java - 如何使用 jbutton 清除 jtable 中的数据

Question

我有一个代表大量数据的表格。这是创建该表的代码

DefaultTableModel model = (DefaultTableModel) Main_Menu.jTable3.getModel(); //Main menu is my form



            List<ReportCalculateSimiliarity> theListRCS = new ArrayList<ReportCalculateSimiliarity>();
            ReportCalculateSimiliarity rcs = new ReportCalculateSimiliarity();

            rcs.setNameOfMainFile(name);
            rcs.setNameOfComparingFile(enemy);
            rcs.setLevenstheins(resultOfLevenstheins);
            rcs.setSmithWaterman(resultOfSmithWaterman);

            theListRCS.add(rcs);


            for (ReportCalculateSimiliarity reportCalculateSimiliarity : theListRCS) {

                model.addRow(new Object[]{
                    reportCalculateSimiliarity.getMainFile(),
                    reportCalculateSimiliarity.getComparingFile(),
                    reportCalculateSimiliarity.getLevenstheins(),
                    reportCalculateSimiliarity.getSmithWaterman(),

                });
            }

然后，我有一个 jbutton 来重置该数据。代码是这样的:

private void btnCancelActionPerformed(java.awt.event.ActionEvent evt) {                                          
    int confirm = JOptionPane.showConfirmDialog(null, "clear ?", "end session", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
    if (confirm == JOptionPane.YES_OPTION) {
        //this is to clear that jtable
    }
} 

我必须这样做，因为我的 jTable 已连接到 jfreechart。如果 jtable 中的数据不清楚，jfreechart 就会出错，因为以前的数据仍然存在并在我的条形图中形成一个条形图。条形图代码如下:

public final CategoryDataset createDataset() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    dataset.clear();

    String algoritma1 = "Levensthein";
    String algoritma2 = "SmithWaterman";

    for (int i = 0; i < Main_Menu.jTable3.getRowCount(); i++) {

        Object fileName = Main_Menu.jTable3.getValueAt(i, 1);
        String fileNameToString = fileName.toString();

        Object nilaiLevensthein = Main_Menu.jTable3.getValueAt(i, 2); // Ambil Nilai Persentase Levensthein
        double count1 = Double.parseDouble(nilaiLevensthein.toString());

        Object nilaiSmithWaterman = Main_Menu.jTable3.getValueAt(i, 3);
        double count2 = Double.parseDouble(nilaiSmithWaterman.toString());

        dataset.addValue(count1, algorithm1, fileNameToString);
        dataset.addValue(count2, algorithm2, fileNameToString);

    }

对于帮助，非常感谢...

Answer 1

正如评论所说，DefaultTableModel#setRowCount是要走的路。

  private void btnCancelActionPerformed(java.awt.event.ActionEvent evt) {                                          
    int confirm = JOptionPane.showConfirmDialog(null, "clear ?", "end session", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
    if (confirm == JOptionPane.YES_OPTION) {
        ((DefaultTableModel) Main_Menu.jTable3.getModel()).setRowCount(0);
    }
}