Renderers for JTable

Can any one tell a good book for renderers..

I found that the Addison-Wessley set of Graphic Java books were quite useful - the Swing one's the one to look at here obviously.
A bit bland but quite "official".

Similar Messages

Mouse motion listener for JTable with JScrollpane

Hi All,
I have added mouse motion listener for JTable which is added in JScrollPane. But if i move the mouse, over the vertical/horizontal scroll bars, mouse motion listener doesn't works.
So it it required to add mousemotionlistener for JTable, JScrollPane, JScrollBar and etc.
Thanks in advance.
Regards,
Tamizhan

I am having one popup window which shows address information. This window contains JTable with JScrollPane and JButton components to show the details. While showing this information window, if the mouse cursor is over popupwindow, it should show the window otherwise it should hide the window after 30 seconds.
To achieve this, i have added mouse listener to JPanel, JTable, JButton and JScrollPane. so if the cursor is in any one of the component, it will not hide the window.
but for this i need to add listener to all the components in the JPanel. For JScrollPane i have to add horizontal, vertical and all the top corner buttons of Scroll bar.
Is this the only way to do this?

Help required for creating Row Renderer for JTable

Hi all,
I am trying to create customize row renderer for JTable.
My requirements are as below.
|-----------------|-------------------|------------------|------------------|-------|----------------|
|Category | Product ID |Description | Unit Price |Qty | Sub-Total |
|-----------------|-------------------|------------------|------------------|-------|----------------|
I have designed a combobox for category and product ID columns inside JTable. I want to put a listener on Category ID such that product IDs in selected categories will be visible in product ID drop down of selected row keeping other rows unchanged.
Column renderer is defining a class for entire column but by setting that im getting same values in all the rows for product IDs. And if I update values for one product ID dropdown, entire column data is changing.
Even im not able to put array of combobox for product ID column as number of rows are not fixed and increasing runtime.
Can anyone suggest me how can i customize Cells under particular column with JComboBox?
Regards,
Mahesh Kedari
Fidus Technologies Ltd.
Edited by: m1JustM1 on Feb 8, 2010 4:48 AM

Start by reading [this |http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#editrender] tutorial. If you still have questions afterward, feel free to post an SSCCE .

Implementing a Property renderers for km Property groups

Hi Gurus!,
I would like to write a portal application which groups the properties belonging
a PropertyGroup by the means of GridLayout. while looking for samples i came
accross a tutorial ("Writing customer renderers for km Property groups"). The problem is following. The code is not complete. I would be thankfull if someone
sends me a working code which Implements GroupRenderer class.
Best regards

Hi,
thank you for your response. I've already read this tutorial but it is not complete.
That why I need a whole Project implementing a Property Renderer. Another problem is i don't know which kind of project in NWDS I have to choose.
I would be thankfull if you sent me a step by step tutorial regarding this topic
Thanks
best regrads

GetSelectedRow( ) for JTable is returning a value of -1?

getSelectedRow( ) for JTable is returning a value of -1?
May I know what is the reason for this and what we can do to rectify it.

I am selecting a row on the GUI side, but this method is returning -1. Post a SSCCE that demonstrates this.
db

