我的答案是不同步的，不能为下次运行N. [英] My answer is not in sync and cannot run N for next

问题描述

您好，有人可以帮我解决这些问题。有2个问题。



对于乘客身份，我写了0然后BI是国家代码，095是航班号。 01是没有。行李



然后我跑完后会说：

bi0950

[0行李（s） ）[bi0950]]



1）问题：如果我再次输入B并输入下一位乘客为1的详细信息，则BI为国家代码，095为航班号。 02是没有。行李。



我跑完后会说：

Hello, can somebody help me with the code. Have 2 questions.

For the passenger identity, i wrote 0 then BI is the country code, 095 is the flight no. 01 is the no. of baggage

then after I run, it will says:
bi0950
[0 with baggage(s) [bi0950]]

1) Questions: If I enter B again and enter the detail with the next passenger of 1, BI is the country code, 095 is the flight no. 02 is the no. of baggage.

after I run, it will says:

bi0950
bi0951
[0 with baggage(s) [bi0950, bi0950, bi0951], 1 with baggage(s) [bi0950, bi0950, bi0951]]

如你所见，它乘客不同步0假设有1个行李箱是bi0950，乘客1应该是bi0951，bi0952但毕竟乘客0也受影响。



问题2：

，下一行将是：输入命令B-baggage，n-next，q-quit



我输入n并运行，错误弹出如下：

As you can see, it is not sync like passenger 0 suppose to be have 1 luggage which is bi0950, passenger 1 should be bi0951,bi0952 but after all, passenger 0 is also affected.

Question 2:
and the next line will be: Enter command B-baggage, n-next, q-quit

I put in "n" and run, and the error pops out as follows:

java.util.NoSuchElementException
at java.util.LinkedList$ListItr.next(Unknown Source)
at baggageSys.next(baggageSys.java:43)
at baggageSys.main(baggageSys.java:97)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)

这里有什么要解决的..？谢谢



我尝试过：

anything to fix here..? thanks

What I have tried:

import java.util.*;

public class baggageSys{
  
  public static String getUser_command(){
    Scanner keyboard = new Scanner(System.in);
    System.out.print("Enter command B-baggage, n-next, q-quit");
    String s = keyboard.nextLine();
    return s;
  }

  public static String getUser_flight(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter the flight number");
     String s = keyboard.nextLine();
     return s;
  }

  public static String getPassenger(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter passenger name");
     String s = keyboard.nextLine();
     return s;
  }

   public static String getUser_country(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter the country code");
     String s = keyboard.nextLine();
     return s;
  }

   public static int getUser_number(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter number of baggage");
     int s = keyboard.nextInt();
     return s;
  }


   public static String next(ListIterator<passenger> passenger){
     String k = "";
     passenger.next();
     return k;


   }

   public static String makeBaggage(String country, String flight, int num){
     return country + flight + num;
   }

  public static void main(String args[]) {

    LinkedList<passenger> passenger = new LinkedList<passenger>();
    ListIterator<passenger> iterator = passenger.listIterator();
    LinkedList<string> baggage = new LinkedList<string>();

    String command = "";

    while (!command.equals("q")){
      command = getUser_command();

     if(command.equals("B") || command.equals("b")){
       String p = "";
       p = getPassenger();
       passenger.add(new Passenger(p));

      // command = getUser_command();

       String country = "";
       country = getUser_country();


       String flight = "";
       flight = getUser_flight();


       int amount = 0;
       amount = getUser_number();


       String[] bg = new String[amount];

       for(int i = 0; i < amount; i++){
         bg[i] = makeBaggage(country, flight, i);
         baggage.add(bg[i]);
         System.out.println(bg[i]);

       passenger.getLast().setBaggages(baggage);
       }

       System.out.println(passenger);


     } else if(command.equals("n")){
       next(iterator);

     }else
       System.out.println("Enter 'q' to end the program");

