JTable in ActiveX

Hello,
Is it possible to embed a JTable bean with the ActiveX bridge?
More specifically, how could you create and set the TableModel?
Thanks in advance.

Hi!
In order to find the rectangle, simply call:
public Rectangle getCellRect(int aRow, int aColumn, boolean includeSpacing)
You can then use the rectangle in the method mentionned in the previous message.
Kriket

Similar Messages

How to create ActiveX control in Java

I know there are lots of experts in this forum
thats y i'm putting this general question.
Will all devices come with an Active X Control.
"To capture a device's events we can use ActiveX Control."
Hows this statement implemented.???
Thanks for the Sample code

I am new to this. I want to display the data from database like a grid control. Ok, what problems are you having. You been given a link to the tutorial which shows you how to build a table.
There is also a tutorial on [url http://java.sun.com/docs/books/tutorial/]JDB Database Access here:
http://java.sun.com/docs/books/tutorial/
Start by creating your SQL statement and iterating throught the ResultSet. Once you know how to do that, instead of outputting the data you simply build a DefaultTableModel and create the JTable.

JTable question regarding Index/ID's from a VB guy

Greets!
So i am coming from VB6 where i use an ActiveX object table to display data from a SQL database table. When populating the table i include the 'ID' field from the database table as a hidden column. So when a user selects a row, i pull the hidden column's ID# and use that to do whatever (bring up another edit form, etc)
So here i am in Java now, i've been playing with jTable for a while now and seem to be getting the hang of the basics, but when i replicated the above scenario, hiding the ID column had weird results (cursor would dissappear when i scroll over with the arrow keys). I also saw another post where another person said that along with populating the jTable i should also have an array that stores the ID that matches the RowIndex from the jTable itself.
This is the table model that i am using:
public class jTableModel extends AbstractTableModel {
    private double xTotal;
    private int colnum;
    private int rownum;
    private String[] colNames;
    private ArrayList<Object[]> ResultSets;
    private Icon zIcon;
    /** Creates a new instance of FoodTableModel */
    public jTableModel(ResultSet rs,frmMain frm) {
      ResultSets=new ArrayList<Object[]>();
      Icon icon1 = new ImageIcon(getClass().getResource("/main/images/bullet_ball_glass_blue.png"));
      Icon icon2 = new ImageIcon(getClass().getResource("/main/images/bullet_ball_glass_red.png"));
      Icon icon3 = new ImageIcon(getClass().getResource("/main/images/bullet_ball_glass_green.png"));
      try{
        while(rs.next()){
            switch (rs.getInt("Type")) {
                case 1: zIcon = icon1; break;
                case 2: zIcon = icon2; break;
                case 3: zIcon = icon3; break;
            Object[] row={zIcon,rs.getString("Name"),rs.getString("Description"),rs.getString("ID")};
            ResultSets.add(row);
        String[] zNames={
            "","Name","Description","ID"
        colNames = zNames;
        colnum=4;
      catch(Exception e){
          System.out.println("(jTableModel: There was an error: " + e);
    public Object getValueAt(int rowindex, int columnindex) {
       Object[] row=ResultSets.get(rowindex);
       return row[columnindex];
    public int getRowCount() {
        return ResultSets.size();
    public int getColumnCount() {
        return colnum;
    @Override
    public String getColumnName(int param) {
       return colNames[param];
    public double getTotal() {
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    @Override
    public Class getColumnClass(int column) {
     return getValueAt(0, column).getClass();
    }Can anyone give me any tips in this area or point me in the right direction?
Any help would be appreciated.

Dear Poster,
As no response has been provided to the thread in some time I must assume the issue is resolved, if the question is still valid please create a new thread rephrasing the query and providing as much data as possible to promote response from the community.
Best Regards,
SDN SRM Moderation Team

