（行为型模式二）中介者模式

package com.modle;
/**
 * 中介者模式
 * @author k560
 *
 */

/*需求:产品A要比产品B贵100块,当改A的价格，B的价格也要同步改动，反过来也一样*/
public class Mediator extends AbstractMediator{

	private AbstracProduct productA;

	private AbstracProduct productB;

	public Mediator(AbstracProduct productA, AbstracProduct productB) {
		super();
		this.productA = productA;
		this.productB = productB;
	}

	@Override
	public void aAffectB() {
		this.productB.setPrice(this.productA.getPrice()-100);

	}

	@Override
	public void bAffectA() {
	this.productA.setPrice(this.productB.getPrice()+100);
	}

	public static void main(String[] args) {
		AbstracProduct pa=new ProductA();
		AbstracProduct pb=new ProductB();
		AbstractMediator mediator=new Mediator(pa, pb);
		pa.setPrice(1000,mediator);
		System.out.println(pb.getPrice());
		pb.setPrice(600,mediator);
		System.out.println(pa.getPrice());
	}

}
/*抽象中介者*/
abstract class AbstractMediator {

	abstract  void aAffectB ();

	abstract void  bAffectA ();
}
/*抽象产品*/
abstract class AbstracProduct {

	protected double price;

	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public abstract void setPrice(double price,AbstractMediator mediator);
}

class ProductA extends AbstracProduct {

	@Override
	public void setPrice(double price, AbstractMediator mediator) {
           this.price=price;
           mediator.aAffectB();
	}
}

class ProductB extends AbstracProduct {
	@Override
	public void setPrice(double price, AbstractMediator mediator) {
         this.price=price;
         mediator.bAffectA();
	}
}