Customize jtable rows

Hi:
I have been trying to make my table rows display different colors. Basically, it works already. But there is a weird aspect I don't quite understand; here is what I did:
I wrote a CellRenderer by extending JLabel and implementing TableCellRenderer; in the CellRenderer, I override the getTableCellRendererComponent method; in this method, I did all my row updating stuff; I also assigned this CellRenderer to each of my table's columns;
The weird part is, everytime I update my table (such as adding rows), I must RE-assign the CellRenderers to my columns; otherwise, the rows do not get customized like the way i want them to. Since the CellRenderers are assigned to each column , why does it matter when new rows are added? I don't quite understand that.
Thanks

You have to modify the underlying TableModel and implement the listener mechanism necessary for that. AFAIK, the default JTable is quite dumb and can't do anything,

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Add JTable Row Headers At The End Of The Rows(At Right)?

hi all
i got this example for adding JTable Row Headers,but it adds the headers at the left(beginning of the row)
and i want to add the headers at the end of the row(at right),any ideas how to do that?
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.AbstractListModel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
* @version 1.0 11/09/98
class RowHeaderRenderer extends JLabel implements ListCellRenderer {
RowHeaderRenderer(JTable table) {
    JTableHeader header = table.getTableHeader();
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public static void main(String[] args) {
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fixed by:
list.setBackground(table.getTableHeader().getBackground());here's the full code:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.ComponentOrientation;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
* @version 1.0 11/09/98
class RowHeaderRenderer extends JLabel implements ListCellRenderer {
JTable table;
RowHeaderRenderer(JTable table) {
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    JTableHeader header = table.getTableHeader();
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    setBorder(UIManager.getBorder("TableHeader.cellBorder"));
    setHorizontalAlignment(CENTER);
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    setBackground(header.getBackground());
    setFont(header.getFont());
public Component getListCellRendererComponent(JList list, Object value,
      int index, boolean isSelected, boolean cellHasFocus) {
    list.setBackground(table.getTableHeader().getBackground());
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class RowHeaderExample extends JFrame {
public RowHeaderExample() {
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    setLocationRelativeTo(null);
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    lstModel.addElement("Row 1");
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    lstModel.addElement("Row 3");
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    JTable table = new JTable(dm);
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    scroll.setRowHeaderView(rowHeader);
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        System.exit(0);
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}

Grouping and UnGrouping of JTable Rows?

Hi,
Has somebody done Grouping and UnGrouping of JTable Rows as we find in MS-Excel.
Thanks & regards
blue

Hi,
Have anyone done something like this.
If u r not clear about the requirement:
Please see the screenshot uploaded at below url:
[http://www.geocities.com/coolneela/GroupableTable.JPG]
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Hi all,
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In the future, please post Swing questions to the Swing forum: http://forum.java.sun.com/forum.jspa?forumID=57
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Getting ClassCastException When Trying To Color JTable Row?

hi there
i'm trying to set color for JTable Rows Using the method prepareRenderer
and get the values of the second column which contains integer values
and if it contain 0 integer value set the color row as red
its already works and the row with 0 is set to red but when i try to select any cell in the table
i'm getting
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integerat prepareRenderer
although the second row which i'm trying to test it's values is Integer not String????????????
here's the code:
import javax.swing.border.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.JFrame;
public class Column_Filter {
static JTable table;
static DefaultTableModel dtm;
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         ,{"b",new Integer(7),new Integer(400)}
         ,{"c",new Integer(0),new Integer(100)}
         ,{"d",new Integer(8),new Integer(800)}
         ,{"e",new Integer(3),new Integer(300)}
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                         if(type!=null)
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         col2.setCellEditor(new TableEditor());
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                java.lang.String.class, java.lang.String.class,java.lang.String.class
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                return types [columnIndex];
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                if(!editingValue.equals("")){
             try
            int i = Integer.parseInt(editingValue);
            catch(NumberFormatException nfe)
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            JOptionPane.showMessageDialog(null,"Data Input Error","Error",JOptionPane.ERROR_MESSAGE);
            return false;
                else{
                 getComponent().requestFocusInWindow();
                 fireEditingCanceled();
                 JOptionPane.showMessageDialog(null,"Data Input Error","Error",JOptionPane.ERROR_MESSAGE);
              return false;
               return super.stopCellEditing();
               public Component getTableCellEditorComponent(
               JTable table, Object value, boolean isSelected, int row, int column)
               Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
               ((JComponent)c).setBorder(new LineBorder(Color.BLACK));
               return c;
     }

