想请教一个问题，用最基础的语言就可以

2.请定义一个交通工具(Vehicle)类，其具有的属性和方法如下:
属性:
1)速度-speed;2)长度-length;3)宽度-width; 4)高度-height;
方法:
1)移动-move()
2)加速-speedUp(int num)
num:表示在当前速度上增加的速度值
3)减速-speedDown(int num)
num:表示在当前速度上减低的速度值
4)对Vehicle 类的各个内部字段使用 setter/getter进行封装
5)创建测试代码，设置输出一个Vehicle对象的各个属性，并测试speedUp() 和 speedDown()方法。

public class Vehicle {
    private double speed;
    private double length;
    private double width;
    private double height;

    public Vehicle(double speed, double length, double width, double height) {
        this.speed = speed;
        this.length = length;
        this.width = width;
        this.height = height;
    }

    public void move() {
        System.out.println("Vehicle is moving.");
    }

    public void speedUp(double num) {
        speed += num;
        System.out.printf("Vehicle speed increased by %.2f. Current speed: %.2f \n", num, speed);
    }

    public void speedDown(double num) {
        speed -= num;
        if (speed < 0) {
            speed = 0;
        }
        System.out.printf("Vehicle speed decreased by %.2f. Current speed: %.2f \n", num, speed);
    }

    public void setSpeed(double speed) {
        this.speed = speed;
    }

    public double getSpeed() {
        return speed;
    }

    public void setLength(double length) {
        this.length = length;
    }

    public double getLength() {
        return length;
    }

    public void setWidth(double width) {
        this.width = width;
    }

    public double getWidth() {
        return width;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public double getHeight() {
        return height;
    }
}

测试代码

public class VehicleTest {
    public static void main(String[] args) {
        Vehicle car = new Vehicle(50, 4.5, 2, 1.8);

        System.out.printf("车速：%.2f km/h%n", car.getSpeed());
        System.out.printf("车长：%.2f m%n", car.getLength());
        System.out.printf("车宽：%.2f m%n", car.getWidth());
        System.out.printf("车高：%.2f m%n", car.getHeight());

        car.speedUp(10);
        car.speedDown(5);

        car.setLength(5);
        car.setWidth(2.3);
        car.setHeight(1.6);

        System.out.printf("车长：%.2f m%n", car.getLength());
        System.out.printf("车宽：%.2f m%n", car.getWidth());
        System.out.printf("车高：%.2f m%n", car.getHeight());
    }
}