定义一个时间类Time，有三个私有成员变量Hour、Minute、Second，定义构造函数、析构函数以及用于改变、获取、输出时间信息的公有函数，主函数中定义时间对象，并通过调用各种成员函数完成时间的设定、改变、获取、输出等功能。-Define a class of time Time, there are three private member variables Hour, Minute, Second, define a constructor, destructor, and is used to change, acquisition, output time information of public functions, the main function defined in the time of the object, and by calling a variety of member function to set the completion time of change, access, output and other functions.