Newbie to JTable

Hi ALL:
I am facing with a problem.
I am writing a JInternalFrame where I am placing my Jtable with the populated data.When I change the size of the JinternalFrame,then only can I able to view the JTable contents.Can anyone help me to rectify this problem.
And one more question.
Can I have a Listener wherein ,if single-clicked/doble-clicked on a particular row ,I am able to pop-up a JWindow(JFrame or anything like that) where I would have the contents of the Selected Row.
How to go about doing the same.I am in urgent need of this.Can anyone tell me how to go about doing this application.Supply me with Source Code if possible.
Thanking you.
Sincere Regards
Ritesh

Hi raman,
for the first question, are you putting the table in a scrollPane? Can you post a code snippt of how you add the table to the frame?
The second question I think I can help with now.
This method is from my own JTable subclass used for displayong a bunch of selected files. It isn't the best architected method you'll see but it does have the essentials.
Add a mouse listener to the table.
Listen for double-clicks.
When the double-click is heard, obtain the value appropriate for the selected row.
Do something with the object.
I added an event listener object which would decide how to treat the returned object. This kept the JTable code pretty clear and flexible (I didn't have to hard code in things like "if the file is .txt do this, or if it is .java do that etc").
          addMouseListener(new MouseAdapter() {
               public void mouseClicked(MouseEvent e) {
                    // check for double-clicks
                    if (e.getClickCount() == 2) {
                         //print the file path
                         //System.out.println("Selected file = "+ ( (File)getFile(getSelectedRow()) ).getPath() +"");
                              fireFileSelectionEvent( (File)getFile(getSelectedRow()) );
                    if( SwingUtilities.isMiddleMouseButton(e) ){
                         System.out.println("middle button pressed");
              public void mousePressed(MouseEvent e) {
                     if (e.isPopupTrigger()){
                         System.out.println("right button pressed");
              public void mouseReleased(MouseEvent e) {
                     if (e.isPopupTrigger()){
                         System.out.println("right button released");
          });//end of new MouseAdapter

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Pls hlp newbie on JTable...

Hi all,
I'm new to swing, hope someone can help me out... is there any sample code that create a JTable that when the user at the last row of the table, the JTable auto add a new (blank) row at the end of the table? So there will be 2 blank row in the table (if the user doesn't key in anything)... and if the user move to any other row that empty row will be deleted. That means my table will be always one empty row... any help frm u guys will be apperiated...
thank you.
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Problem: Is this how i update/refresh a JTable?

Newbie in JTable and Swing here.
I have created panel class which will load data from the database when first time come into this panel
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I have a piece of example code from a book that I've been working with lately. In this case when a certain combo box changes the table data is refreshed.
Here is how it's done:
if (scrollPane != null)
getContentPane().remove(scrollPane);
try
String tableName= (String)tableNames.getSelectedItem();
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String query = "SELECT * FROM " + tableName;
rs = stmt.executeQuery(query);
if (SCROLLABLE)
model = new ScrollingtbSchedule1Model(rs);
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model = new CachingtbSchedule1Model(rs);
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scrollPane = new JScrollPane(table);
getContentPane().add(scrollPane, "Center");
pack();
doLayout();
catch(SQLException e)
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Newbie: JTable & JComboBox

Hya,
As in the jtable tutorial I have created a JComboBox to present some data.
How can I call a method or do something when this combo box is used to changed the value.
e.g.
If the table column can have 3 values "Ms", "Miss" and "Mr" how can know when its changed and what is has changed to ?
just have a JOptionPane.showMessage( "MR was selected.") or something like that ?
thanks in advance

Use a TableModelListener
http://forum.java.sun.com/thread.jspa?threadID=527578&messageID=2533357

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Hi everybody,
my name is Lothar and I come from Germany. My english is not very well, but I hope you understand me an my problem.
I want to print a JTable, but I want to print a header with several headers and footers.
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h5. 2. Subtitle
Table
h5. 3. Subtitle
h5. Footer
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Here the code:
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.Date;
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        String[][] data = new String[][] { { "", "", "", "", "" },
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Nobody?
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How do I set background color of cell using JTable?

