这段代码还有哪些地方有待改进

package jicheng;

public class jiaotong {

String name;

int num;

String way;

public void showDate(){

System.out.println(name+"在"+way+"上能载客"+num+"人");

}

}

父类

package jicheng;

public class car extends jiaotong {

public car(String newName,String newWay,int newNum){

super.name=newName;

super.way=newWay;

super.num=newNum;

}

}

汽车子类

package jicheng;

public class plane extends jiaotong {

public plane(String newName,String newWay,int newNum){

super.name=newName;

super.way=newWay;

super.num=newNum;

}

}

飞机子类

package jicheng;

public class ship extends jiaotong {

public ship(String newName,String newWay,int newNum){

super.name=newName;

super.way=newWay;

super.num=newNum;

}

}

轮船子类

package jicheng;

public class initial {

public static void main(String[] args) {

// TODO Auto-generated method stub

jiaotong car=new car("汽车","陆地",4);

jiaotong plane=new plane("飞机","空中",30);

jiaotong ship=new ship("轮船","海上",50);

car.showDate();

plane.showDate();

ship.showDate();

}

}

测试类