直接来个例子
首先，定义个基类国家的概念，包含声明方法与接收消息方法；并且保存有联合国的引用
public abstract class Country
{
protected UnitNations unitNations;
public Country(UnitNations unitNations)
{
super();
this.unitNations = unitNations;
}
public abstract void declare(String msg);
public abstract void getmsg(String msg);
}
好事者美国，可以声明消息与接收消息
public class USA extends Country
{
public USA(UnitNations unitNations)
{
super(unitNations);
}
@Override
public void declare(String msg)
{
this.unitNations.sendMsg(msg, this);
}
@Override
public void getmsg(String msg)
{
System.out.println("USA获得信息" + msg);
}
}
尹拉克就比较惨了，也可以声明消息与接收消息
public class Iraq extends Country
{
public Iraq(UnitNations unitNations)
{
super(unitNations);
}
@Override
public void declare(String msg)
{
this.unitNations.sendMsg(msg, this);
}
@Override
public void getmsg(String msg)
{
System.out.println("Iraq获得消息" + msg);
}
}
联合国组织，可能会有多个具体组织的
public abstract class UnitNations
{
public abstract void sendMsg(String msg, Country cty);
}
联合国了，主要作用就是判断消息应该由那个国家接收，发到相应的国家，这里做的简单，实际应该把消息目的国家放到消息体中的，但是实现麻烦了
public class UnitNationsSecurityCouncil extends UnitNations
{
private Country Usa;
private Country Iraq;
// setters && getters
@Override
public void sendMsg(String msg, Country cty)
{
if (cty == this.Usa)
{
this.Iraq.getmsg(msg);
}
else
{
this.Usa.getmsg(msg);;
}
}
}
客户端一向简单至上
public class MediatorMain
{
public static void main(String[] args)
{
UnitNationsSecurityCouncil unsc = new UnitNationsSecurityCouncil();
Country c1 = new USA(unsc);
Country c2 = new Iraq(unsc);
unsc.setUsa(c1);
unsc.setIraq(c2);
c1.declare("开打");
c2.declare("别打我");
}
}