How to have a combobox in JTable column header?

Any simple ways for doing this? I am trying to get a filter to a JTable, so that only the rows containing the selected value in that column would be shown.
I first need to get this combobox into the header of a column.

Thanks.
I have already tried with this way, but it was too long and complicated to implement into my file.
Could someone post the principles here.
Like this:
// create my combobox
JComboBox myBox = new JComboBox();
myBox.addItem("Cat");
myBox.addItem("Dog");
// put the combobox to column header
??? ANY CODE HERE ???
Tnx ahead!
OK!
AUlo

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I'd like to use JButtons as my JTable's column headers.
I built a JButton subclass which implemented TableCellRenderer and passed it to one of my table column's setHeaderRender method. The resulting header is a component that looks like a JButton but when clicked, it does not visually depress or fire any ActionEvents.

You might want to check this example and use it accordingly for your requirements.
http://www2.gol.com/users/tame/swing/examples/JTableExamples5.html
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Dear All,
How can I set up my JTable columns to have the amount the user specifies?
for example when the user types in 50 in JTextField 1 I want the JTables columns to then set to 50.
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lol
import javax.swing.*;
import javax.swing.table.TableModel;
import java.io.*;
import java.util.*;
import java.lang.*;
import java.awt.*;
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As you can see I have tried this, but no success.
If I am doing something wrong please accept my apology, and address me in the right direction.
Thanks
Lol
import javax.swing.*;
import javax.swing.table.TableModel;
import java.io.*;
import java.util.*;
import java.lang.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class si1 extends javax.swing.JFrame implements ActionListener {
 JTextField name = new JTextField(15);
 JTextField name1 = new JTextField(15);
 public si1() {
 super("DataBase Loader");
 setSize(1025,740);
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 JPanel pane = new JPanel();
 JPanel pane1 = new JPanel();
 JPanel pane2 = new JPanel();
 JPanel pane3 = new JPanel();
 JPanel pane4 = new JPanel();
 pane.setLayout(new GridLayout(20,1));
 pane1.setLayout(new BorderLayout());
 int j=10;
 String[][] data = new String[j][2];
 for (int k=0; k<j; k++){
 String[] row = {"",""};
 data[k] = row;
 String[] columnNames = {"First Name", "Last Name"};
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 JButton btn = new JButton("What are the names?");
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 btn.putClientProperty("DATABASE", perstab);
 pane1.add(new JPanel().add(btn), BorderLayout.SOUTH);
 pane2.add(name);
 pane3.add(name1);
 pane.add(pane2);
 pane.add(pane3);
 pane1.add(pane, BorderLayout.WEST);
 pane4.add(scrollPane);
 pane1.add(pane4, BorderLayout.CENTER);
 setContentPane(pane1);
 show();
 public static void main(String[] args) {
 si1 frame = new si1();
 frame.setVisible(true);
 public void actionPerformed(ActionEvent e) {
 JTable table = (JTable)((JButton)e.getSource()).getClientProperty("DATABASE");
 TableModel model = table.getModel();
 int count = model.getRowCount();
 String[] firstnames = new String[count];
 String[] lastnames = new String[count];
 for (int i=0; i < count; i++) {
 firstnames[i] = (String)model.getValueAt(i, 0);
 System.out.println("first name at row " + i + ": " + firstnames);
lastnames[i] = (String)model.getValueAt(i, 1);
System.out.println("lastname name at row " + i + ": " + lastnames[i]);

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thanks

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I'm looking for a way to have JTable column heading text
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[email protected]

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Edited by: user513776 on Jul 5, 2011 2:24 PM
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Hi there,
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Minal

Here's an example of the model I used in my JTable. Not the "getValueAt" method & "getRecordAt" method. You will have to have a Record object - but it only contains the attributes of an inserted record (with appropriate getters & setters). 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();
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// The 2nd & 3rd column or Value field is editable
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if(columnIndex > 0)
return true;
return false;
* JTable uses this method to determine the default renderer/
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* rather than a check box.
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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;
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boolean found = false;
boolean addedRow = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
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index = i;
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i++;
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{ //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);
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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;
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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)
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fireTableRowsUpdated(0, START_NUM_ROWS - 1);
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int s = mailList.size();
for(int i=0; i<s; i++)
comboMail.addItem(mailList.get(i));
col.setCellEditor(new DefaultCellEditor(comboMail));
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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");
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public void setUpPostColumn(JTable mapTable, ArrayList postList)
TableColumn col = mapTable.getColumnModel().getColumn(2);
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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");
}

How to change JTable column header text

How do you set the text in the JTable column headers? I know you can create a JTable specifying the text in an array:
<li>JTable(Object[][] rowData, Object[] columnNames)
But if you create the JTable specifying a TableModel,
<li>JTable(TableModel dm)
the header text defaults to "A", "B", "C", etc. I cannot figure out how to access the text in the header names so it can be changed to something useful. I know how to get the JTableHeader for the table, but it does not seem to have methods for actually setting header values.

