说明：  本书讲解如何设计应用框架。 应用框架为基于其上构建的应用提供通用服务，使你的代码和设计获得可扩展性、模块化和可重用性的好处。本书阐述了什么是框架、以及许多用于创建框架的面向对象技术。
(This book explain how to design application framework. Application framework built on the basis of their application to provide generic services to enable you to obtain the code and design scalable, modular and reusability benefits. What is expounded in this book are the framework, as well as much used to create a framework for object-oriented technology.)