using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        INoisyItem Fido = new Dog("Fido");

        Fido.Noise();

        Tractor JD = new Tractor();

        Console.WriteLine("JD is in {0}", JD.getCurrentGear());

        JD.shiftUp();

        Console.WriteLine("JD is in {0}", JD.getCurrentGear());

        List<INoisyItem> FarmThings = new List<INoisyItem>();

        FarmThings.Add(Fido);

        FarmThings.Add(JD);

        // Test for nameless doggo

        INoisyItem NoNameDog = new Dog();

        FarmThings.Add(NoNameDog);

        foreach(INoisyItem FT in FarmThings){

            FT.Noise();

        }

    }

    interface INoisyItem

    {

        void Noise();

    }

    class Dog : INoisyItem{

        // Attributes

        private string name;

        // Contructors

        public Dog() {}

        public Dog(string n){

            name = n;

        }

        // Methods

        public void Noise(){

            if (this.name != null){

                Console.WriteLine("{0} woofs \"Bark, bark!\"", name);

            }

            else

            {

                Console.WriteLine("Bark, bark!");

            }

        }

    }

    class Tractor : INoisyItem{

        // Attributes

        private int currentGear = 1;

        // Methods

        public void Noise(){

            Console.WriteLine("Vroom, vroom");  

        }

        public void shiftUp(){

            currentGear++;

        }

        public int getCurrentGear(){

            return currentGear; 

        }

    }

}