Dynamically set font in a JTable cell

Hi there,
i have a JTable, and a JTCombo box containing all the system fonts available. The JTable is made up of my own class called myCell which can be seen below. I have also implemented my own custom renderer. What i would like to do is when the user selects a new system font, the text that is then typed into the JTable to be of that font. If the system font is changed again, i would like any new text to be of the new font, and the old fonts remain the same (i hope that makes sense!) Anyway, im quite stuck about this - i have tried messing around with the cellrenderer but all the text in all the cells changes to the new font. Does anyone know how to do this? many thanks, Rupz
     public myCell(int aRow,int aCol,Object someValue, TreeSet somecells, String aFormula){
          row = aRow;
          col = aCol;
          value = someValue;
          expression = aFormula;
          references = somecells;
     }

First of all the Java standard for class names us to use upper case characters for the first letter of each word. So your class should be MyCell.
Now your MyCell class need to keep the Font as one of its properties. Maybe you would override the JTable getCellEditor(...) method such that if the Font property for the cell is null, then set the cell Font to the current default Font. The renderer would then use the Font from the cell when it is non-null.

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Setting two JTextFields inside JTable cell

hi,
I am really stick trying to figure out how to set two cells inside a JTable cell. This needs to be done because if there is a value already inside the cell then i want to drop another value - this new value should be displayed inside another cell but along with the other value already in the cell.
I assume that i would need to create two JTextFields.
But can anyone help me further please.

That should be a simple issue of customizing table cell editor and renderer.
See tutorials.

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I have a JTable which contains two columns adjacent to each other, both containing numbers (Floats).
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karen,
I suggest you just make the whole cell the "select" colour, especially if it's a background colour... it gives the user a better impression of what it will look like in the "whatever".... even if you think it doesn't look so good "in itself".
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Does SSRS dynamically set the alignment of table cells based on the majority of cell types in the column???

This is the first time I've run into this, but it appears that SSRS is setting the text-align based on the other cells in the column. I have cells being set with either a dataset item of type System.Double or to "--" when Is Nothing evaluates
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Are you viewing the report in html format or are you looking in some other format like Excel,CSV etc?
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Is there some way to set focus on a JTable Cell?

Hi,
I have used JDK6 with a JTable that has some cells not-editabled and others editable.
Then, when the user types TAB key, I would like to change to next editabled cell, jumping out the not-editables. Is there a way to do this?
Thanks

check out this thread:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=509913
Theoretically you could modify the FocusTraversalPolicy but I've never done that.
Message was edited by:
Jaspre

Dynamically Rendering and editing JTable cell

Hi all,
I wonder if some body can help me.
As in my application each cell in Jtable returns java Object. and what i am trying to do is based on each object returned in cell my renderer is going to change dynamically. for example if the object returned is primitive data types the renderer is defualt, if the returned object is Map, Set or List, then the Cell Renderer should show clickable button with icon on right hand side and TextField on left hand side and so on for other objects. i am able get renderer for Map, set or list, which is button on right hand side of cell and text field on left hand side displaying toString of Object. then what i want is when i click button it should show those values in popup window and if i double click it should edit the cell which i am able to do it. so how can i handle events or what i have to do to make button clickable. if any body come accross these situations or got idea. please let me know how to move further.
Thanks,
Kotesh.

Hi,
Thanks for your advise and as i said i am able to get render for Map as (TextField in left hand side+Button with icon in right hand side side) of Cell. but what i need is when i click button which is on right hand, then i should be able to show popup wvindow with map values and if i double click on TextField which is on right hand side, then i should be able to edit Cell which is happening. but i am not able to get popup window when i click button on right hand side of cell. basically i am not sure how to handle events on cell and the button on right hand side?
if some one can guide me that will be great as i am in big trouble.
Thanks
Kotesh.

How do you set defaults in pages such as font and moving between cells in a table?

How do you set defaults in Pages such as font and moving between cells in a table?

Default layout and styles can be set by setting up a sheet with your settings and saving as a user template (File > Save As Template). I don't know of a way to set defaults for moving between cells in a table.

