Some of the patterns covered are Singleton, Observer, Template Method, Iterator, and Proxy. 这些模式涵盖了单件模式,观察者模式,模板方法模式,迭代器模式和代理模式。
The proxy pattern provides an interface to the core application that hides the implementation details of accessing and manipulating data and application state. 代理模式提供了一个界面为核心的应用隐藏的实施细节访问和操纵数据和应用程序状态。