Subheaders in JTable

hi,
I'm creating a table with four main column headers h1,h2,h3 and h4.
h2 has three subheadings h21,h22 and h23.Is there any way of creating subheadings under a main column header when creating a table using JTable.can any one help me out with this?
Thanx in advance...
Priya

Here's an example:
http://www.esus.com/docs/GetQuestionPage.jsp?uid=1272

Similar Messages

JTable : column header with subheaders

I need to create a table that looks like this:
======================
Car....|...PRICE......
.......|dollars.|euros
======================
camry..|18K.....|17k...
bmw....|80K.....|76K...
metro..|22K.....|30K...
(sorry for lousy "graphics")
My quesion is about the two-layered "PRICE" column header that has two subheaders for two different currencies.
What is the best way to approach this?

So there's no standard feature for that (like in HTML)-- you basically have to implement it all yourself?

Jtable:Is Nested header Possible

How to give nested header in java swing . I have defined the 4 main headers (type,source ,target ,default) wanted to have subheaders under each main header.
Example Code:
private String[] tableHeaders = new String[] {
               type,source ,target ,default};
private Vector<Vector<Object>> Vector = new Vector<Vector<Object>>();
private Vector<Object> headers = new Vector<Object>(
               Arrays.asList(tableHeaders));
private DefaultTableModel defaultTableModel = new DefaultTableModel(Vector,
               headers) {
          private static final long serialVersionUID = 1L;
          boolean[] columnEditables = new boolean[] { false, false, false, false };
          public boolean isCellEditable(int row, int column) {
               return columnEditables[column];
          public boolean isRowSelected(int row) {
               return true;
     };

I have worked on something similar. Here is one possible solution that you may want to try which is based on creating two tables - one main table and one inner table. Inner table is rendered as a column of the main table. You have to handle the table cell renderer and editor for the main table so that it can render inner table and allow normal table editing. I have added just one inner table in the code below but you can add more as per your requirement for showing them in other columns of the main table.
import java.awt.Component;
import javax.swing.AbstractCellEditor;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class NestedJTableHeader extends JFrame {
        private JTable mainTable;
        private JTable innerTable;
        private Object[][] tableList;
        private String[] columnNames = {"A", "B", "C", "D", "E"};
        private Object[][] data = {
                {"1", "2", "3", "4", new Boolean(false)},
                {"5", "6", "7", "8", new Boolean(true)},
                {"9", "10", "11", "12", new Boolean(false)},
                {"13", "14", "15", "16", new Boolean(true)},
                {"17", "18", "19", "20", new Boolean(false)}
        private String[] names = {"Type", "Source", "Target", "Default"};
        public NestedJTableHeader(){
            innerTable = new JTable(new DefaultTableModel (data, columnNames){
                    public Class<?> getColumnClass(int columnIndex) {
                         if(columnIndex==4)
                              return Boolean.class;
                         else
                              return super.getColumnClass(columnIndex);
            tableList = new Object[1][];
            tableList[0] = new Object[1];
            tableList[0][0] = innerTable;
            mainTable = new JTable(new DefaultTableModel(tableList, names));
            TableColumn tc = mainTable.getColumnModel().getColumn(0);
            tc.setCellRenderer(new CustomTableCellRenderer(innerTable));
            tc.setCellEditor(new CustomTableCellEditor(innerTable));
            tc = mainTable.getColumnModel().getColumn(1);
            mainTable.setRowHeight(innerTable.getPreferredSize().height+innerTable.getTableHeader().getPreferredSize().height+4);
            // Enable the ability to select a single cell
            mainTable.setColumnSelectionAllowed(true);
            mainTable.setRowSelectionAllowed(true);
            this.getContentPane().add(new JScrollPane(mainTable));
            this.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
            this.pack();
            setSize(600,450);
            setVisible(true);
        class CustomTableCellRenderer extends DefaultTableCellRenderer {
            JTable table;
            CustomTableCellRenderer(JTable table){
                this.table=table;
                this.table.setOpaque(true);
                this.table.setAlignmentY(JTable.LEFT_ALIGNMENT);
            @Override
            public Component getTableCellRendererComponent(JTable table, Object value,
                    boolean isSelected, boolean hasFocus, int row, int column) {
                this.table=(JTable)value;
                return new JScrollPane(this.table);
        class CustomTableCellEditor extends AbstractCellEditor implements TableCellEditor{
            JTable table;
            CustomTableCellEditor(JTable table){
                this.table=table;
                this.table.setOpaque(true);
                this.table.setAlignmentY(JTable.LEFT_ALIGNMENT);
            @Override
            public Component getTableCellEditorComponent(JTable table,
                    Object value, boolean isSelected, int row, int column) {
                this.table=(JTable)value;
                return new JScrollPane(this.table);
            @Override
            public Object getCellEditorValue() {
                return this.table;
         * @param args
        public static void main(String[] args) {
            new NestedJTableHeader();
} Edited by: Nitin Khare on May 17, 2012 12:42 AM

