JTable and last cell edited

Hi all,
I have a jtable that is populated from an sql table.
When I edit the cells, I push on a botton that updates the table.
The problem I am facing is in the last cell edited, I need to click on another cell for me to be able to read its new value. i.e. in another word the cell needs to loose focus for me to be able to read is new values.
Thanks in advance for your help.
Best regards.
Saadi MONLA

Seems like a bug in JTable. Best solution is probably when the routine that feeds the new values into the JTable is completed, force a focus on a different cell and then back to your cell using an API method. If an API method doesn't exist to force focus to another cell (I just looked and didn't see one) then maybe executing a repaint() or something like that will cause it to redraw correctly.

Similar Messages

JTable using TableModels: Cell edit committed on press of a button

Hi,
I went through the forum posts related to JTable but was unfortunate not to find anything that resembled my query.
Here is where i am at:::
I have a JTable which is backed by my TableModel. The table model is populated with data from a database table.
The data is clearly displayed, the cells are editable, i have a TableModelListener( ) listening to any changes made to the table. So if i were to click on a cell and change the value, i see that the modelListener gets called.
Here is where i am stuck:::
I have two buttons on the same panel, which are say "Commit Changes" and "Do not commit changes"
I would like the changes made to the cell(s) committed ONLY on the correct button being pressed, and the changes rolledback if the other is pressed.
This whole thing is being done using MVC architecture, so i have my own actions that are passed to the button, which in turn calls a model to update the db. BUT i cant seem to link the cell being edited and the buttons
any ideas, suggestions, a finger pointed to a direction...
thank you,
-U

See:
http://developer.java.sun.com/developer/bugParade/bugs/4651820.html
http://developer.java.sun.com/developer/bugParade/bugs/4274963.html
Sven

Cell Editing

Is there a way to turn on and off cell editable property in a JTable?

Override the isCellEditable(...) method of JTable to return false.

JTable display cell previous/last selected/edited/clicked value/JComponent

I have a problem with the minesweeper I made,
The game board is a JTable containing custom gadgets in the cells,
The first game goes without problem, but I press the JButton starting a new game,
I randomly refill the JTable with new custom gadgets,
My problem is that the last cell I clicked in the JTable is still in the clicked state with the previous value and I cannot click or see the new custom gadget that ought to be there ...
The custom gadgets extends JLabel and use custom AbstractCellEditor and custom TableCellRenderer, but I think it is not related to my custom gadgets,
I work on OSX,
Any hint to my problem's origin?
Any solutions?