Making some Custom Column Renderers for a JTable

Hello People
I've been playing around with a JTable by following the tutorial "How to Use Tables". (I am using netBeans 4.1 to "sculpt" my swing objects onto the nice palette in the IDE. I don't know if this has anything to do with the errors but, it seems like netBeans requires some Gui components be initialized via this abovementioned "palette")
I believe that I need to somehow tell the JTable about what kinds of objects are in it so that it can render itself properly. I have a table set up with some default values in it
->Strings both Editable and Not-Editable
-> Integers both Editable and Not-Editable
-> Boolean rendered as a check box Editable
So upon startup, my progarm renders the table correctly. I have a button to clear all of the elements in the table, which works fine. It is only when I switch to another window, then switch back to an empty table ... the JTable needs to redraw itself. This is when I'm getting the error:
java.lang.NullPointerException
        at ElementHelp.PrimitiveManager$MyVectorTableModel.getColumnClass(PrimitiveManager.java:93)
        at javax.swing.JTable.getColumnClass(JTable.java:1752)
        at javax.swing.JTable.getCellRenderer(JTable.java:3700)
        at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:1148)
        at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1051)
        at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:974)
        at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)
        at javax.swing.JComponent.paintComponent(JComponent.java:541)
        at javax.swing.JComponent.paint(JComponent.java:808)
...blah blah more exception stack.....
       I think that because there are no elements in the table that the call to "getClass" for an element in the table returns a NullPointerException. I think I can avoid this via telling the JTable about the types of objects each column will contain. The tutorial suggests one of two solutions: (neither of which I can get to work)
1) Use a class that extends the DefaultTableCellRenderer
2) I should write somthing that ...extends JLabel and implements TableCellRenderer.... such as the tutorials ColorRenderer example. Which solution should I work out if I want my table to add/delete rows and be able to have a few cells edited. (It will never be restructured .. the column types won't change)
Also, I've created my own TableModel for it ... a class that extends AbstractTableModel ... (although not declaired, it also implemnts/overwrites functions from the TableModel interface)
Any suggestions on avoiding the abovementioned error?
thanks and happy holidays to everyone

I think that because there are no elements in the table that the call to "getClass" for an element in the table returns a NullPointerExceptionWell, if you have no data in the table then your TableModel should be returning "0" for the number of rows in the table and it won't be a problem.
Also, I've created my own TableModel for it ... Why? Use the DefaultTableModel it supports String, Integers and Booleans without any need for custom coding.

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();
}

How to create complecated Header for JTable in a JApplet ?

I have one JTable in a JApplet.
I need to create a complecated header for the table. For that I have used a downloaded code in the URL http://www2.gol.com/users/tame/swing/examples/JTableExamples1.html (First example).
Instead of "GroupableHeaderExample.java", I have used my code "StatusReportPopupMenu.java".
The program runs properly in appletviewer. But, when I try to open the same in IE 5.5, first it shows the message "Loading Java Applet" . Then it goes blank. The status bar shows the message: Start: applet not initialized". At the Java console of the browser, I could see the Exception as given below:
java.lang.NullPointerException
     at GroupableTableHeaderUI.getHeaderHeight(GroupableTableHeaderUI.java:97)
     at GroupableTableHeaderUI.createHeaderSize(GroupableTableHeaderUI.java:118)
     at GroupableTableHeaderUI.getPreferredSize(GroupableTableHeaderUI.java:128)
     at javax.swing.JComponent.getPreferredSize(Unknown Source)
     at javax.swing.ViewportLayout.preferredLayoutSize(Unknown Source)
     at java.awt.Container.preferredSize(Unknown Source)
     at java.awt.Container.getPreferredSize(Unknown Source)
     at javax.swing.JComponent.getPreferredSize(Unknown Source)
     at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)
     at java.awt.Container.layout(Unknown Source)
     at java.awt.Container.doLayout(Unknown Source)
     at java.awt.Container.validateTree(Unknown Source)
     at java.awt.Container.validateTree(Unknown Source)
     at java.awt.Container.validateTree(Unknown Source)
     at java.awt.Container.validateTree(Unknown Source)
     at java.awt.Container.validateTree(Unknown Source)
     at java.awt.Container.validateTree(Unknown Source)
     at java.awt.Container.validate(Unknown Source)
     at sun.plugin.AppletViewer$AppletEventListener.appletStateChanged(Unknown Source)
     at sun.applet.AppletPanel.dispatchAppletEvent(Unknown Source)
     at sun.applet.AppletPanel.appletResize(Unknown Source)
     at java.applet.Applet.resize(Unknown Source)
     at java.applet.Applet.resize(Unknown Source)
     at java.awt.Component.setSize(Unknown Source)
     at sun.plugin.AppletViewer$AppletEventListener.appletStateChanged(Unknown Source)
     at sun.applet.AppletPanel.dispatchAppletEvent(Unknown Source)
     at sun.applet.AppletPanel.appletResize(Unknown Source)
     at java.applet.Applet.resize(Unknown Source)
     at java.awt.Component.setSize(Unknown Source)
     at StatusReportPopupMenu.init(StatusReportPopupMenu.java:245)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
I'm not able to figureout what should I do to correct the problem.
Please help. This is very urgent.

