class A
{
    public void f()
        {
        System.out.printf("AAAA\n");
        }
    }
    class B    extends A
    {
        public void f()
        {
        System.out.printf("BBBB\n");
        }
    class C extends B
    {
        public void f()
        {
        System.out.printf("CCCC\n");
        }
        }   
        public class TestA
        {
                public static void G()
                {
                }
            public static void main(String[] args)
            {
                G();
                }
            }
不会调，哪错了呢