ex-04-05

来自「Programming Csharp Source Code(代码) Prog」· 代码 · 共 35 行

//Example 04-05: Using static fields for instance counting

using System;

public class Cat
{

     public Cat()
     {
          instances++;  
     }

     public static void HowManyCats()
     {
          Console.WriteLine("{0} cats adopted",
                instances);
     }
     private static int instances = 0;
}

public class Tester
{
     static void Main()
     {
           Cat.HowManyCats();
           Cat frisky = new Cat();
           Cat.HowManyCats();
           Cat whiskers = new Cat();
           Cat.HowManyCats();

     }

}