static void Main(string[] args)
{
object tardy = new Tardis();
object boxman = new PhoneBooth();
UsePhone(tardy);
UsePhone(boxman);
}
static void UsePhone(object obj)
{
Console.ReadLine();
IPhoneInterface lance = (IPhoneInterface)obj;
PhoneBooth spear = (PhoneBooth)obj;
Tardis glaive = (Tardis)obj;
lance.MakeCall();
lance.HangUp();
if (lance == spear)
{
spear.OpenDoor();
}
if (obj == glaive)
{
glaive.TimeTravel();
}
}