using System;

using System.Threading;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        MyCounter counterOne = new MyCounter();

        MyCounter counterTwo = new MyCounter();

        Console.WriteLine("First some static counts");

        MyCounter.CountAndPrint();

        MyCounter.CountAndPrint();

        MyCounter.CountAndPrint();

        Console.WriteLine("Then some non-static counts");

        counterOne.PublicCountAndPrint();

        counterTwo.PublicCountAndPrint();

        counterOne.PublicCountAndPrint();

        counterTwo.PublicCountAndPrint();

        Console.WriteLine("Then we will test it with threads");

        Thread tid1 = new Thread(new ThreadStart(Thread1));

        Thread tid2 = new Thread(new ThreadStart(Thread2));

​

        tid1.Start();

        tid2.Start();

        tid1.Join();

        tid2.Join();

    }

    static void Thread1()

    {

        Console.WriteLine("Thread1: Hello World");

        Thread.Sleep(50);

        MyCounter counterOne = new MyCounter();

        MyCounter counterTwo = new MyCounter();

        Console.WriteLine("Thread1: First some static counts");

        MyCounter.CountAndPrint("Thread1: ");

        Thread.Sleep(50);

        MyCounter.CountAndPrint("Thread1: ");

        Thread.Sleep(50);

        MyCounter.CountAndPrint("Thread1: ");

        Thread.Sleep(50);

        Console.WriteLine("Thread1: Then some non-static counts");

        Thread.Sleep(50);

        counterOne.PublicCountAndPrint("Thread1: ");

        Thread.Sleep(50);

        counterTwo.PublicCountAndPrint("Thread1: ");

        Thread.Sleep(50);

        counterOne.PublicCountAndPrint("Thread1: ");

        Thread.Sleep(50);

        counterTwo.PublicCountAndPrint("Thread1: ");

        Thread.Sleep(50);

    }

    static void Thread2()

    {

        Console.WriteLine("Thread2: Hello World");

        Thread.Sleep(50);

        MyCounter counterOne = new MyCounter();

        MyCounter counterTwo = new MyCounter();

        Console.WriteLine("Thread2: First some static counts");

        MyCounter.CountAndPrint("Thread2: ");

        Thread.Sleep(50);

        MyCounter.CountAndPrint("Thread2: ");

        Thread.Sleep(50);

        MyCounter.CountAndPrint("Thread2: ");

        Thread.Sleep(50);

        Console.WriteLine("Thread2: Then some non-static counts");

        counterOne.PublicCountAndPrint("Thread2: ");

        Thread.Sleep(50);

        counterTwo.PublicCountAndPrint("Thread2: ");

        Thread.Sleep(50);

        counterOne.PublicCountAndPrint("Thread2: ");

        Thread.Sleep(50);

        counterTwo.PublicCountAndPrint("Thread2: ");

        Thread.Sleep(50);

    }

}

​

public class MyCounter

{

    private static object objectLock = new object();

    private static int counter = 0;

    public static void CountAndPrint()

    {

        counter++;

        Console.WriteLine(counter);

    }

    public static void CountAndPrint(string prefix)

    {

        counter++;

        Console.WriteLine(prefix + counter.ToString());

    }

    public void PublicCountAndPrint()

    {

        counter++;

        Console.WriteLine(counter);

    }

    public void PublicCountAndPrint(string prefix)

    {

        counter++;

        Console.WriteLine(prefix + counter.ToString());

    }

}