Adding rows to Jtable with spanded cells

I have a jtable with multiple spanded cells. I am using a custom jtable(the code is in http://www2.gol.com/users/tame/swing/examples/JTableExamples4.html) but i need insert a new row when you click on a button.
I doing this:
jtable.getModel().addRow(vector);
but it throws an exception:
Exception occurred during event dispatching:
java.lang.ArrayIndexOutOfBoundsException: 11 >= 11
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableModel.getValueAt(Unknown Source)
at javax.swing.JTable.getValueAt(Unknown Source)
at javax.swing.JTable.prepareRenderer(Unknown Source)
at jp.gr.java_conf.tame.swing.table.MultiSpanCellTableUI.paintCell(MultiSpanCellTableUI.java:96)
at jp.gr.java_conf.tame.swing.table.MultiSpanCellTableUI.paintRow(MultiSpanCellTableUI.java:68)
at jp.gr.java_conf.tame.swing.table.MultiSpanCellTableUI.paint(MultiSpanCellTableUI.java:39)
at javax.swing.plaf.ComponentUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JViewport.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintWithBuffer(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Can anybody help me

I am using the same code in http://www.codeguru.com/java/articles/139.shtml but it thorws the same exception.
I need a solution it is urgent

Similar Messages

Help with adding rows to JTable

Could any body help me with the following problem:
I have created form where I use JTable.Initially I should show 5 rows in JTable. User can enter data into the cells.And commit I should store the data in database.
My problem is how to dynamically add rows to JTable as user is entering the data. And how to retain the data in the cells when it is entered.
Right now when user edits a cell and tabs to next one the data in previous cell disappears.
Its Urgent can anybody help me
Thanks in advance
Babu

The number of rows, number of columns, etc, are all determined by the TableModel used in the JTable.
What is the easiest solution is to subclass AbstractTableModel adding methods to support your dynamic row adding/deleting/etc that you need. If you go to the javadoc for JTable, there's a link to a tutorial which contains most of what you need to know.
- David

Problem sorting JTable with custom cell editor

Greetings,
I have created a JTable with a JComboBox as the cell editor for the first column. However, I couldn't simply set the default cell editor for the column to be a JComboBox, since the values within the list were different for each row. So instead, I implemented a custom cell editor that is basically just a hashtable of cell editors that allows you to have a different editor for each row in the table (based on the ideas in the EachRowEditor I've seen in some FAQs - see the code below). I also used a custom table model that is essentially like the JDBCAdapter in the Java examples that populates the table with a query to a database.
The problem comes when I try to sort the table using the TableSorter and TableMap classes recommended in the Java Tutorials on JTables. All of the static (uneditable) columns in the JTable sort fine, but the custom cell editor column doesn't sort at all. I think that the problem is that the hashtable storing the cell editors never gets re-ordered, but I can't see a simple way to do that (how to know the old row index verses the new row index after a sort). I think that I could implement this manually, if I knew the old/new indexes...
Here's the code I use to create the JTable:
// Create the Table Model
modelCRM = new ContactTableModel();
// Create the Table Sorter
sorterCRM = new TableSorter(modelCRM);
// Create the table
tblCRM = new JTable(sorterCRM);
// Add the event listener for the sorter
sorterCRM.addMouseListenerToHeaderInTable(tblCRM);
Then, I populate the column for the custom cell editor like this:
// Add the combo box for editing company
TableColumn matchColumn = getTable().getColumn("Match");
RowCellEditor rowEditor = new RowCellEditor();
// loop through and build the combobox for each row
for (int i = 0; i < getTable().getRowCount(); i++) {
JComboBox cb = new JComboBox();
cb.addItem("New");
//... code to populate the combo box (removed for clarity)
rowEditor.add(i,new DefaultCellEditor(cb, i))); //TF
} // end for
matchColumn.setCellEditor(rowEditor);
Any ideas how to do this, or is there a better way to either sort the JTable or use a combobox with different values for each row? Please let me know if more code would help make this clearer...
Thanks,
Ted
import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
public class RowCellEditor implements TableCellEditor
protected Hashtable editors;
protected TableCellEditor editor, defaultEditor;
public RowCellEditor()
editors = new Hashtable();
defaultEditor = new DefaultCellEditor(new JTextField());
public void add(int row, TableCellEditor editor)
editors.put(new Integer(row), editor);
public Component getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int row,
int column)
editor = (TableCellEditor) editors.get(new Integer(row));
if (editor == null)
editor = defaultEditor;
return editor.getTableCellEditorComponent(table,
value,
isSelected,
row,
column);
public Object getCellEditorValue() {
return editor.getCellEditorValue();
public boolean stopCellEditing() {
return editor.stopCellEditing();
public void cancelCellEditing() {
editor.cancelCellEditing();
public boolean isCellEditable(EventObject anEvent) {
return true; //TF
//return editor.isCellEditable(anEvent);
public void addCellEditorListener(CellEditorListener l) {
editor.addCellEditorListener(l);
public void removeCellEditorListener(CellEditorListener l) {
editor.removeCellEditorListener(l);
public boolean shouldSelectCell(EventObject anEvent) {
return editor.shouldSelectCell(anEvent);
-------------------

