JTable and MouseListener

Hi,
I am using JSDK 1.3.
I am seeing some unpredictable behavior when using MouseListener on JTable.
Here's the problem:
When I click on row in the table, I am expecting that every time there is a click, application would process mouseClicked() event. However it does not always happen. I would say the event is not being fired about 5-10% of the time. I don't play with mouse listener during table selection. The mouse listener is added only once when seeting up the GUI.
Does anybody know if this is a bug with Java?
Thanks,
Boris

Hi, I'm a newbie and no expert in this, but I've had to deal with mouse listeners a lot in the past days. Apparently, those are known issues in Java, and sometimes you have to click twice in order to reset the mouse. Take a look at this, hope it helps:
http://www.javaworld.com/javaworld/javaqa/2000-07/02-qa-0714-mouse.html
Best,
Marina.

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KeyListener and MouseListener...How?

I have a JTable and I want to add some KeyListener and MouseListener events to do following functions:
- When PageDown is pressed, function NextPage(){...} is invoked
- When a row is selected, then press Enter, function Select(){...} is invoked
- Or when a row is clicked, function Select(){...} is invoked
- When ESC is pressed function Exit(){...} is invoked
Thanks all your help and sorry for my poor English :)

I think you should look at using Actions. Here is a simple example that shows how to map Actions to KeyStrokes:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class KeyboardAction extends JFrame
    public KeyboardAction()
        JPanel panel = new JPanel();
        setContentPane( panel );
        JTextField textField1 = new JTextField("Ctrl+1 or Ctrl+2", 10);
        panel.add( textField1 );
        JTextField textField2 = new JTextField("Ctrl+2", 10);
        panel.add( textField2 );
        // Change the input map of the text field,
        // therefore, Ctrl+1 only works for the first text field
        Action action1 = new SimpleAction("1");
        Object key1 = action1.getValue(Action.NAME);
        KeyStroke ks1 = KeyStroke.getKeyStroke(KeyEvent.VK_1, KeyEvent.CTRL_MASK);
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        public SimpleAction(String name)
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JTable and clipboard...

Hi all!
I'm trying to copy data from JTable to system clipboard. Here's my code that is
supposed to do that except it doesn't work. Nothing happens. The system is
Windows, rigth click invokes menu with only one position - COPY, which is served
by a appopriate ActionListener. I want to copy entire table (all data):
private class NotEditableTable extends JTable
NotEditableTable(Object[][] data, Object[] columnNames)
super(data, columnNames);
setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
setCellSelectionEnabled(true);
getTableHeader().setReorderingAllowed(false);
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return false;
private class NotEditableTableEngine extends MouseAdapter implements ActionListener
public void mouseReleased(MouseEvent e)
if (e.isPopupTrigger())
JPopupMenu menu = new JPopupMenu();
JMenuItem menuitem = new JMenuItem(Lang.TABLE_COPY, new ImageIcon("res/Copy16.gif"));
menuitem.addActionListener(this);
menu.add(menuitem);
menu.show(NotEditableTable.this, e.getX(), e.getY());
public void actionPerformed(ActionEvent e)
TransferHandler th = new TransferHandler(null);
NotEditableTable.this.setTransferHandler(th);
Clipboard clip = NotEditableTable.this.getToolkit().getSystemClipboard();
th.exportToClipboard(NotEditableTable.this, clip, TransferHandler.COPY);
}

I also tried the code above with a simple JTextField, both with text selected and not.Did my sample code use the TransferHandler??? The simple way to do it for a JTextField would be
Clipboard c = Toolkit.getDefaultToolkit().getSystemClipboard();
StringSelection testData = new StringSelection( textField.getText );
//StringSelection testData = new StringSelection( textField.getSelectedText );
c.setContents(testData, testData);
As for the table I said that the Ctrl-C KeyStroke will invoke the default Action to copy selected data from the JTable to the Clipboard. This can be tested manually by simply using Ctrl-C. If you want to invoke it in your program then you need to get the corresponding Action from the JTable and invoke the ActionPerformed method of the Action. You can try using the
getActionForKeyStroke(...) method of JComponent to get the Action.