Excel Get ActiveX References.vi and closing references -- grrr

I'm new to ActiveX stuff, but eager to learn!
The "grrr" in my Subject line is a reference to how I feel about LabVIEW's documentation from time to time. I'm a dinosaur who came from text-based programming, and did a fair amount of C coding, so sometimes with LabVIEW I'm left with this awful feeling in the pit of my stomach like, "Good grief! How much memory must LabVIEW be hogging up in the background when I use this vi?" or "What happens to those variables (wires) in that subVI when it completes but doesn't close? What are their statuses when I come back in the next time?" or "What if I put a lot of elements into that array the first time and then started from element zero the second time and just put in a few? What has happened with the memroy that was allocated when there were a lot of elements?"
Today I'm stewing about this "Excel Get ActiveX References.vi," and what happens to the "ActiveX references" it generates each time I call the subVI in which "Excel Get ActiveX References.vi" lives. I think that at least one of the "ActiveX references" it generates when I call it is of the type Excel._Application. Then there appears to be an Excel._Workbook, and others. You see, I've used "Excel Easy Report.vi" to put some data into an Excel spreadsheet, and I want to tell Excel to do a "Save" on the open spreadsheet. I think ActiveX is the (a) right way to do that, so I'm wading into the ActiveX fray... But this "Excel Get ActiveX References.vi" says in its help file, "Do not close ActiveX references opened with the Excel Get ActiveX References VI. References must remain open until the report is closed. Otherwise the error 3001 will occur." Well, these Excel workbooks that get created by my VI could well stay open until after my LabVIEW VI terminates!
So (finally), here are some of my quesitons:
1) When I go through my subVI once, pointing to one workbook, I'll get one set of references "created" or "opened" or whatever you call it when ActiveX references spring into existance. Now, when I exit the subVI, is it going to automatically try to "close" those ActiveX references? I don't suppose so, since subVI's stay in memory until the calling VI closes.
2) Now, I come back into my subVI a second time. New workbook gets created, so I get new references. Ok, fine. Uh oh! What happened to those old references? I suppose that if I didn't somehow save them off, I've probably lost the ability to get them back (maybe I'm wrong, but I don't need them back), but is LabVIEW going to "close" those old references (from previous times through the subVI) because I can't get to them anymore? Won't that cause the dreaded error 3001? If LabVIEW is not going to "close" them, what in tarnation happens to them (the old C programmer in me creeping back out)?? Now it's some oddball, orphaned reference, floating out there, hogging memory, waiting to make something crash intermittently and be a debugging nightmare?
3) Now, here's the real scary one. I think I might dodge the "error 3001" bullet in questions 1) and 2), but now let's say the user closes my LabVIEW application while Excel is still open. All those workbooks are still open. Presumably, all those ActiveX references I was not supposed to close are still open. I really hope that LabVIEW is decent enough to close/erase/delete/blow-away (whatever the right word is) all those ActiveX references which were opened/created by "Excel Get ActiveX References.vi" when my program terminates. But, oh no! Won't the error 3001 come along then? I suppose I can just dump it in the shutdown error handling.
Well, thanks for reading my novel. I don't know what can be done with LabVIEW documentation to make it more satisfying to folks like me, but perhaps someone can weigh in on all my ActiveX questions here.
Thank you in advance,
Steve Brady
Solved!
Go to Solution.

You need to close EVERY ActiveX reference you open. If you don't you'll end up with some Excel processes running even after LabVIEW exits. You can see them in Task Manager.
I, personally, don't like the LabVIEW Report Generation Tool Kit for working with Excel. I don't think it's flexible enough. I have a growing library of VIs that I've written that open, manipulate, and close Excel. Some references I pass from VI to VI and some I close right after I use them. It all depends on what I'm doing. If I want to enter read or write data from/to a certain range I'll get the range reference, read or write the data, then close it right away because I have no use for it any more. On the other hand, when I open Excel or a Workbook I keep the reference until I'm done, which could be later in the program.
1) When I go through my subVI once, pointing to one workbook, I'll get one set of references "created" or "opened" or whatever you call it when ActiveX references spring into existence. Now, when I exit the subVI, is it going to automatically try to "close" those ActiveX references? I don't suppose so, since subVI's stay in memory until the calling VI closes.
2) Now, I come back into my subVI a second time. New workbook gets created, so I get new references. Ok, fine. Uh oh! What happened to those old references? I suppose that if I didn't somehow save them off, I've probably lost the ability to get them back (maybe I'm wrong, but I don't need them back), but is LabVIEW going to "close" those old references (from previous times through the subVI) because I can't get to them anymore? Won't that cause the dreaded error 3001? If LabVIEW is not going to "close" them, what in tarnation happens to them (the old C programmer in me creeping back out)?? Now it's some oddball, orphaned reference, floating out there, hogging memory, waiting to make something crash intermittently and be a debugging nightmare?
3) Now, here's the real scary one. I think I might dodge the "error 3001" bullet in questions 1) and 2), but now let's say the user closes my LabVIEW application while Excel is still open. All those workbooks are still open. Presumably, all those ActiveX references I was not supposed to close are still open. I really hope that LabVIEW is decent enough to close/erase/delete/blow-away (whatever the right word is) all those ActiveX references which were opened/created by "Excel Get ActiveX References.vi" when my program terminates. But, oh no! Won't the error 3001 come along then? I suppose I can just dump it in the shutdown error handling.
1) No, LabVIEW will NOT close those references. You need to make sure that happens.
2) You can save the references in a functional global or use a class but if you're not going to save them close them as soon as you're done with them.
3) Your user should not be able to close your LabVIEW application without it going through the shutdown routine you've created for your program. The ABORT button should never be exposed to the user and you should capture and discard the panel close event so your program ALWAYS shuts down is an orderly fashion. If you don't you will have fragments of Excel hanging around in your operating system and will have to kill those processes using Task Manager. That should only be a problem during development, not once deployed.
I used to program in C and Assembly many moons ago. You should have seen my first LabVIEW code. I go back and look at it just so I can see how far I've come in the last 12 years. I feel your pain.
Kelly Bersch
Certified LabVIEW Developer
Kudos are always welcome