Setting JTable cell editor

Hallo,
I have troubles setting jtable cell edtior. when i run code below, editor stays unchnaged.
Do you know where's the problem, please (except in programmer^_^) ???
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class Test extends JFrame {
    JTable table;
    Test() {
        // Create table model
        table = new JTable();
        table.setModel(new DefaultTableModel(
            new Object[][] {
                { Boolean.TRUE, Integer.valueOf(10) },
                { "Hallo!", Boolean.FALSE },
            }, new String[] { "Col1", "Col2" }));
        // Setup frame a little
        setLayout(new BorderLayout());
        setBounds(new Rectangle(300,300,200,100));
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        add(table,BorderLayout.CENTER);
         * Two calls below have no effect:-(
         * What did i wrong?
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        table.setCellEditor(new DefaultCellEditor(
                new JComboBox(new String[] { "0", "1" }) ));
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        table.setDefaultEditor(Boolean.class, new DefaultCellEditor(
                new JCheckBox() ));
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        table.setDefaultEditor(String.class, new DefaultCellEditor(
                new JComboBox( new String[] { "Hallo!", "Bye!" } ) ));
    public static void main(String[] arg) {
        Test test = new Test();
        test.setVisible(true);
}

Hi again,
yes it works when i set it for single column, but i'd like to use default editor, because column count is not fixed.
According to documentation: "Sets a default cell editor to be used if no editor has been set in a TableColumn. If no editing is required in a table, or a particular column in a table, uses the isCellEditable method in the TableModel interface to ensure that this JTable will not start an editor in these columns. If editor is null, removes the default editor for this column class."
So when i call
column.setCellEditor(null); in TableColumnModelListener columnAdded event. But still it's not working. See sample below (i've changed it to cell renderer coz result is clear on single view, but problem stays same)
More over problem seems to be with algoritm that decide which class to use. Object takes preference any time. W/o it npe arries.
Regards
Adam
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Test extends JFrame {
    JTable table;
    Test() {
        // Create table model
        table = new JTable();
        table.setModel(new DefaultTableModel(
            new Object[][] {
                { Boolean.TRUE, Integer.valueOf(10) },
                { "Hallo!", Boolean.FALSE },
            }, new String[] { "Col1", "Col2" }));
        // Setup frame a little
        setLayout(new BorderLayout());
        setBounds(new Rectangle(300,300,200,100));
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        add(table,BorderLayout.CENTER);
        table.setDefaultRenderer(Object.class,new Renderer(Color.YELLOW));
        table.setDefaultRenderer(String.class,new Renderer(Color.BLUE));
        table.setDefaultRenderer(Boolean.class,new Renderer(Color.RED));
        table.setDefaultRenderer(Integer.class,new Renderer(Color.GREEN));
        // use default renderer in all columns
        table.getColumn(table.getColumnName(0)).setCellRenderer(null);
        table.getColumn(table.getColumnName(0)).setCellRenderer(null);
    public static void main(String[] arg) {
        Test test = new Test();
        test.setVisible(true);
    class Renderer extends DefaultTableCellRenderer {
        Color color;
        Renderer(Color color) { this.color = color; }
        public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {
            super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            setBackground(color);
            setToolTipText("Class is "+value.getClass().getName());
            return this;
}Message was edited by:
a3cchan

Problem when setting JTable cell color.

hello,
when I setting color for particular table cell, it sets.
but, when I click another row (another cell) , the color of the previous cell disabled and it visible only when I click that cells row.
how can I permanatly set the color for the rows depends on input data.
for example,
if a device is connected, I want to give the cell color GREEN.
if device is not connected , i want to give the color as RED.
thank you.

but, when I click another row (another cell) , the color of the previous cell disabled and it visible only when I click that cells row.It appears you applied color to cell editor.
tableObj.getComponentAt(x,y).setForeground(Color.red);
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Dynamic colored in theh JTable cell

Hi, All
I am using a JTable to display a Jlable in the JTable cells.
The lable is divided to, say 10 , sub rectangles. I would liketo fill each rectangles with different bg colors depending on the data I received. I tried to use html in the JLable to control the color, however, it is very expensive cuase it involves a lot of string process and also it is difficult to control the dimension of those rectangles. Do anyone has any better idea to do this ?
The cell is not necessary to be a JLable, by the way.
Thanks in advance !