Grouping rows in jtable

Does anyone know of any examples anywhere of a way to group rows and create subtotal rows as well as total rows. In the table, I want to create a different look for the subtotal rows, possibly even with a different layout than the other rows.
For instance, My db has a list or orders for securities. I want to display in the table a row in the table for each row in the db with columns Security, quantity, and security description.
Then I want to break on security and show the total quantity for that security AND the total dividend. I also would like a group header that will display the security, so I dont have to display it on every line.
This seems like pretty basic application logic, but I cant find any examples anywhere of grouping and summing with subtotal and total headers and footers for JTable.

There is no built-in support for doing what you want. But keep in mind that the model is the heart of the JTable - do your grouping there and then notify the table when things changed. So you need a custom model that either shows or hides the subtotals (and the subheaders/footers as well). One approach would be to have a tableModel for each group and a master tableModel that' a combination of all the group table. Then let the master tableModel be the listener to the group tables (similar to the TableMap that comes with the jfc examples) update itself on showing/hiding the subtotals - and any other changes in the group table as well - and make it the model of the JTable.
Greetings
Jeanette

JTable Headers?

G'day all,
I am wondering if it is possible to do this, I have been through the tutorials, the API and a couple of textbooks and haven't found anything that addresses this particular problem.
What I want to do is set up kind of a multiple header for a JTable, such that it looks like this
| My Hours spent awake | My Hours spent Asleep | > main header
| Hours of Work | Hours of Volunteer | in bed | on the couch | > subheader
| Day | Night | Day | Night | day | night| Day | night | > subheader
| 1.5 | 6.5 | 3.0 | 1.5 | etc |etc | etc | etc | > data in the JTable
| etc | etc | etc | etc | | | | |
| | | | | | | | |
with a main header and subheaders and then the data in the table being set out in the column sizes of the last subheader. It is easy enough to set up a single row header, but can a multi row header be set up?
Thanks, learning lots thanks to your help!!!

Thanks DrClap,
That is absolutely perfect. Like I said, thanks to the help from people on this forum I am learning so much.
Are there any other good websites that have good examples of manipulating code in order to add functionality to an application. There are the basics that you learn from the tutorials and books and the simple examples they provide, but seeing examples like those above add a whole new level to learning.
Once again thanks.

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?
I'm now trying to add Print functionality, and I'm at a loss. What I want to do is have the user do the standard File->Print, which will print out the JTable on the currently selected inner frame. I can get a JTable to print using JTable.print(). What I can't do is find a way to get the JTable from the selected frame.
I can get the selected frame using desktop.getSelectedFrame(), but I'm at a loss as to what to do next. I've played around with .getComponent, but I'm not having any luck. the components returned don't seem to do me any good...for example, JViewPort?
Am I going about this the wrong way? Have I poorly designed this? Am I missing the obvious?
Thanks,
-Adam

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.
Another option is to extend the JInternalFrame class and insted using the add method to add a component you create get/setTable(...) methods. Then you can save the table as a class variable before adding it the scrollpane and adding the scrollpane to the internal frame.

