《大话设计模式》java实现之中介者模式

public class Client {
public static void main(String[] args) {
UnitedNationsSecurityCouncil unsc = new UnitedNationsSecurityCouncil();

USA c1 = new USA(unsc);
Iraq c2 = new Iraq(unsc);

unsc.setColleague1(c1);
unsc.setColleague2(c2);

c1.declare("不准研制核武器，否则要发动战争！");
c2.declare("我们没有核武器，也不怕侵略");
}
}

public abstract class Country {
protected UnitedNations mediator;

public Country(UnitedNations mediator) {
super();
this.mediator = mediator;
}

}

public class Iraq extends Country {

public Iraq(UnitedNations mediator) {
super(mediator);
}

//声明
public void declare(String message) {
mediator.declare(message, this);
}

//获得消息
public void getMessage(String message) {
System.out.println("伊拉克获得对方消息：" + message);
}

}

public abstract class UnitedNations {
public abstract void declare(String message, Country colleague);
}

public class UnitedNationsSecurityCouncil extends UnitedNations {

private USA colleague1;
private Iraq colleague2;

public USA getColleague1() {
return colleague1;
}

public void setColleague1(USA colleague1) {
this.colleague1 = colleague1;
}

public Iraq getColleague2() {
return colleague2;
}

public void setColleague2(Iraq colleague2) {
this.colleague2 = colleague2;
}

@Override
public void declare(String message, Country colleague) {
if(colleague == colleague1) {
colleague2.getMessage(message);
} else {
colleague1.getMessage(message);
}

}

}

public class USA extends Country {

public USA(UnitedNations mediator) {
super(mediator);
}

//声明
public void declare(String message) {
mediator.declare(message, this);
}

//获得消息
public void getMessage(String message) {
System.out.println("美国获得对方消息：" + message);
}

}