用一个对象来封装一系列的对象交互。中介者使各对象不需要显示的互相引用,从而使其耦合松散,而且可以独立地改变它们之间的交互。
一组对象以定义良好但是复杂的方式进行通信的场合。
code:
代码结构图代码
代码部分1
package designmodel.chapter25;
/**
* @Author: cxh
* @CreateTime: 18/2/20 12:38
* @ProjectName: JavaBaseTest
*/
public abstract class Colleague {
Mediate mediate;
public void setMediate(Mediate mediate) {
this.mediate = mediate;
}
public abstract void send(String sendInfo);
public abstract void receive(String getInfo);
}
代码部分2
package designmodel.chapter25;
/**
* @Author: cxh
* @CreateTime: 18/2/20 13:55
* @ProjectName: JavaBaseTest
*/
public class ConcreteColleague1 extends Colleague{
@Override
public void send(String sendInfo) {
System.out.println("提申请::朝鲜->联合国安理会:"+sendInfo);
super.mediate.declare(sendInfo,this);
}
@Override
public void receive(String getInfo) {
System.out.println("收通知::联合国安理会->朝鲜:"+getInfo);
}
}
代码部分3
package designmodel.chapter25;
/**
* @Author: cxh
* @CreateTime: 18/2/20 14:19
* @ProjectName: JavaBaseTest
*/
public class ConcreteColleague2 extends Colleague {
@Override
public void send(String sendInfo) {
System.out.println("提申请::美国->联合国安理会:"+sendInfo);
super.mediate.declare(sendInfo,this);
}
@Override
public void receive(String getInfo) {
System.out.println("收通知::联合国安理会->美国:"+getInfo);
}
}
代码部分4
package designmodel.chapter25;
/**
* @Author: cxh
* @CreateTime: 18/2/20 14:22
* @ProjectName: JavaBaseTest
*/
public class ConcreteMediate extends Mediate {
private ConcreteColleague1 concreteColleague1;
private ConcreteColleague2 concreteColleague2;
public void setConcreteColleague1(ConcreteColleague1 concreteColleague1) {
this.concreteColleague1 = concreteColleague1;
}
public void setConcreteColleague2(ConcreteColleague2 concreteColleague2) {
this.concreteColleague2 = concreteColleague2;
}
@Override
public void declare(String messgae, Colleague colleague) {
if(colleague instanceof ConcreteColleague1 && concreteColleague1!=null){
concreteColleague1.receive("朝鲜须接受美国提出的任何条件!");
}else if(colleague instanceof ConcreteColleague2 && concreteColleague2!=null){
concreteColleague2.receive("美国可以向朝鲜提出任何条件!");
}else{
System.out.println("error");
}
}
}
代码部分5
package designmodel.chapter25;
/**
* @Author: cxh
* @CreateTime: 18/2/20 14:40
* @ProjectName: JavaBaseTest
*/
public class Main {
public static void main(String[] args) {
ConcreteColleague1 Korea=new ConcreteColleague1();//朝鲜
ConcreteColleague2 USA=new ConcreteColleague2();//美国
ConcreteMediate mediate=new ConcreteMediate();//联合国安理会
mediate.setConcreteColleague1(Korea);
mediate.setConcreteColleague2(USA);
Korea.setMediate(mediate);
USA.setMediate(mediate);
Korea.send("请求联合国安理会支持朝鲜半岛的统一,杜绝美国的干涉");
System.out.println("--------------------------------我是分隔线----------------------------");
USA.send("请求联合国安理会驳回朝鲜期望统一的无理要求");
}
}
代码部分6
package designmodel.chapter25;
/**
* @Author: cxh
* @CreateTime: 18/2/20 12:38
* @ProjectName: JavaBaseTest
*/
public abstract class Mediate{
public abstract void declare(String messgae,Colleague colleague);
}