关于类的继承的习题。麻烦帮忙看一下应该怎么作。谢谢[

 class vehicle {
    //共性，长宽高重，轮数，载员数，类型，主人
    float height;
    float width;
    float length;
    float weight;//车重
    float load;//载重
    int person;//载员数
    int wheel;//轮数
    int type;//类型
    String owner;//主人
    //行为
    move(){}
    moveBack(){}
    turn(direct){}
}

 enum taxi_status{//未可用，空闲，运营，占用，报废
     taxi_unused,
     taxi_free,
     taxi_running,
     taxi_ocupied,
     taxi_scrapped

 }

 class taxi extends vehicle{
//性质
     String company;//所属公司
     String curLocation;//目前地址
     String startLocat;//始发地
     String dest;//目的地
     taxi_status status;//状态，
     Integer distance;//计价路程 ，米
     Integer time_span;//计价时长，分钟
     Integer start_distance;//起始计费距离
     Integer start_time_span;//起始计费时长
     double price1;//每公里价格
     double price2;//每分钟价格
     double payment;
//getters and setters
     taxi(){
         start_distance = 5;
         start_time_span = 60;
         price1 = 1.1;
         price2 = 0.1;
     }

 //行为
     void loadingPassenger() {//载客，或载客途中
         status = taxi_status.taxi_ocupied;
     }
     void load() {//开始运客
         status = taxi_status.taxi_running;
         distance = 0;         time_span = 0;
         //setstartlocation, setDest()
     }
     void unload() {//下客
         status = taxi_status.taxi_free;
        //setstartlocation, setDest()
         
     }
     void tick() {
         //totaltime++; 统计工作时长
        if(status == taxi_status.taxi_running) time_span++;//分钟 计算运客时长
     }
     void moveOn() {//每前进一米执行一次
         distance++;
     }
     double getPayment() {//计算当前费用
         return price1 * ((distance - start_distance) > 0 ? (distance - start_distance) : 0) / 1000
                 + price2 * ((time_span - start_time_span) > 0 ? (time_span - start_time_span) : 0)
                 + price1 * start_distance ;
     }
     void moveAround(String curLocate) {//时刻记录当前位置, 参数可以是经纬度，或是街道及距离等复杂对象
         this.curLocation = curLocate;
     }

 }