简单工厂模式(simple factory )

 1 /*工厂类   （Creator）角色*/
 2 　　package simplefactory;
 3 public class Creator
 4 {
 5     public static Product createProduct(String str)
 6     {
 7         if("A".equals(str))
 8         {
 9             return new ConcreteProductA();
10         }
11         else if("B".equals(str))
12         {
13             return new ConcreteProductB();
14         }
15         
16         return null;
17     }
18 }
19 
20 /*抽象产品（Product）角色*/
21 package simplefactory;
22 public abstract class Product
23 {
24 
25 }
26 
27 /*具体产品（Concrete Product）角色*/
28 package simplefactory;
29 public class ConcreteProductA extends Product
30 {
31 
32 }
33 /*具体产品（Concrete Product）角色*/
34 package simplefactory;
35 public class ConcreteProductB extends Product
36 {
37 
38 }
39 
40 package simplefactory;
41 public class Client
42 {
43     public static void main(String[] args)
44     {
45         Product productA = Creator.createProduct("A");
46         
47         System.out.println(productA.getClass().getName());
48         
49         Product productB = Creator.createProduct("B");
50         
51         System.out.println(productB.getClass().getName());
52     }
53 }