hi again camickr
i changed the stopCellEditing as you mentioned
changed the getCellEditorValue to return an integer
and give exception and error message if the value can't be converted into integer(non numeric)
but the problem is when i run the program and change the value in any cell with numeric values
or with non numeric or not changing the value and press enter
it give the error message meaning it cannot convert the value to integer
even if enter an int or don't change the value ????????
here's what i did
import javax.swing.border.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.JFrame;
public class Column_Filter {
static JTable table;
static DefaultTableModel dtm;
    public static void main(String[] args) {
         String[]columns={"Name","Number","Price"};
         Object[][]data={ {"a",new Integer(5),new Integer(200)}
         ,{"b",new Integer(7),new Integer(400)}
         ,{"c",new Integer(0),new Integer(100)}
         ,{"d",new Integer(8),new Integer(800)}
         ,{"e",new Integer(3),new Integer(300)}
         dtm=new DefaultTableModel(data,columns);
                    table=new JTable(dtm){
                  public Class getColumnClass(int column)
                    return getValueAt(0, column).getClass();
                         public Component prepareRenderer(TableCellRenderer renderer, int row, int column)
                    Component c = super.prepareRenderer(renderer, row, column);
                    if (!c.getBackground().equals(getSelectionBackground()))
                         Integer type = (Integer)getModel().getValueAt(row, 1);
                         c.setBackground(type==0 ? Color.RED : Color.WHITE );
                    return c;
         TableColumnModel columnModel = table.getColumnModel();
         TableColumn col1 = columnModel.getColumn(1);
         col1.setCellEditor(new TableEditor());
         TableColumn col2 = columnModel.getColumn(2);
         col2.setCellEditor(new TableEditor());
         table.setPreferredScrollableViewportSize(new Dimension(280,160));
         JScrollPane scroll=new JScrollPane(table);
         JLabel label=new JLabel("Column Stuff",JLabel.CENTER);
         JPanel panel=new JPanel();
         panel.add(scroll);
        JFrame frame=new JFrame("Column Stuff");
        frame.add(label,BorderLayout.NORTH);
        frame.add(panel,BorderLayout.CENTER);
        frame.setSize(300,300);
        frame.setResizable(false);
        frame.setVisible(true);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
             table=new JTable();
               table.setModel(new DefaultTableModel(new Object [][][] {},new String [] {"Name", "Number","Price"}) {
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.Integer.class,java.lang.Integer.class
            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
      class TableEditor extends DefaultCellEditor
          TableEditor()
               super( new JTextField() );
            setClickCountToStart(0);
          public boolean stopCellEditing()
               try
                    Integer editingValue = (Integer)getCellEditorValue();
               catch(ClassCastException exception)
           //when i enter any value in any cell this code is executed even i enter an int or don't change the value
            ((JComponent)getComponent()).setBorder(new LineBorder(Color.red));
            getComponent().requestFocusInWindow();
            JOptionPane.showMessageDialog(null,"Data Input Error","Error",JOptionPane.ERROR_MESSAGE);
            return false;
               return super.stopCellEditing();
               public Component getTableCellEditorComponent(
               JTable table, Object value, boolean isSelected, int row, int column)
               Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
               ((JComponent)c).setBorder(new LineBorder(Color.BLACK));
               return c;
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How to get String form java JTable row?