Well, I found a solution in another post
(see http://forum.java.sun.com/thread.jsp?forum=57&thread=175984&message=953833#955064 for more details).
Basically, I use the table sorter to translate the row index for the hashtable of my custom cell editors. I did this by adding this method to the sorter:
// This method is used to get the correct row for the custom cell
// editor (after the table has been sorted)
public int translateRow(int sortedRowIndex)
checkModel();
return indexes[sortedRowIndex];
} // end translateRow()
Then, when I create the custom cell editor, I pass in a reference to the sorter so that when the getTableCellEditorComponent() method is called I can translate the row to the newly sorted row before returning the editor from the hashtable.

How can we have a JTable with rounded cells

I want to create a JTable with circular or oval shaped Cells, can anybody please help me as to how to go about it?
Thanks in advance

If you share an Apple ID for purchases then you share all purchases.
You can hide purchases that are not synced locally (with the cloud icon next to them) to the device here:
Settings > Music > tuen Show All Music off
I suggest you create a playlist for each person in iTunes on your computer with only their music on it. Then sync just that playlist to each persons device.

JTable with custom cell for folding and unfolding rows

Hi,
I am trying to implement a JTable, whereas one of the columns is a custom component, which has a small + in the right upper corner.
When you push this + the JTable should unfold other rows, giving more detail on the current row.
So something like this :
|--------------------------------|
| <some-string> + |
|--------------------------------|Drawing this custom component for the column is no problem but I am having trouble implementing the MouseMotionListener events over this.
If I add a mouseMotionListener to the JTable, I am able to forward these events to my custom class which draws this custom component.
But off course the X and Y coordinates of this MouseEvent are not mapped into the grid of my custom component, which poses my question.
How can I attach to each cell of this custom column of my JTable, a listener as to implement some mouseover and mouseclick stuff ?
In case this post is not all that clear, I will try to add a demo showing my problem.
Kind regards,
Wim.

You're reinventing a wheel that's been done a few times. One example is JTreeTable (http://community.java.net/javadesktop/) but there are others.

Problem in adding row in JTable

Hi,
I was trying to add a row in a table when the add button is clicked. But i am missing something that's why i am getting some exceptions.
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import javax.swing.JButton;
import java.util.Vector;
import java.awt.event.*;
public class TableDemo extends JFrame implements ActionListener {
        int rows = 1;
        int cols = 4;
        JTable table = new JTable();
        TModel model = new TModel();
        JButton button = new JButton("Add");
        Object[][] values = {
                                      {"Java","Linux","Hello","World"}
        class TModel extends DefaultTableModel {
                public boolean isCellEditable(int parm1, int parm2){
                        return true;
                public int getRowCount(){
                        return rows;
                public int getColumnCount(){
                        return cols;
                public void setValueAt(Object aValue, int aRow, int aColumn) {
                        values[aRow][aColumn] = aValue;
                public Object getValueAt(int aRow, int aColumn) {
                        return values[aRow][aColumn];
                public String getColumnName(int column) {
                        return "Error " + column;
        public TableDemo(String title){
                super(title);
                JPanel panel = new JPanel();
                panel.setLayout(new BorderLayout());
                table.setModel(model);
                // Make the columns with gradually increasing width:
                String columnName[] = {"Column", "Operator", "Values", "Logical"};
                for (int i = 0; i < columnName.length; i++) {
                        TableColumn column = new TableColumn(i);
                        int width = 100+20*i;
                        column.setPreferredWidth(width);
                        column.setHeaderValue(columnName);
model.addColumn(column);
// Create the table, place it into scroll pane and place
// the pane into this frame.
JScrollPane scroll = new JScrollPane();
// The horizontal scroll bar is never needed.
scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scroll.getViewport().add(table);
button.addActionListener(this);
panel.add(scroll, BorderLayout.CENTER);
panel.add(button, BorderLayout.SOUTH);
getContentPane().add(panel, BorderLayout.CENTER);
public void actionPerformed(ActionEvent ae) {
if(ae.getSource() == button) {
Vector tempRow = new Vector();
model.setRowCount(rows++);
tempRow.addElement("One");//new JComboBox());
tempRow.addElement("Two");
tempRow.addElement("Three");
tempRow.addElement("Four");
model.addRow(tempRow);
model.fireTableDataChanged();
System.out.println("Hi");
public static void main(String[] args) {
TableDemo frame = new TableDemo("Table double click on the cell to edit.");
frame.setSize(new Dimension(640, 400));
frame.validate();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
The code is generating the follwoing exception when add button is clicked :
java.lang.ArrayIndexOutOfBoundsException: 2 > 1
at java.util.Vector.insertElementAt(Vector.java:557)
at javax.swing.table.DefaultTableModel.insertRow(DefaultTableModel.java:343)
at javax.swing.table.DefaultTableModel.addRow(DefaultTableModel.java:319)
at com.saijava.TableDemo.actionPerformed(TableDemo.java:96)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:480)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
java.lang.ArrayIndexOutOfBoundsException: 1
at com.saijava.TableDemo$TModel.getValueAt(TableDemo.java:55)
at javax.swing.JTable.getValueAt(JTable.java:1771)
at javax.swing.JTable.prepareRenderer(JTable.java:3724)
at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:1149)
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)
at javax.swing.JComponent.paintChildren(JComponent.java:647)
at javax.swing.JComponent.paint(JComponent.java:817)
at javax.swing.JViewport.paint(JViewport.java:722)
at javax.swing.JComponent.paintChildren(JComponent.java:647)
at javax.swing.JComponent.paint(JComponent.java:817)
at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4787)
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4740)
at javax.swing.JComponent._paintImmediately(JComponent.java:4685)
at javax.swing.JComponent.paintImmediately(JComponent.java:4488)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:189)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:478)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

