工厂方法

 1 abstract class LeiFeng
 2     {
 3         public abstract void Sweep();
 4         public abstract void Wash();
 5         public abstract void BuyRice();
 6     }
 7 
 8     class Undergraduate : LeiFeng
 9     {
10         public override void Sweep()
11         {
12             Console.WriteLine("在校大学生，扫地");
13         }
14 
15         public override void Wash()
16         {
17             Console.WriteLine("在校大学生，洗衣");
18         }
19 
20         public override void BuyRice()
21         {
22             Console.WriteLine("在校大学生，买米");
23         }
24     }
25 
26     class Volunteer : LeiFeng
27     {
28         public override void Sweep()
29         {
30             Console.WriteLine("志愿者，扫地");
31         }
32 
33         public override void Wash()
34         {
35             Console.WriteLine("志愿者，洗衣");
36         }
37 
38         public override void BuyRice()
39         {
40             Console.WriteLine("志愿者，买米");
41         }
42     }
43 
44     interface IFactory
45     {
46         LeiFeng CreateLeiFeng();
47     }
48 
49     class UndergraduateFactory : IFactory
50     {
51         public LeiFeng CreateLeiFeng()
52         {
53             return new Undergraduate();
54         }
55     }
56 
57     class VolunteerFactory : IFactory
58     {
59         public LeiFeng CreateLeiFeng()
60         {
61             return new Volunteer();
62         }
63     }
工厂方法
转自《大话设计模式》