Question

 public static void readStaffsFromFile() {
    String inFileName = "startup.txt";
    int numStaff, staffID;
    String name, address;
    Staff newStaff;
    boolean fileExists;
    Scanner inFile = null;
    File databaseFile = new File(inFileName);

    fileExists = databaseFile.exists();

    if (fileExists) {
        try {
            inFile = new Scanner(databaseFile);
        } catch (FileNotFoundException fnfe) {
            JOptionPane.showMessageDialog(null, "The file startup.txt has just now been deleted.");
            return; // cannot do anything more.
        }

        numStaff = inFile.nextInt();
        inFile.nextLine();

        for (int i = 0; i < numStaff; i++) {
            staffID = inFile.nextInt();
            name = inFile.nextLine();
            address = inFile.nextLine();

            // try{
            newStaff = new Staff(staffID, name, address);
            addStaff(newStaff);
            // } catch (StaffException se)
            // {
            // System.out.println("Unable to add staff: " + name +
            // " to the system.");
            // }

        }

    }
    JOptionPane.showMessageDialog(null, "System has been set up with default data from startup.txt.");
}

我有这个方法,当我试图从主调调调用这个方法时, 它给了我这个错误。

除“main” java. util. InputMiscess Exception 外, 内插外, 外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外外

at java.util.Scanner.throwFor(Scanner.java:909)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextInt(Scanner.java:2160)
at java.util.Scanner.nextInt(Scanner.java:2119)
at SystemStartUp.readStaffsFromFile(SystemStartUp.java:195)
at SystemStartUp.loadFromFile(SystemStartUp.java:160)
at StartUp.main(StartUp.java:9)

错误行指我的错误从“ staffID = inFile.nextInt (); 的行开始。

输入文件看起来是这样的。

13

11111111

Chris Ling

999 Dandenong Road

22222222

Des Casey

100 Silly Drive

33333333

Maria Indrawan

90 Programming Road

44444444

Campbell Wilson

2/5 Database Street

55555555

Janet Fraser

21 Web Drive

66666666

Judy Sheard

34 Hos Road

77777777

Ngoc Minh

24 Message Street

88888888

Martin Atchinson

45 Martine Street

99999999

Aleisha Matthews

1/6 Admin Road

10101010

Denyse Cove

100 Reception Street

12121212

Cornelia Liou

232 Reception Road

23232323

Trudi Robinson

111 Manager Street

34343434

Henry Linger

2/4 HDR Street

Answer 1

可能 staffID 并不总是包含数字。请检查输入文件。

在 staffID 之后,您必须添加 inFile.nextLine (); 才能在有编号的行之后使用新行字符。否则, 您会在第二个循环中获取错误。

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