框架的最大好处就是重用。面向对象系统获得的最大的复用方式就是框架，一个大的应用系统往往可能由多层互相协作的框架组成。

　　框架能重用设计。它提供可重用的抽象算法及高层设计，并能将大系统分解成更小的构件，而且能描述构件间的内部接口。这些标准接口使在已有的构件基础上通过组装建立各种各样的系统成为可能。只要符合接口定义，新的构件就能插入框架中，构件设计者就能重用构架的设计。

-The greatest benefit is the reuse framework. Object-oriented systems were the biggest way is to reuse the framework, a large multi-application system may often be by the mutual cooperation framework. Framework can reuse design. It provides reusable algorithms and high-level abstract design, and can decompose large systems into smaller components, but also describes the internal interfaces between components. These standard interfaces to existing components in the basis of the establishment of a variety of systems through the assembly possible. As long as the line interface definition, the new component can be inserted framework, designers can reuse component architecture design.