代码在一段时间前工作，然后"java.util.InputMismatchException"

Question

别紧张，我自学成才，对这一切都很陌生。所以我试着写一本通讯录。一切都很好，没有错误，没有例外。保存了项目，换了笔记本电脑，去吃午饭了。回来后，尝试运行代码，收到一个错误。

根据例外情况，我知道这与我的扫描仪有关。异常突出显示

int phone = inFile.nextInt()  

作为问题。但我不知道它出了什么问题。

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at test.AddressBook.main(AddressBook.java:255)

代码

public class AddressBook 
{
static Scanner inFile;
static FileWriter outFile;
static ArrayList<extPerson> person;
static extPerson record;
static File fileName = new File("AddressBook.txt");
private boolean b;

这是Main的代码。

public static void main(String[]args) throws IOException
{   
    int option = 0;
    int n = 0;
    AddressBook ab = new AddressBook();

    inFile = new Scanner(new FileReader(fileName)).useDelimiter("[|\n]");
    //System.out.println(inFile.delimiter());
    //int count = 0;
    while(inFile.hasNext())
    {
        String fName = inFile.next();
        //System.out.print(fName);
        String mName = inFile.next();
        //System.out.print(mName);
        String lName = inFile.next();
        //System.out.print(lName);
        int phone = inFile.nextInt();
        //System.out.println(phone);
        String relationship = inFile.next();
        //System.out.print(relationship);
        int day = inFile.nextInt();
        //System.out.print(day);
        int month  = inFile.nextInt();
        //System.out.print(month);
        int year  = inFile.nextInt();
        //System.out.print(year);
        String street = inFile.next();
        //System.out.print(street);
        String city = inFile.next();
        //System.out.print(city);
        String state = inFile.next();
        //System.out.print(state);
        String zipCode = inFile.next();
        //System.out.println(zipCode);
        record = new extPerson(fName, mName, lName, phone, relationship, 
                day, month, year, street, city, state, zipCode);
        person.add(record);
    }

    while (true)
    {
        String input = JOptionPane.showInputDialog(
                            "Please Enter a number indicating your choice of action:"
                            + "nEnter 1 To Add Record"
                            + "nEnter 2 To Search Record By Last Name"
                            + "nEnter 3 To Delete Record"
                            + "nEnter 4 To Modify Record"
                            + "nEnter 5 To Display All Records"
                            + "nEnter 6 To Exit");
        if((input != null)&&(input.isEmpty() != true))
        {
            option = Integer.parseInt(input);
             if((option > 0 ) && (option < 7))
            {
                switch (option) {
                case 1:
                   ab.addRecord();
                   break;
                case 2:
                   ab.searchRecord();
                   break;
                case 3:
                   ab.deleteRecord();
                   break;
                case 4:
                    ab.modifyRecord();
                    break;
                case 5:
                    ab.allRecord();
                    break;
                case 6:
                    System.exit(0);
                }
            }
            else if(option == JOptionPane.CLOSED_OPTION)
            {
                n = JOptionPane.showConfirmDialog(null, "Are you sure you want to close?");
                if(n == JOptionPane.YES_OPTION)
                    System.exit(0);
            }
        }
        else if (input == null)
        {
            n = JOptionPane.showConfirmDialog(null, "Are you sure you want to close?",
                    "Confirm",
                    JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE);
            if(n == JOptionPane.YES_OPTION)
                System.exit(0);
        }
        else 
        {
            System.out.println("Invalid option. Please try again.");
        }

    }
}

我只需要有人给我指明正确的方向，并可能向我解释是什么导致了这种异常。如有任何帮助，我们将不胜感激。如果你需要更多的代码来分析这个问题，请告诉我，我会把它发布出来。再次感谢。

编辑样本数据

Jeremy|Ronald|Wright|4331732|Family Member|06|04|2013|Eastlawn|Orange Cove|Texas|06666-9139
Heather|Paula|Perkins|7285248|Friends|04|06|2013|Bashford|Yuba City|New Mexico|99585-6820
Edward|Stephen|Allen|7186971|Family Member|25|06|2013|Reinke|Downey|Arizona|15915-9508
Dorothy|Philip|Robinson|8932173|Business Associate|15|07|2013|Harper|La Verne|Montana|37275-3957
Joan|Harry|Wilson|3859088|Business Associate|01|02|2014|Eastlawn|Antioch|Maryland|85923

Answer 1

逐行拆分和解析将有助于避免此类问题。

    while (inFile.hasNext()) {
        String line = inFile.nextLine();
        String[] tokens = line.split("\|");
        String fName = tokens[0];
        String mName = tokens[1];
        String lName = tokens[2];
        int phone = Integer.parseInt(tokens[3]);
        String relationship = tokens[4];
        int day = Integer.parseInt(tokens[5]);
        int month = Integer.parseInt(tokens[6]);
        int year = Integer.parseInt(tokens[7]);
        String street = tokens[8];
        String city = tokens[9];
        String state = tokens[10];
        String zipCode = tokens[11];
    }

用你的文本文件片段做这件事对我来说很好。

Answer 2

在Java中，一些分隔符拆分器使用空/空标记，而另一些则不使用。如果您有||或|notInt|，并且恰好运行了scanner.nextInt()，则会得到ImputMismatchException

Scanner i =
        new Scanner("Jeremy|Ronald|Wright|43|||Family Member|06|04|2013|06666-9139n").useDelimiter("[|\n]");
    while (i.hasNext()) {
        for (int j = 0; j < 3; j++) {
            System.out.println(i.next());
        }
        for (int j = 3; j < 6; j++) {
            int loc = i.nextInt();   // here i get same exception  
                                     // when reading next int after 43
            System.out.println(loc);
        }
    }

带有分隔符和字符串拆分器的扫描器处理空令牌，而StringTokenizer不处理，运行以下代码

    System.out.println("------Scanner Delimiter------------------------------");
    Scanner i =
        new Scanner("Jeremy|Ronald|433|||06|04|2013|06666-9139").useDelimiter("[|]");
    while (i.hasNext()) {           
            System.out.println("""+i.next()+""");         
    }
    System.out.println("---------------String split---------------------");
     String[] result = "Jeremy|Ronald|433|||06|04|2013|06666-9139".split("[|]");
     for(String s: result)
         System.out.println("""+s+""");
    System.out.println("-------------String Tokenizer-----------------------");
     StringTokenizer st = new StringTokenizer("Jeremy|Ronald|433|||06|04|2013|06666-9139", "|");
     while (st.hasMoreTokens()) {
         System.out.println("""+st.nextToken()+""");
     }

将输出：

------Scanner Delimiter------------------------------ "Jeremy" "Ronald" "433" "" "" "06" "04" "2013" "06666-9139" ---------------String split--------------------- "Jeremy" "Ronald" "433" "" "" "06" "04" "2013" "06666-9139" -------------String Tokenizer----------------------- "Jeremy" "Ronald" "433" "06" "04" "2013" "06666-9139"