java创建一个租车公司类，其中包含私有属性车辆编号、车型和 价格，然后创建方法去访问和修改这些属性的测试类

下面是一个基本的租车公司类的实现：

public class CarRentalCompany {
    private int carId;
    private String carModel;
    private double price;

    public CarRentalCompany(int carId, String carModel, double price) {
        this.carId = carId;
        this.carModel = carModel;
        this.price = price;
    }

    public int getCarId() {
        return carId;
    }

    public void setCarId(int carId) {
        this.carId = carId;
    }

    public String getCarModel() {
        return carModel;
    }

    public void setCarModel(String carModel) {
        this.carModel = carModel;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

然后我们可以创建一个测试类来测试这个类的各个方法：

public class CarRentalCompanyTest {
    public static void main(String[] args) {
        CarRentalCompany car1 = new CarRentalCompany(1, "Toyota Camry", 150.0);
        System.out.println("Car " + car1.getCarId() + ": " + car1.getCarModel() + ", $" + car1.getPrice() + " per day");

        // 修改车辆信息
        car1.setPrice(200.0);
        System.out.println("New price for Car " + car1.getCarId() + ": $" + car1.getPrice() + " per day");
    }
}

输出结果：

Car 1: Toyota Camry, $150.0 per day
New price for Car 1: $200.0 per day

这样我们就可以创建一个租车公司类，并且使用测试类对其进行测试了。