I'm sure that model allows you to specify header values so you don't have to do so manually. I would be very surprised if it didn't override the default getColumnName() method to provide a reasonable names.She wasn't writing the class, but [url http://forums.oracle.com/forums/thread.jspa?messageID=9200751#9200751]outlining a design for me to implement. And, based on a previous comment I had made, I think she assumed I wanted the new design to look as much like the old as possible. There were no headers in the original design, which wasn't even a table.
Anyway, this works:
 final static String statisticsColumnNames[] = {
 "Type", "Count",
 "Red QE", "Green QE", "Blue QE", "Average QE",
 "Distance"
 qErrors = new QEBeanTableModel();
 JTable errorTable = new JTable(qErrors);
 TableColumnModel tcm = errorTable.getColumnModel();
 for (int col = 0; col < statisticsColumnNames.length; col++)
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It looks like setHeaderValue() on the TableColumn is what I was looking for.Again, only used if you are dynamically changing the values at run time or you don't like the defaults provided by the Bean-aware model.I coded the above before I read your last post. The QEBeanTableModel is extremely specific to my program. I.e. I cannot imagine it being used anywhere else. Would it still be better to implement a getColumnName() within the table model? Looking at your [url http://www.camick.com/java/source/RowTableModel.java]RowTableModel.java source, I can see that it would not be difficult to do so.
Just decided to add the getColumnName() method. This whole sub-project is based on implementing a clean modern design (and learning about Java Beans). You've clearly stated twice that the method I have implemented is for dynamic header values only, which has already answered what I asked last paragraph.

JTable column header to span multiple columns

Hi people. I've spent the last day trying to do this with no luck. Most of the links in the forum are old and don't exist any more and the ones that lead to some code end up not working on java 5 (I can compile and run but the result is not what I wanted)!
So my question is this, how do I have a column header that spans more than one column, which has individual column headers below it?
Thanks, Paul.
EDIT: I should point out that this is the place I've tried and although the screen shot of the first example looks exactly like what I want to do, it does not work as advertised. [http://www.crionics.com/products/opensource/faq/swing_ex/JTableExamples1.html]
Edited by: Boomah on 05-Nov-2008 15:08

Something like this?import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.TableColumnModelEvent;
import javax.swing.event.TableColumnModelListener;
import javax.swing.table.*;
public class MultiSpanHeader {
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 @Override
 public void run() {
 new MultiSpanHeader().makeUI();
 public void makeUI() {
 final JTable table = new JTable(5, 6);
 final JTableHeader header = table.getTableHeader();
 header.setReorderingAllowed(false);
 final TableColumnModel model = table.getColumnModel();
 Enumeration<TableColumn> enumColumns = model.getColumns();
 final List<TableColumn> columns = Collections.list(enumColumns);
 final JTable dummy = new JTable(0, 3);
 final JTableHeader dummyHeader = dummy.getTableHeader();
 dummyHeader.setReorderingAllowed(false);
 dummyHeader.setResizingAllowed(false);
 final TableColumnModel dummyModel = dummy.getColumnModel();
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 final List<TableColumn> dummyColumns = Collections.list(enumDummyColumns);
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 @Override
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 @Override
 public void columnMoved(TableColumnModelEvent e) {
 @Override
 public void columnMarginChanged(ChangeEvent e) {
 dummyColumns.get(0).setWidth(columns.get(0).getWidth());
 dummyColumns.get(1).setWidth(columns.get(1).getWidth() +
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 dummyColumns.get(2).setWidth(columns.get(3).getWidth() +
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 JScrollPane pane = new JScrollPane(table);
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 JFrame frame = new JFrame();
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 JPanel panel = new JPanel(new GridLayout(2, 1));
 panel.add(dummyHeader);
 panel.add(header);
 pane.getColumnHeader().setView(panel);
 frame.setLocationRelativeTo(null);
 frame.setVisible(true);
}Note: this is just presented as an idea, would need a lot of work to make it robust and flexible enough for practical use.
db

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i want to join 2 or more rows under a single column header. as shown "container details" is the column name with "h", "w", and "s" and the sub column names. so my header should contain all these four names and my 3 rows under h,w and s should be clubed under this container details.
anyone help me out. thanks in advance.
container details
| h | w | s

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I have a table with 4 columns, Can any one tell me how can i increase the text size and apply different fonts in webdynpro java application.
Thanks
Satish J

Hi Satish,
To expain it bit more clearly.
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There is no listener that reports this activity. The TableColumnModelListener can only tell you if columns change position or are added/removed from the column model.
To detect changes, you will need to use a brute force mechanism, namely, to extend the JTableHeader class just a bit.
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table.setModel(...);
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Mitch Goldstein
Author, Hardcore JFC (Cambridge Univ Press)
[email protected]

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This will make the text of ColumnHeader of type String and Length 40.
Hope it helps.
Regards,
Alka.

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======
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I have a requirement to show the picked value as the column header using SQL query.In sql*plus you can do
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new: SELECT empno "7934" FROM emp WHERE empno = 7934
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How to have a combobox in JTable column header?

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