My code included not related classes I eliminated to use only standard java classes,
here is is the minimal code for my mine sweeper reproducing the problem on the third launch
any hint? :
import java.awt.Container;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
public class MyMineSweeper
   private class JTableCellRenderer implements javax.swing.table.TableCellRenderer
      private javax.swing.table.TableCellRenderer defaultRenderer;
      public JTableCellRenderer(javax.swing.table.TableCellRenderer aRenderer)
         defaultRenderer = aRenderer;
      public java.awt.Component getTableCellRendererComponent(javax.swing.JTable aTable, Object anElement, boolean isSelected, boolean hasFocus, int aRow, int aColumn)
         if(anElement instanceof javax.swing.JComponent)
            return (javax.swing.JComponent)anElement;
         return defaultRenderer.getTableCellRendererComponent(aTable, anElement, isSelected, hasFocus, aRow, aColumn);
   private class JTableCellEditor extends javax.swing.AbstractCellEditor implements javax.swing.table.TableCellEditor
      private javax.swing.JComponent component;
      private int theClickCountToStart = 0;
      public java.awt.Component getTableCellEditorComponent(javax.swing.JTable aTable, Object anElement, boolean isSelected, int aRow, int aColumn)
         component = (javax.swing.JComponent) anElement;
         return component;
      public Object getCellEditorValue()
         return component;
      public boolean isCellEditable(java.util.EventObject anEvent)
         if(anEvent instanceof java.awt.event.MouseEvent)
            return ((java.awt.event.MouseEvent)anEvent).getClickCount() >= theClickCountToStart;
         return true;
      public int getClickCountToStart()
         return theClickCountToStart;
      public void setClickCountToStart(int aClickCountToStart)
         theClickCountToStart = aClickCountToStart;
   private class Tile extends javax.swing.JLabel
      public class JTileMouseListener implements java.awt.event.MouseListener
         public void mouseClicked(MouseEvent e)
            if(isRevealed()==false)
               reveal();
         public void mousePressed(MouseEvent e)
         public void mouseReleased(MouseEvent e)
         public void mouseEntered(MouseEvent e)
         public void mouseExited(MouseEvent e)
        public void reveal(int aY, int anX)
           Tile tile = ((Tile)theMapModel.getValueAt(aY, anX));
           if(tile.isRevealed()==false)
              tile.reveal();
        public void changed()
           if(theNeighbourCount==0)
              if(theX>0)
                 if(theY>0)
                    reveal(theY-1, theX-1);
                 reveal(theY, theX-1);
                 if(theY<theMapModel.getRowCount()-1)
                    reveal(theY+1, theX-1);
              if(theY>0)
                 reveal(theY-1, theX);
              if(theY<theMapModel.getRowCount()-1)
                 reveal(theY+1, theX);
              if(theX<theMapModel.getColumnCount()-1)
                 if(theY>0)
                    reveal(theY-1, theX+1);
                 reveal(theY, theX+1);
                 if(theY<theMapModel.getRowCount()-1)
                     reveal(theY+1, theX+1);
               setBackground(java.awt.Color.WHITE);
            else if(theNeighbourCount==9)
               setText("*");
               setBackground(java.awt.Color.RED);
               System.out.println("no!");
               theMap.setEnabled(false);
            else
               setText(String.valueOf(theNeighbourCount));
               setBackground(java.awt.Color.WHITE);
            setBorder(javax.swing.BorderFactory.createEmptyBorder());
            if(isFinished()==true)
               System.out.println("victory!");
               theMap.setEnabled(false);
            theMapModel.fireTableCellUpdated(theY,theX);
      private DefaultTableModel theMapModel;
      private int theX;
      private int theY;
      private short theNeighbourCount;
      protected boolean revealed = false;
      public Tile(int aYIndex, int anXIndex, short aNeighbourCount)
         theMapModel = (DefaultTableModel)theMap.getModel();
         theX = anXIndex;
         theY = aYIndex;
         theNeighbourCount = aNeighbourCount;
         addMouseListener(new JTileMouseListener());
         setOpaque(true);
         setHorizontalAlignment(CENTER);
         setBackground(java.awt.Color.LIGHT_GRAY);
         setBorder(javax.swing.BorderFactory.createRaisedBevelBorder());
         setSize(getHeight(), getHeight());
      public void reveal()
         revealed = true;
         theRevealedTileCount +=1;
         changed();
      public boolean isRevealed()
         return revealed;
   private JFrame theFrame;
   private JTable theMap;
   private int theMapSize = 10;
   private int theTrapCount = 5;
   private int theRevealedTileCount = 0;
   private void startGame()
      Point[] traps = new Point[theTrapCount];
      Random generator = new Random();
      for(int trapIndex = 0; trapIndex<theTrapCount; trapIndex+=1)
         Point newPoint = null;
         boolean alreadyTrapped = true;
         while(alreadyTrapped==true)
            newPoint = new Point(generator.nextInt(theMapSize-1), generator.nextInt(theMapSize-1));
            alreadyTrapped = false;
            for(int existingTrapIndex= 0; existingTrapIndex<trapIndex;existingTrapIndex++)
               if(newPoint.equals(traps[existingTrapIndex])) alreadyTrapped = true;
         traps[trapIndex] = newPoint;
      TableModel mapModel = theMap.getModel();
      for(int yIndex = 0; yIndex<theMapSize; yIndex+=1)
         for(int xIndex = 0; xIndex<theMapSize; xIndex+=1)
            short neighbours = 0;
            int x = 0;
            int y = 0;
            for(int trapIndex = 0; trapIndex<theTrapCount; trapIndex+=1)
               x = traps[trapIndex].x - xIndex;
               y = traps[trapIndex].y - yIndex;
               if(x==0 && y==0)
                  trapIndex = theTrapCount;
               else if((x==1 || x==-1) && (y==1 || y==-1))
                  neighbours += 1;
               else if((x==0) && (y==1 || y==-1))
                  neighbours += 1;
               else if((x==1 || x==-1) && (y==0))
                  neighbours += 1;
            if(x==0 && y==0)
               mapModel.setValueAt(new Tile(yIndex, xIndex, (short) 9), yIndex, xIndex);
            else
               mapModel.setValueAt(new Tile(yIndex, xIndex, neighbours), yIndex, xIndex);
      theRevealedTileCount = 0;
      theMap.setEnabled(true);
   private boolean isFinished()
      return ((theMapSize*theMapSize)-theRevealedTileCount)==theTrapCount;
   public MyMineSweeper()
      theFrame = new javax.swing.JFrame("mine sweeper");
      JPanel cp = new JPanel();
      theMap = new JTable(new DefaultTableModel(10,10)
         public Class getColumnClass(int column)
            return getValueAt(0, column).getClass();
      theMap.setDefaultRenderer(JComponent.class, new JTableCellRenderer(theMap.getDefaultRenderer(JComponent.class)));
      JTableCellEditor editor = new JTableCellEditor();
      theMap.setDefaultEditor(JComponent.class, editor);
      editor.setClickCountToStart(0);
      theMap.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
      startGame();
      cp.add(theMap);
      Action newGameAction = new AbstractAction("new game")
         public void actionPerformed(ActionEvent e)
            startGame();
      JButton newGameTrigger = new JButton(newGameAction);
      cp.add(newGameTrigger);
      theFrame.getContentPane().add(cp);
      theFrame.pack();
      theFrame.show();
   public JFrame getFrame()
      return theFrame;
}

