To add new row with the checkbox selected ....

Question

Hi All,
In my project I have to create a table with 2 columns, 1 column is checkbox and other column is String type. In the same JFrame one textarea and one add button should be there. When we type text in the textarea and click add button, it should add a new row in the table with the checkbox selected and the 2nd column containing the text.
I want to use AbstractTableModel.
Please help me to solve this issue. If you have sample code that will be more helpful.
Thank you,
Regards,
mkumar

Answer 1

It would be better if you extend from DefaultTableModel rather than from Abstract Table Model. That is because DefaultTableModel provides functionality to add a row. In fact, you can directly use DefaultTableModel .
In the button's action performed,
public void actionPerformed(ActionEvent e)
  if(e.getSource() == bAdd)
    Vector newRow = new Vector(2);
    newRow.add(new Boolean(Boolean.TRUE));
    newRow.add(" ");
    DefaultTableModel dm = (DefaultTableModel)yourTable.getModel();
    dm.addRow(newRow);
}Note : For the above code, Initialize the JTable with a DefaultTableModel parameter than directly with Vectors/ Arrays.
This is because when we try to cast from TableModel to DefaultTableModel as in the above code, there is a possibility of an
Exception if the Table is not initialized without a model.
For the CheckBox in the first column, you need to set an editor and a renderer so that you can manipulate and see your boolean values as the state of the check boxes.
  JCheckBox b = new JCheckBox();
  DefaultTableCellRenderer dr = new DefaultTableCellRenderer(b);
  DefaultTableCellEditor de = new DefaultTableCellEditor(b);
  yourTable.getColumnModel().getColumn(0).setCellEditor(de);
  yourTable.getColumnModel().getColumn(0).setCellRenderer(dr);That should do it !
Cheers