Update jtable cell via numeric keypad

Hi,
I have a problem, trying to figure out how to input numbers in a jtextfield in a jtable cell, from a group of jbuttons (rendered as a numeric keypad). I can get the cell to focus, but when I click on one of the jbuttons in the keypad, the cell loses focus and nothing is printed. I can update the cell by directly typing from the keyboard; that works fine. But I'm lost when trying to do it from the touch-screen keypad. Can anyone point me in the right direction. I assume I need to attach additional listeners somewhere.
Thanks in-advance.
Lee

I can get the cell to focus, Then the code for you button would need to be something like:
String text = (String)table.getValueAt(...);
String updated = text + button.getText();
table.setValueAt(updated, ...);

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Update JTable cells via setValueAt

Hello all,
I'm trying to implement a setValueAt method using an arrayList.....no success.What listeners should I have set up(For JTable or my table model)? I am new at this and I'm trying to update the JTable cells after a query from some db. Could anyone help?
When trying to change the a value in the table I get these errors:
"Exception occurred during event dispatching:
java.lang.ClassCastException: java.lang.String
at CachingResultSetTableModel.getValueAt(CachingResultSetTableModel.java:37)
at javax.swing.JTable.getValueAt(JTable.java:1711)
at javax.swing.JTable.prepareRenderer(JTable.java:3530)"
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if(r < cache.size()){
row[c] = (Object[])cache.set(r, avalue);
fireTableCellUpdated(r, c);
}//setValueAt
*********For reference here's the getValueAt method*************************
public Object getValueAt(int r, int c){
if(r < cache.size()){
row = (Object[])cache.get(r);
return row[c];
else
return null;
}//getValueAt

I would think that everone who starts off with JTable will have a couple of concept problems. I am also going thru this learnig curve. It looks to me ( the blind leading the blind etc) like your basic table has strange data in it. The problem is occuring when the JTable is trying to setup the data from the table model.
I don't think its anything to do with setValueAt.
I kept going back to TableMap, TableSorter and JDBCAdaptor examples and copying the code from them to come right.> I debug by putting a System.out .... in all the methods until I get to where the code is giving trouble.
Good luck [email protected]
Hello all,
>
I'm trying to implement a setValueAt method using an
arrayList.....no success.What listeners should I have
set up(For JTable or my table model)? I am new at
this and I'm trying to update the JTable cells after a
query from some db. Could anyone help?
When trying to change the a value in the table I get
these errors:
"Exception occurred during event dispatching:
java.lang.ClassCastException: java.lang.String
at
CachingResultSetTableModel.getValueAt(CachingResultSetT
bIleModel.java:37)
at javax.swing.JTable.getValueAt(JTable.java:1711)
at
javax.swing.JTable.prepareRenderer(JTable.java:3530)"
public void setValueAt(Object avalue, int r, int c){
if(r < cache.size()){
row[c] = (Object[])cache.set(r, avalue);
fireTableCellUpdated(r, c);
}//setValueAt
*********For reference here's the getValueAt
method*************************
public Object getValueAt(int r, int c){
if(r < cache.size()){
row = (Object[])cache.get(r);
return row[c];
else
return null;
}//getValueAt

JTable cell only numerical

Hello,
it`s possible in cell of a JTabel th context only numerical or letters. Is there any function for this?
Thanks for any answer or tip!!!

JTable can use custom editors: see the tutorial, and particularly:
+ [url http://java.sun.com/docs/books/tutorial/uiswing/components/table.html]How to Use Tables
|---...
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|---...
|--- [url http://java.sun.com/docs/books/tutorial/uiswing/components/formattedtextfield.html]How to Use Formatted Text Fields
|---...

Update JTable - Cell

i tried out the sample http://java.sun.com/docs/books/tutorial/uiswing/components/example-swing/TableDemo.java. if i enter a new value and klick into another cell of the table all works fine. if i click on the table header after editing the cell the old value appears in the cell. if i enter signs directly after the click on the table header the text appended to the old value of the edited cell.
i hope, anybody can help me.

Hmm, the suggestion given above appears to work when focus is gained on all other components, so the table header must have to logic to "cancel" cell editing. You can add your own MouseListener to "save" the edited data to the table header:
table.getTableHeader().addMouseListener( new MouseAdapter()
     public void mousePressed(MouseEvent e)
          JTableHeader header = (JTableHeader)e.getSource();
          JTable table = header.getTable();
          if (table.isEditing())
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});

Indeterminate JProgressBar inside JTable cell

I am able to put a JProgressBar inside a JTable cell, via a custom renderer to do so, however, I am unable to make the progress bar show the indeterminate animation. Any ideas? I calledbar.setIndeterminate( true ); and it doesn't seem to want to show. Is the JTable preventing it?
(should I include more of my code?)