How can I read the last cell of a JTable that a user Enters data

I have a one column JTable with several rows that a user enters data to. Upon entering the last data, the user clicks a button to read all the data from the rows in the JTable and puts them in an arraylist. If the user does not click enter or navigates away from the last cell, then after clicking the button it does not read the last cell entered. Since the user is clicking on a button to indicate he is done entering data on the table, does he also have to hit the enter key to indicate he is done entering the data?
The code below is my tablemodelListener:
public class InteractiveTableModelListener implements TableModelListener {
public void tableChanged(TableModelEvent evt) {
if (evt.getType() == TableModelEvent.UPDATE) {
int row = evt.getFirstRow();
System.out.println("Update row:"+" "+row);
jTable1.setRowSelectionInterval(row, row);
}

Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.
In the future, Swing related questions should be posted in the Swing fourm. (This question has been asked and answered dozens of times).
But there is not need to repost because [Table Stop Editing|http://www.camick.com/java/blog.html?name=table-stop-editing] explains whats happening and give a couple of solutions.

How to get the last value edited by users from JTable?

Hi.
I have a JDialog that includes an editable JTable. This table is used to set up field caption and font for a report program. I found only when cursor is moved to another cell, the value in current cell being edited will be transferred to Table Model. So if the user don�t move cursor to another cell after editing the value of a cell but click OK button directly, Table Model cannot get the last value edited by the user, I wonder if there is a way to fire JTable to transfer the value being edited to Table model.
By the way, I found if the TableCellEditor is using JCheckBox or JComboBox instead of JTextField, there is no this problem.
Thank you for any reply.

I guess you can make use of the following methods on your table model to inform it make it getValueAt bcos table data has changed.
fireTableCellUpdated
Notifies all listeners that the value of the cell at [row, column] has been updated.
fireTableChanged
Forwards the given notification event to all TableModelListeners that registered themselves as listeners for this table model.
fireTableDataChanged
Notifies all listeners that all cell values in the table's rows may have changed. The number of rows may also have changed and the JTable should redraw the table from scratch. The structure of the table (as in the order of the columns) is assumed to be the same.
But when to call these methods??
-- When OK button is pressed, do this as the first thing!!
OR
-- Call this on every key event!!
regds,
CA

How can i make perticular row or perticular cell Editable of a JTable

Dear al,
can u help me by guiding me for the problem of...
i am having a JTable, in which a (first)column of each row is having a checkbox field.
If the checkbox is checked then and then i should able to modify the cells in that row where the checkbox is.
I have created the table with AbstractTableModel of which the isCellEditable(int row, int col) method is overwriten. Whatever return value (true/false) reflects the perticular
cells becomes editable/non-editable respectively.
but at run time...(mean the table is created now) and now i want to make the cells editable/non-editable depending on the checkbox value...
how can i implement it.........
please suggest.........
thank you.........

