Event for JTable column move

Can someone tell me which event is fired when a column is moved (dragging from one location to the next) in a JTable. I need to know when the move ends.
Thanks

RTM javax.swing.event.TableColumnModelEvent

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JTable - column move and column spacing

Hi,
Can someone please show me how to prevent users from being able to move columns. I am not finding any code to do this.
Also, how do I set fixed width for columns. I am using vectors to populate the data
Much appreciated

Hi,
This is a beginner level question and you should have been able to figure this out yourself.
Have an array with size equal to the number of columns you have and store in each element of the array the size you want for the column. Then your code should be easy.
// For a table with 4 columns
double [] columnWidths = { 100.0, 109.0, 120.0, 95.0 };
TableColumnModel columnModel = jTable.getColumnModel();
               for ( int k = 0, count = columnModel.getColumnCount(); k < count; k++ ) {
                   TableColumn column = columnModel.getColumn( k );
                   // Do you mean this?
                  column.setResizable( true );
                   // or this ?
                                                                               column.setMinWidth( columnWidths[k] );
                   column.setMaxWidth( columnWidths[k] );
               cheers,
vidyut
http://www.bonanzasoft.com

Click event for single column in DataGrid

I can add an event listener to a DataGrid of type
ListEvent.ITEM_CLICK, which is triggered when the user clicks any
part of an entire row in a DataGrid. I want to trigger a click
event for just one column. I only want to run a function when the
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trigger the event if they click in any other column. Any help would
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Accessing the event.target returns the entire DataGrid, not
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JTable column movement and scroll bar

Hello:
I have a JTable with about 30-40 columns. Sometimes I would like to drag the column from rightmost to closer to the left end. I am not able to do that in one shot. and instead have to do it in multiple steps. Is there a way for the scroll bar to sort of move alongside the column as I drag it along?

i dont know if there is way off hand. But you can put your own mouseListener of the JScrollPane and i am sure there is some method to check if you are dragging the JTable and if you are move the JScrollBar in the direction.
I think that you are going to have to make you own implementation of this.
David

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All,
I would like to display some data on double_click a selected row from the JTable. How do I code the double_click event in the following program. Please advise.
Here is the code:
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
class TableTest extends JFrame {
MyTableModel myModel;
JTable table;
JButton button;
JButton buttonQuery;
int count = 0;
public TableTest() {
myModel = new MyTableModel();
table = new JTable(myModel);
table.setPreferredScrollableViewportSize(new Dimension(500, 200));
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this window.
getContentPane().add(scrollPane, BorderLayout.CENTER);
getContentPane().add(button = new JButton("Add Row"),
BorderLayout.SOUTH);
getContentPane().add(buttonQuery = new JButton("Query"), BorderLayout.NORTH);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Object [] aRow = new Object [8];
for (int i=0; i<5; i++) {
aRow = new Integer(count+i);
myModel.addRow(aRow);
count += 10;
buttonQuery.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println(myModel.getRowCount());
System.out.println(myModel.getValueAt(1, 3));
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
class MyTableModel extends AbstractTableModel {
protected final String[] headers =
{ "No", "Vehicle No", "Date of Loss", "Image Type", "Image Description", "Claim Type", "Scan Date", "User Id" };
Vector data;
MyTableModel() {
data = new Vector();
public int getColumnCount() {
return headers.length;
public int getRowCount() {
return data.size();
public Object getValueAt(int row, int col) {
if (row < data.size() && col < 8) {
Object [] aRow = (Object []) data.elementAt(row);
return aRow[col];
} else {
return null;
public void addRow(Object [] aRow) {
data.addElement(aRow);
fireTableRowsInserted(data.size()-1, data.size()-1);
public static void main(String[] args) {
TableTest frame = new TableTest();
frame.pack();
frame.setVisible(true);
}

Thanks, but I get 1 error:
'Cannot resolve symbol' -class MouseInputAdapter
import java.awt.event.MouseAdapter;
Also say if I need to get 'column data' from selected
row, what will be the command like ?
int col = table.columnAtPoint(p);>
Best Regards

Maximum Allowed Text Length for JTable Column

Can you please help me with a JTable Doubt
How do I set the Maximum Allowed Text Length for a Particular Column of a JTable?

