阅读以下说明和Java代码，填补代码中的空缺，将解答填入答题纸的对应栏内。【说明】以下Java代码实现两类交通工具(Flight和Train)的简单订票处理，类Vehicle、Flight、Train之间的关系如图5-1所示。
【Java代码】
importjava.util.ArrayList;importjava.util.List;abstractclassVehicle{voidbook(intn){//订n张票if(getTicket0()>=n){decreaseTicket(n);}else{System.out.println(“余票不足！！“)；}}abstractintgetTicket();abstractvoiddecreaseTicket(intn);};classFlight(1){Private(2)tickets=216；//Flight的票数IntgetTicket(){Returntickets；}voiddecreaseTicket(intn){tickets=tickets-n；}}classTrain(3){Private(4)tickets=2016;//Train的票数intgetTicket(){returntickets;}voiddecreaseticket(intn){tickets=tickets-n;}}publicclassTest{publicstaticvoidmain(String[]args){System.out.println(“欢迎订票!")；ArrayListVehiclev=newArrayListVehicle();v.add(newFlight());v.add(newTrain());v.add(newFlight());v.add(newTrain());v.add(newTrain());for(inti=0;iv.size();i++){(5)(i+1);//订i+1张票System.out.println(“剩余票数：”+v.get(i).getTicket())；}}}
运行该程序时输出如下：欢迎订票！剩余票数：215剩余票数：2014剩余票数：(6)剩余票数：(7)剩余票数：(8)
extendsVehicleintextendsVehicleintv.get(i).book21320122011
