Please I need some help with a table

Question

Hi All
I need some help with a table.
My table needs to hold prices that the user can update.
Also has a total of the column.
my question is if the user adds in a new price how can i pick up the value they have just entered and then add it to the total which will be the last row in the table?
I have a loop that gets all the values of the column, so I can get the total but it is when the user adds in a new value that I need some help with.
I have tried using but as I need to set the toal with something like total
    totalTable.setValueAt(total, totalTable.getRowCount()-1,1); I end up with an infinite loop.
Can any one please advise on some way I can get this to work ?
Thanks for reading
Craig

Answer 1

Hi there camickr
thanks for the help the other day
this is my full code....
package printing;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import javax.swing.*;
import javax.swing.table.*;
import java.text.DecimalFormat;
public class tablePanel
    extends JDialog  implements Printable {
  BorderLayout borderLayout1 = new BorderLayout();
  private boolean printing = false;
  private Dialog1 dialog;
  JPanel jPanel = new JPanel();
  JTable table;
  JScrollPane scrollPane1 = new JScrollPane();
  DefaultTableModel model;
  private String[] columnNames = {
  private Object[][] data;
  private String selectTotal;
  private double total;
  public tablePanel(Dialog1 dp) {
    dp = dialog;
    try {
      jbInit();
    catch (Exception exception) {
      exception.printStackTrace();
  public tablePanel() {
    try {
      jbInit();
    catch (Exception exception) {
      exception.printStackTrace();
  private void jbInit() throws Exception {
    jPanel.setLayout(borderLayout1);
    scrollPane1.setBounds(new Rectangle(260, 168, 0, 0));
    this.add(jPanel);
    jPanel.add(scrollPane1, java.awt.BorderLayout.CENTER);
    scrollPane1.getViewport().add(table);
    jPanel.setOpaque(true);
    newTable();
    addToModel();
    addRows();
    setTotal();
public static void main(String[] args) {
  tablePanel tablePanel = new  tablePanel();
  tablePanel.pack();
  tablePanel.setVisible(true);
public void setTotal() {
  total = 0;
  int i = table.getRowCount();
  for (i = 0; i < table.getRowCount(); i++) {
    String name = (String) table.getValueAt(i, 1);
    if (!"".equals(name)) {
      if (i != table.getRowCount() - 1) {
        double dt = Double.parseDouble(name);
        total = total + dt;
  String str = Double.toString(total);
  table.setValueAt(str, table.getRowCount() - 1, 1);
  super.repaint();
  public void newTable() {
    model = new DefaultTableModel(data, columnNames) {
    table = new JTable() {
      public Component prepareRenderer(TableCellRenderer renderer,
                                       int row, int col) {
        Component c = super.prepareRenderer(renderer, row, col);
        if (printing) {
          c.setBackground(getBackground());
        else {
          if (row % 2 == 1 && !isCellSelected(row, col)) {
            c.setBackground(getBackground());
          else {
            c.setBackground(new Color(227, 239, 250));
          if (isCellSelected(row, col)) {
            c.setBackground(new Color(190, 220, 250));
        return c;
    table.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        if (e.getClickCount() == 2) {
        if (e.getClickCount() == 1) {
          if (table.getSelectedColumn() == 1) {
   table.setTableHeader(null);
    table.setModel(model);
    scrollPane1.getViewport().add(table);
    table.getColumnModel().getColumn(1).setCellRenderer(new TableRenderDollar());
  public void addToModel() {
    Object[] data = {
        "Price", "5800"};
    model.addRow(data);
  public void addRows() {
    int rows = 20;
    for (int i = 0; i < rows; i++) {
      Object[] data = {
      model.addRow(data);
  public void printOut() {
    PrinterJob pj = PrinterJob.getPrinterJob();
    pj.setPrintable(tablePanel.this);
    pj.printDialog();
    try {
      pj.print();
    catch (Exception PrintException) {}
  public int print(Graphics g, PageFormat pageFormat, int pageIndex) throws PrinterException {
    Graphics2D g2 = (Graphics2D) g;
    g2.setColor(Color.black);
    int fontHeight = g2.getFontMetrics().getHeight();
    int fontDesent = g2.getFontMetrics().getDescent();
    //leave room for page number
    double pageHeight = pageFormat.getImageableHeight() - fontHeight;
    double pageWidth =  pageFormat.getImageableWidth();
    double tableWidth = (double) table.getColumnModel().getTotalColumnWidth();
    double scale = 1;
    if (tableWidth >= pageWidth) {
      scale = pageWidth / tableWidth;
    double headerHeightOnPage = 16.0;
    //double headerHeightOnPage = table.getTableHeader().getHeight() * scale;
    //System.out.println("this is the hedder heigth   " + headerHeightOnPage);
    double tableWidthOnPage = tableWidth * scale;
    double oneRowHeight = (table.getRowHeight() +  table.getRowMargin()) * scale;
    int numRowsOnAPage = (int) ( (pageHeight - headerHeightOnPage) / oneRowHeight);
    double pageHeightForTable = oneRowHeight *numRowsOnAPage;
    int totalNumPages = (int) Math.ceil( ( (double) table.getRowCount()) / numRowsOnAPage);
    if (pageIndex >= totalNumPages) {
      return NO_SUCH_PAGE;
    g2.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
//bottom center
    g2.drawString("Page: " + (pageIndex + 1 + " of " + totalNumPages),  (int) pageWidth / 2 - 35, (int) (pageHeight + fontHeight - fontDesent));
    g2.translate(0f, headerHeightOnPage);
    g2.translate(0f, -pageIndex * pageHeightForTable);
    //If this piece of the table is smaller
    //than the size available,
    //clip to the appropriate bounds.
    if (pageIndex + 1 == totalNumPages) {
      int lastRowPrinted =
          numRowsOnAPage * pageIndex;
      int numRowsLeft =
          table.getRowCount()
          - lastRowPrinted;
      g2.setClip(0,
                 (int) (pageHeightForTable * pageIndex),
                 (int) Math.ceil(tableWidthOnPage),
                 (int) Math.ceil(oneRowHeight *
                                 numRowsLeft));
    //else clip to the entire area available.
    else {
      g2.setClip(0,
                 (int) (pageHeightForTable * pageIndex),
                 (int) Math.ceil(tableWidthOnPage),
                 (int) Math.ceil(pageHeightForTable));
    g2.scale(scale, scale);
    printing = true;
    try {
    table.paint(g2);
    finally {
      printing = false;
    //tableView.paint(g2);
    g2.scale(1 / scale, 1 / scale);
    g2.translate(0f, pageIndex * pageHeightForTable);
    g2.translate(0f, -headerHeightOnPage);
    g2.setClip(0, 0,
               (int) Math.ceil(tableWidthOnPage),
               (int) Math.ceil(headerHeightOnPage));
    g2.scale(scale, scale);
    //table.getTableHeader().paint(g2);
    //paint header at top
    return Printable.PAGE_EXISTS;
class TableRenderDollar extends DefaultTableCellRenderer{
    public Component getTableCellRendererComponent(
      JTable table,
      Object value,
      boolean isSelected,
      boolean isFocused,
      int row, int column) {
        setHorizontalAlignment(SwingConstants.RIGHT);
      Component component = super.getTableCellRendererComponent(
        table,
        value,
        isSelected,
        isFocused,
        row,
        column);
        if( value == null || value .equals("")){
          ( (JLabel) component).setText("");
        }else{
          double number = 0.0;
          number = new Double(value.toString()).doubleValue();
          DecimalFormat df = new DecimalFormat(",##0.00");
          ( (JLabel) component).setText(df.format(number));
      return component;
}