Java 字段不存在多态

 1 public class main{
 2     public static void main(string[] args) {
 3         a class = new a();
 4         system.out.println(class.a);
 5         system.out.println(class.geta());
 6         a aclass = new b();
 7         system.out.println(aclass.a);
 8         system.out.println(aclass.geta());
 9         b bclass = new b();
10         system.out.println(bclass.a);
11         system.out.println(bclass.geta());
12     }
13 }
14 
15 class a{
16     public int a = 0;
17     public int geta(){
18         return a;
19     }
20 }
21 
22 class b extends a{
23     public int a = 1;
24     public int geta(){
25         return a;
26     }
27 }

results：

0
0
0
1
1
1