Why can I only add up to 7 rows in a table???

Question

I have written the following programme
but can only allow 6 addButton clicks....(I want to allow adding unlimited number of rows)
can anyone run the code and help me out please???
import javax.swing.border.* ;
import javax.swing.* ;
import java.awt.Dimension;
import java.awt.event.* ;
import java.util.*;
import java.awt.*;
import javax.swing.table.TableColumn;
import javax.swing.JTable;
import javax.swing.DefaultCellEditor;
import javax.swing.table.*;
public class ReadingListDialog extends javax.swing.JDialog{
ReadingListDialog me;
String[] type = {"Text Book", "Online Material","Other"};
String[] columns;
JComboBox typeComboBox;
JButton editButton;
JButton cancelButton;
JButton saveButton;
JButton addButton;
JButton deleteButton;
JTable bookTable;
JTable onlineTable;
JTable otherTable;
JTabbedPane tabbedPane;
Box outerBox;
Box buttonBox;
JScrollPane bookScrollPane ;
JScrollPane onlineScrollPane ;
JScrollPane otherScrollPane ;
Vector row;     
DefaultTableModel bookModel;
DefaultTableModel onlineModel;
DefaultTableModel otherModel;
private boolean DEBUG = true;
/** Creates a new instance of ReadingListDialog */
public ReadingListDialog(java.awt.Frame parent, boolean modal, boolean edit) {
initComponents();
public void initComponents(){
me = this ;
ImageIcon icon = new ImageIcon("middle.gif");
Object[][] bookData = {
// {"Altemate Java", "Robert Sedgewick", "Library", "June 30", "p.130-150","No notes","Read"},
//{"Elementary Algebra","Ian Horthorn","Desk Copy","sep 28","p.111, p.112","important topic!!!True......hello everyone","Not Read"},
String[] bookColumn = {"Text Title",
"Author",
"Location",
"Read By Date",
"Page/Chapter",
"Note",
"Status"
DefaultTableModel bookModel = new DefaultTableModel(bookData, bookColumn);          
bookTable = new JTable(bookModel);
setUpReadingStatusColumn(bookTable.getColumnModel().getColumn(6));
bookTable.setPreferredScrollableViewportSize(new Dimension(500, 35));
Object[][] onlineData = {
// {"Google", "www.google.com", "June 30", "a search engine","Don't understand"},
// {"Waikato Uni","www.waikato.ac.nz","Sep 29","important topic!!!True......hello everyone","Half way"},
String[] onlineColumn = {"Website Name",
"URL",
"Read By Date",
"Note",
"Status"
DefaultTableModel onlineModel = new DefaultTableModel(onlineData, onlineColumn);     
onlineTable = new JTable(onlineModel);
setUpReadingStatusColumn(onlineTable.getColumnModel().getColumn(4));
onlineTable.setPreferredScrollableViewportSize(new Dimension(500, 35));
Object[][] otherData = {
//{"Lecture slide", "N/A", "June 30", "useful for assignment 2","Read"},
//{"Notes on Linear Algebra","DeskCopy","Sep 29","important topic!!!True......hello everyone","Not Read"},
String[] otherColumn = {"Material",
"Location",
"Read By Date",
"Note",
"Status"
DefaultTableModel otherModel = new DefaultTableModel(otherData, otherColumn);     
otherTable = new JTable(otherModel);
setUpReadingStatusColumn(otherTable.getColumnModel().getColumn(4));
otherTable.setPreferredScrollableViewportSize(new Dimension(500, 35));
tabbedPane = new JTabbedPane();
//create the buttons
cancelButton = new JButton("Cancel");
saveButton = new JButton("Save");
addButton = new JButton( "Add Row" );
deleteButton = new JButton("Delete Row");
//add buttons to buttonBox
buttonBox = new Box(BoxLayout.X_AXIS);
buttonBox.add(saveButton);
buttonBox.add(addButton);
buttonBox.add(deleteButton);
buttonBox.add(cancelButton);
addButton.addActionListener( new ActionListener()          {
public void actionPerformed(ActionEvent e)               {
DefaultTableModel bookModel = (DefaultTableModel)bookTable.getModel();
Object[] newRow = new Object[7];
int row = bookTable.getRowCount() + 1;
for(int k = 0; k<row; k++)
newRow[k] = "";
bookModel.addRow( newRow );
//Create the scroll pane and add the table to it.
bookScrollPane= new JScrollPane(bookTable);
onlineScrollPane = new JScrollPane(onlineTable);
otherScrollPane = new JScrollPane(otherTable);
//add the scroll panes to each tab
tabbedPane.addTab("Text Book Readings", icon, bookScrollPane, "Edit your reading list");
tabbedPane.setSelectedIndex(0);
tabbedPane.addTab("Online Readings", icon, onlineScrollPane, "Still does nothing");
tabbedPane.addTab("Other Materials", icon, otherScrollPane, "Still does nothing");
//add the tabbedPane to outerBox
outerBox = new Box(BoxLayout.Y_AXIS);
//outerBox.setBorder(new EmptyBorder(0,0,20,15));
outerBox.add(tabbedPane);
outerBox.add(buttonBox);
//add the outerBox to the pane
getContentPane().add(outerBox);
if (DEBUG) {
bookTable.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
//printDebugData(bookTable);
cancelButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
me.dispose();
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
public void setUpReadingStatusColumn(TableColumn statusColumn) {
//Set up the editor for the status cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("");
comboBox.addItem("Read");
comboBox.addItem("Just Started");
comboBox.addItem("Half way");
comboBox.addItem("Not Read");
comboBox.addItem("Don't understand");
statusColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the status cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for selecting a status");
statusColumn.setCellRenderer(renderer);
//Set up tool tip for the status column header.
TableCellRenderer headerRenderer = statusColumn.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer) {
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the satus to see a list of choices");
public static void main(String args[]) {
ReadingListDialog r = new ReadingListDialog(new javax.swing.JFrame(), true, true);
r.setSize(new Dimension(600,500));
r.show();

Answer 1

Try this
public void actionPerformed(ActionEvent e) {
DefaultTableModel bookModel = (DefaultTableModel)bookTable.getModel();
Object[] newRow = new Object[] {};
//int row = bookTable.getRowCount() + 1;
//for(int k = 0; k<row; k++)
//newRow[k] = "";
bookModel.addRow( newRow );