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!!))
In the stocktickerserver GUI I'm using a JTable to display the details about stocks.
The user can select a stock and view the details of the stock in another frame. In one panel in the JFrame I've got a JTable listing the history items for the stock (Price, Change, Date).
Is it possible to color the rows of the JTable according to the value of the change column (or at least the value I insert there)?
e.g
if (change > 0){
Blue;
else{
if (change < 0){
Red;
else{
Green;
I'm completly ignorant on how to achieve this (or even if its possible at all) so all your ideas welcome.
Any help much appreciated
Pete
P.S.
The Stock History is a class that I store in a [private] Vector in the Stock Class.
For the selected Stock I loop through this vector getting the items (using various accessor methods)
I extract the values from the return StockHistory object and build a DefaultTableModel from these
Then I call JTable.setModel(theModel) to build the table

implement TableCellRenderer and change foreground of the Renderer in the method getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) . Install this renderer to your table.

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);
      frame.show();
class MyFrame extends JFrame{
public MyFrame(){
    setTitle("TableSelection");
    setSize(WIDTH,HEIGHT);
    DefaultTableModel myModel = new DefaultTableModel(2,2);
    JTable myTable = new JTable(myModel);
    myTable.setCellSelectionEnabled(true);
    JButton button00 = new JButton("select 0,0");
    button00.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent event){
     System.out.println("selection of cell (0,0)");
     //--- what code is required to select the cell(0,0)?
    JButton button11 = new JButton("select 1,1");
    button11.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent event){
     System.out.println("selection of cell (1,1)");
     //--- what code is required to select the cell(1,1)?
    Box myBox = new Box(BoxLayout.Y_AXIS);
    myBox.add(new JScrollPane(myTable));
    myBox.add(button00);
    myBox.add(button11);
    getContentPane().add(myBox, BorderLayout.CENTER);
private static final int WIDTH=200;
private static final int HEIGHT=200;
}Thanks a lot for your help.
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)
and the addRowSelectionInterval(int index1, int index2) method ~ http://java.sun.com/j2se/1.4/docs/api/javax/swing/JTable.html#addRowSelectionInterval(int,%20int)
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;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
public class TableDemo extends JPanel {
     private boolean DEBUG = false;
     public TableDemo() {
          super(new GridLayout(1, 0));
          ArrayList<MyObject> list = new ArrayList<MyObject>();
          list.add(new MyObject("Kathy", "Smith", "Snowboarding", new Integer(5),
                    new Boolean(false)));
          list.add(new MyObject("John", "Doe", "Rowing", new Integer(3),
                    new Boolean(true)));
          list.add(new MyObject("Sue", "Black", "Knitting", new Integer(2),
                    new Boolean(false)));
          list.add(new MyObject("Jane", "White", "Speed reading",
                    new Integer(20), new Boolean(true)));
          JTable table = new JTable(new MyTableModel(list));
          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 MyObject {
          String firstName;
          String lastName;
          String sport;
          int years;
          boolean isVeg;
          MyObject(String firstName, String lastName, String sport, int years,
                    boolean isVeg) {
               this.firstName = firstName;
               this.lastName = lastName;
               this.sport = sport;
               this.years = years;
               this.isVeg = isVeg;
     class MyTableModel extends AbstractTableModel {
          private String[] columnNames = { "First Name", "Last Name", "Sport",
                    "# of Years", "Vegetarian" };
          ArrayList<MyObject> list = null;
          MyTableModel(ArrayList<MyObject> list) {
               this.list = list;
          public int getColumnCount() {
               return columnNames.length;
          public int getRowCount() {
               return list.size();
          public String getColumnName(int col) {
               return columnNames[col];
          public Object getValueAt(int row, int col) {
               MyObject object = list.get(row);
               switch (col) {
               case 0:
                    return object.firstName;
               case 1:
                    return object.lastName;
               case 2:
                    return object.sport;
               case 3:
                    return object.years;
               case 4:
                    return object.isVeg;
               default:
                    return "unknown";
          public Class getColumnClass(int c) {
               return getValueAt(0, c).getClass();
      * 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();
}

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)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2851)
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

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.

