Java面向对象编程：交通工具类、小汽车类和卡车类的设计与实现

public class Vehicles {
    String brand;
    String color;

    public Vehicles(String brand, String color) {
        this.brand = brand;
        this.color = color;
    }

    public void run() {
        System.out.println('我已经开动了');
    }

    public void showInfo() {
        System.out.println('商标：' + brand + '，颜色：' + color);
    }
}

public class Car extends Vehicles {
    int seats;

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

    public void showCar() {
        System.out.println('这是一辆' + color + '的' + brand + '小汽车，有' + seats + '个座位');
    }
}

public class Truck extends Vehicles {
    float load;

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

    public void showTruck() {
        System.out.println('这是一辆' + color + '的' + brand + '卡车，载重' + load + '吨');
    }
}

public class Main {
    public static void main(String[] args) {
        Car car = new Car('宝马', '黑色', 5);
        car.showInfo();
        car.showCar();

        Truck truck = new Truck('东风', '红色', 10.5f);
        truck.showInfo();
        truck.showTruck();
    }
}

输出结果为：

商标：宝马，颜色：黑色
这是一辆黑色的宝马小汽车，有5个座位
商标：东风，颜色：红色
这是一辆红色的东风卡车，载重10.5吨