void Print(Newspapper news)
{
Console.WriteLine("{0} 读报了！", this.Name);
Console.WriteLine("今日报纸头条：{0} ！", news.Title);
Console.WriteLine("日期：{0} ", news.Date.ToString("yyyy-MM-dd"));
Console.WriteLine("内容：{0} ", news.Content);
}
public void Begin()
{
ISubject newspapper = new Newspapper();
IObserver observer = new Person();
newspapper.RegisterObserver(observer);
newspapper.NotifyObserver(null);
}