JTable and ResultSet TableModel with big resultset

Hi, I have a question about JTable and a ResultSet TableModel.
I have to develop a swing JTable application that gets the data from a ResultSetTableModel where the user can update the jtable data.
The problem is the following:
the JTable have to contain the whole data of the source database table. Currently I have defined a
a TYPE_SCROLL_SENSITIVE & CONCUR_UPDATABLE statement.
The problem is that when I execute the query the whole ResultSet is "downloaded" on the client side application (my jtable) and I could receive (with big resultsets) an "out of memory error"...
I have investigate about the possibility of load (in the client side) only a small subset of the resultset but with no luck. In the maling lists I see that the only way to load the resultset incrementally is to define a forward only resultset with autocommit off, and using setFetchSize(...). But this solution doesn't solve my problem because if the user scrolls the entire table, the whole resultset will be downloaded...
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Are there others solutions for my problem?
Thanks in advance,
Stefano

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I explain in more detail my solution:
whith a distribuited TableModel the whole tablemodel data are on the server side and not on the client (jtable).
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For example: initially the local JTable structure contains the rows from 0 to 1000;
the user scroll down, when the cell 800 (for example) have to be displayed the method:
getValueAt(800,...)
is called.
This method will update the table structure. Now, for example, the table structure will contain data for example from row 500 to row 1500 (the data from 0 to 499 are deleted)
In this way the local table model dimension will be indipendent from the real database table dimension ...
I hope that my solution is more clear now...
under these conditions the only solutions that can work have to implement a local tablemodel with limited dimension...
Another solution without servlet and rmi that I have found is the following:
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but, the select ... limit ... offset is very dangerous when the offset is high because the database server have to do a sequential scan of all previuous records ...
with servlet (or RMI) solution instead, the entire resultset is on the server and I have only to request the data from the current resultset from row N to row N+1000 without no queries...
Thanks

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Jtable and database

hi,
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SomeBean sb = (SomeBean) data.get(row) //data = Vector of beans
switch (col)
case 0: return sb.getID();
case 1: return sb.getName();
return null;
}greetz,
Stijn

JTable and cell color

Hello, hope you can help me here -
I have a JTable, and based on the value of a certain column in a row, I want the background color of that entire row to change to a different color. How can I perform this operation?
I have tried to override JTable's prepareRenderer, but it doesn't seem to be working.
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-Kirk

Hi.
First of all. Try searching the forum there have been plenty of posts on this subject.
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import java.awt.Color;
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
public class ColorTableCellRenderer implements TableCellRenderer {
private TableCellRenderer render;
public ColorTableCellRenderer( TableCellRenderer render ){
this.render = render;
* @see javax.swing.table.TableCellRenderer#getTableCellRendererComponent(javax.swing.JTable, java.lang.Object,
* boolean, boolean, int, int)
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int row , int column ) {
if( table != null ){ //Replace with specific condition
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cmp.setBackground( Color.cyan );
//Maybe need to call a validate or setOpaque. if experiencing problems.
return cmp;
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After that the easiest to do is set the defaultCellrenderer of your table in the following fashion.
table.setDefaultRenderer(Object.class, new ColorTableCellRenderer( table.getDefaultRenderer(Object.class) ));
Or this should also work.
table.getColumnModel().getColumn(0).setCellRenderer(new ColorTableCellRenderer(chosenRenderer));
Hope this helps & Good luck!

