1. package packa;
   
2. public class DemoA extends packb.DemoB{
   
3. public void show(){
   
4. method();
   
5. System.out.println("demoa show run");
   
6.    }
   
7. }
   
8. 
   
9. 结果是   demoa show run
   
10.             Hello Package!
    
11. 
    
12. package packb;
    
13. public class DemoB{
    
14. protected void method(){
    
15. System. out.println("demob show run"         );
    
16.   }
    
17. }
    
18. 
    
19. package mypack;
    
20. class PackageDemo{
    
21. public static void main(String[] args){
    
22. packa.DemoA d = new packa.DemoA();
    
23. d.show();
    
24. packb.DemoB b = new packb.DemoB();
    
25.   //b.method();// 报错！无法访问 DemoB 中的 protected 修饰的 method 方法
    
26.   System.out.println("Hello Package!");
    
27.   }
    
28. }

复制代码

1. package packa;
   
2. public class DemoA extends packb.DemoB{
   
3. public void show(){
   
4. method();
   
5. System.out.println("demoa show run");
   
6.    }
   
7. }
   
8. 
   
9. 结果是   demoa show run
   
10.             Hello Package!
    
11. 
    
12. package packb;
    
13. public class DemoB{
    
14. protected void method(){
    
15. System. out.println("demob show run"         );
    
16.   }
    
17. }
    
18. 
    
19. package mypack;
    
20. class PackageDemo{
    
21. public static void main(String[] args){
    
22. packa.DemoA d = new packa.DemoA();
    
23. d.show();
    
24. packb.DemoB b = new packb.DemoB();
    
25.   //b.method();// 报错！无法访问 DemoB 中的 protected 修饰的 method 方法
    
26.   System.out.println("Hello Package!");
    
27.   }
    
28. }

复制代码