static void Main(string[] args)
{
News ChinaNews = new News();
News EuropeNews = new News();
Person person1 = new Person("heqichang");
Person person2 = new Person("Jim");
//我自己订阅了中国新闻和欧洲新闻
person1.Subscribe(ChinaNews);
person1.Subscribe(EuropeNews);
//Jim订阅了欧洲新闻
person2.Subscribe(EuropeNews);
EuropeNews.AddArticle(new Article()
{
Title = "New title",
Date = DateTime.Now.Date,
Author = "heqichang",
Content = "New content"
});
Console.ReadKey();
}