简介
中介者模式可以将一组对象之间的交互行为封装到一个中介者对象中，从而使对象之间的交互变得松散耦合，更易于维护和扩展。
抽象中介者
public interface Mediator {
public void send(String message, Colleague colleague);
}
具体中介者
public class ConcreteMediator implements Mediator {
private Colleague colleague1;
private Colleague colleague2;
public void setColleague1(Colleague colleague1) {
this.colleague1 = colleague1;
}
public void setColleague2(Colleague colleague2) {
this.colleague2 = colleague2;
}
@Override
public void send(String message, Colleague colleague) {
if (colleague == colleague1) {
colleague2.receive(message);
} else {
colleague1.receive(message);
}
}
}
抽象同事
public interface Colleague {
void setMediator(Mediator mediator);
void receive(String message);
void send(String message);
}
具体同事
public class ConcreteColleague1 implements Colleague {
private Mediator mediator;
@Override
public void setMediator(Mediator mediator) {
this.mediator = mediator;
}
@Override
public void receive(String message) {
System.out.println("接收到的消息:"+message);
}
@Override
public void send(String message) {
mediator.send(message,this);
}
}
public class ConcreteColleague2 implements Colleague {
private Mediator mediator;
@Override
public void setMediator(Mediator mediator) {
this.mediator = mediator;
}
@Override
public void receive(String message) {
System.out.println("接收到的消息:"+message);
}
@Override
public void send(String message) {
mediator.send(message,this);
}
}
测试
public class MediatorDemo {
public void mediator(){
ConcreteMediator concreteMediator = new ConcreteMediator();
Colleague concreteColleague1 = new ConcreteColleague1();
Colleague concreteColleague2 = new ConcreteColleague2();
concreteColleague1.setMediator(concreteMediator);
concreteColleague2.setMediator(concreteMediator);
concreteMediator.setColleague1(concreteColleague1);
concreteMediator.setColleague2(concreteColleague2);
concreteColleague1.send("哈喽2！");
concreteColleague2.send("哈喽1！");
}
}