Your JProgressBar is used to render the table cell only when that cell of the JTable needs to be rendered and the JProgressBar has no say in this.
I don't know why you would want to do this but to do this I would set up timer that fired a tree model event to say that the content of the cell had changed. This would trigger the cell to be re-painted. I think, but I can't be sure, that you will not be able to use
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Alfa numerical keypad issue after fp2 update: spe...

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Probably it's a stupid question but I have this problem:
I have a the necessity to build a JTable in which, when I edit a cell and I push a keyboard button, a new Frame opens to edit the content of the cell.
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Thanks

Hi there
Depending on your table model you should normally change the "cell value" of the tablemodel.
This could look like:
JTable table = new JTable();
TableModel model = table.getModel();
int rowIndex = 0, columnIndex = 0;
model.setValueAt("This is a test", rowIndex, columnIndex);
The tablemodel should then fire an event to the view (i.e. JTable) and the table should be updated.
Hope this helps you

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Hi. I have an ipod touch 4th generation, it's in perfectly good condition no cracks or anything. The issue is my ipod is locked and i'm not able to type in my passcode because the numeric keypad isn't working properly.For ex. when i hit 8 (which is the second number in my passcode) the number 5 type in. Also my home button isn't working. Hope that was specfic enough.. thanks!!

Place the iOS device in recovery mode with one of thes programs and then restore via iTunes
For PC
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If necessary:
Download QTMLClient.dll & iTunesMobileDevice.dll for RecBoot
For MAC or PC
The Firmware Umbrella - TinyUmbrella
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To restore from backup see:
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If you restore from iCloud backup the apps will be automatically downloaded. If you restore from iTunes backup the apps and music have to be in the iTunes library since synced media like apps and music are not included in the backup of the iOS device that iTunes makes.
You can redownload most iTunes purchases by:

Problem in event handling of combo box in JTable cell

Hi,
I have a combo box as an editor for a column cells in JTable. I have a event listener for this combo box. When ever I click on the JTable cell whose editor is combo box,
I get the following exception,
Exception occurred during event dispatching:
java.lang.NullPointerException
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     at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.mousePressed(Unknown Source)
     at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
     at java.awt.Component.processMouseEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
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     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
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     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
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     at java.awt.EventDispatchThread.run(Unknown Source)
Can any one tell me how to over come this problem.
Thanks,
Raghu

