摘要：
一、 1.因为是操作经常变化，所以封装操作为command对象。You can do that by introducing “command objects” into your design. A command object encapsulates a request to do somet 阅读全文
摘要：
一、 1.The Singleton Pattern ensures a class has only one instance, and provides a global point of access to it. 2. 3. 二、例子一：线程不安全 1 package headfirst.d 阅读全文
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一、 1.The Facade Pattern provides a unifi ed interface to a set of interfaces in a subsytem. Facade defi nes a higher-level interface that makes the su 阅读全文
摘要：
一、 1."工厂模式"不是种真正的设计模式，而是一种编程术语 2.The Factory Method Pattern defi nes an interface for creating an object, but lets subclasses decide which class to in 阅读全文
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一、 1.The Decorator Pattern attaches additional responsibilities to an object dynamically.Decorators provide a fl exible alternative to subclassing for 阅读全文