design a parking lot OOD

Clarify requirement

• basic function: in and out
• size, types(moto, handicap, bus, car, )
• capacity
• levels
• enters
• monitoring to show the vacant space
• change the fee

Define class

• Parking lot
• Parking spot
• Parking ticket

Define field

• Parking lot
  • Map<location, parkingSpot>
  • Map<location, parkingTicket>
  • capacity
• Parking spot
  • parking location (ABCDE + no.)
• Parking ticket
  • parking location
  • enter/exit timestamp
  • charge fee ratio/amount

Define method, how data flow works

• Parking lot class
• Ticket park(String vehicle type)
• ticket exit (Ticket ticket)

data flow -> parking vehicle -> according to vehicle type assign spot and return ticket

exit -> release spot, take ticket calculate fee charge -> return ticket as purpose of receipt