Thanks a lot mate. I used the following
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               public void replace(DocumentFilter.FilterBypass fb, int offset, int length,
                         String text, AttributeSet attr) throws BadLocationException {
                    if ((fb.getDocument().getLength() + length) < 10)
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                         Toolkit.getDefaultToolkit().beep();
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Hi, all
I wrote some code tried to show tooltip on jtable's specific column, but it won't work. The code looks like this:
Vector tooltip=new Vector();
int i;
for(i=0;i<10;i++) {
tooltip.add("<some tooltip string");
for(i=0;i<tooltip.size();i++) {
System.out.println((String)tooltip.get(i));
((DefaultTableCellRenderer)demoTable.getCellRenderer(i,1)).setToolTipText((String)tooltip.get(i));
In the later loop, System.out.println show exactly tooltip text. But when the table show up, all tooltip text show the same text, the last string stored in Vector tooltip. What's wrong with the above code?
Thanks,

er - I think this is cos that only one renderer is used, and it's reused for each component.
if you subclass the DefaultTableCellRenderer, and in the getTableCellRendererComponent() and then set the tooltiptext in there in that method.
otherwise you will get the incorrect info.
(I think that's right anyway)
Phil J

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When a cell in a JTable is getting edited, how can I get notified of the focusLost event? I added the focus listener using JTable.addFocusListener, but the focusLost of the listener is not called when a cell inside the table is getting edited (it works fine otherwise). I am aware of the client property terminateEditOnFocusLost to solve this problem in 1.4 but I can't use it since I am still on 1.3.1_04.
Suggestions welcome.

http://forum.java.sun.com/thread.jsp?forum=57&thread=431440

How to cancel datagrid itemclick event for one column with a button control

I have a datagrid that displays rows of data that can be
edited and deleted. To edit the user clicks on a row and the row
data appears above in some text fields and user can edit data then
clicks save and datagrid is refreshed with updated data. Also on
each row is a delete button. This button will delete the current
row of data. The conflict is when user clicks on the delete button
the itemclick event of row is activated and edit fields get filled
and then data row is deleted. I can create some very inefficient
code around this, but i rather not. What I would like to do is
cancel the itemclick event in the delete button column so the
itemclick event never happens when click on the button. Is this
possible?

Just ran across this problem myself. My simple approach is to check the columnIndex in the ListEvent that is passed on itemClick.

