最近在看博客園里的推薦的《你必須知道的.NET》，對里面有一段關于銀行的客戶和職員的安排的程序有點興趣。這里我把他改了下，促進理解：

?

Code
??1using?System;
??2using?System.Collections.Generic;
??3using?System.Text;
??4
??5namespace?ConsoleApplication1
??6{
??7????class?Program
??8????{
??9????????static?void?Main(string[]?args)
?10????????{
?11????????????bankManage?bank?=?new?bankManage();
?12????????????bank.operate(new?savingRequestion());
?13????????????bank.operate(new?outingRequest());
?14????????????bank.operate(new?turningRequest());
?15????????????Console.ReadKey();
?16????????}
?17????}
?18????/**////?<summary>
?19????///?銀行業務接口
?20????///?</summary>
?21????public?interface?operation
?22????{
?23????????void?operate();
?24????}
?25????/**////?<summary>
?26????///?存錢業務
?27????///?</summary>
?28????public?class?savingBox?:?operation
?29????{
?30????????operation?Members#region?operation?Members
?31
?32????????public?void?operate()
?33????????{
?34????????????Console.Write("You?are?saving!\n");
?35????????}
?36
?37????????#endregion
?38????}
?39????/**////?<summary>
?40????///?取錢業務
?41????///?</summary>
?42????public?class?outingBox?:?operation
?43????{
?44????????operation?Members#region?operation?Members
?45
?46????????public?void?operate()
?47????????{
?48????????????Console.Write("You?are?outing!\n");
?49????????}
?50
?51????????#endregion
?52????}
?53????/**////?<summary>
?54????///?需求
?55????///?</summary>
?56????public?interface?requestion
?57????{
?58????????operation?request();
?59????}
?60????/**////?<summary>
?61????///?存錢需求
?62????///?</summary>
?63????public?class?savingRequestion?:?requestion
?64????{
?65????????requestion?Members#region?requestion?Members
?66
?67????????public?operation?request()
?68????????{
?69????????????return?new?savingBox();
?70????????}
?71
?72????????#endregion
?73????}
?74????/**////?<summary>
?75????///?取錢需求
?76????///?</summary>
?77????public?class?outingRequest?:?requestion
?78????{
?79????????requestion?Members#region?requestion?Members
?80
?81????????public?operation?request()
?82????????{
?83????????????return?new?outingBox();
?84????????}
?85
?86????????#endregion
?87????}
?88????/**////?<summary>
?89????///?銀行管理
?90????///?</summary>
?91????public?class?bankManage
?92????{
?93
?94????????public?void?operate(requestion?man)
?95????????{
?96????????????operation?oper?=?man.request();
?97????????????oper.operate();
?98????????}
?99????}
100????/**////?<summary>
101????///?轉賬業務
102????///?</summary>
103????public?class?turningBox?:?operation
104????{
105????????operation?Members#region?operation?Members
106
107????????public?void?operate()
108????????{
109????????????Console.Write("you?are?turning!\n");
110????????}
111
112????????#endregion
113????}
114????/**////?<summary>
115????///?轉賬需求
116????///?</summary>
117????public?class?turningRequest?:?requestion
118????{
119????????requestion?Members#region?requestion?Members
120
121????????public?operation?request()
122????????{
123????????????return?new?turningBox();
124????????}
125
126????????#endregion
127????}
128}

類圖：

如果我們屏蔽設計模式在本銀行系統中的應用，單從供求關系來理解這段程序最好不過了，對于一個銀行系統來說，主要包含職員和客戶，職員按分工的不同分為諸如存款職員、轉賬職員、取款職員等，客戶又分為存款客戶、取款客戶、轉賬客戶等，從這方面來講，似乎更難理解，換種方式，將銀行系統分為需求和業務，客戶對應需求，每個銀行的客戶都會對銀行產生一種需求；銀行提供的服務既是業務，職員對應業務；于是這樣產生一個自然界的恒等式，即需求=業務，如果客戶沒有需求，那么銀行就不會提供該種業務；所以在程序中不論用戶的存款、取款、轉賬需求，最終都將return一個銀行業務，單對于每一個業務的處理過程（operate），由于是銀行內部的事情，所以應封裝在業務類中，中間采用一個銀行管理對象來（bankManage）連接二者之間的交互過程。

轉載于:https://www.cnblogs.com/cdutedu/archive/2008/08/27/HelloWorld.html

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