here is the sample code from tutorial.......
* TableRenderDemo.java requires no other files.
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
* TableRenderDemo is just like TableDemo, except that it explicitly initializes
* column sizes and it uses a combo box as an editor for the Sport column.
@SuppressWarnings("serial")
public class TableRenderDemo extends JPanel {
     private boolean DEBUG = true;
     public TableRenderDemo() {
          super(new GridLayout(1, 0));
          JTable table = new JTable(new MyTableModel());
          // table.setEditingColumn(0);
          // table.editCellAt(0, 0);
          table.setPreferredScrollableViewportSize(new Dimension(500, 100));
          // Create the scroll pane and add the table to it.
          JScrollPane scrollPane = new JScrollPane(table);
          // Set up column sizes.
          initColumnSizes(table);
          // Fiddle with the Sport column's cell editors/renderers.
          setUpSportColumn(table, table.getColumnModel().getColumn(2));
          // Add the scroll pane to this panel.
          add(scrollPane);
      * This method picks good column sizes. If all column heads are wider than
      * the column's cells' contents, then you can just use
      * column.sizeWidthToFit().
     private void initColumnSizes(JTable table) {
          MyTableModel model = (MyTableModel) table.getModel();
          TableColumn column = null;
          Component comp = null;
          int headerWidth = 0;
          int cellWidth = 0;
          Object[] longValues = model.longValues;
          TableCellRenderer headerRenderer = table.getTableHeader()
                    .getDefaultRenderer();
          for (int i = 0; i < 5; i++) {
               column = table.getColumnModel().getColumn(i);
               comp = headerRenderer.getTableCellRendererComponent(null, column
                         .getHeaderValue(), false, false, 0, 0);
               headerWidth = comp.getPreferredSize().width;
               comp = table.getDefaultRenderer(model.getColumnClass(i))
                         .getTableCellRendererComponent(table, longValues, false,
                                   false, 0, i);
               cellWidth = comp.getPreferredSize().width;
               if (DEBUG) {
                    System.out.println("Initializing width of column " + i + ". "
                              + "headerWidth = " + headerWidth + "; cellWidth = "
                              + cellWidth);
               // XXX: Before Swing 1.1 Beta 2, use setMinWidth instead.
               column.setPreferredWidth(Math.max(headerWidth, cellWidth));
     public void setUpSportColumn(JTable table, TableColumn sportColumn) {
          // Set up the editor for the sport cells.
          JComboBox comboBox = new JComboBox();
          comboBox.addItem("Snowboarding");
          comboBox.addItem("Rowing");
          comboBox.addItem("Knitting");
          comboBox.addItem("Speed reading");
          comboBox.addItem("Pool");
          comboBox.addItem("None of the above");
          sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
          // Set up tool tips for the sport cells.
          DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
          renderer.setToolTipText("Click for combo box");
          sportColumn.setCellRenderer(renderer);
     class MyTableModel extends AbstractTableModel {
          private String[] columnNames = { "First Name", "Last Name", "Sport",
                    "# of Years", "Vegetarian" };
          private Object[][] data = {
                    { "Mary", "Campione", "Snowboarding", new Integer(5),
                              new Boolean(false) },
                    { "Alison", "Huml", "Rowing", new Integer(3), new Boolean(true) },
                    { "Kathy", "Walrath", "Knitting", new Integer(2),
                              new Boolean(false) },
                    { "Sharon", "Zakhour", "Speed reading", new Integer(20),
                              new Boolean(true) },
                    { "Philip", "Milne", "Pool", new Integer(10),
                              new Boolean(false) } };
          public final Object[] longValues = { "Sharon", "Campione",
                    "None of the above", new Integer(20), Boolean.TRUE };
          public int getColumnCount() {
               return columnNames.length;
          public int getRowCount() {
               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 false;
               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) {
               if (DEBUG) {
                    System.out.println("Setting value at " + row + "," + col
                              + " to " + value + " (an instance of "
                              + value.getClass() + ")");
               data[row][col] = value;
               fireTableCellUpdated(row, col);
               if (DEBUG) {
                    System.out.println("New value of data:");
                    printDebugData();
          private void printDebugData() {
               int numRows = getRowCount();
               int numCols = getColumnCount();
               for (int i = 0; i < numRows; i++) {
                    System.out.print(" row " + i + ":");
                    for (int j = 0; j < numCols; j++) {
                         System.out.print(" " + data[i][j]);
                    System.out.println();
               System.out.println("--------------------------");
     * 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("TableRenderDemo");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          // Create and set up the content pane.
          TableRenderDemo newContentPane = new TableRenderDemo();
          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();

