How to refresh a JTable model after insert delete or update the data

0 votes

I have the following JTable code:

private JTable fetchJTable() {
    String[] col = { "Name", "Email", "Contact No. 1", "Contact No. 2",
            "Group", "" };
    if (jTable == null) {
        jTable = new JTable() {
            public boolean isCellEditable(int nRow, int nCol) {
                return false;
    DefaultTableModel contactTableModel = (DefaultTableModel) jTable
    return jTable;

I will call the  fetchJTable() method to retrieve the data from the database and insert it into a 

public void setUpTableData() {
    DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
    ArrayList<Contact> list = new ArrayList<Contact>();
    if (!con.equals(""))
        list = sql.getContactListsByGroup(con);
        list = sql.getContactLists();
    for (int i = 0; i < list.size(); i++) {
        String[] data = new String[7];

            data[0] = list.get(i).getName();
            data[1] = list.get(i).getEmail();
            data[2] = list.get(i).getPhone1();
            data[3] = list.get(i).getPhone2();
            data[4] = list.get(i).getGroup();
            data[5] = list.get(i).getId();


With this code, I was using the fetchJTable() method to refresh the table once the data has been inserted and updated. But before refreshing the data, I am trying to clear the table before restructuring the table model:

DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel(); tableModel.setRowCount(0);

Is this the correct way or are there any other standard ways?

Oct 11, 2018 in Java by 93.lynn
• 1,610 points

1 answer to this question.

0 votes

In my opinion, you can notify your JTable about the data change by simply using tableModel.fireTableDataChanged().

For more details, you can refer the documentation:

Notifies all listeners that all cell values in the table's rows may have changed. The number of rows may also have changed and the JTable should redraw the table from scratch. The structure of the table (as in the order of the columns) is assumed to be the same.

answered Oct 11, 2018 by code.reaper12
• 3,500 points
This comment is worthless.
hahahahaha xD

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