参考资料

《java与模式》

上面那本书上的例子举的是园丁和果园的例子，学习设计模式最好在生活中自己找个例子

实践一下，下面是我自己的一个例子，是讲快餐店的例子，快餐店提供很多食物，比如

面条，米饭，面包。首先定义了一个Food接口，然后这些食物都从它来继承，定义了一个大厨

他包办所有食物的制作工作，这就是我所理解的简单工厂模式的概念，下面是源代码：

using System;

namespace SimpleFactoryPattern
{
 /// <summary>
 /// 简单工厂模式示例
 /// </summary>
 class SimpleFactoryPattern
 {
  //定义Food接口
   public interface Food
   {
         //烹饪
         void Cook();
         //卖出
         void Sell();

   }

  //Noodle

  public class Noodle:Food
  {
           public  Noodle()
           {
            Console.WriteLine("\nThe Noodle is made..");
           }
           private int price;
   
           //面条Noodle的Cook方法接口实现
           public void Cook()
           {
            Console.WriteLine("\nNoodle is cooking...");
           }

           //面条Noodle的Sell方法接口实现
           public void Sell()
           {
            Console.WriteLine("\nNoodle has been sold...");
           }
           public int Price
           {
            get{return this.price;}
            set{price=value;}
           }
  }

  //Rice
  public class Rice:Food
  {
           public Rice()
           {
            Console.WriteLine("\nThe Rice is made ..");
           }
           private int price;
           public void Cook()
           {
            Console.WriteLine("\nRice is cooking...");
           }
           public void Sell()
           {
            Console.WriteLine("\nRice has been sold...");
           }
           public int Price
           {
            get{return this.price;}
            set{price=value;}
           }
  }

    //Bread
  public class Bread:Food
  {
           public Bread()
           {
            Console.WriteLine("\nThe Bread is made....");
           }
           private int price;
           public void Cook()
           {
            Console.WriteLine("\nBread is cooking...");
           }
           public void Sell()
           {
            Console.WriteLine("\nBread has been sold...");
           }
           public int Price
           {
            get{return this.price;}
            set{price=value;}
           }
  }
 

 //定义大厨，他包办这个快餐店里的所有Food,包括面条，面包和米饭
  class Chef
  {
           public static Food MakeFood(string foodName)
           {
                    try
                    {
                             switch(foodName)
                             {
                                  case "noodle": return new Noodle();
                                  case "rice":return new Rice();
                                  case "bread":return new Bread();
                                  default:throw new BadFoodException("Bad food request!");
                             }
                    }
                    catch(BadFoodException e)
                    {
                             throw e;
                    }
   }
   
  }

  //异常类，该餐馆没有的食品
  class BadFoodException: System.Exception
  {
            public BadFoodException(string strMsg)
           {
                Console.WriteLine(strMsg);
           }
  }

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main(string[] args)
  {
           Food food=Chef.MakeFood("bread");
           food.Cook();
           food.Sell();
           Console.ReadLine();
  }
 }
}