Stopping cell editing in a JTable using a JComboBox editor w/ AutoComplete

Hi there! Me again with more questions!
I'm trying to figure out the finer parts of JTable navigation and editing controls. It's getting a bit confusing. The main problem I'm trying to solve is how to make a JTable using a combo box editor stop editing by hitting the 'enter' key in the same fashion as a JTextField editor. This is no regular DefaultCellEditor though -- it's one that uses the SwingX AutoCompleteDecorator. I have an SSCCE that demonstrates the issue:
import java.awt.Component;
import java.awt.EventQueue;
import javax.swing.AbstractCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.WindowConstants;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableModel;
import org.jdesktop.swingx.autocomplete.AutoCompleteDecorator;
public class AutoCompleteCellEditorTest extends JFrame {
public AutoCompleteCellEditorTest() {
    JTable table = new JTable();
    Object[] items = {"A", "B", "C", "D"};
    TableModel tableModel = new DefaultTableModel(2, 2);
    table.setModel(tableModel);
    table.getColumnModel().getColumn(0).setCellEditor(new ComboCellEditor(items));
    getContentPane().add(table);
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    pack();
private class ComboCellEditor extends AbstractCellEditor implements TableCellEditor {
    private JComboBox comboBox;
    public ComboCellEditor(Object[] items) {
      this.comboBox = new JComboBox(items);
      AutoCompleteDecorator.decorate(this.comboBox);
    public Object getCellEditorValue() {
      return this.comboBox.getSelectedItem();
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
      comboBox.setSelectedItem(value);
      return comboBox;
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
        new AutoCompleteCellEditorTest().setVisible(true);
}Problem 1: Starting to 'type' into the AutoCompleteDecorate combo box doesn't cause it to start editing. You have to hit F2, it would appear. I've also noticed this behaviour with other JComboBox editors. Ideally that would be fixed too. Not sure how to do this one.
Problem 2: After editing has started (say, with the F2 key), you may start typing. If you type one of A, B, C, or D, the item appears. That's all good. Then you try to 'complete' the edit by hitting the 'enter' key... and nothing happens. The 'tab' key works, but it puts you to the next cell. I would like to make the 'enter' key stop editing, and stay in the current cell.
I found some stuff online suggesting you take the input map of the table and set the Enter key so that it does the same thing as tab. Even though that's not exactly what I desired (I wanted the same cell to be active), it didn't work anyway.
I also tried setting a property on the JComboBox that says that it's a table cell editor combo box (just like the DefaultCellEditor), but that didn't work either. I think the reason that fails is because the AutoCompleteDecorator sets isEditable to true, and that seems to stop the enter key from doing anything.
After tracing endless paths through processKeyBindings calls, I'm not sure I'm any closer to a solution. I feel like this should be a fairly straightforward thing but I'm having a fair amount of difficulty with it.
Thanks for any direction you can provide!

Hi Jeanette,
Thanks for your advice. I looked again at the DefaultCellEditor. You are correct that I am not firing messages for fireEditingStopped() and fireEditingCancelled(). Initially I had copied the behaviour from DefaultCellEditor but had trimmed it out. I assumed that since I was extending AbstractCellEditor and it has them implemented correctly that I was OK. But I guess that's not the case! The problem I'm having with implementing the Enter key stopping the editing is that:
1) The DefaultCellEditor stops cell editing on any actionPerformed. Based on my tests, actionPerformed gets called whenever a single key gets pressed. I don't want to end the editing on the AutoCompleteDecorated box immediately -- I'd like to wait until the user is happy with his or her selection and has hit 'Enter' before ending cell editing. Thus, ending cell editing within the actionPerformed listener on the JComboBox (or JXComboBox, as I've made it now) will not work. As soon as you type a single key, if it is valid, the editing ends immediately.
2) I tried to add a key listener to the combo box to pick up on the 'Enter' key and end the editing there. However, it appears that the combo box does not receive the key strokes. I guess they're going to the AutoCompleteDecorator and being consumed there so the combo box does not receive them. If I could pick up on the 'Enter' key there, then that would work too.
I did more reading about input maps and action maps last night. Although informative, I'm not sure how far it got me with this problem because if the text field in the AutoCompleteDecorator takes the keystroke, I'm not sure how I'm going to find out about it in the combo box.
By the way, when you said 'They are fixed... in a recent version of SwingX', does that mean 1.6.2? That's what I'm using.
Thanks!
P.S. - Maybe I should create a new question for this? I wanted to mark your answer as helpful but I already closed the thread by marking the answer to the first part as correct. Sorry!
Edited by: aardvarkk on Jan 27, 2011 7:41 AM - Added SwingX versioning question.