Umm. A few tips:
1) You should NOT instantiate objects / initialize variables outside the constructor. And please use access-modifiers.
2) Do not make your main-class extend JFrame or implement ActionListener. Instead create a JFrame in main and use an anonymous inner class as an ActionListener
3) Why are you extending DefaultTableModel? To set the the column names as Error1, etc.? You can set the column names by using an appropriate constructor for JTable or by using setColumnIdentifiers(...). See the API.
4) The actual problem most likely lies here:
int rows = 1;
int cols = 4;Why are you defining these outside the TableModel?

Size of combobox in JTable with custom cell editor

Hi All -
I have a JTable that displays a combobox in certain cells. I have a custom table model, renderer, and editor. All of that works fine. I render the combobox with the renderer, and then return the combobox as an editor in the editor so that it can drop down and actually be of use. My problem is - I set the size of the combobox with a setBounds call in the renderer, I add it to a panel, and return the panel - because I dont want the combobox to take up the entire space of the cell. This approach fails in the editor. The setBounds and setSize calls have no effect. As soon as you click the combobox, the editor takes over and all of a sudden the combobox resizes to the entire area of the cell. I assume this is because in the editor you arent actually placing anything - your simply returning the "editing form" of the component.
So - anybody know of a way to work around this? Worst case, I could just allow the combobox to use the entire area of the cell - but it makes it uglier so I figured I would run it by the forums.
Eric

Rather than just redirect you to my previous answer from ages ago, I'll just give it again. :-)
You can actually do this, but you have to get tricky. By default, the dropdown's width will be the same width as the cell... but it doesn't have to be that way. Essentially what you have to do is override the UI (MetalComboBoxUI) for the combo component. In your new customized UI component subclass (that you set the combo to use), modify the the createPopup() method of this UI class, and add your own logic to set the size of the popup before you return it.
Ideally the size would be based on the computed max width of a rendered item shown in the combo, but really you could set it to whatever just to see how it works.

JTable with JButton Cell renderer

How can I get buttons (JButtons) to "depress" properly in a JTable when using them as the cell renderer for a specific column in a JTable? Currently when pressing any button in the column, there is no change in the visible state of the button, i.e. it doesn't change color to create impression of depression.

Is the [problem not the fact that the JTable cell renderers merely rubberstamp each cell with the appropriate display, i.e. the actual component in the cell is not an actual button (just looks like one)? If this is the case, then the same problem will persis with a JToggleButton as well won't it?

Add Row instance but with adjusted cell references

Is there a by to use the AddInstance and have the cells in the "new" row have adjusted cell references , such as Cell1-1, Cell1-2 or will they have the same name always?
I want the info from the cells to link elsewhere with Global Binding.
Thanks,
tucson102

You cannot change the names of form objects during runtime.
When you repeat an existing row, all child elements (cells) will have the same name as in the other instances of the row.
Table1.Row[0].Cell1, Table1.Row[0].Cell2, Table1.Row[0].Cell3 etc.
Table1.Row[1].Cell1, Table1.Row[1].Cell2, Table1.Row[1].Cell3 etc.
Table1.Row[2].Cell1, Table1.Row[2].Cell2, Table1.Row[2].Cell3 etc.
Table1.Row[3].Cell1, Table1.Row[3].Cell2, Table1.Row[3].Cell3 etc.
If you make those cells binding global all cells with the same name will be global too and have the same value.

