本源码包内包括以下源码：接口的其它用法探索、接口和抽象类的实例、接口和多重继承的实例、Delphi实现接口的实例、模拟对象状态改变后自动恢复。-The source package includes the following source: other uses of the interface to explore an instance of the instance of interfaces and abstract classes, interfaces, and multiple