Need help serializing an AbstractTableModel for a JTable with cell editing.

Fun times are ahead. Here we go!
I have a JTable that contains data I'd like to serialize out to a file to be restored and viewed later.
So I tried saving the AbstractTableModel subclass out to a file. Whenever I do this, I get the following error message:
java.io.NotSerializableException: javax.swing.JTable$CellEditorRemover
Now I know for fact that serializing an AbstractTableModel that was installed in a JTable without cell editing works just fine (my old code did exactly that). As a result, I think that the code that handles events in the AbstractTableModel contains references back out to the JTable, which causes the JTable to be saved no matter what (even though I'm just interested in saving the TableModel only). It causes a bigger file than normal, but file size is not an issue. The only issue I have is that CellEditorRemover (an undocumented inner class of JTable), which is automatically installed for JTables with editable cells, is not serializable.
This leads to the following questions:
1. Is there a way to avoid serialization/deserialization of the CellEditorRemover inner class of JTable?
2. Is there a way to save an AbstractTableModel without saving all of the event listeners associated with it?
I think an answer to either of these questions would go a long way towards solving my problem. Otherwise, I'll resign myself to weeping silently in the corner of my office.
Thanks!

I would suggest that if you can you only save the
data... but i would do this by using the
externalizable interface.
What you will need to do is have the
writeExternal(ObjectOutputStream out) and
readExternal(ObjectOutputStream out) methods in your
class. These will be responsiable for saving the
data.
Here's an example of what you can do in these
methods... this is just a little tidbit from a program
i've written.public void writeExternal(ObjectOutput out) throws
IOException {
          out.writeInt(size);
          out.writeObject(drawName);
          out.writeInt(playersLength);
for(int i = 0; i < playersLength; i++)
) out.writeObject(players);
          out.writeInt(seedsLength);
for(int i = 0; i < seedsLength; i++)
) out.writeObject(seeds[i]);
          out.writeInt(drawLength);
for(int i = 0; i < drawLength; i++)
) out.writeObject(draw[i]);
public void readExternal(ObjectInput in) throws
IOException, ClassNotFoundException {
          size = in.readInt();
          drawName = (String)in.readObject();
          playersLength = in.readInt();
for(int i = 0; i < playersLength; i++) players[i] =
= (String)in.readObject();
          seedsLength = in.readInt();
for(int i = 0; i < seedsLength; i++) seeds[i] =
= (String)in.readObject();
          drawLength = in.readInt();
for(int i = 0; i < drawLength; i++) draw[i] =
= (String)in.readObject();
You can now use your class as you would a Serializable
class, but it will only save the data
Hope this helped
webaf409java
I forgot to add some critical information in my original post. My apologies. :(
I've thought about using Externalizable, but am hesitant to use it because the application would no longer be able to read in files using the old save format (ie, AbstractTableModels for JTables without CellEditorRemovers ). I want to preserve the ability to read the old saved AbstractTableModel formats if possible.
Do you know of a way to revert to the default deserialization mechanism from readExternal? This way, during deserialization, I could do a quick test on the object being read and have the ability to default to the regular deserialization mechanism if the object is of the old type or continue with the new Externalizable stuff if the object is one of the new type. Maintaining file compatibility is key.