Hello all!
I have a question on the use of JTables. I am using a JDialog consisting of a JTable and a number of buttons to insert and to select OK or cancel. Everything is working perfectly, but I now must add editing capabilities to prevent invalid data being used in a SQL query to update or insert rows.
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I need to give you more info too, since the way we do things is to make it as complicated as possible for job security and to impress the newbies(or scare them back to COBOL). When I setValueAt(), I have a DefaultDataElement object that houses everything for a given column in DB2. It has column name, length, data type, is it new, original value, current value, etc. If one doesn't exist, then I create one. After all said and done, I parse thru these elements and build my update/insert query and then execute the query.
The event starts as soon as the user presses the OK button. But, if a date cell contains an invalid date, I need to halt processing (which I've done) and somehow let the user know which cell was invalid. We consider our users dumb (they really aren't, but the assumption is made), so I can't just say "error occurred in table. Verify data and try again". That won't work:-) Gotta be able to show them what cell is bad.
Any ideas?
Thanks,
Patrick

I finally figured it out. I was always close, but it wasn't until late yesterday that the light bulb came on. I was setting the background on the component in getTableCellEditorComponent() by grabbing the super.getTableCellEditorComponent(). The problem was all this was located in an editor, not renderer. So what happened was as I edited the cell the check would be performed then, not as focus was lost. When focus was lost, the red background went back to normal.
I ripped the code out and made a custom renderer and got closer. Problem was the whole column had a red background. Even specifying the row and column in getTableCellRendererComponent didn't apply just to that cell. That row and column is only for obtaining the data in the cell, but anything affecting the component will affect the column, since I added the renderer to my TableColumn:-) I need to add error logic to my model and when an error occurs, set a boolean flag in a 2 dimensional array where the row and column is used to get to it from the renderer.
Thanks for the help!!!

Implement paging (prev/next) for jtable data obtained from database

Hello all, first time poster and relative newbie to java.
I am trying to learn java and in the process have stumbled upon this issue.
I have searched through the forum as well as googled my way around for answers. And though I am more informed than I was, I still am a little stumped.
I would like to implement a table that pulls data from a database (mysql), limits the results, and include prev/next buttons to traverse through the records.
I think this involves writing my own AbstractTableModel. And I have seen some examples as such. But could use a little more help.
I will always be pulling 10 rows, but the columns will change depending on query I am using so implementing a more generic set of methods would be great.. To be specific...
Table: users
Columns: userid, ufname, ulname, utype, ustatus, etc....
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select userid, ulname, ufname from users limit index, 10
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If this can happen without the need to repaint/refresh the frame that would be great.
sudo code (with comments) would be ok, but a basic working example of this would be even better.
thank you in advance, if more information is required please let me know.

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Newbie help: Layout Managers

Hi,
as a newbie in Swing I have difficulties with the Layout Managers... I have read the Swing tutorial but it's still a little bit complicated:
I have a JPanel, I would like to add a JMenuBar, a JToolbar and then 2 additional JPanels at the top and on the left representing rulers like in the "How a Scroll Pane Works" example at
http://java.sun.com/docs/books/tutorial/uiswing/components/scrollpane.html as well as a JTable on the right.
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In a posting here at the forum I read that the MenuBar should be added to the root Pane. How do I do this? When do I use Content Pane, Layered Pane and Glass Pane?
Do you know a simple example or good tutorials at the web?
Thanks a lot!

Thank you for the link about the rulers.
The rulers goes inside your custom component. It will be like the example at http://java.sun.com/docs/books/tutorial/uiswing/components/scrollpane.html
Other stuffs layered like this.
package tmp;
import javax.swing.*;
import java.awt.*;
public class LayoutExample extends JFrame
    public static void main( String[] args ) throws Exception
        SwingUtilities.invokeAndWait( new Runnable()
            public void run()
                // All the interaction with GUI do inside the MessageLoop thread!
                LayoutExample l = new LayoutExample();
                l.pack();
                l.setVisible( true );
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    protected JToolBar mainToolBar;
    protected RulesFeaturedScrolPane scrollPane;
    public LayoutExample() throws HeadlessException
        super();
        setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
        setTitle( "Layout Example" );
        // -------------- CREATING NECESSARY CONTROLS ----------------
        // Menu
        mainMenu = new JMenuBar();
        JMenu mnuFile = mainMenu.add( new JMenu( "File" ) );
        mnuFile.add( new JMenuItem( "Open" ) );
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        mainToolBar = new JToolBar();
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        // Customized JScrollPane (with rulers)
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        getContentPane().setLayout( new BorderLayout() );
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Export data form JTable to excel

Hi! i want to export data from JTable to excel.
could you help me please?

