C#入门教程之集合ArrayList用法详解

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
namespace 集合{
  //动物类
  public abstract class Animal
  {
    protected string name;   //动物的名字
    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()   //繁殖后代
    {
      Console.WriteLine("{0} has been fed.",name);
    }
  }
  //奶牛类
  public class Cow : Animal
  {
    public Cow(string newName): base(newName)
    { }
    public void Milk()   //产牛奶
    {
      Console.WriteLine("{0} has been milked.", name);
    }
  }
  //母鸡类
  public class Chicken : Animal
  {
    public Chicken(string newName):base(newName)
    { }
    public void LayEgg()  //下蛋
    {
      Console.WriteLine("{0} has laid an egg.", name);
    }
  }
  class Program
  {
    static void Main(string[] args)
    {
      //用数组的方法实现
      Console.WriteLine("Create an Array type collection of Animal object and use it:");
      Animal[] animalArray = new Animal[2];
      Cow myCow1 = new Cow("Deirdre");
      animalArray[0] = myCow1;
      animalArray[1] = new Chicken("Ken");
      foreach (Animal myAnimal in animalArray )
      {
        Console.WriteLine("New {0} object added to Array collection,Name={1}", myAnimal.ToString(), myAnimal.Name);
      }
      Console.WriteLine("Array collection contains {0} objects.",animalArray .Length );
      animalArray[0].Feed();
      ((Chicken)animalArray[1]).LayEgg();
      Console.WriteLine();
      //用集合的方法实现
      Console.WriteLine("Create an ArrayList type collection of Animal objects and use it;");
      ArrayList animalArrayList = new ArrayList();
      Cow myCow2 = new Cow("HayLey");
      animalArrayList.Add(myCow2);
      animalArrayList.Add(new Chicken("Roy"));
      foreach (Animal myAnimal in animalArrayList)
      {
        Console.WriteLine("New {0} object added to ArrayList collection,Name={1}", myAnimal.ToString(), myAnimal.Name);
      }
      Console.WriteLine("ArrayList collection contains {0} objects.", animalArrayList.Count);
      ((Animal)animalArrayList[0]).Feed();
      ((Chicken)animalArrayList[1]).LayEgg();
      Console.WriteLine();
    }
  }
}

Animal[] animalArray = new Aimal[2];

ArrayList animalArrayList = new ArrayList();

Cow myCow2 = new Cow("Hayley");
anmialArrayList.Add(myCow2);
anmialArrayList.Add(new Chicken("Roy"));

foreach (Animal myAnimal in animalArrayList)
{
  Console.WriteLine("New {0} object added to ArrayList collection,Name = {1}",myAnimal.Tostring(),myAnimal.Name);
}

((Animal)animalArrayList[0]).Feed();
((Chichen)animalArrayList[1]).LayEgg();

animalArrayList.RemoveAt(0);
animalArrayList.Remove(myCow2);

animalArrayList.AddRange(animalArray);