using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication53
{
    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;
            }
        }
    }
}
--------------------------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication53
{
    class Program
    {
        static void Main(string[] args)
        {
            Animals animalCollection = new Animals();
            animalCollection.Add(new Cow("Jack"));
            animalCollection.Add(new Chicken("Vera"));
            foreach (Animal myAnimal in animalCollection)
            {
                myAnimal.Feed();
            }
            Console.ReadKey();
        }
    }
}
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问题是：animalCollections对象调用了类Animals中的Add方法，Add方法中的List是什么东东，如果是添加一个对象，如“Jack”的话，那么animalCollections本身就是对象，向他添加一个对象是什么意思呢？难道和ArrayList定义的对象是一样意思吗？求高手解答，在线等

list是arrylist的泛型版本。