static void Main(string[] args)
{
ChocolateBoiler boiler1 = ChocolateBoiler.GetInstance();
ChocolateBoiler boiler2 = ChocolateBoiler.GetInstance();
boiler1.Fill();
boiler2.Boil();
boiler1.Drain();
Console.Read();
}
static void Main(string[] args)
{
ChocolateBoiler chocolateBoiler = ChocolateBoiler.GetInstance();
chocolateBoiler.Fill();
ChocolateBoiler anotherChocolateBoiler = ChocolateBoiler.GetInstance();
anotherChocolateBoiler.Drain();
chocolateBoiler.Boil();
chocolateBoiler.Drain();
Console.ReadKey();
}