Moving columns in a JTable

I'm having a problem with moving of columns by dragging the table header. The table header value moves but the information in the table cells below remain where they were. Has anyone come across anything like this before?
Could it be something to do with the way my tablemodel interacts with my tablesorter?

Cheers Richard,
I'm using TableSorter which is part of the TableSorterDemo in How To Use Tables in the Sun Java tutorial if you want to look - it works fine within the demo. I'm afraid I'm fairly new to java so I'm not sure where to look for the problem. I think I'll try using the default tablemodel, see if that works and then add stuff until it all goes wrong again! Is this sensible? Any more ideas?
Thomas

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How to forbid to moving columns in a JTable

Hi together,
i have one simple question. How can i forbid, that columns can be moved in my Jtable?
If anyone can help or may has a useful link, i would be glad.
thanks
BackUP

Hi,yourTable.getTableHeader() .setReorderingAllowed(false);

Moving columns in JTable

hi all
i'm having a slight problem after i've moved a column within my JTable, i need to reallocate the column index numbers. i'm using a sorter for the data, so when i move a column and select another column (or that one) it sorts a different column to the one selected based on the original (pre-move) indexes ( i do hope that makes some sense).
i have a mouseDragged listener which works fine when moving a column, i just now need to add the index changes for all columns to it but i keep coming up with very very bad code that doesn't work.
any suggestions would be most appreciated.
thanks heaps...
Takis

i've actually been fiddling with those and that is actually where my problem lies.
i use the following:
int viewColumn = columnModel.getColumnIndexAtX(e.getX());
int column = tableView.convertColumnIndexToModel(viewColumn);
the sorter then works on "column".
problem is, that when the column is moved, the viewColumn changes, but the column value remains the same. i've also tried sorting on the view column but then it gets even more confused.
i just can't seem to figure it out...
Takis

How to disable moving Columns in JTable

Hi,
How can I make sure that the columns in my JTable cannot be moved?
Any ideas?
thanks

How about:myTable.getTableHeader().setReorderingAllowed(false);

Looking for component: flexible rows like columns in a JTable

Hello,
I need a swing component to display several rows which can be moved up and down, the height resized, interchanged with the mouse like the columns in a JTable. But there is no need for columns. I think there is no standard swing component.
Any ideas, resource hints?
Thanks, Ulrich

One more piece of advice. It is not very easy to get "pre-written custom components". Most developers do things to meet their own needs and these may not be exactly what you are looking for. The best thing to do is to try to develop this yourself. It will give you loads of experience and in later programmes you may write, based on the experience you obtained from the "pain-staking" development process you'll know how to go round these problems quicker and may be able to help others also.
So just start writing some stuff. You may end up finishing sooner than you think. And remember forum members are always ready to help with problems (accompanied by minimal code examples of the actual problem).
ICE

Giving names to the columns in a JTable

Hi,
I am using JTable(int numRows, int numColumns) constructor to create a JTable. After I built my application I came to knw that I cannot change the column names. The JTable in my GUI will keep on changing and the no. of rows,columns and even the column names may also change. I just wanted to know what constructor I should shift to.
Thanks,
Adhiraj

