm, using the 2+3 Bezier curve fitting path, and the sampling points can be generated in accordance with a certain distance interval)

简单的记帐工具,没有调用数据库,非常适合学生进行安卓的学习(Accounting tools simple, do not call the database, very suitable for students learning for Android )

一个java的万年历程序，在编程信息栏显示(A java calendar program, the programming information bar)

多线程管理系统，可用于售票服务和排队服务的优先级等等，java实现(multithreading management system can be used for ticketing services and the priority queue levels, and so on, to achieve java)

教师业务档案管理系统申网易联是一家专业从事：域名注册、空间租用、服务器租用托管 电信IDC业务等网站建设一体化的正规电信级网络公司,我们以电信级的设施、专业的品质、实在的价格、高速的访问速度为众多的网站建设者提供更快、更稳、更安全的网站空间(Teachers file management systems Shen Netease Alliance engaged in a professional : domain name registration, space rental, rental server hosting IDC telecommunications business sites such as the building of integrated formal telecommunications network company, our carrier-class facilities and professional quality, is the price the high speed access to the many websites builders provide faster, more stable, more secure web space)

java升级第五版，学习java的工具，值得一看(Java bible fifth edition, learn Java tool, is worth a look.)