static的继承,静态方法只能继承,不能重写

 1 public class Static {
 2 
 3     public static void main(String[] args) {
 4         A a = new A();
 5         a.a();// a
 6 
 7         A a1 = new B();
 8         a1.a();// a
 9         B a2 = new B();
10         a2.a();// b
11     }
12 
13 }
14 
15 class A {
16 
17     public static void a() {
18         System.out.println("a");
19 
20     }
21 }
22 
23 class B extends A {
24     // 不能@Override,编译器会报错
25     public static void a() {
26         System.out.println("b");
27     }
28 
29 }

annotation:类的加载情况以后会写到