JSF: Problems adding rows to table with custom method

Since this being my first post, I find it only appropriate to thank the development team for such a huge addition to the application development world. You guys rock. You have cured my Java identity crisis. That being said...
I have been stumped for days. I'm making a simple web cart. I am trying to get two string values (name and price) passed through a custom exposed application module method ran on a backing bean. What I want the exposed VO module to do is, upon receiving the two strings, create a new row on the empty data controlled table I have built to store them. Basically I just need to add rows to a table with my custom managed bean. Most recent version.
I have written a test method to make sure my backing bean and exposed app module impl were working. This test works:
//WORKS
//CartInfo.java
    public String cb1_action() {
        AppModuleImpl am = new AppModuleImpl();
        am.testMethod();
        return null;
//AppModuleImp.java
    public void testMethod() {
        System.out.println("WORKS");
    }I found some code on how to add rows and unfortunately it isn't working out for some reason. Here is what is producing the error "Caused By: java.lang.NullPointerException" :
//DOESN'T WORK IN CUSTOM METHOD BUT WORKS WHEN DRAGGED ON TO THE PAGE AS A COMMAND BUTTON
//CartInfo.java
    public String cb1_action() {
        AppModuleImpl am = new AppModuleImpl();
        am.testMethod("test", "test");
        return null;
//AppModuleImp.java
       public void testMethod(String pName,String pPrice) {
        ViewObjectImpl vo = this.getCartVO1();
        Row r = vo.createRow();
        r.setAttribute("NAME", pName);
        r.setAttribute("PRICE", pPrice);
        vo.insertRow(r);
//The VO attributes for the DC are:
// Name : Type : Alias Name : Entity Usage : Info
NAME : String : NAME : (blank) : Transient
PRICE : String : PRICE : (blank) : TransientSo what I have so far is a table linked to my database. A user can select and click on a product on the row's individual Add button and using a modified selection listener, it returns the values to the backing_bean.
Then what I want it to do is have those variables passed to the other table. I just can't put it together.
Please if there is anyone that could send me in the right direction I would greatly appreciate it!
Thank you,
Jack

if i understand you, you want to call application module method when user clicks on add button on the UI and your table is from VO
so what i can come up for now is:
1) create variable binding from the iterator for both name and price.
2) on your UI action button :
<af:commandButton actionListener="yourbean.addToCart">
<f:attribute name="pName" value ="binding.<created name bind variable>"
<f:attribute name="pPrice" value = "binding.<created price bind variable>"
</af:commandButton>
3) custom Managed Bean:
//yourBean.java
public void addToCart(ActionEvent e){
// get binding here
// use executeWitParams method to send parameter to the function "testMethod" and execute
//AppModuleImp.java
public void testMethod(String pName,String pPrice) {
CardVOImpl vo = this.getCartVO1();
CardVORowImpl r = (CardVORowImpl)vo.createRow();
r.setAttribute("NAME", pName);
r.setAttribute("PRICE", pPrice);
vo.insertRow(r);
Hope this helps...
Let me know if not..
Thanks
Edited by: MavenDev on Oct 30, 2011 8:08 PM

JTable with JComboBox cells

Hi all,
When I make the JComboBox(es) become the cell of the JTable, the list of JComboBox is not expanded as the way a JComboBox behaves when you click on the arrow to see the whole list. I think the JComboBox is not receiving the mouse click event. Another way to say, something keeps the JComboBox from receiving the mouse click.
Has anybody experienced this scenario?
Frank.

Is the table cell editable? If it isn't, that is your problem. Enable cell editing for that cell(s).
Stephen

JTable with Labeles cells

Is it possible to create Table where each cell
will have permanent label (its number) together with an editable text?

Yes we can have it like that
for that u need to create a panel with one label and textbox in it
and renderer that column with this panel

JTable with more cell editors??

Hi,
I have a JTbale in which I have two special columns- one with buttons and the other similar to the the color changer from the swing tutorial.
My question is should I have now two renders and two editors in this situation?
Tnax

should I have now two renders and two editors in this situation?You should!
;o)
V.V.

Row with one cell in JTable

I have a JTable with multiple cells per row. However, in-between some rows, I would like to have a header row which doesn't change as I scroll horizontally. Is that possible?
Another question about JTables: Is it possible to have fixed cells on the right as well as on the left, with some cells in-between which you can scroll?

I have a JTable with multiple cells per row. However, in-between some rows, I would like to have a header row which doesn't change as I scroll horizontally. Is that possible?
Another question about JTables: Is it possible to have fixed cells on the right as well as on the left, with some cells in-between which you can scroll?

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.

Adding rows to Jtable with spanded cells

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