作业是这样吗

package com.imooc;

public class vehicle {

 String vehicles;

 String  way;

 int number;

 public vehicle(String vehicles,String way,int number) {

this.vehicles=vehicles;

this.way=way;

this.number=number;

System.out.println(vehicles+"可以在"+way+"运输"+number+"人");

 }

}

package com.imooc;

public class bus extends vehicle {

public bus(String vehicles, String way, int number) {

super(vehicles, way, number);

// TODO Auto-generated constructor stub

}

}

package com.imooc;

public class boat extends vehicle {

public boat(String vehicles, String way, int number) {

super(vehicles, way, number);

// TODO Auto-generated constructor stub

}

}

package com.imooc;

public class Plane extends vehicle {

public Plane(String vehicles, String way, int number) {

super(vehicles, way, number);

// TODO Auto-generated constructor stub

}

}

package com.imooc;

public class fangfa {

public static void main(String[] args) {

vehicle i=new bus("汽车", "陆地", 40);

vehicle p=new boat("轮船", "海洋", 300);

vehicle l=new Plane("飞机", "空中", 100);

}

}

是这样吗