//聯(lián)合國機構(gòu)
abstract class UnitedNations
{
    //聲明
    public abstract void Declare(string message, Country colleague);
}

//國家
abstract class Country
{
    protected UnitedNations mediator;
    public Country(UnitedNations mediator)
    {
        this.mediator = mediator;
    }
}

//美國
class USA : Country
{
    public USA(UnitedNations mediator) : base(mediator)
    {
    }
    //聲明
    public void Declare(string message)
    {
        mediator.Declare(message, this);
    }
    //獲取消息
    public void GetMessage(string message)
    {
        Console.WriteLine("美國獲得對方消息：" + message);
    }
}

//伊拉克
class Iraq : Country
{
    public Iraq(UnitedNations mediator) : base(mediator)
    {
    }
    //聲明
    public void Declare(string message)
    {
        mediator.Declare(message, this);
    }
    //獲取消息
    public void GetMessage(string message)
    {
        Console.WriteLine("伊拉克獲得對方消息：" + message);
    }
}

//聯(lián)合國安全理事會
class UnitedNationsSecurity : UnitedNations
{
    private USA colleague1;
    private Iraq colleague2;
    //美國
    public USA Colleague1 { set { colleague1 = value; } }
    //伊拉克
    public Iraq Colleague2 { set { colleague2 = value; } }
    public override void Declare(string message, Country colleague)
    {
        if (colleague == colleague1)
        {
            colleague2.GetMessage(message);
        }
        else
        {
            colleague1.GetMessage(message);
        }
    }
}

class Program
{
    //客戶端代碼
    static void Main(string[] args)
    {
        UnitedNationsSecurity UNSC = new UnitedNationsSecurity();
        USA c1 = new USA(UNSC);
        Iraq c2 = new Iraq(UNSC);
        UNSC.Colleague1 = c1;
        UNSC.Colleague2 = c2;
        c1.Declare("不準研發(fā)核武器，否則開戰(zhàn)");
        c2.Declare("沒研發(fā)，開戰(zhàn)就開戰(zhàn)");
        Console.Read();
    }
}