Help with TableRowSorter , JTable and JList

Hello,
I�m developing an application in which I�m using a Jtable and Jlist to display data from a database. Jtable and Jlist share the same model.
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DBSharedModel dataModel = new DBSharedModel();
Jtable jTable = new JTable(dataModel) ;
jTable.createDefaultColumnsFromModel();
jTable.setRowSelectionAllowed(true);
TableRowSorter<DBSharedModel> sorter = new TableRowSorter <DBSharedModel> (dataModel);
jTable.setRowSorter(sorter);From what I read until now JavaSE 6 has NOT a sorter for JList (like one for JTable).
So, I am using one from a this article http://java.sun.com/developer/technicalArticles/J2SE/Desktop/sorted_jlist/index.html
When I sort the data from the table, I need to sort the data from the list, too.
My ideea is to make the Jlist an Observer for the Jtable.
My questions are:
1. How can I find if the sorter makes an ASCENDING or DESCENDING ordering?
2. How can I find what the column that is ordered?
Or if you have any idea on how can I do the ordering on Jlist to be simultaneous to Jtable .
Please help!
Thank you

Oh what the hell:
Sun's basic Java tutorial
Sun's New To Java Center. Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
http://javaalmanac.com. A couple dozen code examples that supplement The Java Developers Almanac.
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's Thinking in Java (Available online.)
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java. This one has been getting a lot of very positive comments lately.

JScrollPanel, JTable, and a HorizontalScrollBars

Am creating a JScrollPane, a JTable, and adding the table to the pane.
I am also creating MyTableMode which extends AbstractTabelModel. MyTableModel provides the interface between the JTable and my particular data. I am able to display and edit the data, that interface is working fine.
When I have more than about 10 rows of data, the vertical scroll bars appear. This is what I expect.
But if there are more columns than can be seen in the viewport, the horizontal scroll bars do not appear. This is not what I expect.
Example: if I create table with 72 rows by 72 columns, only rows 1-10 and columns 1-40 are visible (based on dialog size, preferred size, etc.). The vertical scroll bars are present, but the horizontal scroll bars are not. The user will not be able to scroll the viewport and see columns 41-72.
I've read (and re-read) the "How to use Tables" and "How to use Scrollpanes", tutorials, and do not see anything obvious. Probably missed something. I did notice that none of the table examples have horizontal scrioll bars.
Any suggestions?

It's one of those days. Here is code with the imports:
package components;
* TableDemo.java requires no other files.
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import java.awt.Dimension;
import java.awt.GridLayout;
* TableDemo is just like SimpleTableDemo, except that it
* uses a custom TableModel.
public class TableDemo extends JPanel {
    private boolean DEBUG = false;
    public TableDemo() {
        super(new GridLayout(1,0));
        JTable table = new JTable(new MyTableModel());
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);
        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);
        //Add the scroll pane to this panel.
        add(scrollPane);
    class MyTableModel extends AbstractTableModel {
        public int getColumnCount() {
            //return columnNames.length;
            return 72;
        public int getRowCount() {
            //return data.length;
            return 72;
        public String getColumnName(int col) {
            //return columnNames[col];
            return Integer.toString(col);
        public Object getValueAt(int row, int col) {
            //return data[row][col];
            return 0;
        public boolean isCellEditable(int row, int col) {
            return false;
     * Create the GUI and show it. For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("TableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        TableDemo newContentPane = new TableDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
}

JTable and mouseclicks...

I am new to Java and JFC, and I am trying to make a program that uses a table (JTable) to display some data.
I am trying to make a response to "double-clicks" on the table and I have added a mouse listener which calls MouseEvent.getClickCount() to check the number of clicks. But no matter how many times I click
MouseEvent.getClickCount() always returns 1.
The code for my mouseListener is below.
If I try with a different number in the if-condition (ie. clickCount==2) the dialog wil not show. clickCount is always set to 1 even if I double-click or not...
What could be wrong?
public class TabellMusBehandler implements MouseListener{
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {
int clickCount=e.getClickCount();
if (clickCount==1){
JOptionPane.showMessageDialog(null, "DoubleClick");
}

