public IGumballMachineState TurnLever()
{
Console.WriteLine("Purchase successful.");
return(NoCoinState.GetInstance());
}
public static IGumballMachineState GetInstance()
{
return(_instance ?? (_instance = new NoCoinState()));
}
public IGumballMachineState EjectCoin()
{
Console.WriteLine("Coin ejected.");
return(NoCoinState.GetInstance());
}