How to disable IE Security Warning on opening a "local" visio file with Visio Viewer ActiveX?

Hello all,
Everyone knows that Microsoft released ActiveX based Visio Viewer for free and allow the users to open Visio drawing and view/print via IE browser.
The problem that I am facing is that some users are complaining about IE browser's security warning on "active content to run in files on My Computer".
It means that opening .VSD files from the network, internet, intranet would be all OK but if the user wants to open .VSD files from the local hard drive (or open it as a mail attachment, which will extract it to a temp folder), it prompt the user to select "Allow Blocked Content" EVERYTIME they open them.
I know that I can GLOBALLY disable this warning by going through Tools - Internet Options - Security section and enable "Allow active content to run in files on My Computer" but I hope that there is a way (or workaround) to allow them by file type or location, etc.
Questions:
1. Is there any way to disable those warning for all .VSD only while we still UNCHECK the option on Internet Options?
2. Is there any 3rd party Win32 based viewer which wouldn't have those restriction?
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Thanks in advance?
Young-

Are you able to host/launch the VSD file via an HTM page? In that case you can format the HTM page as shown below. This will trick IE into thinking it is loading the file off of a website. Commonly called 'mark of the web'.
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
</html>

How do I get at a JTable on a JInternalFrame?

I've been working on this Multiple Document Interface application, and things have been great up to this point. The user chooses to run a "report" and then selects an entity to get the info for. I then hit the database. Each row returned from the database query goes into it's own data object, which is added to an ArrayList in my custom table model, and that ArrayList is used to generate the JTable, which is then added to a ScrollPane, which is then added to the JInternalFrame, which is then added to the JDesktop pane. Good stuff, right?
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Well, if you only have a single component on the internal frame then you can use getComponent(0). But then you need to go up the parent chain to get the actual table. You will initially get the JScrollPane, then use that to get the JViewport and then use that to get the viewport component.
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JTable - Can I change the color of the text on a row by row basis?

Hi All,
I'm redoing a bit of old uni coursework (to model a stockmarket, stock ticker server & stock ticker application) to brush up my Java skills (esp Swing and Event Handling) and am programming the UI by hand using Swing (its the only way to learn something....(I've certianly nailed Layout Management!!))
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Hello pcyservice
There is NOT a way to downgrade/roll-back/revert to a previous firmware without wiping all data. This is specifically mentioned on the firmware update page:
" CAUTION!
This update is not data destructive, however, ALWAYS back up your data before performing any firmware update!
Once you have updated the firmware, you will NOT be able to revert to an older firmware version."
I recommend you disable any unnecessary features/protocols such as Media Server and Active Folders, then reboot the unit.
If you are still experiencing performance issues, please contact LenovoEMC support to troubleshoot further.
LenovoEMC Contact Information is region specific. Please select the correct link then access the Contact Us at the top right:
US and Canada: https://lenovo-na-en.custhelp.com/
Latin America and Mexico: https://lenovo-la-es.custhelp.com/
EU: https://lenovo-eu-en.custhelp.com/
India/Asia Pacific: https://lenovo-ap-en.custhelp.com/
http://support.lenovoemc.com/

How to select a specific cell in a JTable?

