汽车租赁系统预订车功能主要代码JAVA语言

以下是一个简单的汽车租赁系统预订车功能的主要代码，使用JAVA语言实现：

import java.util.ArrayList;

public class CarRentalSystem {
    private ArrayList<Car> availableCars = new ArrayList<Car>();
    private ArrayList<Car> rentedCars = new ArrayList<Car>();

    public CarRentalSystem(ArrayList<Car> cars) {
        this.availableCars = cars;
    }

    public void displayAvailableCars() {
        System.out.println("Available cars:");
        for (Car car : availableCars) {
            System.out.println(car.getDetails());
        }
    }

    public void rentCar(int carId) {
        Car car = findCar(carId);
        if (car != null) {
            availableCars.remove(car);
            rentedCars.add(car);
            System.out.println("Car " + carId + " rented successfully.");
        } else {
            System.out.println("Car " + carId + " not available for rent.");
        }
    }

    public void returnCar(int carId) {
        Car car = findCar(carId);
        if (car != null) {
            rentedCars.remove(car);
            availableCars.add(car);
            System.out.println("Car " + carId + " returned successfully.");
        } else {
            System.out.println("Invalid car ID.");
        }
    }

    private Car findCar(int carId) {
        for (Car car : availableCars) {
            if (car.getId() == carId) {
                return car;
            }
        }
        for (Car car : rentedCars) {
            if (car.getId() == carId) {
                return car;
            }
        }
        return null;
    }
}

public class Car {
    private int id;
    private String make;
    private String model;
    private int year;
    private double pricePerDay;
    private boolean isAvailable;

    public Car(int id, String make, String model, int year, double pricePerDay, boolean isAvailable) {
        this.id = id;
        this.make = make;
        this.model = model;
        this.year = year;
        this.pricePerDay = pricePerDay;
        this.isAvailable = isAvailable;
    }

    public int getId() {
        return id;
    }

    public String getMake() {
        return make;
    }

    public String getModel() {
        return model;
    }

    public int getYear() {
        return year;
    }

    public double getPricePerDay() {
        return pricePerDay;
    }

    public boolean isAvailable() {
        return isAvailable;
    }

    public String getDetails() {
        return "Car ID: " + id + ", Make: " + make + ", Model: " + model + ", Year: " + year + ", Price per day: " + pricePerDay + ", Available: " + isAvailable;
    }
}

使用方式：

1. 创建一个 `Car` 对象的数组或列表，将所有可用的车辆添加到其中。
2. 创建一个 `CarRentalSystem` 对象，将该数组或列表传递给构造函数。
3. 调用 `displayAvailableCars` 方法，显示当前可用的车辆。
4. 调用 `rentCar` 方法，传递要租赁的车辆的 ID。
5. 如果租赁成功，调用 `returnCar` 方法，传递已租赁车辆的 ID，将车辆归还。

注意：此代码仅为示例，实际系统需要更多功能和错误处理。