故事：

　　有个定制鞋子的工厂（还是那个工厂）（因为使用了设计模式应对了各种变化）效益比较好，决定把生产部门分成两个部门（休闲鞋部门/运动鞋部门）。每个部门生产相应的鞋子类型。

 

建模：

　　工厂运动鞋生产部门/工厂休闲鞋生产部门。

　　工厂前台接待处。

　　鞋子。

　　你还是这个工厂的客户。

 

类图：

 

实现：

HelpDesk

namespace FactoryMethod{    public class HelpDesk    {        ArrayList al = new ArrayList();        public HelpDesk()        {            SportsShoesDepartment ss = new SportsShoesDepartment();            al.Add(ss);            LeisureShoesDepartment ls = new LeisureShoesDepartment();            al.Add(ls);        }                public Shoes produceShoes(string shoesType)        {            Shoes shoes;            Console.WriteLine("
     <工厂公告>
      客户需要的鞋子类型是:{0}\n", shoesType);            foreach(ShoesFactoryDepartment sfd in al)            {                shoes = sfd.produceShoes(shoesType);                if (shoes != null)                {                    return shoes;                }            }            return null;        }    }}
     

ShoesFactoryDepartment

namespace FactoryMethod{    public abstract class ShoesFactoryDepartment    {        public abstract Shoes produceShoes(string shoesType);    }}

SportsShoesDepartment

namespace FactoryMethod{    public class SportsShoesDepartment: ShoesFactoryDepartment    {        public override Shoes produceShoes(string shoesType)        {            if (shoesType == "Sport")            {                return new SportShoes();            }            else            {                return null;            }        }    }}

LeisureShoesDepartment

namespace FactoryMethod{    public class LeisureShoesDepartment: ShoesFactoryDepartment    {        public override Shoes produceShoes(string shoesType)        {            if (shoesType == "Leisure")            {                return new LeisureShoes();            }            else            {                return null;            }        }    }}

Program

namespace FactoryMethod{    class Program    {        static void Main(string[] args)        {            HelpDesk helpDesk = new HelpDesk();            Console.WriteLine("请输入你想要的鞋子：Sport/Leisure");            string shoesType = Console.ReadLine();            Console.WriteLine("\n------进厂定制---------\n");            helpDesk.produceShoes(shoesType);            Console.WriteLine("\n-------鞋子出厂--------\n");                    }    }}

 

效果：