Hi,
1. For this we have to use the
authorisation object
P_ORGIN
2. It has got the following fields, on which authorisations can be controlled.
AUTHC Authorization level
INFTY Infotype
PERSA Personnel Area
PERSG Employee Group
PERSK Employee Subgroup
SUBTY Subtype
VDSK1 Organizational Key
Regards,
Harish

Creating a model for jTable in JDeveloper..

Hi everybody,
I have a little problem about making a model for my jTable.
Previously i've been using Netbeans and i had no problem about table models.
Object[][] data={{" "," "," "," "}};
String[] columnNames = {"Pers_no","Name","Surname","Position"};
model = new javax.swing.table.DefaultTableModel(data, columnNames);
jTable1.setModel(model);
I've been using this code sample to generate model.but this code doesn't work in JDeveloper.
Indeed it gives no error but when i execute there appears no column name in my jTable.
Has anyone got idea how can i generate table model??
Or why this code doesn't work?
Please give me some sample code that works in JDeveloper...
Thank you.
Onur

Onur,
Oracle JDeveloper also has a technologies known a JClient that handles the binding for you. Not sure if your requirement is to handle table models yourself, but if it is for database data retrieval then JClient is more efficient.
Frank

Must click then click and drag for JTable Drag and Drop

Hi All,
I've been using Java 1.4 to drag and drop data between two tables in our application. Basically I need to drag the data from individual rows of the source table and insert it into one of the cells in the new table. This works absolutely fine and has made a huge improvement to this portion of our app. I've included example source code below that does a similar thing by transferring data from one table and inserting it into another (it's quite big and also not as well done as the example in our real app but unfortunately I can't send the source for that).
The thing I've noticed though is that in order to start dragging data I need to click to select it and then press and hold the mouse button to start dragging, whereas under W**dows and just about every other OS you can just press and hold and start dragging straight away. If you try this with a JTable though it just changes the rows you have selected so the drag and drop works but feels a bit clunky and amateurish. I'd like to do something about this such that it works like Windows Explorer (or similar) where you can just press the mouse button and start dragging.
Any help would be greatly appreciated - and if anybody finds the code useful you're more than welcome to it. Note that the business end of this is CustomTransferHandler.java - this will show you how to insert data at a specific position in a JTable, it's a bit of a faff but not too bad once you've got it sussed.
Thanks,
Bart Read
===============================================================
TestFrame.java
* TestFrame.java
* Created on October 21, 2002, 4:59 PM
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.util.TooManyListenersException;
import javax.swing.*;
* @author readb
public class TestFrame extends javax.swing.JFrame
 private static final String [] NAMES = {
 "John", "Geoff", "Madeleine", "Maria", "Flanders",
 "Homer", "Marge", "Bart", "Lisa", "Weird Baby" };
 private JTable source;
 private JTable dest;
 private MyTableModel sourceModel;
 private MyTableModel destModel;
 private Clipboard clipboard;
 /** Creates a new instance of TestFrame */
 public TestFrame()
 clipboard = getToolkit().getSystemClipboard();
 Container c = getContentPane();
 c.setLayout( new BorderLayout( 40, 40 ) );
 source = new MyJTable();
 sourceModel = new MyTableModel();
 source.setModel( sourceModel );
 source.setDragEnabled( true );
 CustomTransferHandler handler = new CustomTransferHandler( "Source handler" );
 source.setTransferHandler( handler );
 try
 source.getDropTarget().addDropTargetListener( handler );
 catch ( TooManyListenersException tmle )
 tmle.printStackTrace();
 dest = new MyJTable();
 destModel = new MyTableModel();
 dest.setModel( destModel );
 dest.setDragEnabled( true );
 handler = new CustomTransferHandler( "Dest handler" );
 dest.setTransferHandler( handler );
 try
 dest.getDropTarget().addDropTargetListener( handler );
 catch ( TooManyListenersException tmle )
 tmle.printStackTrace();
 c.add( new JScrollPane( source ), BorderLayout.WEST );