Despite your question looks doesn't seems to be very complex, I feel pity I am a newbie can not offer you the answers. I am more familiar with exporting data to excel in C#. I've worked with a Data Grid control, just like the JTable. Here are some C# code example. Maybe you can take them as a kind of reference.
ExportToExcelML exporter = new ExportToExcelML(this.ketticGridView1);
exporter.HiddenColumnOption = Kettic.WinForm.UI.Export.HiddenOption.DoNotExport;
exporter.ExportVisualSettings = true;
exporter.SheetMaxRows = ExcelMaxRows._1048576;
exporter.SheetName = "NewSheet";
exporter.SummariesExportOption = SummariesOption.DoNotExport;
string fileName = "C:\\ExportedGridData1.xls";
exporter.RunExport(fileName);

JTable & custom cell editor

Hello everyone,
what is the correct way of writing a custom cell editor for a JTable? I followed the example in the Java tutorial ([How to use tables|http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#editor]), but the result is a bit weird. The code I have is the following:
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After I click in a cell (single click), it behaves a little different that the default cell editor: the cell is not highlighted, but it immediately jumps to the editing state (why???). I, indeed, can insert the allowed characters only. When I click in a cell, do some editing and press Enter, the cell's content gets validated. If it is invalid, stopCellEditing() method does its magic; if it is valid, the caret disappears and everything SEEMS okay. However, if I started typing at this point, the cell reverts to the editing state, but now I am able to enter any character I want. It truly looks like the cell editor is now some other component, not the original NumericFTField one. What is going on here?
It would be great is someone could provide a short schematic source of a custom cell editor class that would work exactly as the JTable's default one except it would only permit digits and so on. It doesn't have to be anything fancy, just a "skeleton" of the class with comments like "input verification here" etc.
I am sorry for any lack of clarity, but I am still a Java newbie.
Any help would be much appreciated.
Best regards,
vt

Hi,
I am also facing the same problem. In addition to what you have specified, my requirement is to be able to select multiple rows for deletion. But, the very first row selected using mouse is not visible as selected though its selected. The other rows are visible as selected.
If you can use any JDK version, start using JDK1.6. You will not be facing this problem. There were so many changes done for swings from JDK 1.4 to 1.6. But, I have to strictly use JDK1.4, but could not find any workaround for this problem.
It would be great if anyone can help me out in this issue to get workaround for this problem.

Trouble updating a JtextArea from a JTable ListSelectionListener..

Hi, I'm having trouble updating a JtextArea from a JTable ListSelectionListener, it is working for another JTextArea but I have created JNMTextArea which extends JTextArea and I am getting no data passed to it.
Any help is really greatly appreciated. Im a relative newbie to Java.
Here is the class declaration for JNMTextArea
public class JNMTextArea extends JTextArea
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          setLineWrap(true);
          setEditable(false);
     //Constructor
     public JNMTextArea()
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     void displayPacket(Packet p){
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          setCaretPosition(0);
Here is where I use JNMTextArea, Im
class JNMGui extends JFrame implements ActionListener, WindowListener{
     public static JNMTextArea txtPktContent;
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     tblPacket.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
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          rowSM.addListSelectionListener(new ListSelectionListener() {                     public void valueChanged(ListSelectionEvent e) {
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                         System.out.println("No rows are selected.");
                    else {
                         int selectedRow = lsm.getMinSelectionIndex();
                         selectedRow++;
                         String str;// = "";
                         //Unsure if I need to create this here!
                         txtPktContent = new JNMTextArea();
                         //This works perfectly
                         txtPktType.append ( "Packet No: " + Integer.toString(selectedRow) + "\n\n");
                         Packet pkt = new Packet();
                         pkt = (Packet) CaptureEngine.packets.elementAt(selectedRow);
                         if(pkt.datalink!=null && pkt.datalink instanceof EthernetPacket){
                              str = "Ethernet ";
                              //THis works txtPktType is another JTextArea!!
                              txtPktType.append ( s );
                              //This is not working
                              //I realise displayPacket return type is void but how do get
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                              txtPktContent.displayPacket(pkt);
          //Adding to ScrollPane
          tblPane = new JScrollPane(tblPacket);
          txtPktTypePane = new JScrollPane ( txtPktType );
          txtPktTypePane.setToolTipText("Packet Type");
          txtPktContentPane = new JScrollPane ( txtPktContent );
          txtPktContentPane.setToolTipText("Packet Payload");
          panel.add( tblPane, BorderLayout.CENTER );
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void displayPacket(Packet p){
          //Function works fine
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This seems really odd. Notice that you pass in "p" but use "buffer". Where is "buffer" defined?

