Can Jtable column preferences be preserved?

Hi,
I re-ordered my JTable columns and removed/added a few. However, this gets overwritten as soon as I perform another search. Can column preferences be preserved for for a particular user?
Thanks,
Samba.

Yes.
You can register a TableColumnModelListener with your tables TableColumnModel and save the changes to a file in the users home directory.
When restoring you can change the tables TableColumnModel using the stored values (before registering the Listener).
bye
TPD

Similar Messages

How Can I set up a JTable columns?

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.
How can this be done?
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"};
        JTable perstab = new JTable(data, columnNames);
        perstab.setGridColor(Color.yellow);
        perstab.setPreferredScrollableViewportSize(new Dimension(500,500));
        JScrollPane scrollPane = new JScrollPane(perstab);
        pane1.add(new JPanel(), BorderLayout.EAST);
        JButton btn = new JButton("What are the names?");
        btn.addActionListener(this);
        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]);

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"};
        JTable perstab = new JTable(data, columnNames);
     ((DefaultTableModel)perstab.getModel()).setColumnCount(Integer.parseInt(name.getText()));
        perstab.setGridColor(Color.yellow);
        perstab.setPreferredScrollableViewportSize(new Dimension(500,500));
        JScrollPane scrollPane = new JScrollPane(perstab);
        pane1.add(new JPanel(), BorderLayout.EAST);
        JButton btn = new JButton("What are the names?");
        btn.addActionListener(this);
        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]);

F2 key not working with custom JTable Column

I have a custom JTable Column (which is a JPanel with a JTextfield and JButton). Everything works as expected, except when the user presses "F2" to start editing the custom column cell. When the user presses F2, the custom cell goes into editing mode, but I am unable to type anything in it.
Below is the SSCCE.
Steps to Reproduce problem:
1) Run the Program
2) Select any cell in first Column.
3) Press "F2" and try to type into the cell. Can't type anything.
package com.ns;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.EventObject;
import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
public class TextButtonCellFrame extends javax.swing.JFrame {
    // Variables declaration - do not modify
    private JTextField inputText;
    private JScrollPane jScrollPane1;
    private JPanel testPanel;
    private JTable testTable;
    // End of variables declaration
    public TextButtonCellFrame() {
        initComponents();
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        testPanel = new JPanel();
        jScrollPane1 = new JScrollPane();
        testTable = new JTable();
        inputText = new JTextField();
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        testTable.setModel(new DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
        testTable.setCellSelectionEnabled(true);
        testTable.setRowHeight(52);
        testTable.setSurrendersFocusOnKeystroke(true);
        testTable.getColumnModel().getColumn(0).setCellRenderer(new MyTableCellRenderer());
        testTable.getColumnModel().getColumn(0).setCellEditor(new MyTableCellEditor(new JTextField()));
        testTable.getColumnModel().getColumn(0).setPreferredWidth(200);
        jScrollPane1.setViewportView(testTable);
        testPanel.add(jScrollPane1);
        inputText.setPreferredSize(new Dimension(50, 20));
        testPanel.add(inputText);
        getContentPane().add(testPanel, BorderLayout.CENTER);
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-576)/2, (screenSize.height-417)/2, 576, 417);
    }// </editor-fold>
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TextButtonCellFrame().setVisible(true);
    public class MyTableCellRenderer extends JPanel implements TableCellRenderer {
        Point point;
        JButton button1 = new JButton("Test 1");
        JTextField txtField = new JTextField();
        public MyTableCellRenderer() {
            setLayout(new BorderLayout());
            this.add(button1, BorderLayout.EAST);
            this.add(txtField,BorderLayout.CENTER);
        public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int rowIndex, int vColIndex) {
            if (isSelected) {
                txtField.setBackground(testTable.getSelectionBackground());
                txtField.setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
            else {
                txtField.setBackground(testTable.getBackground());
                txtField.setBorder(null);
            return this;
    public class MyTableCellEditor extends DefaultCellEditor {
        JPanel panel = new JPanel();
        JButton button1 = new JButton ("Test 1");
        JTextField txtField;
        MyTableCellEditor(JTextField txtField) {
            super (txtField);
            this.txtField = txtField;
            panel.setLayout(new BorderLayout());
            panel.add(button1, BorderLayout.EAST);
            panel.add(txtField,BorderLayout.CENTER);
        public void actionPerformed(ActionEvent e) {
            if (e.getSource() == button1)
                JOptionPane.showMessageDialog(null, "Action One Successful");
        public Component getTableCellEditorComponent(JTable table, Object value,
                                    boolean isSelected, int row, int column) {
            return panel;
       public boolean isCellEditable(final EventObject anEvent) {
          if (anEvent instanceof KeyEvent) {
             final KeyEvent keyEvent = (KeyEvent) anEvent;
             SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                   if (!Character.isIdentifierIgnorable(keyEvent.getKeyChar())) {
                      txtField.setText(txtField.getText() + keyEvent.getKeyChar());
                   txtField.setCaretPosition(txtField.getText().length());
                   txtField.requestFocusInWindow();
            return super.isCellEditable(anEvent);
}The code for isCellEditable(final EventObject anEvent) which is needed to edit the cell using keyboard was provided by DarrylBurke here
regards,
nirvan.