 c.add( new JScrollPane( dest ), BorderLayout.EAST );
 populate();
 private void populate( MyTableModel model )
 for ( int index = 0; index < NAMES.length; ++index )
 model.setRow( index, new DataRow( index + 1, NAMES[ index ] ) );
 private void populate()
 populate( sourceModel );
 populate( destModel );
 public static void main( String [] args )
 TestFrame app = new TestFrame();
 app.addWindowListener(
 new WindowAdapter() {
 public void windowClosing( WindowEvent we )
 System.exit( 0 );
 app.pack();
 app.setSize( 1000, 600 );
 app.show();
 private class MyJTable extends JTable
 public boolean getScrollableTracksViewportHeight()
 Component parent = getParent();
 if (parent instanceof JViewport)
 return parent.getHeight() > getPreferredSize().height;
 return false;
}=====================================================================
MyTableModel.java
* MyTableModel.java
* Created on October 21, 2002, 4:43 PM
import java.util.ArrayList;
* @author readb
public class MyTableModel extends javax.swing.table.AbstractTableModel
 private static final int NUMBER = 0;
 private static final int NAME = 1;
 private static final String [] COLUMN_HEADINGS = { "Number", "Name" };
 private ArrayList data;
 /** Creates a new instance of MyTableModel */
 public MyTableModel()
 super();
 data = new ArrayList();
 public int getColumnCount()
 return COLUMN_HEADINGS.length;
 public String getColumnName( int index )
 return COLUMN_HEADINGS[ index ];
 public Class getColumnClass( int index )
 switch ( index )
 case NUMBER:
 return Integer.class;
 case NAME:
 return String.class;
 default:
 throw new IllegalArgumentException( "Illegal column index: " + index );
 public int getRowCount()
 return ( null == data ? 0 : data.size() );
 public Object getValueAt( int row, int column )
 DataRow dataRow = ( DataRow ) data.get( row );
 switch ( column )
 case NUMBER:
 return new Integer( dataRow.getNumber() );
 case NAME:
 return dataRow.getName();
 default:
 throw new IllegalArgumentException( "Illegal column index: " + column );
 public void addRow( DataRow row )
 int rowIndex = data.size();
 data.add( row );
 fireTableRowsInserted( rowIndex, rowIndex );
 public void addRows( DataRow [] rows )
 int firstRow = data.size();
 for ( int index = 0; index < rows.length; ++index )
 data.add( rows[ index ] );
 fireTableRowsInserted( firstRow, data.size() - 1 );
 public void setRow( int index, DataRow row )
 if ( index == data.size() )
 data.add( row );
 else
 data.set( index, row );
 fireTableRowsUpdated( index, index );
 public void insertRows( int index, DataRow [] rows )
 for ( int rowIndex = rows.length - 1; rowIndex >= 0; --rowIndex )
 data.add( index, rows[ rowIndex ] );
 fireTableRowsInserted( index, index + rows.length - 1 );
 public DataRow getRow( int index )
 return ( DataRow ) data.get( index );
 public DataRow removeRow( int index )
 DataRow retVal = ( DataRow ) data.remove( index );
 fireTableRowsDeleted( index, index );
 return retVal;
 public boolean removeRow( DataRow row )
 int index = data.indexOf( row );
 boolean retVal = data.remove( row );
 fireTableRowsDeleted( index, index );
 return retVal;
 public void removeRows( DataRow [] rows )
 for ( int index = 0; index < rows.length; ++index )
 data.remove( rows[ index ] );
 fireTableDataChanged();
}=====================================================================
DataRow.java
* DataRow.java
* Created on October 21, 2002, 4:41 PM
import java.io.Serializable;
* @author readb
public class DataRow implements Serializable
 private int number;
 private String name;
 /** Creates a new instance of DataRow */
 public DataRow( int number, String name )
 this.number = number;
 this.name = name;
 public int getNumber()
 return number;
 public String getName()
 return name;
 public String toString()
 return String.valueOf( number ) + ": " + name;
}======================================================================
CustomTransferHandler.java
* CustomTransferHandler.java
* Created on October 22, 2002, 8:36 AM
import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.*;
import java.awt.event.InputEvent;
import java.io.IOException;
import java.util.Arrays;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.TransferHandler;
* @author readb
public class CustomTransferHandler
 extends TransferHandler
 implements Transferable, ClipboardOwner, DropTargetListener
