public static BMW createBMW()
{
if (bmw == null)
{
bmw = new BMW();
}
return(bmw);
}
static void Main(string[] args)
{
Toyota t = Toyota.createToyota();
BMW b = BMW.createBMW();
Thread thread1 = new Thread(t.run); //Put the Toyota in thread and start run
Thread thread2 = new Thread(b.run); //Put the BMW in thread and start run
Console.WriteLine("Call the run() of the Toyota:");
thread1.Start(); //Start thread1
thread1.Join(); //Wait until the thread1 ends
Console.WriteLine("Call the run() of the BMW:");
thread2.Start(); //Start thread2
} //The obtained result same from question 1