Context Help in diferents Columns in a JTable

I want to put Context Help in the diferents columns in a JTable (in columns, in headers or cells); but I don't know how I can do it.
Please, if somebody can help me, or simply say me that this is not possible (if is really impossible).

Carlos,
You can write your own F1 listener for JTable (or if you prefer a right click help menu option then a mouse listener). In the listener determine what cell has focus or is clicked over. From this generate a help topicID. Then call showTopic on the CSHManager or Help.
Note the table has an editor component (e.g., JTextField), the make sure that the correct topicID is associated with this editor component.
Cheers,
Craig Cummings.
Oracle Help Team

Similar Messages

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

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

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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.
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How to set a JRadioButton as a column in a JTable

Hello Friends,
I need a help in JTable.
I want to have a Radio button as a column of a JTable.(The Other Columns should be Strings).
The heading of the Column which has the RadioButton is "Select" which means that I can select only one radiobutton at a time.
Could you please give me a solution on this.
I would appreciate if u give me the code for this, as it is very urgent.
Thanks in Advance,
Regards,
Vijayakannan

Hi,
use a TableCellRenderer and CellEditor as described in http://java.sun.com/docs/books/tutorial/uiswing/components/table.html
Propably you need to track the selected button yourself, e.g. by using an int value representing the row selected.

Adding mouse listener to the column header of a column in a JTable

Hi
I want to add a mouse listener to the column header of the 3rd column in a JTable. I dont find any appropriate method to do this. The code I have written to do this is below. But on using this code, the mouselistener is invoked if I click on any column header. Can anyone please help me to fix this.
table.getTableHeader().addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
/* some actions */
}

      table.getTableHeader().addMouseListener(new MouseAdapter(){
           public void mousePressed(MouseEvent me) {
               int tableColumn =table.columnAtPoint(me.getPoint());//it returns the column index
        });

Setting the Size of a Column in a JTable

Hi there,
does anybody knows a way how to set the size of a specified column in a JTable without changinge the size of the other columns?
thx anyway
Errraddicator

You've got to change the JTable's column resizing policy to prevent the other columns resizing:
JTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF)Otherwise all the columns will be adjusted to fit into the width of the table - changing one column would have to result in at least one other column changing!
Hope this helps.

How can I use a column header to select columns in a JTable?

Hello,
I've been working for ages on this, but I still can't come up with a suitable solution. What I want to be able to do is select a column header from a JTable, which in turn would select the corresponding column in my JTable. I cant seem to do this with a mouse listener, and I can't see how to toggle the buttons of the header either.
Any help would be gratefully appreciated.
Mike

I have both row and columns selected depending on what you do in the JTable. Here's my code:
where you init your JTable add:
addressTable = new JTable(addressTableModel, addressTableColumnModel);
JTableHeader th = addressTable.getTableHeader();
th.addMouseListener(new tableHeaderMouseAdapter(addressTable));
addressTable.getSelectionModel().addListSelectionListener(new selectionListener(addressTable));
addressTable.setColumnSelectionAllowed(true);
tableHeaderMouseAdapter looks like this (it should look familiar):
private class tableMouseAdapter extends MouseAdapter
     private JTable tableView;
     public tableMouseAdapter(JTable newTableView)
          tableView = newTableView;
     public void mouseClicked(MouseEvent e)
          int selectedRow = tableView.getSelectedRow();
          if ((e.getClickCount() == 1) && (selectedRow != -1))
               tableView.clearSelection();
               tableView.setRowSelectionInterval(selectedRow, selectedRow);
               tableView.setColumnSelectionInterval(0, tableView.getColumnModel().getColumnCount() - 1);
selectionListener looks like this:
private class selectionListener implements ListSelectionListener
     private JTable tableView;
     private boolean changingSelection;
     public selectionListener(JTable newTableView)
          tableView = newTableView;
          changingSelection = false;
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          if ((!changingSelection) && (tableView.getSelectedColumnCount() < tableView.getColumnCount()) && (tableView.getSelectedRowCount() < tableView.getRowCount()))
               changingSelection = true;
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               if (selectedRow >= 0)
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               tableView.setColumnSelectionInterval(0, tableView.getColumnModel().getColumnCount() - 1);
               changingSelection = false;
I'm sure there is a better way to do this, but it's the first thing I could get to work.
disclamer:
Use this code at your own risk. I make no claims about this code whatsoever.

Can i stop the columns in a JTable from re-ordering?

Hi,
As we know, JTable by default allows re-ordering of the columns within it.
I mean to say that the columns in a JTable can be interchanged, by drag and drop utility.
I want to refrain my JTable from doing so.
Can someone please suggest me how can i do this?
Thanx in advance :)
Regards,
Archana

Thank you :)
This did solve my problem of columns getting re-ordered in my JTable.
But i am facing one more problem now :(
I sort my JTable by clicking on the JTableHeader.
Clicking on the column header of any one of the columns of the JTable, sorts all entries in either ascending or descending order.
This is not happening.:(
Can someone please help me out?
Thanx in advance :)
Regards,
Archana

How can I add new row/column into existing jTable?

