java/w5/jinjie/Vehicle.java

package w5.jinjie;

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("自行车在非机动车道行驶");
    }
}

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