外观模式

 1 public interface Biz {
 2 
 3     void doBiz();
 4 }
 5 
 6 public class FirstBiz implements Biz {
 7 
 8     @Override
 9     public void doBiz() {
10         System.out.println("first biz");
11     }
12 }
13 
14 public class SecondBiz implements Biz {
15 
16     @Override
17     public void doBiz() {
18         System.out.println("second biz");
19     }
20 }

 1 public class BizFacade {
 2 
 3     private FirstBiz firstBiz = new FirstBiz();
 4 
 5     private SecondBiz secondBiz = new SecondBiz();
 6 
 7     public void doFirstBiz() {
 8         firstBiz.doBiz();
 9     }
10 
11     public void doSecondBiz() {
12         secondBiz.doBiz();
13     }
14 }

1 public class Main {
2 
3     public static void main(String[] args) {
4         BizFacade bizFacade = new BizFacade();
5         bizFacade.doFirstBiz();
6         bizFacade.doSecondBiz();
7     }
8 }