Refresh data in a jtable when data changes

I have a jtable grdTable and a tableModel mytableModel which extend abstract table model
I have a jcheckbox in the column 1 which i want to uncheck all
I am doing the following.The data is changed ,I could see by doing susyem.out.println() but the data in the table does not refreshes.
public void showTablechanges()
TableModel tm = grdTable.getModel;
for(int i=0 ;i<grdTable.getRowCount();i++)
grdTable.setValueAt(Boolean.FALSE, i, 1);
( (MyTableModel)tm).fireTableDataChanged();
grdTable.repaint();
What am i missing or what wrong I am doing.How can i make the data refresh.
I tried do a sys out after seting the value and it is showing as false but the checkbox is still checked.I have tried a lot of things but I am not able to refresh the jtable.
Please please help.
Thanks

Thanks so much for the reply I read the links.I modified my code as
public void showTablechanges() {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
TableModel tm = grdTable.getModel;
for (int i = 0; i < grdTable.getRowCount(); i++) {
grdTable.setValueAt(Boolean.FALSE, i, 1);
((MyTableModel) tm).fireTableDataChanged();
grdTable.repaint();
This makes no difference.What strange thing is happening out of 12 checkboxes ,11 are unchecked but the first one always remains checked.EVen without the
invoke later 11 are unchecked and 1 remains checked
This method is in a panel and this panel is invoked from another MAin panel which has a changelistener for this panel.
i.e if the method above is in myPanel.java then in my main panel,I have
myPanel.addChangeListener(this)
Also if i remove the line
((MyTableModel) tm).fireTableDataChanged();
All checkboxes remains checked.
I am really confused and this looks very tough to me ,Can you find out what is wrong
Thanks,

Refresh jTable after inserting new data into the Database

Hey all,
I'm using Netbeans 6.5 to create a Desktop Application which is connected to a Java DB (Derby).
The first simple steps were all very successfull:
Create the jTable and bind it to the Database => everything works fine. When the application starts it correctly shows all data from the database.
The problem starts when I try to insert new data to the database.
For that reason I've created textfields and a button "Save". When I press the button it successfully inserts the data to the database but they are not displayed in the jTable (when the application starts they are all there, they are not updated at runtime) . I've tried table.invalidate() and table.repaint() but they just don't work.
Any help will be GREATLY appreciated. But please have in mind that most of the code is Netbeans-generated and most of it not editable.
Many thanks in advance.
George