I have never used JPanel as my table cell component, but u might want to implement performance improvements similiar to ones done in DefaultTableCellRenderer which extends JLabel.
Here is the code extract from DefaultTableCellRenderer
* The following methods are overridden as a performance measure to
* to prune code-paths are often called in the case of renders
* but which we know are unnecessary. Great care should be taken
* when writing your own renderer to weigh the benefits and
* drawbacks of overriding methods like these.
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
public void validate() {}
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
public void revalidate() {}
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
public void repaint(long tm, int x, int y, int width, int height) {}
* Overridden for performance reasons.
* See the Implementation Note
* for more information.
public void repaint(Rectangle r) { }

Custom JTable cell editor problem

I have a custom JTable cell editor which is a JPanel with 2 JtextFields, One for a name, the other for a data value. My problem lies in when the the cell is selected and then the user start typing. The JTextfield outline shows up, but there is no carat. I can only edit the cell when I click the mouse in it again. I have my isCellEditable method set to only allow editing on 2 mouse clicks, but I did try it with just returning true and had the same problem. Please help.
Code:
class cellValue {
String name;
String data;
Color nameColor;
Color dataColor;
Font font;
public cellValue(String n, String d, Color nC, Color dC, Font ff){
name = n;
data = d;
nameColor = nC;
dataColor = dC;
font = ff;
} //end class
public class TextFieldCellEditor extends JPanel implements TableCellRenderer, TableCellEditor{
private EventListenerList listenerList = new EventListenerList();
private ChangeEvent event = new ChangeEvent(this);
private cellValue s;
private int e_row=0;
private int e_col=0;
private JTextField ta;
private JTextField tb;
public TextFieldCellEditor() {
setLayout(new GridBagLayout());
ta = new JTextField();
tb = new JTextField();
tb.setHorizontalAlignment(SwingConstants.RIGHT);
add(ta, new GridBagConstraints(0,0,1,1,0.6,0.0,java.awt.GridBagConstraints.WEST,java.awt.GridBagConstraints.BOTH,new Insets(0,1,0,0),0,0));
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} //end init
public Component getTableCellRendererComponent(JTable table, Object value,boolean isSelected,
boolean hasFocus,int row, int column) {
s = (cellValue)value;
e_row = row;
e_col = column;
ta.setText(s.name);
tb.setText(s.data);
ta.setFont(s.font);
tb.setFont(s.font);
ta.setForeground(s.nameColor);
tb.setForeground(s.dataColor);
setForeground(table.getForeground());
setBackground(table.getBackground());
ta.setBackground(table.getBackground());
tb.setBackground(table.getBackground());
ta.setCaretColor(Color.WHITE);
tb.setCaretColor(Color.WHITE);
return (JComponent)(this);
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
return (getTableCellRendererComponent(table, value,isSelected, true, row, column));
public boolean isCellEditable(EventObject e) {
if (e instanceof MouseEvent) {
return ((MouseEvent)e).getClickCount() >= 2;
} return true;
// return true;
public boolean shouldSelectCell(EventObject anEvent) {
return (true);
public void cancelCellEditing() {
public boolean stopCellEditing() {
fireEditingStopped();
return (true);
public Object getCellEditorValue() {
return (ta.getText());
public void addCellEditorListener(CellEditorListener l){
try {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {requestFocus();}
} catch (Exception e) {};
listenerList.add(CellEditorListener.class, l);
public void removeCellEditorListener(CellEditorListener l) {
listenerList.remove(CellEditorListener.class, l);
protected void fireEditingStopped(){
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2)
((CellEditorListener)listeners[i+1]).editingStopped(event);
protected void fireEditingCanceled() {
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2)
((CellEditorListener)listeners[i+1]).editingCanceled(event);
} //end class

Thanks again for the repley.
I tried removing the celleditorlistener and using the setSurrenderFocusOnKeystroke, but it did not work. The textfield is editable;
I did change:
public void addCellEditorListener(CellEditorListener l){
try {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {ta.requestFocus();}
} catch (Exception e) {};
listenerList.add(CellEditorListener.class, l);
}This allows the first textfield to request focus and this seems to work. But when I highlight a cell, then start typing, the first character I type puts me into the editor, but it is lost. Example:
I type hello
and get ello in the cell. Then when I press enter the input is excepted and the selection goes to the next cell, but I cannot move the Highlight cursor at all, seems locked. The only way I can continue to the next cell is to use the mouse.
You said you had a cell editor working. Would you care to share as an example. This is killing me to get this to work properly.
Thanks again
Dave

Dynamically setting column width doesn't work all the time

I wanted to dynamically set the width of a column in a JTable to be half of the width of a another column. This should happen whenever the frame is resized. But somehow I need to tell this twice to Java. If I don't then sometimes the column width isn't set new.
Is this a Java bug or what?
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Is it possible that your call to
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Please Mark posts as answers or helpful so that others may find the fortune they seek.

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Probably it's a stupid question but I have this problem:
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