定义一个交通工具的类

请定义一个交通工具的类，其中有属性：速度，体积，方法：移动，设置速度，加速，减速 最后实例化一个交通工具

public class Vehicle {

    public static void main(String[] args) {
        Vehicle1 v = new Vehicle1();

        v.move();
        
        v.setSpeed(0);
        v.setSize(5);

        System.out.println("speed:" + v.getSpeed());
        System.out.println("size:" + v.getSize());

        v.speedUp(10);
        System.out.println("speed:" + v.getSpeed());

        v.speedDown(10);
        System.out.println("speed:" + v.getSpeed());

    }
}

class Vehicle1{

    private int speed;
    private int size;

    public int getSpeed() {
        return speed;
    }

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

    public int getSize() {
        return size;
    }

    public void setSize(int size) {
        this.size = size;
    }

    public Vehicle1(int speed, int size) {
        this.speed = speed;
        this.size = size;
    }

    public Vehicle1() {
    }

    public void move(){
        System.out.println("公共汽车开始起步");
    }

    public void speedUp(int addSpeed){
        this.setSpeed(this.getSpeed() + addSpeed);
    }

    public void speedDown(int subSpeed){
        this.setSpeed(this.getSpeed() - subSpeed);
    }
}

输出结果：