Hi there,
in a JTable, I would like to select a specific cell (to highlight it) from a JButton.
Here a sample code...
Who could help me to fill it?
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
public class TableSelection{
    public static void main (String args[]) {
      JFrame frame = new MyFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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class MyFrame extends JFrame{
public MyFrame(){
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private static final int WIDTH=200;
private static final int HEIGHT=200;
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Denis

Use the addColumnSelectionInterval(int index1, int index2)method ~ http://java.sun.com/j2se/1.4/docs/api/javax/swing/JTable.html#addColumnSelectionInterval(int,%20int)
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Hope that helped.
afotoglidis

Create a JTable based on an ArrayList containing instances of a class.

I have a class, IncomeBudgetItem, instances of which are contained in an ArrayList. I would like to create a JTable, based on this ArrayList. One variable is a string, while others are type double. Not all variables are to appear in the JTable.
The internal logic of my program is already working. And my GUI is largely constructed. I'm just not sure how to make them talk to each other. The actually creation of the JTable is my biggest problem right now.

import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.ArrayList;
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import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
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     private static void createAndShowGUI() {
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          frame.pack();
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Error in updating Jtable Database

package desktopapplication1; import java.util.*; import java.sql.*; import javax.swing.JOptionPane; import javax.swing.table.*; public class Datab extends DefaultTableModel { private Connection conn; private Statement st; private ResultSet rs; private ResultSetMetaData rsmd; private int rows; public Datab(String driver, String url, String query) throws SQLException, ClassNotFoundException { Class.forName(driver); conn = DriverManager.getConnection(url); st = conn.createStatement(rs.TYPE_SCROLL_SENSITIVE,rs.CONCUR_UPDATABLE); if ( query.substring(0,3).equalsIgnoreCase("INS") ) { st.executeUpdate(query); } else if ( query.substring(0,3).equalsIgnoreCase("DEL") ) { st.executeUpdate(query); } else { rs = st.executeQuery(query); rsmd = rs.getMetaData(); rs.last(); rows = rs.getRow(); } fireTableStructureChanged(); } public String getColumnName(int column){ try{ return rsmd.getColumnName(column+1); }catch(Exception e){ e.printStackTrace(); } return ""; } public int getColumnCount(){ try{ return rsmd.getColumnCount(); }catch(Exception e){ e.printStackTrace(); } return 0; } public int getRowCount(){ try{ return rows; }catch(Exception e){ e.printStackTrace(); } return 0; } public Object getValueAt(int row, int column){ try{ rs.absolute(row+1); return rs.getObject(column+1); }catch(Exception e){ e.printStackTrace(); } return ""; } public Class getColumnClass(int c) { return getValueAt(0, c).getClass(); } public boolean isCellEditable(int row, int column) { if (column < 0) { return false; } else { return true; } } public void setValueAt(Object value, int row, int column){ try{ int conf = JOptionPane.showConfirmDialog(null,"You wanna reaplace "+getValueAt(row,column)+" with "+value+"?", null, 2); if ( conf == 0 ) { rs.absolute(row+1); System.out.println("ROW = "+row+"CURSOR = "+(row+1)+""+rs.getString(1)+column); rs.updateString("Recipe","test"); //i tried to use a simple update cause the normal was not running but same error+ rs.updateRow(); }else { System.out.println("0"); } }catch(SQLException sqle){ System.err.println("Error setting value at row "+row+" column "+column+" with value "+value); sqle.printStackTrace(); } } }
hi, when i click on my table to edit a value, it give me an error and sometimes fill the cell with a value like [B@341j0j
Error setting value at row 1 column 0 with value soup2
java.sql.SQLException: [Microsoft][Driver ODBC Microsoft Access]Error in row
at sun.jdbc.odbc.JdbcOdbcResultSet.setPos(JdbcOdbcResultSet.java:5271)
at sun.jdbc.odbc.JdbcOdbcResultSet.updateRow(JdbcOdbcResultSet.java:4171)
at desktopapplication1.Datab.setValueAt(Datab.java:104)
at javax.swing.JTable.setValueAt(JTable.java:2719)
at javax.swing.JTable.editingStopped(JTable.java:4721)
at javax.swing.AbstractCellEditor.fireEditingStopped(AbstractCellEditor.java:125)
at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(DefaultCellEditor.java:350)
at javax.swing.DefaultCellEditor.stopCellEditing(DefaultCellEditor.java:215)
at javax.swing.JTable$GenericEditor.stopCellEditing(JTable.java:5475)
at javax.swing.DefaultCellEditor$EditorDelegate.actionPerformed(DefaultCellEditor.java:367)
at javax.swing.JTextField.fireActionPerformed(JTextField.java:492)
at javax.swing.JTextField.postActionEvent(JTextField.java:705)
at javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:820)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
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at javax.swing.JComponent.processKeyBindings(JComponent.java:2886)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2814)
at java.awt.Component.processEvent(Component.java:6040)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:704)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:969)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:841)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:668)
at java.awt.Component.dispatchEventImpl(Component.java:4502)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
my db is like
RecipeName intvalue1 intvalue2 intvalue3 stringvalue4
soup 3 2 11 fish
chocolate 3 2 44 dessert
Edited by: kainard on Aug 1, 2010 2:31 PM
Edited by: kainard on Aug 1, 2010 2:37 PM

