请大神求解obj1.way()为什么会报错

public class Vehicles {       //父类

public static void main(String[] args) {

Vehicles obj1 = new Vehicles();

Vehicles obj2 = new Bus();

Vehicles obj3 = new boat();

Vehicles obj4 = new airplane();

obj1.way();   

}

}

public class Bus extends Vehicles {  //子类BUS

int number=50;

String name="bus";

String function="陆地";

  public  void way() {

System.out.println("载客"+number+"人的"+name+"是在"+function+"上运行的");

}

}

public class boat extends Vehicles {  //子类BUS

int number=500;

String name="boat";

String function="海洋";

  public  void way() {

System.out.println("载客"+number+"人的"+name+"是在"+function+"上运行的");

}

}

public class airplane extends Vehicles {    //子类airplane

int number=1000;

String name="airplant";

String function="天空";

void way() {

System.out.println("载客"+number+"人的"+name+"是在"+function+"上运行的");

}

}