using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace 打印机

{

   public class print

    {

       private static print instace = null;

       static object ce=new object();

       public static print Instace

       {

           get

           {

               if (instace == null)

               {

                   lock(ce)

                   {

                       if(instace==null)

                       {

                            instace = new print();

                            Console.WriteLine("测试");

                       }

                   }

               }

               return instace;

           }

       }

       public void prints(object msg)

       {

           string x = (string)msg;

           Console.WriteLine(x);

       }

    }

}