Hello everybody,
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I found solution:
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Changing JTable Row Color OnMouseOver

Hello everybody,
is it possible to change JTable Row Color when Mouse passes over it ??
THanks!

Yes...
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Hi!
Is it possible to change dinamically and automatically JTable row height depending on a cell content to display it correctlly wraping the text?
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Thanks!

This link might help:
http://www.javaspecialists.co.za/archive/GUI.html

How to get event from selected JTable row

Whenever a JTable row is selected, i want to get an event to get the row index of the selected row and read the row data. Which listenere do i have to implement and where is the correspoinding addXXXListener() method in JTable?

here ya go...
<table>.getSelectionModel().addListSelectionListener(...);Josh Castagno
http://www.jdc-software.com

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i need to make a jtables rows and columns to not be editable, but i also need it to be able to be selectable. i know one way to do it is to extend defaulttablemodel and overwrite the iscelleditable method, but the problem is that i'm already extending jframe. is there any other way to do this keeping jframe extended, because i need it to be extended?
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JTable table = new JTable(..){
public boolean isCellEditable(int row, int column){
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JTable row filtering

Hi -
Does anyone have any samples / pointers on implementing custom exclusion filtering of rows in a JTable? I understand that I would use a 'middle' model layer similar to a sortable model, but am having difficulty getting my arms around how to write the model to allow the filtering to be customizable? (i.e. the user could decide to see all rows of a Person table, whose last names are between A and D, but then could turn around and perform another filter to see only rows of Person's between the ages of 10-25.).
Thanks,
Kelly

I've never used them for filtering, but I think the couple TableMap/TableSorter can help you.
I've used for sorting purpose, and they work properly.
You'll find them somewhere in the jdk's doc or guide

Double click on a JTable row.

I got and run a sample about double click on a JTable and it works fine. This sample defines a TableModel as shown at the end this note.
On the other hand, I have an application in which I have defined a JTable
using the DefaultTableModel as follows :
DefaultTableModel dtm = new DefaultTableModel(data, names);
JTable table = new JTable(dtm); where data and names are String arrays.
Of course the mouse listener stuffs have been also specified.
table.addMouseListener(new MouseAdapter(){
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I changed it with the DefaultTableModel class. At this point, the Double click does not work anymore.
So I gues it should be an option which prevents double click to work.
I thought of using mousePress() instead of mouseClick(), but it's very dangerous (I tried). . If by error the user clicks twice (instead of only once) the mousePress method is invoked twice for the same entry
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Thanks a lot
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TableModel dataModel = new AbstractTableModel() {
     public int getColumnCount() { return names.length; }
     public int getRowCount() { return data.length;}
     public Object getValueAt(int row, int col) {return data[row][col];}
     public String getColumnName(int column) {return names[column];}
     public Class getColumnClass(int col) {return getValueAt(0,col).getClass();}
     public void setValueAt(Object aValue, int row, int column) {
       data[row][column] = aValue;
     };

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class ClickIt extends MouseAdapter
    public void mousePressed(MouseEvent e)
        JTable table = (JTable)e.getSource();
        Point p = e.getPoint();
        if(e.getClickCount() == 2)
            System.out.println("table.isEditing = " + table.isEditing());
        int row = table.rowAtPoint(p);
        int col = table.columnAtPoint(p);
        String value = (String)table.getValueAt(row,col);
        System.out.println(value);
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        final String[] names = { "column 1", "column 2", "column 3", "column 4" };
        final Object[][] data = getData("left");
        TableModel dataModel = new AbstractTableModel() {
            public int getColumnCount() { return names.length; }
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            public Object getValueAt(int row, int col) {return data[row][col];}
            public String getColumnName(int column) {return names[column];}
            public Class getColumnClass(int col) {return getValueAt(0,col).getClass();}
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        return configure(table);
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        String[] colNames = { "column 1", "column 2", "column 3", "column 4" };
        JTable table = new JTable(new DefaultTableModel(getData("right"), colNames));
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    private Object[][] getData(String s)
        int rows = 4, cols = 4;
        Object[][] data = new Object[rows][cols];
        for(int row = 0; row < rows; row++)
            for(int col = 0; col < cols; col++)
                data[row][col] = s + " " + (row*cols + col + 1);
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        table.setCellSelectionEnabled(true);
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
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        table.addMouseListener(this);
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        JPanel panel = new JPanel(new GridLayout(1,0,0,5));
        panel.add(new JScrollPane(getLeftTable()));
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        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new ClickIt().getContent());
        f.pack();
        f.setVisible(true);
}