Thanks for the help, but the problem is still there.
However, now I think I know what's causing problem.
When I "double click" in a table-cell the cell-editor pops up. So the first click is detected by the table while the second click is detected by the cell-editor. Therefore the table never detects double-clicks.
The same thing happens if I "single click" in a cell and then start editing the cell; when editing starts the cell editor pops up, ant the table will not detect clicks in that cell as long as the cell-editor is active.
Of course, to detect clicks in the cell-editor i will have to add a mouse listener to it,but this still doesn't solve my problem as I would like to be able to detect "double-clicks" on the table itself.
I guess there must be some "built-in" mouse-listener on the JTable which causes the cell-editor to appear on "double-clicks", but how can I override this so that I can detect the "double-clicks" myself?

JTable and JAR help

Hi,
I wonder if it's possible to make a JTable not editable for users, I thought there had to be a way, but I can't seem to find the proper method.
I also wonder how you can make a mouselistener on a JTable in such a way that when you double click on a row, something happends.
And I have some probs with jar archives, I can make them, but when i try to run them, this pops up:
"Failed to load Main-Class manifest attribute from MyProgram.jar"
appreciate all help...

You set this up in your table model.
When you create your table model, or just override AbstractTableModel. Make sure that isCellEditable() always returns false.

JTable and Graphics

Hi,
I have a graphic with the axis x and y. With MouseListener, i get the mouse's coordinates. When i do 'clik' draw a point and now i want the point's coordinates in a table (JTable).
I need some ideas for make this.
Thanks for the help.

OK, thanks.
The point is that I want to chage a row of my table: X in (1, 1) and Y (1,2).
x and y are the mouse's coordinates in the graphic when i make "click".
Now i have a class "MyClass" and implements TableModelListener and i have wrotten the next listener:
intable.myModel1.addTableModelListener(this);intable: class's object with the table (JTable).
myModel: the table's model.
public void tableChanged(TableModelEvent e)
        Double x = new Double(xCursor);
        Double y = new Double(yCursor);
        int row = e.getFirstRow();
        int column = e.getColumn();
        intable.myModel1.setValueAt(x.toString(), row, column);
        intable.myModel1.setValueAt(y.toString(), row, column+1);
     }I have wrotten this to edit the cell but doesnt work :(
In my model setValueAt haves this form:
public void setValueAt(Object value, int row, int col) {
                  filaDatos[row][col] = value;
                          fireTableCellUpdated(row, col);
             }Some idea?
Thanks and sorry for my english.

Problem with JTable and JPanel

Hi,
I'm having problems with a JTable in a JPanel. The code is basicly as follows:
public class mainFrame extends JFrame
        public mainFrame()
                //A menu is implemeted giving rise to the following actions:
                public void actionPerformed(ActionEvent evt)
                        String arg = evt.getActionCommand();
                        if(arg.equals("Sit1"))
                        //cells, columnNames are initiated correctly
                        JTable table = new JTable(cells,columnNames);
                        JPanel holdingPanel = new JPanel();
                        holdingPanel.setLayout( new BorderLayout() );
                        JScrollPane scrollPane = new JScrollPane(holdingPanel);
                        holdingPanel.setBackground(Color.white);
                        holdingPanel.add(table,BorderLayout.CENTER);
                        add(scrollPane, "Center");
                        if(arg.equals("Sit2"))
                                if(scrollPane !=null)
                                        remove(scrollPane);validate();System.out.println("ScrollPane");
                                if(holdingPanel !=null)
                                        remove(holdingPanel);
                                if(table !=null)
                                        remove(table);table.setVisible(false);System.out.println("table");
                        //Put other things on the holdingPanel....
        private JScrollPane scrollPane;
        private JPanel holdingPanel;
        private JTable table;
}The problem is that the table isn't removed. When you choose another situation ( say Sit2), at first the table apparently is gone, but when you press with the mouse in the area it appeared earlier, it appears again. How do I succesfully remove the table from the panel? Removing the panel doesn't seem to be enough. Help is much appreciated...
Best regards
Schwartz

If you reuse the panel and scroll pane throughout the application,
instantiate them in the constructor, not in an often-called event
handler. In the event handler, you only do add/remove of the table
on to the panel. You can't remove the table from the container
which does not directly contain it.
if (arg.equals("Sit2")){
holdingPanel.remove(table);
holdingPanel.revalidate();
holdingPanel.repaint(); //sometimes necessary
}

Is it possible to print JTable and custom JPanel on the same page?