Once again you are right my friend. I jumped to conclusion way too fast, when I shouldn't. (Give me a break, I've been busting my head with this well over a week). The response I saw when I did that was that indeed a line is added to the jTable. Because I falsly set the index of the object to be added to be second to last the row appeared on the table, what I didn't see at the time was that the last one disappeared. Hmm...
A new adventure begins...
So after a few hours of messing around with it here are my observations:
1) It was not an observable list. When I add the new element with employeesList.add(newEmp); , the table gets notified but a get a bunch of exceptions:
xception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 84, Size: 84
        at java.util.ArrayList.RangeCheck(ArrayList.java:546)
        at java.util.ArrayList.get(ArrayList.java:321)
        at org.jdesktop.swingbinding.impl.ListBindingManager$ColumnDescriptionManager.validateBinding(ListBindingManager.java:191)
        at org.jdesktop.swingbinding.impl.ListBindingManager.valueAt(ListBindingManager.java:99)
        at org.jdesktop.swingbinding.JTableBinding$BindingTableModel.getValueAt(JTableBinding.java:713)
        at javax.swing.JTable.getValueAt(JTable.java:1903)
        at javax.swing.JTable.prepareRenderer(JTable.java:3911)
        at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2072)
        at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1974)
        at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1897)
        at javax.swing.plaf.ComponentUI.update(ComponentUI.java:154)
        at javax.swing.JComponent.paintComponent(JComponent.java:743)
        at javax.swing.JComponent.paint(JComponent.java:1006)
        at javax.swing.JViewport.blitDoubleBuffered(JViewport.java:1602)
        at javax.swing.JViewport.windowBlitPaint(JViewport.java:1568)
        at javax.swing.JViewport.setViewPosition(JViewport.java:1098)
        at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.vsbStateChanged(BasicScrollPaneUI.java:818)
        at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.stateChanged(BasicScrollPaneUI.java:807)
        at javax.swing.DefaultBoundedRangeModel.fireStateChanged(DefaultBoundedRangeModel.java:348)
        at javax.swing.DefaultBoundedRangeModel.setRangeProperties(DefaultBoundedRangeModel.java:285)
        at javax.swing.DefaultBoundedRangeModel.setValue(DefaultBoundedRangeModel.java:151)
        at javax.swing.JScrollBar.setValue(JScrollBar.java:441)
        at javax.swing.plaf.basic.BasicScrollBarUI.scrollByUnits(BasicScrollBarUI.java:907)
        at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.mouseWheelMoved(BasicScrollPaneUI.java:778)
        at javax.swing.plaf.basic.BasicScrollPaneUI$MouseWheelHandler.mouseWheelMoved(BasicScrollPaneUI.java:449)
        at apple.laf.CUIAquaScrollPane$XYMouseWheelHandler.mouseWheelMoved(CUIAquaScrollPane.java:38)
        at java.awt.Component.processMouseWheelEvent(Component.java:5690)
        at java.awt.Component.processEvent(Component.java:5374)
        at java.awt.Container.processEvent(Container.java:2010)
        at java.awt.Component.dispatchEventImpl(Component.java:4068)
        at java.awt.Container.dispatchEventImpl(Container.java:2068)
        at java.awt.Component.dispatchMouseWheelToAncestor(Component.java:4211)
        at java.awt.Component.dispatchEventImpl(Component.java:3955)
        at java.awt.Container.dispatchEventImpl(Container.java:2068)
        at java.awt.Component.dispatchEvent(Component.java:3903)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3965)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866)
        at java.awt.Container.dispatchEventImpl(Container.java:2054)
        at java.awt.Window.dispatchEventImpl(Window.java:1801)
        at java.awt.Component.dispatchEvent(Component.java:3903)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 84, Size: 84
        at java.util.ArrayList.RangeCheck(ArrayList.java:546)
        at java.util.ArrayList.get(ArrayList.java:321)
        at org.jdesktop.swingbinding.impl.ListBindingManager$ColumnDescriptionManager.validateBinding(ListBindingManager.java:191)
        at org.jdesktop.swingbinding.impl.ListBindingManager.valueAt(ListBindingManager.java:99)
        at org.jdesktop.swingbinding.JTableBinding$BindingTableModel.getValueAt(JTableBinding.java:713)
        at javax.swing.JTable.getValueAt(JTable.java:1903)
        at javax.swing.JTable.prepareRenderer(JTable.java:3911)
        at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2072)
... and a lot morewhich from my poor understanding means that the jTable succesfully notices the change but it is not able (??) to adjust to the new change. What is more interesting is that when I plainly add the element to the end of the list (without an idex that is), a blank row appears at the end of my Table. The weird thing is that I've bound the table to some text fields below it, and when I select that empty row all the data appear correctly to the text fields.
I tried going through:
                org.jdesktop.observablecollections.ObservableCollections.observableList(employeesList).add(newEmp);as well as
                help = org.jdesktop.observablecollections.ObservableCollections.observableListHelper(employeesList);
                help.getObservableList().add(newEmp);
                help.fireElementChanged(employeesList.lastIndexOf(newEmp));and
                obsemployeesList = org.jdesktop.observablecollections.ObservableCollections.observableList(employeesList);
                obsemployeesList.add(newEmp);and I still get the same results (both the exeptions and the mysterious empty row at the end of the table
So, I'm again in terrible need of your advice. I can't thank you enough for the effort you put into this.
Best regards,
George
Edited by: tougeo on May 30, 2009 11:06 AM
Edited by: tougeo on May 30, 2009 11:21 AM
Edited by: tougeo on May 30, 2009 11:30 AM

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