🅿️ Java Parking Lot System

A fully object-oriented parking lot simulation built in Java. This system models real-world parking behavior using size-based constraints and a 2D parking matrix.

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🚗 Car & Spot Size Rules

The parking system supports 3 sizes of cars and spots:

• SMALL (1 unit)
• MEDIUM (2 units)
• LARGE (3 units)

Parking Fit Logic:

• A car can fit into a spot if its numberOfCells ≤ the spot's numberOfCells.
• This logic is encapsulated in the Size enum method:

  public boolean canFitIn(Size spotSize)

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📦 Structure

Class	Description
Size	Enum defining SMALL, MEDIUM, and LARGE sizes and their capacities
Car	Represents a vehicle with a specific Size
ParkingCell	A parking space with a size and occupancy state
ParkingRow	A row of parking cells
ParkingMatrix	2D grid of rows managing overall parking operations

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✅ Features

• ✅ Size-aware parking enforcement
• ✅ Simple parking algorithm (first-fit in matrix)
• ✅ printStatus() shows lot occupancy at a glance
• ✅ Fully modular and extendable for:
  • Floors
  • Parking tickets
  • Unparking and billing logic
  • Multi-threaded gate systems

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🧪 Sample Usage

ParkingCell c1 = new ParkingCell(Size.SMALL);
ParkingCell c2 = new ParkingCell(Size.MEDIUM);
ParkingCell c3 = new ParkingCell(Size.LARGE);

ParkingRow row1 = new ParkingRow(List.of(c1, c2, c3));
ParkingMatrix lot = new ParkingMatrix(List.of(row1));

Car small = new Car(Size.SMALL);
Car large = new Car(Size.LARGE);

lot.parkCar(small); // parks in SMALL
lot.parkCar(large); // parks in LARGE

lot.printStatus();  // Output: Row 0: [X][ ][X]

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🛠️ Getting Started

1. Clone this repo:

   git clone https://github.com/yourusername/java-parking-lot.git
   cd java-parking-lot

2. Compile & Run:

   javac *.java
   java Main

Note: You can also open this in any Java IDE (e.g., IntelliJ, Eclipse, VS Code with Java extensions).

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📌 Future Improvements

• Add a ParkingLot class with multiple ParkingMatrix floors
• Implement unpark() with timestamps and payment logic
• Add a CLI or web interface to interact with the system

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📄 License

MIT License – Feel free to fork, build, and extend this however you like.

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👨‍💻 Created for OOP interview prep and design mastery.