面向对象程序的基本元素是对象,面向对象程序的主要结构特点是:第一,程序一般由类的定义和类的使用两部分组成,在主程序中定义各对象并规定它们之间传递消息的规律.第二,程序中的一切操作都是通过向对象发送消息来实现的,对象接收到消息后,启动有关方法完成相应的操作-Object-oriented programming is the basic element of object, main structure characteristics of object-oriented programming is: first, the process by the use of the class definition and class of two parts, each object defined in the main program and the law of passing messages between them. Second, the application of all operations are done by sending messages to objects, object to receive news, start the relevant method to complete the corresponding operation