c#使用静字段

静态成员变量通常用来保存当前类的实例数目。

#region Using directives

using System;

using System.Collections.Generic;

using System.Text;

#endregion

namespace StaticFields

{

     public class Cat

{

private static int instances = 0;

public Cat ()

{

  instances++;

}

public static void HowManyCats ()

{

  Console.WriteLine ( "{0} cats adopted",instances );

}

}

public class Tester

{

   statice void Main ()

{

  Cat.HowManyCats ();

  Cat.frisky = new Cat ();

  Cat.HowManyCats ();

  Cat.whiskers = new Cat ();

  Cat.HowManyCats ();

}

}

}

//静态成员设为private,公共访问方法HowManyCats()提供对私有成员的访问方式。