 public static final DataFlavor ROW_ARRAY_FLAVOR = new DataFlavor( DataRow[].class, "Multiple rows of data" );
 private String name;
 private ImageIcon myIcon;
 private DataRow [] data;
 private boolean clipboardOwner = false;
 private int rowIndex = -1;
 /** Creates a new instance of CustomTransferHandler */
 public CustomTransferHandler( String name )
 this.name = name;
 public boolean canImport( JComponent comp, DataFlavor [] transferFlavors )
 System.err.println( "CustomTransferHandler::canImport" );
 if ( comp instanceof JTable && ( ( JTable ) comp ).getModel() instanceof MyTableModel )
 for ( int index = 0; index < transferFlavors.length; ++index )
 if ( ! transferFlavors[ index ].equals( ROW_ARRAY_FLAVOR ) )
 return false;
 return true;
 else
 return false;
 protected Transferable createTransferable( JComponent c )
 System.err.println( "CustomTransferHandler::createTransferable" );
 if ( ! ( c instanceof JTable ) || ! ( ( ( JTable ) c ).getModel() instanceof MyTableModel ) )
 return null;
 this.data = null;
 JTable table = ( JTable ) c;
 MyTableModel model = ( MyTableModel ) table.getModel();
 Clipboard cb = table.getToolkit().getSystemClipboard();
 cb.setContents( this, this );
 clipboardOwner = true;
 int [] selectedRows = table.getSelectedRows();
 Arrays.sort( selectedRows );
 data = new DataRow[ selectedRows.length ];
 for ( int index = 0; index < data.length; ++index )
 data[ index ] = model.getRow( selectedRows[ index ] );
 return this;
 public void exportAsDrag( JComponent comp, InputEvent e, int action )
 super.exportAsDrag( comp, e, action );
 Clipboard cb = comp.getToolkit().getSystemClipboard();
 cb.setContents( this, this );
 protected void exportDone( JComponent source, Transferable data, int action )
 System.err.println( "CustomTransferHandler::exportDone" );
 if ( TransferHandler.MOVE == action && source instanceof JTable && ( ( JTable ) source ).getModel() instanceof MyTableModel )
 JTable table = ( JTable ) source;
 MyTableModel model = ( MyTableModel ) table.getModel();
 int [] selected = table.getSelectedRows();
 for ( int index = selected.length - 1; index >= 0; --index )
 model.removeRow( selected[ index ] );
 public void exportToClipboard( JComponent comp, Clipboard clip, int action )
 System.err.println( "CustomTransferHandler::exportToClipboard" );
 public int getSourceActions( JComponent c )
 System.err.println( "CustomTransferHandler::getSourceActions" );
 if ( ( c instanceof JTable ) && ( ( JTable ) c ).getModel() instanceof MyTableModel )
 return MOVE;
 else
 return NONE;
 * I've commented this out because it doesn't appear to work in any case.
 * The image isn't null but as far as I can tell this method is never
 * invoked.
// public Icon getVisualRepresentation( Transferable t )
// System.err.println( "CustomTransferHandler::getVisualRepresentation" );
// if ( t instanceof CustomTransferHandler )
// if ( null == myIcon )
// try
// myIcon = new ImageIcon( getClass().getClassLoader().getResource( "dragimage.gif" ) );
// catch ( Exception e )
// System.err.println( "CustomTransferHandler::getVisualRepresentation: exception loading image" );
// e.printStackTrace();
// if ( null == myIcon )
// System.err.println( "CustomTransferHandler::getVisualRepresentation: myIcon is still NULL" );
// return myIcon;
// else
// return null;
 public boolean importData( JComponent comp, Transferable t )
 System.err.println( "CustomTransferHandler::importData" );
 super.importData( comp, t );
 if ( ! ( comp instanceof JTable ) )
 return false;
 if ( ! ( ( ( JTable ) comp ).getModel() instanceof MyTableModel ) )
 return false;
 if ( clipboardOwner )
 return false;
 if ( !t.isDataFlavorSupported( ROW_ARRAY_FLAVOR ) )
 return false;
 try
 data = ( DataRow [] ) t.getTransferData( ROW_ARRAY_FLAVOR );
 return true;
 catch ( IOException ioe )
 data = null;
 return false;
 catch ( UnsupportedFlavorException ufe )
 data = null;
 return false;
 public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException
 System.err.println( "MyTransferable::getTransferData" );
 if ( flavor.equals( ROW_ARRAY_FLAVOR ) )
 return data;
 else
 throw new UnsupportedFlavorException( flavor );
 public DataFlavor[] getTransferDataFlavors()
 System.err.println( "MyTransferable::getTransferDataFlavors" );
 DataFlavor [] flavors = new DataFlavor[ 1 ];
 flavors[ 0 ] = ROW_ARRAY_FLAVOR;
 return flavors;
