Table Model Listener conflict?

Question

Before I post my problem, please let me admit that I am a fairly new beginner to Java with a problem too big for my knowledge. So please bear with my ignorance.
I have created a table with a table model that changes size at the action of a button (will create as many rows as a certain user-entered value). This seems to be working fine.
The table I am creating contains some default values, but the user will need to be able to modify these values. To read these values, I need a Table Model Listener.
However, when I add the Table Model Listener, the above feature (change the size of the table at the action of the button) stops working. Is the table listener incompatible with a dynamic-sized table? Is there a step a should add in between to let the table listener know that the table data is final and read it? Am I doing things in the wrong order?
I would appreciate any suggestions, as I am quite clueless.
Thanks
maccanena

Answer 1

No that shouldn't matter, the listener is doing something you don't want, the code posted works for me.
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.EventQueue;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
public class TableTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                showUI();
    protected static void showUI() {
        Object [][] ptable = {{"p1", 2.0}};
        String[] colnamesp = { "p name:", "p value:" };
        final DefaultTableModel pTableModel = new DefaultTableModel(ptable,colnamesp);
        JTable jTable1 = new JTable(pTableModel);
        final JTextField nvarsEntry = new JTextField("1");
        JButton updateButton = new JButton("Update table");
        updateButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent updateevt) {       
                try{
                    int nvars = Integer.parseInt(nvarsEntry.getText());
                    int j;
                    int length = pTableModel.getRowCount();
                    if (length<nvars) {
                        for (j=length;j<nvars;j++) {
                            pTableModel.addRow(new Object[] {"p"+String.valueOf(j+1), 2.0});                                         
                    else if (length>nvars) {
                        for (j=nvars;j<(length+1);j++) {
                            pTableModel.removeRow(nvars);
                } catch (Exception e) {                 
        jTable1.getModel().addTableModelListener(new TableModelListener() {
            public void tableChanged(TableModelEvent evtable1) {
                int row = evtable1.getFirstRow();
                int column = evtable1.getColumn();
                // Do something with the data...
        JFrame frame = new JFrame();
        Container contentPane = frame.getContentPane();
        contentPane.add(updateButton, BorderLayout.PAGE_START);
        contentPane.add(nvarsEntry, BorderLayout.PAGE_END);
        contentPane.add(new JScrollPane(jTable1), BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
}