Can you explain why you declare
private Connection conn;
private Statement st;
private ResultSet rs;
private ResultSetMetaData rsmd;
as private

Need help trying to create a ActiveX registered event

I am trying to create a register event for an ActiveX component. The problem I am having is creating the callback vi. When I right click on the VI ref and create the callback vi it is created with the user parameter as a variant. I would like this to be a control refnum. If I open the callback vi and replace the user parameter variant with a control refnum the wire from the callback vi to the VI ref is broken. How do I change the user parameter?

Joe is correct on this one. The callback where designed to take variants as their inputs, so that they are more flexible. In addition Variants are used through out ActiveX programming.
If you have a control reference that you want to pass into the VI, all you need to use is the "To Variant" function in the main VI to turn the reference into a variant. You can then inside the Callback VI you can use the Variant to Data VI to change the variant back to a reference; you simply where a constant of the reference type to the "Type" terminal.
Evan
National Instruments

URGENT HELP NEEDED FOR JTABLE PROBLEM!!!!!!!!!!!!!!!!!

firstly i made a jtable to adds and deletes rows and passes the the data to the table model from some textfields. then i wanted to add a tablemoselistener method in order to change the value in the columns 1,2,3,4 and set the result of them in the column 5. when i added that portion of code the buttons that added and deleted rows had problems to function correctly..they dont work at all..can somebody have a look in my code and see wot is wrong..thanx in advance..
below follows the code..sorry for the mesh of the code..you can use and run the code and notice the problem when you press the add button..also if you want delete the TableChanged method to see that the add button works perfect.
* Created on 03-Aug-2005
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
* @author Administrator
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import java.io.*;
public class NodesTable extends JFrame implements TableModelListener, ActionListener {
JTable jt;
DefaultTableColumnModel dtcm;
TableColumn column[] = new TableColumn[100];
DefaultTableModel dtm;
JLabel Name,m1,w1,m2,w2;
JTextField NameTF,m1TF,w1TF,m2TF,w2TF;
String c [] ={ "Name", "Assessment1", "Weight1" , "Assessment2","Weight2 ","TotalMark"};
float x=0,y=0,tMark=0,z = 0;
float j=0;
int i;
     JButton DelButton;
     JButton AddButton;
     JScrollPane scrollPane;
     JPanel mainPanel,buttonPanel;
     JFrame frame;
     Object[][] data =
          {"tami", new Float(1), new Float(1.11), new Float(1.11),new Float(1),new Float(1)},
          {"tami", new Float(1), new Float(2.22), new Float(2.22),new Float(1),new Float(1)},
          {"petros", new Float(1), new Float(3.33), new Float(3.33),new Float(1),new Float(1)},
          {"petros", new Float(1), new Float(4.44), new Float(4.44),new Float(1),new Float(1)}
public NodesTable() {
super("Student Marking Spreadsheet");
this.AddNodesintoTable();
setSize(400,250);
setVisible(true);
public void AddNodesintoTable(){
// Create a vector object and load them with the data
// to be placed on each row of the table
dtm = new DefaultTableModel(data,c);
dtm.addTableModelListener( this );
jt = new JTable(dtm){
     // Returning the Class of each column will allow different
          // renderers to be used based on Class
          public Class getColumnClass(int column)
               return getValueAt(0, column).getClass();
          // The Cost is not editable
          public boolean isCellEditable(int row, int column)
               int modelColumn = convertColumnIndexToModel( column );
