By user236501


2010-07-05 11:34:23 8 Comments

This is my jTable

private JTable getJTable() {
    String[] colName = { "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
            .getModel();
    contactTableModel.setColumnIdentifiers(colName);
    jTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    return jTable;
}

I will call this method to retrieve the data from database and put it into table model

public void setUpTableData() {
    DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
    ArrayList<Contact> list = new ArrayList<Contact>();
    if (!con.equals(""))
        list = sql.getContactListsByGroup(con);
    else
        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();

        tableModel.addRow(data);
    }
    jTable.setModel(tableModel);
}

Currently I was using this method to refresh the table after updating the table data. I will first clear the table

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

and then restructure the table model again so it will refresh the jTable. But I was thinking is there any best practices or better way to do that?

6 comments

@Peter Lang 2010-07-05 11:54:18

If you want to notify your JTable about changes of your data, use
tableModel.fireTableDataChanged()

From 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.

@user236501 2010-07-05 11:57:16

do you mean i call this tableModel.fireTableDataChanged() everytime when i doing updating ?

@Peter Lang 2010-07-05 11:59:39

@newbie123: If you only insert new lines, you can use fireTableRowsInserted instead. On the other hand, the implementation of DefaultTableModel.addRow should already handle that... Isn't your table refreshed by addRow?

@Peter Lang 2010-07-05 12:40:51

Use setValueAt, DefaultTableModel fires the event.

@Milan Aleksić 2012-02-17 10:47:15

One should notice though that the call must be made on casted javax.swing.table.AbstractTableModel, since interface TableModel does not have the method mentioned above

@Sajad 2013-08-18 21:51:36

@PeterLang see my question please: stackoverflow.com/questions/18282753/…

@Achille 2013-05-31 09:34:52

try this

public void setUpTableData() {
    DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();

    /**
    * additional code.
    **/
    tableModel.setRowCount(0);
    /**/
    ArrayList<Contact> list = new ArrayList<Contact>();
    if (!con.equals(""))
        list = sql.getContactListsByGroup(con);
    else
        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();

        tableModel.addRow(data);
    }
    jTable.setModel(tableModel);
    /**
    * additional code.
    **/
    tableModel.fireTableDataChanged();
    /**/
}

@David George 2014-05-13 08:18:35

You don't need the jTable.setModel(tableModel) at the end as you already got the Table's model at the start.

@Sumit Singh 2012-08-21 07:29:27

DefaultTableModel dm = (DefaultTableModel)table.getModel();
dm.fireTableDataChanged(); // notifies the JTable that the model has changed

@mKorbel 2012-08-21 10:50:15

no, not... DefaultTableModel has implemented this event, and implemented correctly ...

@tom 2011-10-16 09:38:54

Would it not be better to use java.util.Observable and java.util.Observer that will cause the table to update?

@mKorbel 2011-10-16 12:10:55

not, sure not, don't do that, why simulated JTable's built-in option and out from EDT

@Daniel De León 2012-02-03 21:24:22

The faster way for your case is:

    jTable.repaint(); // Repaint all the component (all Cells).

The optimized way when one or few cell change:

    ((AbstractTableModel) jTable.getModel()).fireTableCellUpdated(x, 0); // Repaint one cell.

@Kevin Qiu 2013-06-06 18:36:39

I actually found that jTable.invalidate() was the method that actually forced a redraw.

@Daniel De León 2013-06-07 01:23:26

Right, but the validate method is part of the layout process, and impacts the parents of the container too. So if you need the redo the layout, use it. docs.oracle.com/javase/7/docs/api/java/awt/…

@nkvnkv 2011-05-21 15:44:26

I did it like this in my Jtable its autorefreshing after 300 ms;

DefaultTableModel tableModel = new DefaultTableModel(){
public boolean isCellEditable(int nRow, int nCol) {
                return false;
            }
};
JTable table = new JTable();

Timer t = new Timer(300, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                addColumns();
                remakeData(set);
                table.setModel(model);
            }
        });
        t.start();

private void addColumns() {
        model.setColumnCount(0);
        model.addColumn("NAME");
            model.addColumn("EMAIL");} 

 private void remakeData(CollectionType< Objects > name) {
    model.setRowCount(0);
    for (CollectionType Objects : name){
    String n = Object.getName();
    String e = Object.getEmail();
    model.insertRow(model.getRowCount(),new Object[] { n,e });
    }}

I doubt it will do good with large number of objects like over 500, only other way is to implement TableModelListener in your class, but i did not understand how to use it well. look at http://download.oracle.com/javase/tutorial/uiswing/components/table.html#modelchange

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