Design a parking lot system using OOD principles
Reported in JPMorgan Chase interview loops. Object-oriented design classic testing modeling and extensibility.
Interview scenario
Context for JPMorgan Chase candidates:
Support multiple floors, spot types, tickets, and payment processing.
Model answer
Try answering aloud first
Cover trade-offs, structure, and a concrete example before revealing the baseline response.
How to frame this at JPMorgan Chase: Connect your answer to measurable impact, clarity of thought, and trade-offs the team cares about. Below is a strong baseline response you can adapt with your own project examples.
Identify core entities first: ParkingLot, Floor, Spot, Vehicle, Ticket, and Payment. Model spot assignment rules through a strategy interface so policies can vary by vehicle type or peak hours.
Encapsulate state transitions clearly, such as ticket issued, occupied, paid, and exited. Keep responsibilities cohesive: availability management should not be mixed with billing logic.
Good interview answers include extensibility points like reservation support, electric charging spots, and admin reporting without rewriting core classes.
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