举动型模式-中介者模式（Mediator）

2013-08-06

行为型模式--中介者模式（Mediator）User类统一接口，User1和User2分别是不同的对象，二者之间有关联，如果不采

行为型模式--中介者模式（Mediator）

User类统一接口，User1和User2分别是不同的对象，二者之间有关联，如果不采用中介者模式，则需要二者相互持有引用，这样二者的耦合度很高，为了解耦，引入了Mediator类，提供统一接口，MyMediator为其实现类，里面持有User1和User2的实例，用来实现对User1和User2的控制。这样User1和User2两个对象相互独立，他们只需要保持好和Mediator之间的关系就行，剩下的全由MyMediator类来维护！基本实现：

[java]?view plaincopy

public?interface?Mediator?{??
????public?void?createMediator();??
????public?void?workAll();??
}??

[java]?view plaincopy

public?class?MyMediator?implements?Mediator?{??
??
????private?User?user1;??
????private?User?user2;??
??????
????public?User?getUser1()?{??
????????return?user1;??
????}??
??
????public?User?getUser2()?{??
????????return?user2;??
????}??
??
????@Override??
????public?void?createMediator()?{??
????????user1?=?new?User1(this);??
????????user2?=?new?User2(this);??
????}??
??
????@Override??
????public?void?workAll()?{??
????????user1.work();??
????????user2.work();??
????}??
}??

[java]?view plaincopy

public?abstract?class?User?{??
??????
????private?Mediator?mediator;??
??????
????public?Mediator?getMediator(){??
????????return?mediator;??
????}??
??????
????public?User(Mediator?mediator)?{??
????????this.mediator?=?mediator;??
????}??
??
????public?abstract?void?work();??
}??

[java]?view plaincopy

public?class?User1?extends?User?{??
??
????public?User1(Mediator?mediator){??
????????super(mediator);??
????}??
??????
????@Override??
????public?void?work()?{??
????????System.out.println("user1?exe!");??
????}??
}??

[java]?view plaincopy

public?class?User2?extends?User?{??
??
????public?User2(Mediator?mediator){??
????????super(mediator);??
????}??
??????
????@Override??
????public?void?work()?{??
????????System.out.println("user2?exe!");??
????}??
}??

测试类：

public?class?Test?{??
??
????public?static?void?main(String[]?args)?{??
????????Mediator?mediator?=?new?MyMediator();??
????????mediator.createMediator();??
????????mediator.workAll();??
????}??
}??

输出：

user1 exe!
user2 exe!

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举动型模式-中介者模式（Mediator）