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 {

	@Override
	public void doSomething1() {
		System.out.println("Colleague1 依赖别人做事情...");
	}

	@Override
	public 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...