Question

我正在将大约79列的文件导入Java，并尝试将这些行读取到数组中。然后，我提取char进行后处理。但是，当我使用索引大于41的.charAt()或.substring()时，会引发错误。我还使用.length()检查行的长度，它显示79索引明显在范围内。

此处的代码：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:

    JFileChooser myFileChooser = new JFileChooser();
    if (myFileChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
        jTextField1.setText(myFileChooser.getSelectedFile().getPath());
    }
    FileReader file = null;
    try {
        file = new FileReader(myFileChooser.getSelectedFile().getPath());
    } catch (FileNotFoundException ex) {
        Logger.getLogger(GPS.class.getName()).log(Level.SEVERE, null, ex);
    }
    BufferedReader myInput = new BufferedReader(file);
    String[] textdata = new String[4000];
    int i = 0;
    do {
        try {
            textdata[i] = myInput.readLine();
        } catch (IOException ex) {
            Logger.getLogger(GPS.class.getName()).log(Level.SEVERE, null, ex);
        }
        if (textdata[i].length() > 0) {
            System.out.println(textdata[i].length()-1);
            headerLabel = String.valueOf(textdata[i].charAt(60));
            switch (headerLabel) {
                case "R":
                    fileType = String.valueOf(textdata[i].charAt(20));
                    if (!"N".equals(fileType)) {
                        jLabel28.setText("File incorrectly imported");
                        break;
                    }
                    version = textdata[i].substring(5, 9);
                    jLabel26.setText(version);
                    mode = String.valueOf(textdata[i].charAt(40));

        }
        i++;
    } while (textdata[i - 1] != null);
}

错误发生在headerLabel = String.valueOf(textdata[i].charAt(60));，抛出：Exception in thread "AWT-EventQueue-0" java.lang.StringIndexOutOfBoundsException: String index out of range: 60

该如何解决问题？

Java：即使索引在范围内，也会出现“字符串索引超出范围”错误

0 个答案: