static void Main(string[] args)
{
Tardis mytardis = new Tardis();
PhoneBooth mybooth = new PhoneBooth();
UsePhone(mytardis);
UsePhone(mybooth);
}
static void UsePhone(object obj)
{
PhoneInterface phone = (PhoneInterface)obj;
phone.MakeCall();
if (obj.GetType() == typeof(PhoneBooth))
{
PhoneBooth booth = (PhoneBooth)obj;
booth.OpenDoor();
}
else if (obj.GetType() == typeof(Tardis))
{
Tardis tardis = (Tardis)obj;
tardis.TimeTravel();
}
}