标签：style blog class code java c
(IT的事就是过场多,过场多了就容易忘,所以我们不妨看一个记一个,这也是一个办法,顺便还能跟同行们交流一下)
要和老婆一起回老家了, 成都离我们安徽太远, 两个人飞一下过去就要花掉近三千块, 于是我们决定找找有没有更便宜的机票,
"你帮我找找吧, 如果找到的话,跟我说一下",我说道.
"行!"老婆记住了这事.
很快我得到通知, 南航有更便宜的, 580块.
这是一个简单的observer模式.
什么是observer? 其定义如下:
The Observer Patern defines a one-to-many dependency betwen objects so that when one object changes state, all its dependents are notified and updated automatically.
大概结构来描述就如下:
其中Neo(就是我以前在IT混日子的马甲拉)是继承于TicketBuyer这个抽象类的, 为什么这里要加一个抽象类,因为老婆表兄妹多, 都有可能找她订票, 所以要把这些表兄妹的行为抽象到一个公共的抽象类上.
using System; using System.Collections.Generic; public abstract class TicketBuyer { public int TicketPrice; public string Airline; } public class Neo: TicketBuyer { private int _ticketPrice; private string _airline; public int TicketPrice { get {return _ticketPrice;} set {_ticketPrice = value;} } public string Airline { get{return _airline;} set{_airline = value;} } } public class FeiFei { private string _airline; private int _ticketPrice; IList<TicketBuyer> _ticketBuyers; public FeiFei() { _ticketBuyers = new List<TicketBuyer>(); } public void AddTicketBuyer(TicketBuyer t) { _ticketBuyers.Add(t); } public void DeleteTicketBuyer(TicketBuyer t) { _ticketBuyers.Remove(t); } public void NotifyTicketInformation() { SearchTicket(); foreach(TicketBuyer t in _ticketBuyers) { t.Airline = _airline; t.TicketPrice = _ticketPrice; } } private void SearchTicket() { _airline = "China Southern"; _ticketPrice = 580; } }
运行代码看一下结果：
public class Test { public static void Main() { TicketBuyer n = new Neo(); FeiFei f = new FeiFei(); f.AddTicketBuyer(n); f.NotifyTicketInformation(); Console.WriteLine("Airline:" + n.Airline + ", price:" + n.TicketPrice); Console.Read(); } }
好了，以上是个人对Observer模式的理解，如有不正确的地方，希望同行能帮我纠正。
谢谢大家！
小故事学设计模式之Observer : (三) 老婆帮忙订机票,布布扣,bubuko.com
小故事学设计模式之Observer : (三) 老婆帮忙订机票
标签：style blog class code java c
原文地址：http://www.cnblogs.com/yongyong/p/3721137.html
