ConcreteColleague2.Notify C# (CSharp) Method

    public override void Notify(string message)
    {
        Console.WriteLine($"同事2 得到信息：{message}");
    }
}

 public override void Send(string message, Colleague colleague)
 {
     if (colleague == _colleague1)
     {
         _colleague2.Notify(message);
     }
     else
     {
         _colleague1.Notify(message);
     }
 }