I would use something like the following:
DefaultTableModel model = new DefaultTableModel(columnNames, rowCount);
JTable table = new JTable( model );
The following code gives some examples on using the DefaultTableModel to add rows and columns:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class TableRowColumn extends JFrame
     private final static String LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     JTable table;
     DefaultTableModel model;
     JPanel buttonPanel;
     JButton button;
     public TableRowColumn()
          // Create table
          Object[][] data = { {"1", "A"}, {"2", "B"}, {"3", "C"} };
          String[] columnNames = {"Number","Letter"};
          model = new DefaultTableModel(data, columnNames);
          table = new JTable(model);
          table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
          // Add table and a Button panel to the frame
          JScrollPane scrollPane = new JScrollPane( table );
          getContentPane().add( scrollPane );
          buttonPanel = new JPanel();
          getContentPane().add( buttonPanel, BorderLayout.SOUTH );
          button = new JButton( "Add Row" );
          buttonPanel.add( button );
          button.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                    model.addRow( createRow() );
                    int row = table.getRowCount() - 1;
                    table.changeSelection(row, 0, false, false);
                    table.requestFocusInWindow();
          button = new JButton( "Insert Row" );
          buttonPanel.add( button );
          button.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                    model.insertRow( 0, createRow() );
                    table.changeSelection(0, 0, false, false);
                    table.requestFocusInWindow();
          button = new JButton( "Empty Row" );
          buttonPanel.add( button );
          button.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                    model.setRowCount( model.getRowCount() + 1 );
                    int row = table.getRowCount() - 1;
                    table.changeSelection(row, 0, false, false);
                    table.requestFocusInWindow();
          button = new JButton( "Add Column" );
          buttonPanel.add( button );
          button.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                    String header = "Col" + (table.getColumnCount() + 1);
                    model.addColumn( header );
                    table.requestFocusInWindow();
          button = new JButton( "Add Column & Data" );
          buttonPanel.add( button );
          button.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                    String header = "Col" + (table.getColumnCount() + 1);
                    int rows = table.getRowCount();
                    String[] values = new String[rows];
                    for (int j = 0; j < rows; j++)
                         values[j] = Integer.toString(j);
                    model.addColumn( header, values );
                    table.requestFocusInWindow();
          button = new JButton( "Add Column - No Reordering" );
          buttonPanel.add( button );
          button.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                    // Use this method when you don't want existing columns
                    // to be rebuilt from the model.
                    // (ie. moved columns will not be reordered)
                    table.setAutoCreateColumnsFromModel( false );
                    String header = "Col" + (table.getColumnCount() + 1);
                    model.addColumn( header );
                    // AutoCreate is turned off so create table column here
                    TableColumn column = new TableColumn( table.getColumnCount() );
                    column.setHeaderValue( header );
                    table.addColumn( column );
                    // These won't work once setAutoCreate... has been set to false
                    buttonPanel.getComponent(3).setEnabled( false );
                    buttonPanel.getComponent(4).setEnabled( false );
                    table.requestFocusInWindow();
          button = new JButton( "Remove Last Column" );
          buttonPanel.add( button );
          button.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                    int columns = model.getColumnCount();
                    if (columns > 0)
                         if (!table.getAutoCreateColumnsFromModel())
                              int view =
                                   table.convertColumnIndexToView(columns - 1);
                              TableColumn column =
                                   table.getColumnModel().getColumn(view);
                              table.getColumnModel().removeColumn( column );
                         model.setColumnCount(columns - 1);
                    table.requestFocusInWindow();
     private Object[] createRow()
          Object[] newRow = new Object[2];
          int row = table.getRowCount() + 1;
          newRow[0] = Integer.toString( row );
          newRow[1] = LETTERS.substring(row-1, row);
          return newRow;
     public static void main(String[] args)
          TableRowColumn frame = new TableRowColumn();
          frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
          frame.pack();
          frame.setLocationRelativeTo( null );
          frame.setVisible(true);
}

How to get all the values in one column of a JTable

How to get all the values in one column of a JTable as a Collection of String.
I don;t want to write a for loop to say getValueAt(row, 1) eg for 2nd column.

I don;t want to write a for loop to say getValueAt(row, 1) eg for 2nd column. You could always write a custom TableModel that stores the data in the format you want it. It would probably be about 50 lines of code. Or you could write a loop in 3 lines of code. I'll let you decide which approach you want to take.

How can I add custom right-click-menu to column headers in JTable?

Can anyone point me to a topic on how to customize a popup menu for column headers in JTable? Specifically, I want to add things like "auto-size column" and "hide column".
Thanks,
Matt

Right-click on your table. Then go to Advanced->Runtime Shortcut Menu->Edit.
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How to create Hyperlink column in a JTable

Can anyone help in creating a hyperlink column in a JTable.
Thanks in advance,
Sridhar.

If the parent is an Applet it is very simple .
catch the mouse click on columns and execute the following code
String url = getValueAt(i,j);
getAppletContext().showDocument(new
URL(url ), "_blank");
thatz all .
if ur program is an application use this getRuntime.exec() and use parameters to rundll32.exe url and iexplore.exe in Windows platform,
if u have still doubts plz get back to me
Renjith K.V

How to fix the value of first column in the JTable in java swing for every

Hi ,
I have a swing page that have table panel in which there is a table of size 7x4 now when I click on the perticulat row then that row data will displayin the table like that the selected row become the second column in the new table and the fist column of this table will remain constant for all the entry but the second column update according to the roe which is selected .How it is possible .
Thanks in Advace,
anu

One thing you can do is to prevent the user from editing that column and programatically supply the values of that column yourself.
JTable table = new JTable() {
   public boolean isCellEditable(int row, int col) {
       if(col == 0) {
          return false;
       return super.isCellEditable(row, col);
};This allows you to prevent the user from editing the column information so you can supply some sort of a default value for the column always
ICE

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,
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Moving columns in a JTable

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