请各位多指点

• 

• public class Encapsulation {
      //获取List<Car<String,Integer>>类型arrayList对象的方法
      public static List<Car<String,Integer>> getarrayList(){
          return new ArrayList<Car<String,Integer>>();
      }
      //获取List<String>类型 对象的方法
      public static List<String> getArrayList(){
          return new ArrayList<String>();
      }
      //获得 账单列表的方法
      public static void  carBill(List<String> car){
          Iterator<String> it = car.iterator();
          while(it.hasNext()){
              System.out.printf("     "+it.next());
          }
      }
  
      // 获得菜单的方法
     public static void getMenu(List<Car<String,Integer>> car){
      Iterator<Car <String,Integer>> it = car.iterator();
      int serialNumber =1; // 序号
          while(it.hasNext()) {
              System.out.println(serialNumber + "   " + it.next().toSring()+"\n");
              serialNumber++;
          }
      }
  }

• public class Test {
      public static void main(String[] args) {
          Scanner input = new Scanner(System.in);
          //************************************将汽车类封装到arrayList容器中**************************
  
          Car<String, Integer> benz = new Bus<String, Integer>("奔驰", 600, 4);
          Car<String, Integer> bmw = new Bus<String, Integer>("商务", 900, 10);
          Car<String, Integer> dayun = new Truck<String, Integer>("大运", 1200, 30);
          Car<String, Integer> fengtian = new Pickup<String, Integer>("丰田", 700, 4, 4);
          Encapsulation encapsulation = new Encapsulation();
          List<Car<String, Integer>> car = Encapsulation.getarrayList();
          car.add(benz);
          car.add(bmw);
          car.add(dayun);
          car.add(fengtian);
  
  
          //***********************开始界面**************************************
  
          System.out.println("欢迎您光临达达租车系统\n");
          System.out.println("您是否要租车?");
          System.out.println("y/是  n/否");
          while (true) try {
              String answer = input.nextLine();
              if (answer.charAt(0) == 'y') {
                  System.out.println("您可租车的类型及其价目表\n");
                  System.out.println("序号        汽车名称        租金        容量\n");
                  Encapsulation.getMenu(car);
                  System.out.println("请输入您要租车的数量");
                  int totalNumber; //租车的总数量
  
                  //************** 要租车的总数量***************************
                  ok:
                  while (true) {
                      try {
                          totalNumber =Integer.parseInt(input.nextLine().trim());
                          break ok;
                      } catch (NumberFormatException e) {
                          System.out.println("输入不正确,请重新输入");
                      }
                  }
                  List<String> capacityCarName = Encapsulation.getArrayList(); //载客车名称
                  List<String> tonnageCarName = Encapsulation.getArrayList();  //载货车名称
                  int totalCapacity = 0; //总载客量
                  int totalTonnage = 0; //总吨位
                  int totalPrice = 0;   //总价钱
                  int number; // 第i辆车的序号
                  //输入相应车型的序号
                  for (int i = 1; i <= totalNumber; i++) {
                      System.out.println("请输入您要租的第" + i + "辆车的序号");
                      number1:
                      while (true) {
                          try {
                              number = Integer.parseInt(input.nextLine().trim());
                              break number1 ;
                          } catch (NumberFormatException e) {
                              System.out.println("输入错误，重新输入");
                          }
                      }
                      if (number == 1) {
                          capacityCarName.add(benz.getName());
                          Bus car1 = (Bus) benz;
                          totalCapacity += (int)car1.getCapacity();
                          totalPrice += benz.getPrice();
                      }
                      if(number == 2){
                         capacityCarName.add(bmw.getName());
                          Bus car2 = (Bus) bmw;
                          totalCapacity += (int)car2.getCapacity();
                          totalPrice +=bmw.getPrice();
                      }
                      if(number ==3){
                          tonnageCarName.add(dayun.getName());
                          Truck car3 =(Truck) dayun;
                          totalTonnage += (int)car3.getTruck();
                          totalPrice +=dayun.getPrice();
                      }
                      if(number ==4){
                          tonnageCarName.add(fengtian.getName());
                          capacityCarName.add(fengtian.getName());
                          Pickup car4 = (Pickup)fengtian;
                           totalCapacity += (int)car4.getCapacity();
                           totalTonnage += (int)car4.getTonnage();
                      }
                  }
                  System.out.println("请输入租车的天数");
                  int day;
                  nubmer2:
                   while(true){
                       try {
                           day = Integer.parseInt(input.nextLine().trim());
                           break nubmer2;
                       }catch(NumberFormatException e){
                           System.out.println("输入有误，请重新输入");
                       }
                   }
                  System.out.println("您的账单\n");
                  System.out.println("*******可载人的车辆有******************");
                  Encapsulation.carBill(capacityCarName);
                  System.out.println("   "+"共载"+totalCapacity+"人\n");
  
                  System.out.println("*******可载人的车辆有******************");
                  Encapsulation.carBill(tonnageCarName);
                  System.out.println("   "+"共载"+totalTonnage+"吨\n");
                  System.out.println("租车总金额是:"+totalPrice*day);
                  System.out.println("谢谢惠顾");
                  System.exit(1);
              } else if (answer.charAt(0) == 'n') {
                  System.out.println("欢迎您下次光临");
                  System.exit(1);
              } else {
                  System.out.println("输入有误，请重新输入");
              }
          } catch (InputMismatchException e) {
              System.out.println("输入有误，请重新输入");
          } catch (ArrayIndexOutOfBoundsException e) {
              System.out.println("输入有误，请重新输入");
          }
      }
  }