abstract class Vehicle {
    public abstract void run();
}

class Car extends Vehicle {
    @Override
    public void run() {
        System.out.println("汽车在公路上行驶 🚗");
    }
}

class Bike extends Vehicle {
    @Override
    public void run() {
        System.out.println("自行车在自行车道骑行 🚲");
    }
}

class Truck extends Vehicle {
    @Override
    public void run() {
        System.out.println("卡车在高速公路行驶 🚛");
    }
}

public class VehicleTest {
    public static void main(String[] args) {
        Vehicle[] vehicles = {new Car(), new Bike(), new Truck()};

        System.out.println("=== 进阶题测试 ===");
        System.out.println("车辆运行情况：");
        for (int i = 0; i < vehicles.length; i++) {
            System.out.print((i + 1) + ". ");
            vehicles[i].run();
        }
    }
}