 public boolean isDataFlavorSupported( DataFlavor flavor )
 System.err.println( "MyTransferable::isDataFlavorSupported" );
 return flavor.equals( ROW_ARRAY_FLAVOR );
 public void lostOwnership( Clipboard clipboard, Transferable transferable )
 clipboardOwner = false;
 /** Called while a drag operation is ongoing, when the mouse pointer enters
 * the operable part of the drop site for the <code>DropTarget</code>
 * registered with this listener.
 * @param dtde the <code>DropTargetDragEvent</code>
 public void dragEnter(DropTargetDragEvent dtde)
 /** Called while a drag operation is ongoing, when the mouse pointer has
 * exited the operable part of the drop site for the
 * <code>DropTarget</code> registered with this listener.
 * @param dte the <code>DropTargetEvent</code>
 public void dragExit(DropTargetEvent dte)
 /** Called when a drag operation is ongoing, while the mouse pointer is still
 * over the operable part of the drop site for the <code>DropTarget</code>
 * registered with this listener.
 * @param dtde the <code>DropTargetDragEvent</code>
 public void dragOver(DropTargetDragEvent dtde)
 /** Called when the drag operation has terminated with a drop on
 * the operable part of the drop site for the <code>DropTarget</code>
 * registered with this listener.
 * 
 * This method is responsible for undertaking
 * the transfer of the data associated with the
 * gesture. The <code>DropTargetDropEvent</code>
 * provides a means to obtain a <code>Transferable</code>
 * object that represents the data object(s) to
 * be transfered.
 * From this method, the <code>DropTargetListener</code>
 * shall accept or reject the drop via the
 * acceptDrop(int dropAction) or rejectDrop() methods of the
 * <code>DropTargetDropEvent</code> parameter.
 * 
 * Subsequent to acceptDrop(), but not before,
 * <code>DropTargetDropEvent</code>'s getTransferable()
 * method may be invoked, and data transfer may be
 * performed via the returned <code>Transferable</code>'s
 * getTransferData() method.
 * 
 * At the completion of a drop, an implementation
 * of this method is required to signal the success/failure
 * of the drop by passing an appropriate
 * <code>boolean</code> to the <code>DropTargetDropEvent</code>'s
 * dropComplete(boolean success) method.
 * 
 * Note: The data transfer should be completed before the call to the
 * <code>DropTargetDropEvent</code>'s dropComplete(boolean success) method.
 * After that, a call to the getTransferData() method of the
 * <code>Transferable</code> returned by
 * <code>DropTargetDropEvent.getTransferable()</code> is guaranteed to
 * succeed only if the data transfer is local; that is, only if
 * <code>DropTargetDropEvent.isLocalTransfer()</code> returns
 * <code>true</code>. Otherwise, the behavior of the call is
 * implementation-dependent.
 * 
 * @param dtde the <code>DropTargetDropEvent</code>
 public void drop(DropTargetDropEvent dtde)
 System.err.println( "CustomTransferHandler::drop" );
 Component c = dtde.getDropTargetContext().getDropTarget().getComponent();
 if ( ! ( c instanceof JComponent ) )
 dtde.rejectDrop();
 return;
 JComponent comp = ( JComponent ) c;
 if ( ! ( c instanceof JTable ) || ! ( ( ( JTable ) c ).getModel() instanceof MyTableModel ) )
 dtde.rejectDrop();
 return;
 dtde.acceptDrop( TransferHandler.MOVE );
 // THIS is such a mess -- you can't do the following because
 // getTransferable() throws an (undocumented) exception - what's that
 // all about.
// Transferable t = dtde.getTransferable();
// if ( !t.isDataFlavourSupported( ROW_ARRAY_FLAVOR ) )
// dtde.rejectDrop();
// return false;
// TransferHandler handler = comp.getTransferHandler();
// if ( null == handler || ! handler.importData( comp, t ) )
// dtde.rejectDrop();
// return;
 Point p = dtde.getLocation();
 JTable table = ( JTable ) comp;
 rowIndex = table.rowAtPoint( p );
 // So you have to do this instead and use the data that's been
 // stored in the data member via import data. Total mess.
 if ( null == data )
 dtde.rejectDrop();
 return;
 MyTableModel model = ( MyTableModel ) table.getModel();
 if ( rowIndex == -1 )
 model.addRows( data );
 else
 model.insertRows( rowIndex, data );
 dtde.acceptDrop( TransferHandler.MOVE );
 /** Called if the user has modified
 * the current drop gesture.
 * 
 * @param dtde the <code>DropTargetDragEvent</code>
 public void dropActionChanged(DropTargetDragEvent dtde)
}

