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Back Forward Refresh Home 2020年8月5日 星期三 RSS CLI Mine Sweeper. In Javascript.

  Abstract Class VS Interface[二]
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StrategyPattern,这个实例想做一个策略者:把已经声明过的方法操作,在运行时进行调换。猛地一听好像有些奇怪,类中的某个方法已经声明过了,怎么能在运行时,替换它的实际的处理过程呢,只留了个方法名而作别的事情。StrategyPattern就是实现了这样的操作。

IStrategyDraw IStrategyDraw Interface
using System;
namespace StrategyPattern
{
  /// <summary>
  /// Summary description for IStrategyDraw.
  /// </summary>
  public interface IStrategyDraw
  {
    //here just define a general draw function.
    string StragegyDraw();
  }
}

GeneralDraw GeneralDraw Class
using System;
namespace StrategyPattern
{
  /// <summary>
  /// Summary description for GeneralDraw.
  /// </summary>
  public class GeneralDraw
  {
    private IStrategyDraw _strategyDraw;

    public GeneralDraw()
    {
    }

    public IStrategyDraw StrategyDraw
    {
      get
      {
        return this._strategyDraw;
      }
      set
      {
        this._strategyDraw = value;
      }
    }

    public string StragegyDraw()
    {
      if (this._strategyDraw != null)
      {
        return this._strategyDraw.StragegyDraw();
      }
      else
      {
        return "";
      }
    }

    public string SelfDraw()
    {
      return "Self Draw";
    }

  }
}

ConsoleStrategy ConsoleStrategy Class
using System;
namespace StrategyPattern
{
  /// <summary>
  /// Summary description for ConsoleStrategy.
  /// </summary>
  public class ConsoleStrategy : IStrategyDraw
  {
    public ConsoleStrategy()
    {
    }

    #region IStrategyDraw Members

    public string StragegyDraw()
    {
      return "Console Draw";
    }

    #endregion
  }
}

WindowStategy WindowStategy Class
using System;
namespace StrategyPattern
{
  /// <summary>
  /// Summary description for WindowStategy.
  /// </summary>
  public class WindowStategy:IStrategyDraw
  {
    public WindowStategy()
    {
    }

    #region IStrategyDraw Members

    public string StragegyDraw()
    {
      return "Window Draw";
    }

    #endregion
  }
}

StrategyDraw Test Code
private void StrategyDraw()
{
  IStrategyDraw conStrategy = new ConsoleStrategy();
  IStrategyDraw winStrategy = new WindowStategy();
  GeneralDraw genDraw = new GeneralDraw();
  genDraw.StrategyDraw = conStrategy;

  Console.WriteLine("{0}",genDraw.StragegyDraw());
  Console.WriteLine("{0}",genDraw.SelfDraw());

  genDraw.StrategyDraw = winStrategy;
  Console.WriteLine("{0}",genDraw.StragegyDraw());
  Console.WriteLine("{0}",genDraw.SelfDraw());
}
   GeneralDraw在运行时,根据自己内部的的IStrategyDraw确定Draw方法的实际操作,而外表上看GeneralDraw只给外界公开说自己有一个Draw方法。
   在上面的两个设计模式中,DecoratorPattern中的ComponentDecorator这个AbstractClass体现了Class一级的抽象,AbstractClass提供给了子类共有的属性和方法。在DecoratorPattern和StrategyPattern中多出用到Interface,体现了Interface是方法一级的抽象。

所有代码在Windows 2003 Enterprise + VS 2003 Enterprise 下编译通过

File: Click to Download
  Posted @ 1/2/2006 3:42:45 PM | Hits (37934) | Comments (2

  Comment
 #re:Abstract Class VS Interface[二]  6/25/2010 9:31:49 AM  Alec.He
很巧我也被问过这个问题,这是我的答案

http://www.cnblogs.com/AlecHe/archive/2010/03/24/1693686.html
 #re:Abstract Class VS Interface[二]  1/10/2006 1:05:32 PM  淡如云烟
做个友情连接吧
淡如云烟 www.lupeng.org
你的连接偶早就做好了
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