HTML/URL in JTable

This might be a newbie question .
I am trying to create JTable with URLs/links as cells .
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thanks

You can put anything you like in a JTable cell, but it takes a bit of doing. You might as well learn how JTable operates in general. Check out the Java Tutorial.

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Thanks, Dr. Is it possible to achieve a "more dynamic behaviour"?. The parameters min,max and pref in
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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.

Listening for change events on a JTable

Hi
me = Java newbie!
Well I've been building an app to read EXIF data from JPEG files using the imageio API and Swing. Learning both along the way.
Stumbling block is that I am outputting the EXIF data into a JTable, inside a JScrollPane. These 2 components then become associated with a JInternalFrame container of the class MyInternalFrame.
Works!
Next job is to enable user to select a row in the table which then displays the image file.
I know I can use ListSelectionEvent to detect a row selection and that 2 events are fired.
I put some code into MyInternalFrame class to register a ListSelectionEvent, but I can't see how to reference MyInternalFrame from within this code....see below:
package EXIFReader;
import java.io.File;
import java.io.FilenameFilter;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
//This class constructs a table and displays it in a JInternalFrame
public class MyInternalFrame extends JInternalFrame {
static int openFrameCount = 0;
static final int xOffset = 30, yOffset = 30;
File file;
File[] directoryMembers = null;
public MyInternalFrame(File aFile) { //aFile rererences a directory containing jpeg files//
super(null,
true, //resizable
true, //closable
true, //maximizable
true);//iconifiable
file = aFile;
//Set the window's location.
this.setLocation(xOffset*openFrameCount, yOffset*openFrameCount);
FilenameFilter filter = new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith(".jpg");}};//Filter out any files in the directory that ain't jpegs
directoryMembers = file.listFiles(filter);
int i = 0;
String[][] tableData= new String [directoryMembers.length][5];
String[]headers = new String[]{"File Name","Date Taken",
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"Flash Settings"};
for (File dirfile: directoryMembers)
try {
if(dirfile!=null){
tableData[i] = new ExifReader(dirfile).getEXIFData();//populate the table with jpeg file names
i++;}}
catch (Exception ex) {
System.out.print("Error" + ex);
if (tableData[0] != null){
final JTable myTable = new JTable(tableData,headers);
this.setSize(900,(50+(directoryMembers.length)*19));
myTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
this.getContentPane().add(new JScrollPane(myTable),"Center");//add the JTable and JScrollPanel to this MyInternal Frame and display it! - cool it works!
ListSelectionModel myLSM = myTable.getSelectionModel();
myLSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent le) {
int[] rows = myTable.getSelectedRows();//want to respond to selections and then display the image as a JInternalFrame but got confused about references from within this listener - need help!
Any gentle nudges?!
P
I can respond to these events using a JFrame, but how can I display the image in a JInternalFrame?

Use code tags to post codes -- [code]CODE[/code] will display asCODEOr click the CODE button and paste your code between the {code} tags that appear.
To get better help sooner, post a [_SSCCE_|http://mindprod.com/jgloss/sscce.html] that clearly demonstrates your problem.
db

Newbie to JTable

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