public abstract class Vehicle {  protected String licensePlate;  protected int spotsNeeded;  protected VehicleSize size;  public Vehicle(String licensePlate VehicleSize size) {  this.licensePlate = licensePlate;  this.size = size;  this.spotsNeeded = (size == VehicleSize.Large) ? 5 : 1;  }  public int getSpotsNeeded() {  return spotsNeeded;  }  public VehicleSize getSize() {  return size;  }  public String getLicensePlate() {  return licensePlate;  }  public abstract boolean canFitInSpot(ParkingSpot spot); } 

public class Bus extends Vehicle {  public Bus(String licensePlate) {  super(licensePlate VehicleSize.Large);  }  public boolean canFitInSpot(ParkingSpot spot) {  return spot.getSpotSize() == VehicleSize.Large;  } } 

public class Car extends Vehicle {  public Car(String licensePlate) {  super(licensePlate VehicleSize.Compact);  }  public boolean canFitInSpot(ParkingSpot spot) {  return spot.getSpotSize() == VehicleSize.Compact || spot.getSpotSize() == VehicleSize.Large;  } } 

public class Motorcycle extends Vehicle {  public Motorcycle(String licensePlate) {  super(licensePlate VehicleSize.Motorcycle);  }  public boolean canFitInSpot(ParkingSpot spot) {  return true; // Can park in any spot  } } 

public class ParkingSpot {  private Vehicle vehicle;  private VehicleSize spotSize;  private int row;  private int spotNumber;  private Level level;  public ParkingSpot(Level level int row int spotNumber VehicleSize spotSize) {  this.level = level;  this.row = row;  this.spotNumber = spotNumber;  this.spotSize = spotSize;  this.vehicle = null;  }  public boolean isAvailable() {  return vehicle == null;  }  public boolean canFitVehicle(Vehicle vehicle) {  return isAvailable() && vehicle.canFitInSpot(this);  }  public void parkVehicle(Vehicle vehicle) {  if (canFitVehicle(vehicle)) {  this.vehicle = vehicle;  }  }  public void removeVehicle() {  this.vehicle = null;  }  public VehicleSize getSpotSize() {  return spotSize;  }  public int getRow() {  return row;  }  public int getSpotNumber() {  return spotNumber;  } } 

public class Level {  private int levelNumber;  private ParkingSpot[] spots;  public Level(int levelNumber int numSpots) {  this.levelNumber = levelNumber;  this.spots = new ParkingSpot[numSpots];  }  public boolean parkVehicle(Vehicle vehicle) {  for (ParkingSpot spot : spots) {  if (spot.canFitVehicle(vehicle)) {  spot.parkVehicle(vehicle);  return true;  }  }  return false;  }  public boolean removeVehicle(Vehicle vehicle) {  for (ParkingSpot spot : spots) {  if (spot.isOccupied() && spot.getVehicle().equals(vehicle)) {  spot.removeVehicle();  return true;  }  }  return false;  } } 

public class ParkingLot {  private Level[] levels;  public ParkingLot(int numLevels int numSpotsPerLevel) {  levels = new Level[numLevels];  for (int i = 0; i < numLevels; i++) {  levels[i] = new Level(i numSpotsPerLevel);  }  }  public boolean parkVehicle(Vehicle vehicle) {  for (Level level : levels) {  if (level.parkVehicle(vehicle)) {  return true;  }  }  return false; // Parking failed (no spots available)  }  public boolean removeVehicle(Vehicle vehicle) {  for (Level level : levels) {  if (level.removeVehicle(vehicle)) {  return true;  }  }  return false; // Removal failed (vehicle not found)  } } 

public class Ticket {  private Vehicle vehicle;  private Date issueTime;  private Date exitTime;  public Ticket(Vehicle vehicle) {  this.vehicle = vehicle;  this.issueTime = new Date();  }  public void setExitTime(Date exitTime) {  this.exitTime = exitTime;  }  public long getDuration() {  return (exitTime.getTime() - issueTime.getTime()) / 1000; // Time in seconds  } } 

عام فصل خدمة الدفع {  عام مزدوج com.calculateFee(تذكرة تذكرة) {  طويل مدة = تذكرة.getDuration()؛  // نموذج رسوم بسيط: `text`=