Java DefaultTableModel

Question

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

    DefaultTableModel Samplemodel = (DefaultTableModel) jTable1.getModel();
    Samplemodel.setRowCount(0);


    FileInputStream excelFIS = null;
    BufferedInputStream excelBIS = null;
    XSSFWorkbook excelImportWorkBook = null;

    String defaultCurrentDirectoryPath = "D:\\Downloads";
    JFileChooser excelFileChooser = new JFileChooser(defaultCurrentDirectoryPath);
    excelFileChooser.setDialogTitle("Select Excel File");
    FileNameExtensionFilter dist = new FileNameExtensionFilter("EXCEL FILES", "xls", "xlsx", "xlsm");
    excelFileChooser.setFileFilter(dist);
    int excelChooser = excelFileChooser.showOpenDialog(null);
    if (excelChooser == JFileChooser.APPROVE_OPTION) {
        try {
            File excelFile = excelFileChooser.getSelectedFile();
            excelFIS = new FileInputStream(excelFile);
            excelBIS = new BufferedInputStream(excelFIS);
            excelImportWorkBook = new XSSFWorkbook(excelBIS);
            XSSFSheet excelSheet = excelImportWorkBook.getSheetAt(0);

            for (int i = 0; i < excelSheet.getLastRowNum(); i++) {
                XSSFRow excelRow = excelSheet.getRow(i);

                XSSFCell excelStudentID = excelRow.getCell(0);
                XSSFCell excelStudentName = excelRow.getCell(1);
                XSSFCell excelCourse = excelRow.getCell(2);
                XSSFCell excelYearLevel = excelRow.getCell(3);
                XSSFCell excelContactNumber = excelRow.getCell(4);
                XSSFCell excelBalance = excelRow.getCell(5);


                Samplemodel.addRow(new Object[] {
                    excelStudentID,
                    excelStudentName,
                    excelCourse,
                    excelYearLevel,
                    excelContactNumber,
                    excelBalance
                });



            }
            JOptionPane.showMessageDialog(null, "Your Excel File is successfully Imported");

        } catch (IOException ex) {
            Logger.getLogger(Sample.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

}

错误是：

线程"AWT-EventQueue-0“中的

异常java.lang.ClassCastException:无法将类javax.swing.table.DefaultTableModel转换为类示例$DefaultTableModel (javax.swing.table.DefaultTableModel位于加载程序‘引导’的模块java.desktop中；示例$DefaultTableModel位于加载程序‘app’的未命名模块中)

Answer 1

它将在类DefaultTableModel中声明一个类(或接口) Sample，并且您必须导入该类而不是javax.swing.table.DefaultTableModel。