public SoldState(GumballMachine gumballMachine) { _gumballMachine = gumballMachine; }
public NoQuarterState(GumballMachine gumballMachine) { this.gumballMachine = gumballMachine; }
public HasQuaterState(GumballMachine gumballMachine) { this.gumballMachine = gumballMachine; }