杰哥1123

Define a family of algorithms,encapsulate each one,and make them interchangeable. 定义一组算法，将每个算法都封装起来，并且使它们之间可以互换。 策略模式（Strategy Pattern） 也叫 …

Define the skeleton of an algorithm in an operation,deferring some steps to subclasses.Template Method lets subclasses redefine certain ste…

观察者模式（Observer Pattern），又叫 发布-订阅（Publish/Subscribe）模式、模型-视图（Model/View）模式、源-监听器（Source/Listener）模式 或 从属者（Dependents）模式。 观察者模式 是对象的行为模式，定义了一…

Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation. 提供一种顺序访问聚集/容器对象元素的…

Advoid coupling the sender of a reuest to its receiver by giving more than one object a chance to handle the request. Chain the receiving o…

将来自客户端的请求传入一个对象，从而使你可用不同的请求对客户进行参数化。用于“行为请求者”与“行为实现者”解耦，可实现二者之间的松耦合，以便适应变化。分离变化与不变的因素。 1.降低对象之间的耦合度。 2.新的命令可以很容易地加入到系统中。 3.可以比较容易地设计一个组合命令。…

Allow an object to alter its behavior when its internal state changes. The object will appear to change its class. 允许对象在内部状态发生改变时改变它的行为，对象看…

Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.…

Represent an operation to be performed on the elements of an object structure. Visitor lets you define a new operation without changing the…