简单定义一个由矩形左上角和右下角两点定义的矩形对象的类。该类包含一个复制矩形的构造函数和一个返回矩形对象的方法，该对象包含当前包含当前对象，并且该矩形作为参数传递该方法，还有一个用于显示该矩形的定义的点的方法。生成4个矩形对这个类进行测试，-simple definition of a rectangle from the upper left and lower right corner 2:00 definition of the rectangular object class. Such rectangle contains a copy of Constructors and a return rectangular object methods The targets included the current contains current object, and the rectangular pass as a parameter of the method, There is also a show for the rectangular point of the definition of the method. 4 rectangular formation of this type test