public String outCar(String ticketnum) {
		if(ticketnum.equals("")){
			return "请输入你的取车票据号";
		}
		
		if(!contain(new Ticket(ticketnum))) {
		
			return "我们这没有停你的车。";
		}
		Car car = out(new Ticket(ticketnum));
		return "OK，车牌是[" + car.getCode() + "]，欢迎下次光临。";
	}