               return (modelColumn == 5) ? false : true;
//****************************User Input**************************
//Add another node
//Creating and setting the properties
//of the panel's component (panels and textfields)
Name = new JLabel("Name");
Name.setForeground(Color.black);
m1 = new JLabel("Mark1");
m1.setForeground(Color.black);
w1 = new JLabel("Weigth1");
w1.setForeground(Color.black);
m2= new JLabel("Mark2");
m2.setForeground(Color.black);
w2 = new JLabel("Weight2");
w2.setForeground(Color.black);
NameTF = new JTextField(5);
NameTF.setText("Node");
m1TF = new JTextField(5);
w1TF = new JTextField(5);
m2TF=new JTextField(5);
w2TF=new JTextField(5);
//creating the buttons
JPanel buttonPanel = new JPanel();
AddButton=new JButton("Add Row");
DelButton=new JButton("Delete") ;
buttonPanel.add(AddButton);
buttonPanel.add(DelButton);
//adding the components to the panel
JPanel inputpanel = new JPanel();
inputpanel.add(Name);
inputpanel.add(NameTF);
inputpanel.add(m1);
inputpanel.add(m1TF);
inputpanel.add(w1);
inputpanel.add(w1TF);
inputpanel.add(m2);
inputpanel.add(m2TF);
inputpanel.add(w2TF);
inputpanel.add(w2);
inputpanel.add(AddButton);
inputpanel.add(DelButton);
//creating the panel and setting its properties
JPanel tablepanel = new JPanel();
tablepanel.add(new JScrollPane(jt, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED
, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS));
getContentPane().add(tablepanel, BorderLayout.CENTER);
getContentPane().add(inputpanel, BorderLayout.SOUTH);
//Method to add row for each new entry
public void addRow()
Vector r=new Vector();
r=createBlankElement();
dtm.addRow(r);
jt.addNotify();
public Vector createBlankElement()
Vector t = new Vector();
t.addElement((String) " ");
t.addElement((String) " ");
t.addElement((String) " ");
t.addElement((String) " ");
t.addElement((String) " ");
return t;
// Method to delete a row from the spreadsheet
void deleteRow(int index)
if(index!=-1) //At least one Row in Table
dtm.removeRow(index);
jt.addNotify();
// Method that adds and deletes rows
// from the table by pressing the
//corresponding buttons
public void actionPerformed(ActionEvent ae){
     Float z=new Float (m2TF.getText());
String Name= NameTF.getText();
Float x= new Float(m1TF.getText());
Float y= new Float(w1TF.getText());
Float j=new Float (w2TF.getText());
JFileChooser jfc2 = new JFileChooser();
String newdata[]= {Name,String.valueOf(x),String.valueOf(y),
String.valueOf(z),String.valueOf(j)};
Object source = ae.getSource();
if(ae.getSource() == (JButton)AddButton)
addRow();
if (ae.getSource() ==(JButton) DelButton)
deleteRow(jt.getSelectedRow());
//method to calculate the total mark in the TotalMark column
//that updates the values in every other column
//It takes the values from the column 1,2,3,4
//and changes the value in the column 5
public void tableChanged(TableModelEvent e) {
     System.out.println(e.getSource());
     if (e.getType() == TableModelEvent.UPDATE)
          int row = e.getFirstRow();
          int column = e.getColumn();
          if (column == 1 || column == 2 ||column == 3 ||column == 4)
               TableModel model = jt.getModel();
          float     q= ((Float)model.getValueAt(row,1)).floatValue();
          float     w= ((Float)model.getValueAt(row,2)).floatValue();
          float     t= ((Float)model.getValueAt(row,3)).floatValue();
          float     r= ((Float)model.getValueAt(row,4)).floatValue();
               Float tMark = new Float((q*w+t*r)/(w+r) );
               model.setValueAt(tMark, row, 5);
// Which cells are editable.
// It is only necessary to implement this method
// if the table is editable
public boolean isCellEditable(int row, int col)
{ return true; //All cells are editable
public static void main(String[] args) {
     NodesTable t=new NodesTable();
}