The F2 key when pressed generates an action event (either JTable generates it or some other component). I am not sure how to handle the action event in the isCellEditable() method. Also, F(X) range of keys other than F2 dump some junk character in the JTextfield when pressed. I am now stuck at this point and don't know how handle F(X) range of keys.
regards,
nirvan.

Export JTable Column headers to Excel document

Hello all!!! I am having a small problem while trying to export some data from a jTable to an excel document.
I have a jTable and I use a custom TableModel with this:
private String[] columnNames = {"First", "Second", "Third", "Forth"};as names for each column of the table.
The thing I am trying to do is to export exactly the same "headers" from the columns of the jTable to the excel spreadsheet using Jakarta POI. Unfortunately I don't know how to do it and I haven't found anything yet on this forum. Can anyone help me with this?
In simple words I want to know how I can have the same headers from my jTable columns, with the headers from the excel doument I will create.
Many thanks in advanve!!!
Kostas

Thank you for your reply first of all. The problem is how to get the heading text and how to put it to the excel's first row OR to excels "headings" (if it is possible...). [in other words replace A,B,C,D from the excel document with the headers I get from the jTable...] .
I hope now you can see what I am looking for... If there is no solution to this please tell me what are the alternatives. (B) could be a good example.
Thanks you very much!!
Kostas

Custom JTable column (JCheckBox) not included in row selection.

I am trying to use JCheckBox (for display only data) as one of my JTable columns. I have written custom cell renderer for the same. Every thing is working fine except that when I select a row, the new custom JCheckBox column is not included in selection. Here is the code that I am using.
    protected class CheckBoxColumnRenderer extends DefaultTableCellRenderer {
        JCheckBox ckb = new JCheckBox();
        public Component getTableCellRendererComponent(JTable table, Object value,
                    boolean isSelected, boolean hasFocus, int row, int column) {
            if (value instanceof Boolean) { // Boolean
              ckb.setSelected(((Boolean) value));
              ckb.setHorizontalAlignment(JLabel.CENTER);
              ckb.setBackground(super.getBackground());
              if (isSelected || hasFocus) {
                  ckb.setBackground(table.getSelectionBackground());
            return ckb;
    }How can I include the custom cell in the row selection.
regards,
nirvan.