Hi again,
Well I've tried using the MouseListener / MouseMotionListener approach but it doesn't quite seem to work, although it does get the events correctly. I think the reason is that it doesn't interact correctly with the Java DnD machinery which is something that V.V hinted at. It's something that I may need to look into if / when I have more time available.
I have to say though that I haven't had any problems with scrollbars - we're making fairly heavy use of large tables and if you drag over a table with a scroll bar and move to the top or bottom then it scrolls as you would expect and allows you to drop the data where you like. For this situation I've used pretty much the same approach as for the toy example above except that I've implemented separate source and destination TransferHandlers (the source table is read-only, and it really doesn't make sense to allow people to drag from the destination table so I've essentially split the functionality of the example handler down the middle).
I'm not actually particularly in favour of messing too much with the mechanics of DnD, more because of lack of time than anything else. Guess I'll just have to put up with this for the moment. Doesn't help that DnD is so poorly documented by Sun.
Thanks for all your help.
Bart

Custom column headers for JTable in JScrollPane

I want a heirachical header structure on a scrolled JTable. I've successfully generated a second JTableHeader which moves it's tabs with the normal header. If I add the secondary JTableHeader into the container above the whole scroll pane it's does almost what I want, but it's not quite correctly aligned.
What I want to do is to put both the automaticaly generated JTableHeader and my extra one into the JScrollPane's column header area.
I wrapped the two headers together into a vertical Box and tried calling the setColumnHeaderView() on the scrollpane, and then creating a JViewport and using setColumnHeader(). Niether seems to have any effect. The basic table header obstinately remains unaltered.
There seems to be some special processing going on when JTable and JScrollPane get together, but I can't understand how replacing the column header viewport can be ineffective.

