工場モード!@——@

 1 package zzuli.acmen.my.factory;
 2 
 3 import java.util.HashMap;
 4 import java.util.Map;
 5 
 6 public class Factory {
 7     
 8     Map<String,Object> map = new HashMap<String,Object>();
 9     
10     public void setObject(String str){
11         
12         // 
13         try {
14             /*
15              *  。 Object 
16 */
17             Class c = Class.forName(str);
18             Object o = c.newInstance();
19             map.put(str, o);
20         } catch (ClassNotFoundException e) {
21             // TODO Auto-generated catch block
22             e.printStackTrace();
23         } catch (InstantiationException e) {
24             // TODO Auto-generated catch block
25             e.printStackTrace();
26         } catch (IllegalAccessException e) {
27             // TODO Auto-generated catch block
28             e.printStackTrace();
29         }
30         
31         
32     }
33     
34     public Object getObject(String str){
35         
36         Object o = map.get(str);
37         
38         return o;
39         
40     }
41 }
42 
43 interface Person{
44     
45     public void say(String str);
46     
47 }
48 
49 class One implements Person{
50 
51     public void say(String str) {
52         System.out.println(" "+str);
53         
54     }
55     
56 }
57 
58 class Two implements Person{
59 
60     public void say(String str) {
61         System.out.println(" "+str);
62         
63     }
64     
65 }

 1 package zzuli.acmen.my.factory;
 2 
 3 public class Main {
 4 
 5     /**
 6      * @param args
 7 */
 8     public static void main(String[] args) {
 9         
10         Factory f = new Factory();
11         /*
12          *  ；
13 */
14         f.setObject("zzuli.acmen.my.factory.One");
15         f.setObject("zzuli.acmen.my.factory.Two");
16         
17         /*
18          *  Object  ， 
19 */
20         Person p = (Person)f.getObject("zzuli.acmen.my.factory.One");
21         p.say(" ");
22         Person pp = (Person)f.getObject("zzuli.acmen.my.factory.Two");
23         pp.say(" ");
24         Person p1 = (Person)f.getObject("zzuli.acmen.my.factory.One");
25         p1.say(" ");
26         
27     }
28 
29 }