Adapter模式
同样的方法我们来解决中国人和英国人对话的问题:
概述
Adapter模式又叫适配器(变压器)模式:把一个类的接口变换成客户端所期待的另一种接口,从而使原本因接口原因不匹配而无法一起工作的两个类能够一起工作。适配类可以根据参数返还一个合适的实例给客户端。
设计
那么是如何“适配”的呢?比如,东西A想使用东西B,但是A无法使用B,怎么办?A就让东西C帮忙,A通过C就可以用B了。其实A、B就好像是两节水管,C就好像是连接水管的接头。
实现
UML图:
标准示例:
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// Adapter
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// Intent: "Convert the interface of a class into another interface
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// clients expect. Adapter lets classes work together that couldn't
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// otherwise because of incompatible interfaces".
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// For further information, read "Design Patterns", p139, Gamma et al.,
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// Addison-Wesley, ISBN:0-201-63361-2
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/* Notes:
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* Adapters are often used when client code is written to expect classes
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* from one framework, and it meant to work with classes from a totally
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* different framework. Assume you cannot change the code of either framework.
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* the solution is for you to write an adapter, which appears like a
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* native class to each framework.
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*
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* There are two different types of adapters - class adapter and object
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* adapter. Class adapters are based on multiple inheritance - specifically
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* the interface of the target class and the implementation of the adaptee.
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* Unfortunately C# supports multiple inheritance for interfaces but not
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* for classes. Object adapters derive from the target (single inheritance)
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* and maintain a private instance of the adoptee.
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*
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* The sample code here shows an object adapter. We have a class called
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* FrameworkYAdaptee which we wish to use, yet the (bulk of) the client code
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* (in GenericClientCode) is written to expect a class called FrameworkXTarget.
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* To solve the probelm we create an Adapter class, which it a FrameworkXTarget
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* to the client, and calls FrameworkYAdaptee.
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*
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*/
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namespace Adapter_DesignPattern
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{
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using System;
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class FrameworkXTarget
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{
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virtual public void SomeRequest(int x)
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{
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// normal implementation of SomeRequest goes here
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}
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}
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class FrameworkYAdaptee
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{
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public void QuiteADifferentRequest(string str)
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{
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Console.WriteLine("QuiteADifferentRequest = {0}", str);
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}
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}
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class OurAdapter : FrameworkXTarget
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{
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private FrameworkYAdaptee adaptee = new FrameworkYAdaptee();
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override public void SomeRequest(int a)
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{
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string b;
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b = a.ToString();
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adaptee.QuiteADifferentRequest(b);
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}
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}
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/// <summary>
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/// Summary description for Client.
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/// </summary>
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public class Client
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{
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void GenericClientCode(FrameworkXTarget x)
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{
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// We assume this function contains client-side code that only
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// knows about FrameworkXTarget.
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x.SomeRequest(4);
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// other calls to FrameworkX go here
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// ![](https://www.cnblogs.com/Images/dot.gif)
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}
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public static int Main(string[] args)
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{
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Client c = new Client();
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FrameworkXTarget x = new OurAdapter();
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c.GenericClientCode(x);
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return 0;
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}
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}
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}
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示例代码为:
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using System;
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namespace Example
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{
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/// <summary>
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/// 示例
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/// </summary>
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class Example
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{
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/// <summary>
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/// 应用程序的主入口点。
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/// </summary>
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[STAThread]
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static void Main(string[] args)
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{
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Hosepipe pipe = new BigHosepipe() ;
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pipe.Influx() ;
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pipe.Effuse() ;
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}
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/// <summary>
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/// 水
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/// </summary>
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public class Water
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{
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public Water() {}
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}
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/// <summary>
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/// 大水管
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/// </summary>
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/// <remarks>
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/// 程序员A编写
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/// 测试员C测试
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/// </remarks>
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public class BigPipe
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{
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public Water In()
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{
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Console.WriteLine( "流入水" ) ;
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return new Water() ;
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}
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public void Out()
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{
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Console.WriteLine( "水流出" ) ;
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}
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}
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/// <summary>
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/// 水管接口
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/// </summary>
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interface Hosepipe
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{
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/// <summary>
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/// 进水
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/// </summary>
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/// <returns>水</returns>
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Water Influx() ;
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/// <summary>
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/// 出水
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/// </summary>
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void Effuse() ;
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}
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/// <summary>
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/// 小水管
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/// </summary>
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public class SmallHosepipe : Hosepipe
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{
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#region Hosepipe 成员
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public Water Influx()
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{
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// TODO: 添加 SmallHosepipe.Influx 实现
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return null;
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}
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public void Effuse()
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{
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// TODO: 添加 SmallHosepipe.Effuse 实现
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}
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#endregion
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}
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/// <summary>
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/// 中水管
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/// </summary>
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public class MiddleHosepipe : Hosepipe
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{
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#region Hosepipe 成员
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public Water Influx()
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{
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// TODO: 添加 MiddleHosepipe.Influx 实现
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return null;
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}
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public void Effuse()
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{
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// TODO: 添加 MiddleHosepipe.Effuse 实现
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}
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#endregion
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}
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/// <summary>
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/// 大水管
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/// </summary>
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/// <remarks>
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/// 当准备写大水管的进出水方法时,发现程序A已经写过同样功能的代码
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/// 但是A命名时并没有征求你的意见以及你也没有要求
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/// 所以只要采用Adapter模式,使用A已编好的功能
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/// </remarks>
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public class BigHosepipe : Hosepipe
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{
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private BigPipe bigPipe = new BigPipe() ;
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#region Hosepipe 成员
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public Water Influx()
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{
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return bigPipe.In() ;
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}
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public void Effuse()
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{
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bigPipe.Out() ;
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}
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#endregion
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}
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}
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}
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同样的方法我们来解决中国人和英国人对话的问题:
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namespace DesignPattern.Template
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{
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/// <summary>
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/// 人们的话语
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/// </summary>
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public class Words
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{
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public Words(){}
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}
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/// <summary>
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/// 英国人
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/// </summary>
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public class English
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{
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public English()
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{
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}
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public Words Speak()
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{
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return words;
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}
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public Words Understand(Words words )
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{
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return newWords;
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}
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}
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/// <summary>
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/// 中国人
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/// </summary>
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public class Chinese
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{
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public Chinese()
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{
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}
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public string Speak()
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{
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get
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{
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return words;
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}
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}
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public Words Understand(Words words )
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{
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return newWords;
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}
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}
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public class LanguageAdapter:English
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{
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private English english=new English ();
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/// <summary>
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/// 这个函数实现了英文转化中文
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/// </summary>
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/// <param name="words"></param>
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/// <returns></returns>
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public Words Translate(Word words)
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{
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}
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/// <summary>
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/// 重载了英国人说话的方法
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/// </summary>
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/// <returns></returns>
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public Words Speak()
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{
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Words englishWords= english.Speak ();
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return this.Translate(englishWords);
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}
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public Words Understand( Words words)
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{
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Words englishWords=english.Understand (words);
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return this.Translate (englishWords);
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}
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}
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}
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