Thanks. I think I've just cracked it more thoroughly, though. [I found this bug report|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5032464]. This has guided me to a work-around that seems stable so far. I'm using an extended JTable class anyway (mostly to do with table header width behaviour). I've added a field to my own table class and the following override:
The trick is to work out where the dirty deed is done, having search all the scroll pane related classes for special casing JTable.
public class STable extends JTable {
    @Override
    protected void configureEnclosingScrollPane() {
        if (secondaryHeader == null) {
            super.configureEnclosingScrollPane();
        } else {
            Container p = getParent();
            if (p instanceof JViewport) {
                Container gp = p.getParent();
                if (gp instanceof JScrollPane) {
                    JScrollPane scrollPane = (JScrollPane) gp;
                    // Make certain we are the viewPort's view and not, for
                    // example, the rowHeaderView of the scrollPane -
                    // an implementor of fixed columns might do this.
                    JViewport viewport = scrollPane.getViewport();
                    if (viewport == null || viewport.getView() != this) {
                        return;
                    JPanel hdrs = new JPanel();
                    hdrs.setLayout(new BorderLayout());
                    hdrs.add(secondaryHeader.getHeader(), BorderLayout.NORTH);
                    hdrs.add(getTableHeader(), BorderLayout.SOUTH);
                    scrollPane.setColumnHeaderView(hdrs);
                    // scrollPane.getViewport().setBackingStoreEnabled(true);
                    Border border = scrollPane.getBorder();
                    if (border == null || border instanceof UIResource) {
                        Border scrollPaneBorder =
                                UIManager.getBorder("Table.scrollPaneBorder");
                        if (scrollPaneBorder != null) {
                            scrollPane.setBorder(scrollPaneBorder);
    }I'm hopeful that will prevent the column header view from being overwritten by later layout operations.

MouseListener for JTable cells using html

Hello,
I'm trying to write a MouseListener that determines whether the cursor is positioned over a certain string within a JTable cell. The cell contains an html string to allow for some formatting.
For instance, the table data for a certain cell could be "<html>SomeBoldTextmoreText<html>". I would like to detect when a mouse click occurs on the bold text.
My current solution is to create the glyph vector corresponding to the cell content stripped of all html tags and then check if the cursor position is within one of the glyphs that form the string. However, that obviously doesn't take into account the formatting done by html, so its not working very well.
Any suggestions?

the only way you could possibly do this, if you used JEditorPane as a renderer. even then i'm not sure.

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

Hello all, first time poster and relative newbie to java.
I am trying to learn java and in the process have stumbled upon this issue.
I have searched through the forum as well as googled my way around for answers. And though I am more informed than I was, I still am a little stumped.
I would like to implement a table that pulls data from a database (mysql), limits the results, and include prev/next buttons to traverse through the records.
I think this involves writing my own AbstractTableModel. And I have seen some examples as such. But could use a little more help.
I will always be pulling 10 rows, but the columns will change depending on query I am using so implementing a more generic set of methods would be great.. To be specific...
Table: users
Columns: userid, ufname, ulname, utype, ustatus, etc....
For selection purposes I only need to show: userid, ufname, ulname. So I figure I write a query like:
select userid, ulname, ufname from users limit index, 10
Where index tells the query where to start from then use the results to populate the jtable. I can do this statically but do not quite understand how to implement the next/prev buttons so that the table pulls the next or previous set of data.
If this can happen without the need to repaint/refresh the frame that would be great.
sudo code (with comments) would be ok, but a basic working example of this would be even better.
thank you in advance, if more information is required please let me know.

tumbleweeds roll by...........

How to set a cell editable at runtime for jtable

Hi evry body
i need to set a cell as editable during runtime and set some value for the cell and make it non editable after setting value
how can i do it? urgent help appreciated
regards
anil

You could override the methods isCellEditable(...) and setValueAt(...) in your JTable's TableModel to get the effect desired
// Assuming that each element of the array will be false initially
boolean[][] valueSet = new boolean[noRows][noCols];
public boolean isCellEditable(int row, int col) {
return !valueSet[row][col];
public void setValueAt(Object obj, int row, int col) {
super.setValueAt(obj, row, col);
valueSet[row][col] = true;
}

Listener for JTable

hi all
i'm using JTable for displaying data retrieved from database. I need to count the no of rows dynamically. ie whenever a row is added/deleted to JTable the rowcounter should be in/decremented. is there any event to do this

You need to add a table model listener to the JTable. Within the table model listener you can get an event when a row is inserted, deleted or updated,
Cheers
Marco
User Interface Blog
http://www.user-interface.org

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