JTree stop cell editing on lost focus and scrollPathToVIsible behavior

how can you make a Jtree that uses a DefaultTreeCellEditor stop editing when it loses focus to a component other than the
cell editor's DefaultTextField component ?
i had to use a custom TreeCellEditor and attach my focus listener to the DefaultTextField object and attach it also to the JTree object
          DefaultTreeCellEditor celEditor = new DefaultTreeCellEditor(containerTree,renderer)
               @Override
               public Component getTreeCellEditorComponent(JTree tree, Object value,
                                 boolean isSelected,
                         boolean expanded,
                         boolean leaf, int row) {
                    Component comp = super.getTreeCellEditorComponent(tree, value, isSelected, expanded, leaf, row);
                    boolean found= false;
                    for(FocusListener f:editingComponent.getFocusListeners())
                         if(focusListener.equals(f))
                              found=true;
                              break;
                    if(!found)
                         editingComponent.addFocusListener(focusListener);
                    return comp;
myTree.addFocusListener(focusListener);in JTable there's a property that you switch on/off which does exactly that, is there anything alike for JTree ?
one more thing,after adding a new TreeNode to the JTree,i'm calling scrollPathToVisible(<path to the new node>),but for all the nodes i add except the first, the user object is not displayed,am i missing something? here's my code
          ActionListener actionListener = new ActionListener(){
               public void actionPerformed(ActionEvent ae){
                    DefaultTreeModel model = (DefaultTreeModel)containerTree.getModel();
                    int nodeCount=containerTree.getModel().getChildCount(root);
                    if(ae.getSource().equals(menuAdd))
                         DefaultMutableTreeNode newNode=new DefaultMutableTreeNode();
                         if(currentNode>0 && currentNode+1<nodeCount)
                              model.insertNodeInto(newNode, root, currentNode+1);
                              newNode.setUserObject("container #"+(currentNode+1));
                         else
                              model.insertNodeInto(newNode, root, root.getChildCount());
                              newNode.setUserObject("container #"+nodeCount);
                         TreePath path = new TreePath(newNode.getPath());
                                        // only works properly for 1st node,for the rest i have to
                                        // click on the new node to get the proper display
                         containerTree.scrollPathToVisible(path);
                    else if(nodeCount>=0 && currentNode!=0)
                         model.removeNodeFromParent((DefaultMutableTreeNode)model.getChild(root, currentNode-1));
          };

i solved the second issue by selecting the new node and starting to edit it

JTable - disable cell editing for whole table

I need to know how to disable cell editing for the whole of a JTable. Is there an easy way of doing this??

you can do it very easy :)
just override AbstractTableModel's isCellEditable(int row, int col) function
and return false is ok.
Hope this helps!

Start or stop edit jtable cell editing

Hello,
I got a problem with the jtable DefaultModel isCellEditable.
If I set the IsCellEditable to false, I would not be able to enable the cell selection as and when I want it.
What I have in mind is the add a mouselister so that if the user select a row using fast left mouse click like the procedure shown below
private class MouseClickHandler extends MouseAdapter {
public void mouseClicked(MouseEvent event) {
int no_mouseclick = 0;
no_mouseclick = event.getClickCount();
if (no_mouseclick >= 2) {
int cur_row = 0;
cur_row = table.getSelectedRow();
// table.setColumnSelectionAllowed(true);
// table.setRowSelectionAllowed(true);
for (int i=0;i<table.getColumnCount();i++){
table.editCellAt(cur_row,i);
System.out.println("mouse row--->" + cur_row);
I could overwrite the IsCellEditable to true to enable that particular or cell contains in that row to be able to accept input and overwrite any data which in my case obtained from the Sql database a sort of like input module using tabulation . I am also thinking of using text component or combobox to display the value for user selection , but I do not know how to enable a particular cell for editing if the Jtable created is using a non-editable DefaultModel. If I set the IsCellEditable to true, every single cell would be enable for editing , and this defeat the purpose of enable user input only upon double mouseclicks.
By the way , I am interested to know how to track the data changes in the cell within the jtable so that only those have been modified are notify from the Table model and updated into the Sql table
Could anyone of you out there provide some hints please
Thanks