Hi add!
Can you help me how can I add new row/column into existing jTable?
Tnx in adv!

e.g
Create two buttons inside the Table ( "Add New Row" ) and ("Add new Column")
their handlers are:
add new row:
//i supose u already have
DefaultTabelModel tablemodel = new DefaultTableModel(rowdata, columnNames);
//and
   JTabel jtable = new JTable(tablemodel);
// Handler (row)
jbtAddRow.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e) {
      if(jtable.getSelectedRow() >= 0 )
          tablemodel.insertRow(jtable.getSelectedRow(), new java.util.Vector());
       else
            tablemodel.addRow(new java.util.Vector());
    });to add new columns its the same but inside actionPerformed method:
ask for e.g "Whats the name for the new column"
then,
   tablemodel.addColumn(nameOfColumn, new java.util.Vector());   Joao
Message was edited by:
Java__Estudante

How to disable/enable the cells for editing column wise in JTable in java?

Hi All,
Can any one tell me how to disable the cells for editing by column wise in JTable?
Here depending upon the radio button selected, I need 2 disable some columns for editing
and enable some columns for editing?
how can I do tat using JAVA?
Any sample code is of great help to me.
Thanks in Advance

http://java.sun.com/docs/books/tutorial/uiswing/components/table.html
~

Hiding columns of a JTable

I want to hide some of the columns of my JTable. Plz tell me how to do it?
Thanks in advance

Alternatively, remove those columns from the table's columnModel.Definitely the preferred approach.
Wouldn't you still have to modify the TableModel so that the getValueAt method doesn't return the wrong value?No, the view of the table is not necessarily the same as the order of the data in the TableModel. What happens, for example when a column of the table is reordered? Well, each TableColumn contains a reference to a specific column in the TableModel. So the TableColumnModel is used by the table to control the view of the table and the TableColumn will get the data from the correct column. This way you can reorder TableColumns or remove TableColumns withouth affecting the TableModel only the view of the table.
My FixedColumnScrollPane example uses this feature:
http://forum.java.sun.com/thread.jspa?forumID=257&threadID=500055
By the way, when you use the getValueAt(...) method you have to be carefull which index you use for the column.
a) Do you want the first column viewable in the table, then just use the column
b) Do you want the first column from the TableModel. In this case you have some helper methods (in case columns have been reordered or removed):
convertColumnIndexToModel()
convertColumnIndexToView()

Problem in updating first column header in JTable

hi
I am using JTable in my application. I want to change first column name of JTable every time when a JList is selected. I am using DefaultTableModel for JTable. I added first column in Constructor and another in a method. I have to edit only first column header. How can i do this???
I used this code but it is not working.
table.getColumnModel().getColumn(0).setHeaderValue("Name of column");
table.getTableHeader().resizeAndRepaint();
Your help will be appreciated.
Thanks in advance
Sonal

table.getColumnModel().getColumn(0).setHeaderValue("Name of column");
table.getTableHeader().repaint();Works for me so post a SSCCE ( http://www.sscce.org/ ) that shows the problem.

How can I set column headers in JTable?

I only want to set 3 column headers in JTable (without TabelModel). Can you help me?

Hello dn77,
Here's is a little sample I just rigged up, hope it helps.
import java.awt.*;
import javax.swing.*;
public class TestOne{
     public static void main(String arg[]) {
          Object rows[][] = {
               {"One", "1", "I"},
               {"Two", "2", "II"},
               {"Three", "3", "III"},
               {"Four", "4", "IV"},
               {"Five", "5", "V"},
               {"Six", "6", "VI"},
               {"Seven", "7", "VII"},
               {"Eight", "8", "VIII"},
               {"Nine", "9", "IX"},
               {"Ten", "10", "X"},
               {"Eleven", "11", "XI"},
               {"Twelve", "12", "XII"},
               {"Thirteen", "13", "XIII"},
               {"Fourteen", "14", "XIV"},
               {"Fifteen", "15", "XV"},
               {"Sixteen", "16", "XVI"},
               {"Seventeen", "17", "XVII"},
               {"Eighteen", "18", "XVIII"},
               {"Nineteen", "19", "XIX"},
               {"Twenty", "20", "XX"}
          String headers[] = {"Notation", "Decimal", "Roman"};
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          JTable table = new JTable(rows, headers);
          JScrollPane scrollPane = new JScrollPane(table);
          frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
          frame.setSize(300,150);
          frame.setVisible(true);
}-Merwyn,
Developer Technical Support,
http://www.sun.com/developers/support.

Setting column names in JTable

can n e one tell me how to set column names for JTable..
i don't wanna use the JTable constructor ... cuz
my column names change...

this is how i did it once...hope it helps
Vector columnNames = new Vector();
JTable previewTable = new JTable();
previewTable.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
previewScrollPane.getViewport().add(previewTable, null);
int colNo = 2; // i am displaying 2 columns
columnNames.add("Col One");
columnNames.add("Col Two");
String[] tableColumnNames = {"Id Name","Type"};
DefaultTableModel aModel = (DefaultTableModel) previewTable.getModel();
aModel.setColumnIdentifiers(tableColumnNames);
//add data to the table
.//loop
aModel.addRow(objects);
previewTable.revalidate();
previewTable.setModel(aModel);

Context Help in diferents Columns in a JTable

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