using System;

public class Program

{

    public static void Main()

    {

        FatherClass father = new FatherClass();

        SonClass son = new SonClass();

        DaughterClass daughter = new DaughterClass();

        GrandSonClass grandson = new GrandSonClass();

        FatherClass son_in_father_heart = new SonClass();

        FatherClass daughter_in_father_heart = new DaughterClass();

        FatherClass grandson_in_father_heart = new GrandSonClass();

        father.FirstBirthday();

        son.FirstBirthday();

        daughter.FirstBirthday();

        grandson.FirstBirthday();

        son_in_father_heart.FirstBirthday();

        daughter_in_father_heart.FirstBirthday();

        grandson_in_father_heart.FirstBirthday();

    }

}

​

​

public class FatherClass

{

    String title = "爸爸";

    public virtual void FirstBirthday() 

    {

        Console.WriteLine(title + "心裡想:你滿週歲就給我出去工作");

    }

}

​

public class SonClass:FatherClass

{

    String title = "兒子";

    public new void FirstBirthday()

    {

        Console.WriteLine(title + "心裡想:我什麼也不做,只想永遠在爸爸身邊");

    }

}

​

public class DaughterClass:FatherClass

{

    String title = "女兒";

    public override void FirstBirthday()

    {

        Console.WriteLine(title + "心裡想:我什麼也不做,只想永遠在爸爸身邊");

    }

}

​

public class GrandSonClass : DaughterClass

{

    String title = "孫子";

    public new void FirstBirthday()

    {

        Console.WriteLine(title + "心裡想:我什麼也不做,只想永遠在爺爺身邊");

    }

}