Here's an example of the model I used in my JTable. I've placed 2 comboBoxes with no problems.
Hope this helps.
public class FileModel5 extends AbstractTableModel
public boolean isEditable = false;
protected static int NUM_COLUMNS = 3;
// initialize number of rows to start out with ...
protected static int START_NUM_ROWS = 0;
protected int nextEmptyRow = 0;
protected int numRows = 0;
static final public String file = "File";
static final public String mailName = "Mail Id";
static final public String postName = "Post Office Id";
static final public String columnNames[] = {"File", "Mail Id", "Post Office Id"};
// List of data
protected Vector data = null;
public FileModel5()
data = new Vector();
public boolean isCellEditable(int rowIndex, int columnIndex)
// The 2nd & 3rd column or Value field is editable
if(isEditable)
if(columnIndex > 0)
return true;
return false;
* 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();
* Retrieves number of columns
public synchronized int getColumnCount()
return NUM_COLUMNS;
* Get a column name
public String getColumnName(int col)
return columnNames[col];
* Retrieves number of records
public synchronized int getRowCount()
if (numRows < START_NUM_ROWS)
return START_NUM_ROWS;
else
return numRows;
* Returns cell information of a record at location row,column
public synchronized Object getValueAt(int row, int column)
try
FileRecord5 p = (FileRecord5)data.elementAt(row);
switch (column)
case 0:
return (String)p.file;
case 1:
return (String)p.mailName;
case 2:
return (String)p.postName;
catch (Exception e)
return "";
public void setValueAt(Object aValue, int row, int column)
FileRecord5 arow = (FileRecord5)data.elementAt(row);
arow.setElementAt((String)aValue, column);
fireTableCellUpdated(row, column);
* Returns information of an entire record at location row
public synchronized FileRecord5 getRecordAt(int row) throws Exception
try
return (FileRecord5)data.elementAt(row);
catch (Exception e)
throw new Exception("Record not found");
* Used to add or update a record
* @param tableRecord
public synchronized void updateRecord(FileRecord5 tableRecord)
String file = tableRecord.file;
FileRecord5 p = null;
int index = -1;
boolean found = false;
boolean addedRow = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
{ //update
data.setElementAt(tableRecord, index);
else
if (numRows <= nextEmptyRow)
//add a row
numRows++;
addedRow = true;
index = nextEmptyRow;
data.addElement(tableRecord);
//Notify listeners that the data changed.
if (addedRow)
nextEmptyRow++;
fireTableRowsInserted(index, index);
else
fireTableRowsUpdated(index, index);
* Used to delete a record
public synchronized void deleteRecord(String file)
FileRecord5 p = null;
int index = -1;
boolean found = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
data.removeElementAt(i);
nextEmptyRow--;
numRows--;
fireTableRowsDeleted(START_NUM_ROWS, numRows);
* Clears all records
public synchronized void clear()
int oldNumRows = numRows;
numRows = START_NUM_ROWS;
data.removeAllElements();
nextEmptyRow = 0;
if (oldNumRows > START_NUM_ROWS)
fireTableRowsDeleted(START_NUM_ROWS, oldNumRows - 1);
fireTableRowsUpdated(0, START_NUM_ROWS - 1);
* Loads the values into the combo box within the table for mail id
public void setUpMailColumn(JTable mapTable, ArrayList mailList)
TableColumn col = mapTable.getColumnModel().getColumn(1);
javax.swing.JComboBox comboMail = new javax.swing.JComboBox();
int s = mailList.size();
for(int i=0; i<s; i++)
comboMail.addItem(mailList.get(i));
col.setCellEditor(new DefaultCellEditor(comboMail));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for mail Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Mail Id to see a list of choices");
* Loads the values into the combo box within the table for post office id
public void setUpPostColumn(JTable mapTable, ArrayList postList)
TableColumn col = mapTable.getColumnModel().getColumn(2);
javax.swing.JComboBox combo = new javax.swing.JComboBox();
int s = postList.size();
for(int i=0; i<s; i++)
combo.addItem(postList.get(i));
col.setCellEditor(new DefaultCellEditor(combo));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for post office Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Post Office Id to see a list of choices");
}

Way to listen for change in JTable cell?

I am having troubles trying to catch a key event while the user is entering text inside a given JTable cell (x/y location). The JTable only seems to manage String objects in it's cells so I can't place a JTextField in there with a KeyListener on it.
Currently, I can only get control of the application once the user has left the cell they are editing.
Does anyone have an example of a JTable 'cell KeyListener' scenario? At this point I want to see if I can print 'hello world' each time I type a character within a cell. Then I'll go from there....

If you want to know when the contents of a cell have been updated you should use a TableModelListener.
If you want to know when a character is added/removed from the cell editor then you need to first understand how this works with a simple text field.
Typically you would use a DocumentListener to receive notifies of a change to the text field. However, within the DocumentEvent you wouldn't be able to change the text field as this notification comes after the text field has already been updated.
If you need to ability to intercept changes to the text field before they happen, then you would need to use a DocumentFilter. An example of using a DocumentFilter is given in the Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html#filter]Text Component Features.
Once you get your regular text field working the way you want, the next step to create a DefaultCellEditor using this JTextField and use this editor in your JTable. The above tutorial also has a section on using editors in a table.

Updating JTable Contents

I'm having trouble refreshing a JTable after changing it's 2D Object array data. Perhaps this is a stupid question, but any advice would be appreciated.
Basically I've been building from the SimpleTableDemo.java file in the "How to Use Tables" tutorial. I set Object[][] data to a 2D Object array that is modified by other parts of my program.
I added the public void tableChanged(TableModelEvent e) function to detect data changes, displaying a simple System.out, but it never seems to get called.
Is there any way that the JTable can observe changes in the Object[][] data array and update it's self accordingly? I'm never sure if rows are being added or removed.
I hope that made sense, and thank-you in advance to anyone who replies.
-Arthur

Couple of things...
Whenever you change the contents of your TableModel you need to fire the appropriate event to get the JTable to update the viewed rows... in your case it sounds like you would have to call the "fireTableDataChanged()" method defined by AbstractTableModel so that your contents will be viewed.
Also... it is rare that you really need to update the entire contents of your table model, most the time it is more efficient to just update the cell or row your need and call the appropriate "fire..." method to update
Hope this helps
Josh Castagno
http://www.jdc-software.com

Update jtable cell via numeric keypad

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