public class Main
{
    public static void method()
    {
        System.out.println("Main");
    }

    public static void main(String[] args)
    {
        Main m = new SubMain();
        m.method();
    }
}

class SubMain extends Main
{
    public static void method()
    {
        System.out.println("SubMain");
    }
}

在运行时,m指向Submain的一个实例,所以它应该在概念上打印“SubMain”.