Class Car
- int id
- boolean businessClass
- static final double BUSINESS_SEAT_COST
- static final double ECONOMY_SEAT_COST
- static final int BUSINESS_SEATS
- static final int ECONOMY_SEATS
- Seat[] seats

+ Car(int carId, boolean isBusinessClass)
+ Seat[] seats()
+ boolean isBusinessClass()
+ int id()
- void printTicket(int seatNo)
+ boolean bookNextSeat()
+ boolean cancelSeat(int seatNo)


busClCar1
|- id: 1
|- businessClass: true
|- seats: [Seat, Seat, Seat]
  |- Seat
    |- number: 1
    |- cost: 125.0
    |- booked: false
  |- Seat
    |- number: 2
    |- cost: 125.0
    |- booked: true
  |- Seat
    |- number: 3
    |- cost: 125.0
    |- booked: true
	
	