写一个停车场管理系统Java代码

好的，下面是一个简单的停车场管理系统Java代码示例，供您参考：

import java.util.*;

public class ParkingLot {
    private int capacity;
    private Map<String, Car> parkedCars;

    public ParkingLot(int capacity) {
        this.capacity = capacity;
        this.parkedCars = new HashMap<>();
    }

    public boolean parkCar(Car car) {
        if (parkedCars.size() >= capacity) {
            System.out.println("No available parking space!");
            return false;
        }
        parkedCars.put(car.getLicensePlate(), car);
        System.out.println("Car parked successfully!");
        return true;
    }

    public void removeCar(String licensePlate) {
        if (!parkedCars.containsKey(licensePlate)) {
            System.out.println("Car not found!");
            return;
        }
        parkedCars.remove(licensePlate);
        System.out.println("Car removed successfully!");
    }

    public void displayParkedCars() {
        if (parkedCars.isEmpty()) {
            System.out.println("No cars parked!");
            return;
        }
        System.out.println("Parked cars:");
        for (Car car : parkedCars.values()) {
            System.out.println(car.toString());
        }
    }
}

class Car {
    private String licensePlate;
    private String ownerName;

    public Car(String licensePlate, String ownerName) {
        this.licensePlate = licensePlate;
        this.ownerName = ownerName;
    }

    public String getLicensePlate() {
        return licensePlate;
    }

    public String getOwnerName() {
        return ownerName;
    }

    public String toString() {
        return licensePlate + " - " + ownerName;
    }
}

class Main {
    public static void main(String[] args) {
        ParkingLot parkingLot = new ParkingLot(5);
        Car car1 = new Car("ABC123", "John");
        Car car2 = new Car("DEF456", "Sarah");
        Car car3 = new Car("GHI789", "Peter");
        parkingLot.parkCar(car1);
        parkingLot.parkCar(car2);
        parkingLot.parkCar(car3);
        parkingLot.displayParkedCars();
        parkingLot.removeCar("DEF456");
        parkingLot.displayParkedCars();
    }
}

以上代码实现了一个简单的停车场管理系统，包含了停车、取车、显示当前停车场内车辆信息等功能。您可以根据自己的需求进行修改和扩展。