java 编写Car类继承于Vehicles是什么意思

编写Car类继承于Vehicles是什么意思？什么是继承于？

Vehicles指交通工具类，交通工具有很多子类。

public class Vehicles {

    private String brand;
    private String color;
    
    public Vehicles() {}
    public Vehicles(String brand,String color) {
        this.brand = brand;
        this.color = color;
    }
    
    public String getBrand() {
        return brand;
    }
    public void setBrand(String brand) {
        this.brand = brand;
    }
    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }
    public void run() {
        System.out.println("我已经开动");
    }
    public void showInfo() {
        System.out.println("商标："+brand+",颜色：" + color);
    }
}

public class Car extends Vehicles{

    private int seats;
    
    
    public int getSeats() {
        return seats;
    }
    public Car() {}
    public Car(String brand,String color,int seats) {
        super(brand,color);
        this.seats = seats;
    }
    

    public void setSeats(int seats) {
        this.seats = seats;
    }


    public void showCar() {
        super.showInfo();
        System.out.println("座位数："+seats);
    }
}

public class Truck extends Vehicles{

    private float load;
    
    public Truck() {}
    public Truck(String brand,String color,float load) {
        super(brand,color);
        this.load = load;
    }
    
    public float getLoad() {
        return load;
    }


    public void setLoad(float load) {
        this.load = load;
    }

    public void showTruck() {
        super.showInfo();
        System.out.println("载重量：" + load);
    }
}

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