设计模式之中介者模式

描述：中介者模式在我们日常生活中出现的频率比较多，例如现在市场上出现的房产中介，买家或者卖家都可以自己独立去找房子或者卖房子，还可以通过中介的方式去买房或者卖房，通过中介的方式买家和卖家必须把自己信息注册到中介Mediator中，当买家需要通过中介的方式买房时，买家先找到自己注册的中介，然后通过中介找到合适的卖家。

UML类图如下：

测试代码如下：

1、中介抽象类

package com.java.mediator;public abstract class Mediator {protected ConcreteColleague1 colleague1;protected ConcreteColleague2 colleague2;public ConcreteColleague1 getColleague1() {return colleague1;}public void setColleague1(ConcreteColleague1 colleague1) {this.colleague1 = colleague1;}public ConcreteColleague2 getColleague2() {return colleague2;}public void setColleague2(ConcreteColleague2 colleague2) {this.colleague2 = colleague2;}public abstract void doSomething1();public abstract void doSomething2();}

2、具体中介

package com.java.mediator;public class ConcreteMediator extends Mediator {@Overridepublic void doSomething1() {System.out.println("Colleague1 依赖别人做事情...");}@Overridepublic void doSomething2() {System.out.println("Colleague2依赖别人 做事情...");}}

3、抽象Colleague

package com.java.mediator;public abstract class Colleague {protected Mediator mediator;public Colleague(Mediator mediator) {this.mediator = mediator;}}

4、具体Colleague

package com.java.mediator;public abstract class Mediator {protected ConcreteColleague1 colleague1;protected ConcreteColleague2 colleague2;public ConcreteColleague1 getColleague1() {return colleague1;}public void setColleague1(ConcreteColleague1 colleague1) {this.colleague1 = colleague1;}public ConcreteColleague2 getColleague2() {return colleague2;}public void setColleague2(ConcreteColleague2 colleague2) {this.colleague2 = colleague2;}public abstract void doSomething1();public abstract void doSomething2();}

package com.java.mediator;public class ConcreteColleague2 extends Colleague {public ConcreteColleague2(Mediator mediator) {super(mediator);}public void selfMethod(){System.out.println("ConcreteColleague2独立做事情...");}public void depMethod(){super.mediator.doSomething2();}}

5、测试类

package com.java.mediator;public class MediatorTest {public static void main(String[] args) {Mediator mediator = new ConcreteMediator();ConcreteColleague1 c1 = new ConcreteColleague1(mediator);ConcreteColleague2 c2 = new ConcreteColleague2(mediator);c1.selfMethod();c1.depMethod();c2.selfMethod();c2.depMethod();}}

6、测试结果

ConcreteColleague1独立做事情...Colleague1 依赖别人做事情...ConcreteColleague2独立做事情...Colleague2依赖别人 做事情...