     }
    
  }
  
public static class Passenger {

    String passengers;
    List<string> baggage;  

    public Passenger(String passengers) {
        this.passengers = passengers;
        baggage = Collections.emptyList();
    }

    public void setBaggages(List<string> baggage) {
        this.baggage = baggage;
    }

    @Override
    public String toString() {
        return passengers + " with baggage(s) " + baggage;
    }
}
}

推荐答案

ListItr.next（未知来源）
at baggageSys.next（baggageSys.java:43）
at baggageSys.main（baggageSys.java:97）
at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）
at sun.reflect .NativeMethodAccessorImpl.invoke（未知来源）
at sun.reflect.DelegatingMethodAccessorImpl.invoke（Unknown Source）
at java.lang.reflect.Method.invoke（Unknown Source）
at edu.rice .cs.drjava.model.compiler.JavacCompiler.runCommand（JavacCompiler.java:272）

ListItr.next(Unknown Source) at baggageSys.next(baggageSys.java:43) at baggageSys.main(baggageSys.java:97) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)

这里要解决的问题..？谢谢



我尝试过：

anything to fix here..? thanks

What I have tried:

import java.util.*;

public class baggageSys{
  
  public static String getUser_command(){
    Scanner keyboard = new Scanner(System.in);
    System.out.print("Enter command B-baggage, n-next, q-quit");
    String s = keyboard.nextLine();
    return s;
  }

  public static String getUser_flight(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter the flight number");
     String s = keyboard.nextLine();
     return s;
  }

  public static String getPassenger(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter passenger name");
     String s = keyboard.nextLine();
     return s;
  }

   public static String getUser_country(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter the country code");
     String s = keyboard.nextLine();
     return s;
  }

   public static int getUser_number(){
     Scanner keyboard = new Scanner(System.in);
     System.out.println("Please enter number of baggage");
     int s = keyboard.nextInt();
     return s;
  }


   public static String next(ListIterator<passenger> passenger){
     String k = "";
     passenger.next();
     return k;


   }

   public static String makeBaggage(String country, String flight, int num){
     return country + flight + num;
   }

  public static void main(String args[]) {

    LinkedList<passenger> passenger = new LinkedList<passenger>();
    ListIterator<passenger> iterator = passenger.listIterator();
    LinkedList<string> baggage = new LinkedList<string>();

    String command = "";

    while (!command.equals("q")){
      command = getUser_command();

     if(command.equals("B") || command.equals("b")){
       String p = "";
       p = getPassenger();
       passenger.add(new Passenger(p));

      // command = getUser_command();

       String country = "";
       country = getUser_country();


       String flight = "";
       flight = getUser_flight();


       int amount = 0;
       amount = getUser_number();


       String[] bg = new String[amount];

       for(int i = 0; i < amount; i++){
         bg[i] = makeBaggage(country, flight, i);
         baggage.add(bg[i]);
         System.out.println(bg[i]);

       passenger.getLast().setBaggages(baggage);
       }

       System.out.println(passenger);


     } else if(command.equals("n")){
       next(iterator);

     }else
       System.out.println("Enter 'q' to end the program");

     }
    
  }
  
public static class Passenger {

    String passengers;
    List<string> baggage;  

    public Passenger(String passengers) {
        this.passengers = passengers;
        baggage = Collections.emptyList();
    }

    public void setBaggages(List<string> baggage) {
        this.baggage = baggage;
    }

    @Override
    public String toString() {
        return passengers + " with baggage(s) " + baggage;
    }
}
}

我无法弄清楚问题1，我担心代码不容易了解。第二个问题仅仅是你没有初始化 ListIterator 。即使你有，它似乎没有任何目的。我建议你去 Java™教程 [ ^ ]并进行更多研究。

I cannot figure out problem 1, I'm afraid the code is not easy to understand. The second problem is merely that you have not initialise the ListIterator. And even if you had, it does not seem to serve any purpose. I would suggest going to The Java™ Tutorials[^] and doing some more study.

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