用一个中介对象来封装一系列的对象交互。中介者使各对象不需要显式地相互引用,从而使其耦合松散,而且可以独立地改变它们之间的交互。
package com.lyz.design.mediator;
/**
* Mediator
* @author binghe
*
*/
public abstract class Mediator {
public abstract void notice(String content);
}
package com.lyz.design.mediator;
/**
* ConcreteMediator
* @author binghe
*
*/
public class ConcreteMediator extends Mediator {
private ColleagueA ca;
private ColleagueB cb;
public ConcreteMediator() {
ca = new ColleagueA();
cb = new ColleagueB();
}
public void notice(String content) {
if (content.equals("boss")) {
//老板来了, 通知员工A
ca.action();
}
if (content.equals("client")) {
//客户来了, 通知前台B
cb.action();
}
}
}
package com.lyz.design.mediator;
/**
* Colleagueclass
* @author binghe
*
*/
public class ColleagueA extends Colleague {
public void action() {
System.out.println("普通员工努力工作");
}
}
ColleagueB
package com.lyz.design.mediator;
/**
* Colleagueclass
* @author binghe
*
*/
public class ColleagueB extends Colleague {
public void action() {
System.out.println("前台注意了!");
}
}
package com.lyz.design.mediator;
/**
* Test
* @author binghe
*
*/
public class Test {
public static void main(String[] args) {
Mediator med = new ConcreteMediator();
//老板来了
med.notice("boss");
//客户来了
med.notice("client");
}
}
普通员工努力工作
前台注意了!