Help for adjusting columns of a JTAble in a Table Model

Hello community,
In order to have a good display of by DataBase in a JTable, I've wrote some code to adjust columns in function of datas. Those datas are displayed with a TableModel ( which I've declared in a class JDBCAdapter ).
When I start my application, I call adjustColumns(), and all is great but when I add information to my DB and display it, the columns of my JTable return to default width...
So I want to incorporate my function adjustColumns in my TableModel, and I need help...
     void adjustColumns()
     // Ajuste les colonnes aux donnes pour que tout soit visible
     int nbRow,nbCol;
     nbRow = JTable1.getRowCount();
     nbCol = test.getColumnCount();
     for ( int i = 0; i < nbCol; i++ )
     com.sun.java.swing.table.TableColumn column = null;
     column = JTable1.getColumnModel().getColumn(i);
     int dataLength = 0;
     for ( int j = 0; j< nbRow; j++ )
     FontMetrics fm;
     int dataLengthTmp;
     String valueTable;
     fm = JTable1.getFontMetrics(JTable1.getFont());
     if ( test.getValueAt(j, i) == null )
     System.out.println("Valeur nulle...");
     dataLengthTmp = 0;
     else
     valueTable = test.getValueAt(j, i).toString();
     dataLengthTmp = fm.stringWidth(valueTable);
     System.out.println(valueTable + " = " + dataLengthTmp);
     if ( dataLengthTmp > dataLength )
     dataLength = dataLengthTmp;
     if ( dataLength != 0 )
column.setWidth(dataLength + 5);
else
column.sizeWidthToFit();
JTable1.setModel(test);
JTable1.repaint();
import java.util.Vector;
import java.sql.*;
import com.sun.java.swing.table.AbstractTableModel;
import com.sun.java.swing.event.TableModelEvent;
public class JDBCAdapter extends AbstractTableModel {
Connection connection;
Statement statement;
ResultSet resultSet;
String[] columnNames = {};
Vector rows = new Vector();
ResultSetMetaData metaData;
public JDBCAdapter(String url, String driverName,
String user, String passwd) {
try {
Class.forName(driverName);
System.out.println("Ouverture de la connexion a la base de donnee...");
connection = DriverManager.getConnection(url, user, passwd);
statement = connection.createStatement();
catch (ClassNotFoundException ex) {
System.err.println("Cannot find the database driver classes.");
System.err.println(ex);
catch (SQLException ex) {
System.err.println("Cannot connect to this database.");
System.err.println(ex);
public void executeQuery(String query) {
if (connection == null || statement == null) {
System.err.println("There is no database to execute the query.");
return;
try {
resultSet = statement.executeQuery(query);
metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
columnNames = new String[numberOfColumns];
// Get the column names and cache them.
// Then we can close the connection.
for(int column = 0; column < numberOfColumns; column++) {
columnNames[column] = metaData.getColumnLabel(column+1);
// Get all rows.
rows = new Vector();
while (resultSet.next()) {
Vector newRow = new Vector();
for (int i = 1; i <= getColumnCount(); i++) {
newRow.addElement(resultSet.getObject(i));
rows.addElement(newRow);
// close(); Need to copy the metaData, bug in jdbc:odbc driver.
fireTableChanged(null); // Tell the listeners a new table has arrived.
catch (SQLException ex) {
System.err.println(ex+" query = "+query);
public void executeUpdate(String query) {
if (connection == null || statement == null) {
System.err.println("There is no database to execute the query.");
return;
try {
statement.executeUpdate(query);
// close(); Need to copy the metaData, bug in jdbc:odbc driver.
fireTableChanged(null); // Tell the listeners a new table has arrived.
catch (SQLException ex) {
System.err.println(ex+" query = "+query);
public void close() throws SQLException {
System.out.println("Fermeture de la connection a la base de donnee... Bye !");
resultSet.close();
statement.close();
connection.close();
protected void finalize() throws Throwable {
close();
super.finalize();
// Implementation of the TableModel Interface
// MetaData
public String getColumnName(int column) {
if (columnNames[column] != null) {
return columnNames[column];
} else {
return "";
public Class getColumnClass(int column) {
int type;
try {
type = metaData.getColumnType(column+1);
catch (SQLException e) {
return super.getColumnClass(column);
switch(type) {
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
return String.class;
case Types.BIT:
return Boolean.class;
case Types.TINYINT:
case Types.SMALLINT:
case Types.INTEGER:
return Integer.class;
case Types.BIGINT:
return Long.class;
case Types.FLOAT:
case Types.DOUBLE:
return Double.class;
case Types.DATE:
return java.sql.Date.class;
default:
return Object.class;
public boolean isCellEditable(int row, int column) {
try {
return metaData.isWritable(column+1);
catch (SQLException e) {
return false;
public int getColumnCount() {
return columnNames.length;
// Data methods
public int getRowCount() {
return rows.size();
public Object getValueAt(int aRow, int aColumn) {
Vector row = (Vector)rows.elementAt(aRow);
return row.elementAt(aColumn);
public String dbRepresentation(int column, Object value) {
int type;
if (value == null) {
return "null";
try {
type = metaData.getColumnType(column+1);
catch (SQLException e) {
return value.toString();
switch(type) {
case Types.INTEGER:
case Types.DOUBLE:
case Types.FLOAT:
return value.toString();
case Types.BIT:
return ((Boolean)value).booleanValue() ? "1" : "0";
case Types.DATE:
return value.toString(); // This will need some conversion.
default:
return "\""+value.toString()+"\"";
public void setValueAt(Object value, int row, int column) {
try {
String tableName = metaData.getTableName(column+1);
// Some of the drivers seem buggy, tableName should not be null.
if (tableName == null) {
System.out.println("Table name returned null.");
String columnName = getColumnName(column);
String query =
"update "+tableName+
" set "+columnName+" = "+dbRepresentation(column, value)+
" where ";
// We don't have a model of the schema so we don't know the
// primary keys or which columns to lock on. To demonstrate
// that editing is possible, we'll just lock on everything.
for(int col = 0; col<getColumnCount(); col++) {
String colName = getColumnName(col);
if (colName.equals("")) {
continue;
if (col != 0) {
query = query + " and ";
query = query + colName +" = "+
dbRepresentation(col, getValueAt(row, col));
System.out.println(query);
System.out.println("Not sending update to database");
// statement.executeQuery(query);
catch (SQLException e) {
// e.printStackTrace();
System.err.println("Update failed");
Vector dataRow = (Vector)rows.elementAt(row);
dataRow.setElementAt(value, column);
Thanks to help me.

Hi,
OK. I have read your code sample again. It looks like the JDBCAdapter class is reloading table data in the executeQuery method. Why not call adjustColumns at the end of this method after the new rows and columns are loaded? Perhaps it also should be called at the end of executeUpdate. Have you tried doing that?
I would still set
JTable1.setAutoCreateColumnsFromModel (false); to prevent Java from readjusting the size automatically at some other time.
regards,
Terry

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hi
I need to create a JTable with different number of rows for different columns...
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Event for JTable column move

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