using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
class Program
{
static void Main(string[] args)
{
Animals animalCollection = new Animals();
animalCollection.Add(new Cow("A"));
animalCollection.Add(new Chicken("B"));
foreach (Animal myAnimal in animalCollection)
{
myAnimal.Feed();
}
}
}
public abstract class Animal
{
protected string name;
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
public Animal()
{
name = "The animal with no name";
}
public Animal(string newName)
{
name = newName;
}
public void Feed()
{
Console.WriteLine("feed:"+ name);
}
}
public class Chicken : Animal
{
public void LayEgg()
{
Console.WriteLine("chicken:"+name);
}
public Chicken(string newName): base(newName)
{
}
}
public class Cow : Animal
{
public void Milk()
{
Console.WriteLine("Milk:"+name);
}
public Cow(string newName): base(newName)
{
}
}
public class Animals : CollectionBase
{
public void Add(Animal newAnimal)
{
List.Add(newAnimal);
}
public void Remove(Animal newAnimal)
{
List.Remove(newAnimal);
}
public Animals()
{
}
public Animal this[int animalIndex]
{
get
{
return (Animal)List[animalIndex];
}
set
{
List[animalIndex] = value;
}
}
}
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