若vehicle=[['train','car'],['bus','subway'],['ship','bicycle'],['car']],则len(vehicle[1])结果是什么?
A.2
B.7
C.6
D.4
A.2
B.7
C.6
D.4
第2题
A.1
B.7
C.6
D.4
第3题
A.3
B.7
C.6
D.4
第5题
A.car
B.7
C.1
D.2
第6题
A.7
B.6
C.4
D.2
第7题
A.shuffle
B.unusual train
C.commute
D.shuttle
第8题
A、vehicle
B、truck
C、train
D、trunk
第9题
【Java代码】 import java.util.ArrayList; import java.util.List; abstract class Vehicle { void book(int n) { //订 n张票 if (getTicket0()>=n) { decrease Ticket(n); } else { System.out.println(“余票不足!!“); } } abstract int getTicket(); abstract void decreaseTicket(int n); }; class Flight (1) { Private (2) tickets=216; //Flight的票数 Int getTicket(){ Return tickets; } void decreaseTicket(int n){ tickets=tickets -n; } } class Train (3) { Private (4) tickets=2016; //Train的票数 int getTicket() { return tickets; } void decreaseticket(int n) { tickets = tickets - n; } } public class Test { public static void main(String[] args) { System.out.println(“欢迎订票 ! "); ArrayList<Vehicle> v = new ArrayList<Vehicle>(); v.add(new Flight()); v.add(new Train()); v.add(new Flight()); v.add(new Train()); v.add(new Train()); for (int i=0;i<v.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)
第10题
若已定义了类Vehicle,则下列派生类定义中,错误的是
A.class Car:Vehicle{/*类体略*/);
B.class Car:public Car{/*类体略*/);
C.class Car:public Vehicle{/*类体略*/);
D.class Car:virtual public Vehicle{/*类体略*/);
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