Hello,
Tablemodellistener could detect the changes in the data, how about the backend database updating and transactional activity that must be associated with the data changes?
What is on my mind is that , the moment there is changes in the data detected by the TableModellistener, whatever records associated with or brougt up by Jtable would be all deleted from the database and then follow by the new set of new records to be inserted into the database. The disadvantage of this method is that everytime the backend database connection and activity need to be executed the moment there is a change in the data in the jtable cell. For example the user may be just amendment to only one cell , but all the records associated need to be deleted and then inserted again.
Perhaps there are better solution to deal with Jtable and JDBC backend connection where in this case, I am using JDO to undertake the database activity like the observable modelling .
Could someone provide the hint please
Thank

Recognize ENTER hit on JTable after cell edit is done

Hello,
I'm trying to find a way to detect a key press (specifically, Enter key) after editing a value on a JTable. That is, when I double click on a cell in my table, edit the value and press enter after the editing is done, I want to be able to detect pressing the enter. Adding a normal keyListener to the JTable object won't do it. So I'm trying to find a new way. Please help me out!
Here's my SSCCE:
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class MyTable extends JTable {
     JTable table;
     public MyTable(Object[][] data, Object[] columnNames)
          JFrame frame = new JFrame("My Table");
          table = new JTable(data, columnNames);
          JScrollPane scrollPane = new JScrollPane(table);
          frame.getContentPane().add(scrollPane);
          frame.setSize(100, 100);
          frame.setVisible(true);
          table.addKeyListener(new KeyAdapter()
               public void keyPressed(KeyEvent e)
                    if(e.getKeyChar()==KeyEvent.VK_ENTER)
                         System.out.println("Key Pressed");
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          Object [][]data = {{"item1"},{"item2"},{"item3"},{"item4"},{"item5"}};
          String []columnNames = {"ITEMS"};
          MyTable table = new MyTable(data, columnNames);
}Message was edited by:
programmer_girl

First of all you don't use a KeyListener to check for KeyEvents on a compponent. You use "Key Bindings" and Actions:
http://java.sun.com/docs/books/tutorial/uiswing/misc/keybinding.html
When you are "editing" a cell then focus is on the edtitor used by cell editor. For a cell containing Strings a JTextField is used. Since a JTextField supports an ActionListener all you need to do is get the JTextField and add an ActionListener to the text field. You can use the getDefaultEditor(...) method of JTable and cast the editor to a DefaultCellEditor. From there you can then get the editing component.
Of course the question is why are you specifically worried about the enter key? What if the user tabs to the next cell or uses the mouse to click on a different cell. There is more than one way to finish editing a cell.

JTable & Cell editing

Hi,
I am using JTable and facing following problem. My UI has a JTable and JButton with mnemonic set. The button populates the date into the table. Here is the sequence
1) Enter into editing mode by pressing F2 and enter value EE
2) I press the mnemonic set for button
3) ActionListener attached to button is executed. This ActionListener populates the data into the table.
4) The cell on which editing was started remains in the editing mode and the value for edited cell does not change to the populated by ActionListener but remains EE. (This is the problem)
What i want is whenever focus moves out of the table if the table is in editing mode then it should cancel the editing.
I tried attaching the focus listener but problem with this is focusLost is fired even when i press F2 i.e. start editing.
Any help will be of great use
Thanks in advance
Sachin

Hi,
It works in normal scenaios. I faced problem in following
1) My cell editor has a verifier attached. if i show a dialog box from verify method and then return false from method focus remains in cell only, this is fine.
2) If i show the dialog and return true from verify method, table remains in editing mode and focus gets transferred to the field. This time i am navigating through mouse.
3) In the same scenario (2) if i tab out of the field cell does not come out of edit mode i have to press tab to come out of the field.
Any idea??
Sachin

How to remove "Created by" and "Last Modified" on Edit list item

Hi,
I have a custom list, after adding items when I try to edit, I can see "Created by" and "Last Modified" at the bottom left(You can see in pic below). I need to remove it, How can I achieve this? This is overlapping with some of
my fields when I try to hide some fields
Any help would be appreciated. Thanks in advance
Praveen Teja

Hey,
The other option is you can remove it using jquery code. You need to do is put below code in CEWP on your list from.
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
<script language="javascript" type="text/javascript">
$(document).ready(function () {
$("td[id='onetidinfoblock1']").remove();
$("td[id='onetidinfoblock2']").remove();
</script>
Thanks.Please mark it as an answer if it helps.

JTable and last cell edited

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