There are too many mistakes in your program. It looks like you are new to java.
Your add and delete row buttons are not working because you haven't registered your action listener with these buttons.
I have modifide your code and now it works fine. Just put some validation code for the textboxes becuase it throws exception when user presses add button without entering anything.
Here is the updated code: Do the diff and u will know my changes
* Created on 03-Aug-2005
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
* @author Administrator
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;
public class NodesTable extends JFrame implements TableModelListener,
          ActionListener {
     JTable jt;
     DefaultTableColumnModel dtcm;
     TableColumn column[] = new TableColumn[100];
     DefaultTableModel dtm;
     JLabel Name, m1, w1, m2, w2;
     JTextField NameTF, m1TF, w1TF, m2TF, w2TF;
     String c[] = { "Name", "Assessment1", "Weight1", "Assessment2", "Weight2 ",
               "TotalMark" };
     float x = 0, y = 0, tMark = 0, z = 0;
     float j = 0;
     int i;
     JButton DelButton;
     JButton AddButton;
     JScrollPane scrollPane;
     JPanel mainPanel, buttonPanel;
     JFrame frame;
     public NodesTable() {
          super("Student Marking Spreadsheet");
          this.AddNodesintoTable();
          setSize(400, 250);
          setVisible(true);
     public void AddNodesintoTable() {
          // Create a vector object and load them with the data
          // to be placed on each row of the table
          dtm = new DefaultTableModel(c,0);
          dtm.addTableModelListener(this);
          jt = new JTable(dtm) {
               // The Cost is not editable
               public boolean isCellEditable(int row, int column) {
                    int modelColumn = convertColumnIndexToModel(column);
                    return (modelColumn == 5) ? false : true;
          //****************************User Input**************************
          //Add another node
          //Creating and setting the properties
          //of the panel's component (panels and textfields)
          Name = new JLabel("Name");
          Name.setForeground(Color.black);
          m1 = new JLabel("Mark1");
          m1.setForeground(Color.black);
          w1 = new JLabel("Weigth1");
          w1.setForeground(Color.black);
          m2 = new JLabel("Mark2");
          m2.setForeground(Color.black);
          w2 = new JLabel("Weight2");
          w2.setForeground(Color.black);
          NameTF = new JTextField(5);
          NameTF.setText("Node");
          m1TF = new JTextField(5);
          w1TF = new JTextField(5);
          m2TF = new JTextField(5);
          w2TF = new JTextField(5);
          //creating the buttons
          JPanel buttonPanel = new JPanel();
          AddButton = new JButton("Add Row");
          AddButton.addActionListener(this);
          DelButton = new JButton("Delete");
          DelButton.addActionListener(this);
          buttonPanel.add(AddButton);
          buttonPanel.add(DelButton);
          //adding the components to the panel
          JPanel inputpanel = new JPanel();
          inputpanel.add(Name);
          inputpanel.add(NameTF);
          inputpanel.add(m1);
          inputpanel.add(m1TF);
          inputpanel.add(w1);
          inputpanel.add(w1TF);
          inputpanel.add(m2);
          inputpanel.add(m2TF);
          inputpanel.add(w2TF);
          inputpanel.add(w2);
          inputpanel.add(AddButton);
          inputpanel.add(DelButton);
          //creating the panel and setting its properties
          JPanel tablepanel = new JPanel();
          tablepanel.add(new JScrollPane(jt,
                    JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                    JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS));
          getContentPane().add(tablepanel, BorderLayout.CENTER);
          getContentPane().add(inputpanel, BorderLayout.SOUTH);
     //Method to add row for each new entry
     public void addRow() {
          Float z = new Float(m2TF.getText());
          String Name = NameTF.getText();
          Float x = new Float(m1TF.getText());
          Float y = new Float(w1TF.getText());
          Float j = new Float(w2TF.getText());
          String newdata[] = { Name, String.valueOf(x), String.valueOf(y),
                    String.valueOf(z), String.valueOf(j) };
          dtm.addRow(newdata);
     // Method to delete a row from the spreadsheet
     void deleteRow(int index) {
          if (index != -1) //At least one Row in Table
               dtm.removeRow(index);
               jt.addNotify();
     // Method that adds and deletes rows
     // from the table by pressing the
     //corresponding buttons
     public void actionPerformed(ActionEvent ae) {
          Object source = ae.getSource();
          if (ae.getSource() == (JButton) AddButton) {
               addRow();
          if (ae.getSource() == (JButton) DelButton) {
               deleteRow(jt.getSelectedRow());
     //method to calculate the total mark in the TotalMark column
     //that updates the values in every other column
     //It takes the values from the column 1,2,3,4
     //and changes the value in the column 5
     public void tableChanged(TableModelEvent e) {
          System.out.println(e.getSource());
          //if (e.getType() == TableModelEvent.UPDATE) {
               int row = e.getFirstRow();
               int column = e.getColumn();
               if (column == 1 || column == 2 || column == 3 || column == 4) {
                    TableModel model = jt.getModel();
                    float q = (new Float(model.getValueAt(row, 1).toString())).floatValue();
                    float w = (new Float(model.getValueAt(row, 2).toString())).floatValue();
                    float t = (new Float(model.getValueAt(row, 3).toString())).floatValue();
                    float r = (new Float(model.getValueAt(row, 4).toString())).floatValue();
                    Float tMark = new Float((q * w + t * r) / (w + r));
                    model.setValueAt(tMark, row, 5);
     // Which cells are editable.
     // It is only necessary to implement this method
     // if the table is editable
     public boolean isCellEditable(int row, int col) {
          return true; //All cells are editable
     public static void main(String[] args) {
          NodesTable t = new NodesTable();
}

