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class Fu
{
//  int num = 3;
    void show()
    {
        System.out.println("fu show");
    }

    static void method()
    {
        System.out.println("fu static method");
    }
}

class Zi extends Fu
{
//  int num = 4;
    void show()
    {
        System.out.println("zi show");
    }

    static void method()
    {
        System.out.println("zi static method");
    }
}



class  DuoTaiDemo3
{
    public static void main(String[] args)
    {
        Fu.method();
        Zi.method();
        Fu f = new Zi();//
//      f.method();
//      f.show();
//      System.out.println(f.num);


//      Zi z = new Zi();
//      System.out.println(z.num);
    }
}