Hello everybody!
I have a custom panel extending JPanel and implementing Printable.
I am using paint() method to draw some graphics on it's content pane. I would like to print it, but first I would like to add a JTable at the bottom of my panel. Printing just the panel goes well. No problems with that.
I was also able to add a JTable to the bottom of JFrame, which contains my panel.
But how can I print those two components on one page?

Hi, thanks for your answer, but I thought about that earlier and that doesn't work as well... or mybe I'm doing something wrong. Here is the sample code:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTable;
public class ReportFrame extends JFrame implements Printable {
     private static final long serialVersionUID = -8291124097290245799L;
     private MyPanel rp;
     private JTable reportTable;
     private HashPrintRequestAttributeSet attributes;
     public ReportFrame() {
          rp = new MyPanel();
          String[] columnNames = { "Column1", "Column2", "Column3" };
          String[][] values = { { "Value1", "Value2", "Value3" }, { "Value4", "Value5", "Value6" }, { "Value7", "Value8", "Value9" } };
          reportTable = new JTable(values, columnNames);
          add(rp, BorderLayout.CENTER);
          add(reportTable, BorderLayout.SOUTH);
          setTitle("Printing example");
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setPreferredSize(new Dimension(700, 700));
          pack();
          setVisible(true);
     @Override
     public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
          if (pageIndex >= 1)
               return Printable.NO_SUCH_PAGE;
          Graphics2D g2D = (Graphics2D) graphics;
          g2D.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
          return Printable.PAGE_EXISTS;
     public static void main(String[] args) {
          new ReportFrame().printer();
     class MyPanel extends JPanel implements Printable {
          private static final long serialVersionUID = -2214177603101440610L;
          @Override
          public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
               if (pageIndex >= 1)
                    return Printable.NO_SUCH_PAGE;
               Graphics2D g2D = (Graphics2D) graphics;
               g2D.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
               return Printable.PAGE_EXISTS;
          @Override
          public void paint(Graphics g) {
               super.paintComponent(g);
               Graphics2D g2D = (Graphics2D) g;
               int x = 0, y = 0, width = 70, height = 70;
               for (int i = 0; i < 50; i++) {
                    g2D.drawOval(x + i * 10, y + i * 10, width, height);
     public void printer() {
          try {
               attributes = new HashPrintRequestAttributeSet();
               PrinterJob job = PrinterJob.getPrinterJob();
               job.setPrintable(this);
               if (job.printDialog(attributes))
                    job.print(attributes);
          } catch (PrinterException e) {
               JOptionPane.showMessageDialog(this, e);
}UPDATE:
I've managed to get this to work, by calling 2 methods inside the outer frame's print method (lines 78 and 79)
Those two methods are:
rp.paint(g2D);
reportTable.paint(g2D);but still it is not the way I would like it to be.
First of all both the ReportPanel and ReportTable graphics are printed with the upper-left corner located in the upper-left corner of the JFrame and the first one is covering the second.
Secondly, I would like to rather implemet the robust JTable's print method somehow, because it has some neat features like multipage printing, headers & footers. But I have no idea how to add my own graphics to the JTables print method, so they will appear above the JTable. Maybe someone knows the answer?
Thanks a lot
UPDATE2:
I was googling nearly all day in search of an answer, but with no success. I don't think it's possible to print JTable using it's print() method together with other components, so I will have to think of something else i guess...
Edited by: Adalbert23 on Nov 22, 2007 2:49 PM

JTable and MouseListener

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