Can not show the JCheckBox in JTable cell

I want to place a JCheckBox in one JTable cell, i do as below:
i want the column "d" be a check box which indicates "true" or "false".
String[] columnNames = {"a","b","c","d"};
Object[][] rowData = {{"", "", "", Boolean.FALSE}};
tableModel = new DefaultTableModel(rowData, columnNames);
dataTable = new JTable(tableModel);
dataTable.getColumnModel().getColumn(3).setCellEditor(new DefaultCellEditor(new JCheckBox()));
But when i run it, the "d" column show the string "false" or "true", not the check box i wanted.
I do not understand it, can you help me?
Thank you very much!
coral9527

Do not use DefaultTableModel, create your own table model and you should implement the method
getColumnClass to display the boolean as checkbox ...
I hope the following colde snippet helps you :
class MyModel extends AbstractTableModel {
          private String[] columnNames = {"c1",
"c2"};
public Object[][] data ={{Boolean.valueOf(true),"c1d1"}};
     public int getColumnCount() {
     //System.out.println("Calling getColumnCount");
     return columnNames.length;
public int getRowCount() {
//System.out.println("Calling row count");
return data.length;
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
return data[row][col];
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
* Don't need to implement this method unless your table's
* editable.
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
return true;
* Don't need to implement this method unless your table's
* data can change.
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);

Display data in JTable

I am trying to display data from database into the JTable swing component. I can see the table and the heading coming from the vector. I cannot see why the data from the databse table is not loaded on to the Jtable. I just get a table with 6 rows blank.
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.sql.*;
import java.util.*;
public class dataTable extends JApplet
String dbdriver="jdbc:oracle:thin:@ds1.ctateu.edu:1521:wpac";
String dbuser="system";
String dbpass="pass";
Container c;
JScrollPane jsp;
JTable table;
int v,h;
Connection connection;
Statement stmt;
ResultSet rs;
String param_start,param_end, param_disp_start, param_disp_end,param_shortdesc, param_longdesc;
public void init()
c= getContentPane();
c.setLayout (new BorderLayout());
v=ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
Vector heading = new Vector();
heading.addElement("Event Start Date");
heading.addElement("Event End Date");
heading.addElement("Display Start Date");
heading.addElement("Display End Date");
heading.addElement("Short Description");
heading.addElement("Long Description");
Vector data = new Vector();
try
Class.forName("oracle.jdbc.driver.OracleDriver");
connection=DriverManager.getConnection(dbdriver,dbuser,dbpass);
stmt=connection.createStatement();
rs= stmt.executeQuery("select * from univevents");
while(rs.next())
param_start = rs.getString("start_date");
param_end = rs.getString("end_date");
param_disp_start = rs.getString("display_start");
param_disp_end =rs.getString("display_end");
param_shortdesc = rs.getString("short_desc");
param_longdesc = rs.getString("long_desc");
catch (Exception e)
//JOptionPane.showMessageDialogue("Exception: "+e.getMessage());
data.addElement(param_start);
data.addElement(param_end);
data.addElement(param_disp_start);
data.addElement(param_disp_end);
data.addElement(param_shortdesc);
data.addElement(param_longdesc);
table = new JTable(data, heading);
jsp = new JScrollPane(table,v,h);
//Add scrollpane to container
c.add("Center",jsp);
}//init
}//JApplet

Your data vector should be a Vector of Vectors.
I think you need to change your loop to look something like this:
while(rs.next())
    Vector row = new Vector();
    row.addElement( rs.getString("start_date") );
    row.addElement( rs.getString("end_date") );
    row.addElement( rs.getString("display_start") );
    row.addElement( rs.getString("display_end") );
    row.addElement( rs.getString("short_desc") );
    row.addElement( rs.getString("long_desc") );
    data.addElement( row );
} Then remove your data.addElement() statements found outside the loop.

JTable in ActiveX

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