public SoldOutState(GumballMachine gumballMachine) { this.gumballMachine = gumballMachine; }
public WinnerState(GumballMachine gumballMachine) { this.gumballMachine = gumballMachine; }
public NoQuarterState(GumballMachine gumballMachine) { this.gumballMachine = gumballMachine; }