delphi中类的封装演示，从简单到复杂，包括简单类的使用，到方法重载，属性的使用，构造和析构函数等等。介绍类的封装，源码中还有详细说明，请仔细阅读。-delphi package in the class presentation, from simple to complex, including the use of a simple class to method overloading, the use of property, construction and destructor and so on. Introduced the class package, the source code also details, please read them carefully.