自定义类和集合

创建三个自定义类和集合。

animal类。

using System;
namespace a
{
	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("{0} has been fed.",name);
		}
	}
}

chicken类。

using System;
namespace a
{
	public class Chicken:Animal
	{
		public void LayEgg()
		{
			Console.WriteLine("{0} has laid an egg.",name);
		}
		public Chicken(string newName):base(newName)
		{
		}
	}
}

cow类。

using System;
namespace a
{
	public class Cow:Animal
	{
		public void Milk()
		{
			Console.WriteLine("{0} has been milked.",name);
		}
		public Cow(string newName):base(newName)
		{
		}
	}

}

programe.cs.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
namespace a
{
	class Program
	{
		static void Main(string[] args)
		{
			Console.WriteLine("Create an Array type collection of Animal"+"objects 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();
			Console.WriteLine("Create an ArrayList type collection of Animal"+"objects and use it:");
			ArrayList animalArrayList=new ArrayList();
			Cow myCow2=new Cow("Hayleg");
			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();
			Console.WriteLine("Additional manipulation of ArrayList:");
			animalArrayList.RemoveAt(0);
			((Animal)animalArrayList[0]).Feed();
			animalArrayList.AddRange(animalArray);
			((Chicken)animalArrayList[2]).LayEgg();
			Console.WriteLine("The animal called {0} is at index {1}.",myCow1.Name,animalArrayList.IndexOf(myCow1));
			myCow1.Name="Janice";
			Console.WriteLine("The animal is now called {0}.",((Animal)animalArrayList[1]).Name);
			Console.ReadKey();
		}
	}
}