1 interface A
2 {public void fintr();
3 }
4 class B implements A
5 {public void fintr(){
6 System.out.println("666");
7 }
8 }
9 class C implements A
10 {public void fintr(){
11 System.out.println("777");
12 }
13 }
14 class D
15 {public static A getInfo(String className){
16 if ("SSS".equals(className))
17 {
18 return new B();
19 }else if ("aa".equals(className))
20 {return new C();
21 }
22
23
24 return null;
25 }
26 }
27 public class vvv{
28 public static void main(String args[]){
29 A a= D.getInfo(args[0]);
30 if (a != null)
31 {
32 a.fintr();
33 }
34 }
35 }