Making a jtable row noneditable based on a value in a certain cell.

I have a jTable (based on a database table) and one of the columns is OWNER. Is there a way to make an entire row noneditable based on the value in the OWNER column of the currently selected row?
Here is the listener code that I have on the jTable. I want to be able to make the entire row noneditable if the value (of the currently selected row) of the OWNER column is "SYSTEM". If it is anything other than "SYSTEM" then the user would be able to change the values on the row.
I can't override the isCellEditable method, because I only want the rows with the value of "SYSTEM" in the OWNER column to be noneditable.
jTable2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = jTable2.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
//no rows are selected
} else {
int selectedRow = lsm.getMinSelectionIndex();
if (jTable2.getValueAt(selectedRow, 1).equals("SYSTEM"))
System.out.println("Selected Row: " + selectedRow);
System.out.println("Owner Value: " + jTable2.getValueAt(selectedRow, 1));
//Make all cells in this row non-updateable???
//Need code to make the currently selected row noneditable
disableRetailerAddToList();
} else
enableRetailerAddToList();
Any direction for this problem would be greatly appreciated.

I've resolved it with some help by using the following:
NOT ([<plCall_Back_Required_ITAG>]=LookupValue("OCC_CUST_LOV_SR_3", "Yes") AND [<stCall_Back_Number_ITAG>] IS NULL)

How to bind JTable row height to the maximum height of a the columns

Suppose i have a JTable. data setup is done. Thing is whenever data font size increases table row height should change. How?

Add a PropertyChangeListener to the table to listen for a font change event. Then use the setRowHeight() method of the table.

JTable row background change - based on EXTERNAL event

Greetings folks!
I'm hoping for some help with a JTable issue. Here's the scenario:
The app is a point of sale application. The user scans or manually adds an item to the order, which causes a row to appear in the JTable displaying description, price, quantity, etc. The user can then right click a row on the JTable and select an option from the popup menu. If the user selects one of the options, I want to be able to change the background color on that row.
EVERYTHING I've seen online and researching is based on adding a custom renderer to the jtable which changes the background based on the data in the row. In my case there isn't anything in the row which changes... hence the point of changing the color.
What I'm looking for is a method which will let me change the background of row x. I'm guessing there isn't a way. I'm hoping someone has a suggestion.
Thanks in advance,
John E.
PS: I'm fairly new to java and working with inherited code, so please no 'you need to redesign the world' type answers unless there's an easier way. :)

In my case there isn't anything in the row which changesThen how is the table going to know what color to paint the row? Remember painting the row is a dynamic process. You can't just paint it once. You need the ability to repaint the row if for example the table is scrolled and the row is now longer present. Then when the table scrolls again and the row is present you need to be able to repaint the row in your specified color. This means you need some way to tell the table what color the row should be. Which means you need to keep that information somewhere.
One way to do this is to store the data in the TableModel that indicates that this row should be painted a "different" color. Then your situation is like the examples you have found. You now have some data you can test. This column does not need to be visible in the table since you can remove the TableColumn from the TableColumnModel so the column is not painted.
Here is a simple posting that shows a better approach to painting row backgrounds withouth using a renderer:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=610474

Customize jtable rows

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