they have lots of dependencies and it is not always easy to strip out an SSCCE without a considerable effort.Exactly. And is the cause of the problem the dependencies or something else. The only way to know for sure is to strip out the code and simplify the problem, that way you truly understand what the problem is.
The majority of time this can be done with minimal effort as in this case.
Some times we are sure that the problem is with certain part of the code Is the problem the code or the way the code is invoked? How do we know the TableModel is created properly or that the column class is overwritten correctly when we can't see it?
someone having a third look at it may actually find the enhancement required with ease.Exactly, but we need to see the big picture.
So are you sure that I should post an SSCCE with every possible question where coding is involved ?In the majority of cases a SSCCE is easily created in 5-10 minutes, so if you want the fastest help then yes.
Just twice this past week I was ready to ask a question on the forum and was preparing a SSCCE to post and sure enough both times the creation of the SSCCE caused me to look at the problem differently and I solved it. I would much rather solve a problem on my own then post a question and wait for hours (days) hoping someone else knows the answer.

What method should be used for resizing the particular JTable Column width

I have a four table. Only one table which are on top have a table header. I want that when user resize the topmost table with a mouse other table colume also be resized automatically. So I want to know that what method should be used for resizing the particular JTable Column width.
Thanks
Lalit

maybe you can implement a interface ComponentListener as well as ComponentAdapter with your topmost Table.
for example:
toptable.addComponentListener(
new ComponentAdapter(){
public void componentResized(ComponentEvent e){
table1.setSize(....);
table2.setSize(....);
/*Optionally, you must also call function revalidate
anywhere;*/
);

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++)
         tcm.getColumn(col).setHeaderValue(statisticsColumnNames[col]);
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.

Set JTable in another JTable Column

Hai Java Experts
Can we Set JTable in another JTable Column
In jsp we add one table in a column of another table. Like the previous way can we do it in swing?
Pls Help me with example..
Thanks

[http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#editrender]
db
edit And adding a table in a column of another table doesn't make any sense at all. Perhaps you meant showing a table in a cell of another table.
Edited by: DarrylBurke

Set background color to selected jtable columns cell

I am clicking on jtables column.I want to select any column and that column (only selected cell of column)should get displayed with specific background color.
plz help

You can write your own tablemodel,
i.e. use DefaultTableModel or implement AbstractTableModel.
Good luck!

Single JTable Column with several diff Cell Editors

Am trying to create a single JTable column that can have several different cell editors. Java seems to be bias to having 1 cell editor for the whole column.
For example in 1 column can I have
Row1 : TextBox
Row2: Check Box
Row3: Radio Buttons
Row4: JColorChooser
At the moment I can only have one CellEditor for the whole column which is not very helpful.

the default implementation offers to provide editors per column in the tableColumn and/or editors per class type by setting default editors ( JTable.setDefaultEditor(Class class, TableCellEditor editor) ). If you look at the getCellEditor method of JTable you see that first the tablecolumns are asked for an editor, and if this doesnt succeed a default editor for the class acording to the value at the passed grid position is determined.
If this does not fullfil your needs, you can still overwrite the getCellEditor method of JTable and return whatever editor is suitable.
regards,
stefan

User cannot resize jTables� columns

Hello,
Using NetBeans IDE 3.5.1, I built a jTable, controlled by a
JScrollpane.
My problem is that the user cannot resize the jTables� columns.
Maximum details:
1.     jtablewidth is set to a fixed value according to internal data:
JTable1.setPreferredSize( new Dimension(tableWidth, i_TableHeight));
2.     columnwidth is set according to internal data:
Col = JTable1.getColumnModel().getColumn(i);
Col.setWidth(width);
Col.setResizable(true);
Col.setMinWidth(width);
3.     jTable header details:
JTableHeader anHeader = JTable1.getTableHeader();
anHeader.setReorderingAllowed(false);
anHeader.setResizingAllowed(true);
4.     JTable1.getTableHeader().setResizingAllowed(true);.
5.     Initial declerations:
a.     JTable1.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_OFF);
     JTable1.setColumnSelectionAllowed(true);
     JTable1.setDragEnabled(true);
     JTable1.setPreferredScrollableViewportSize(new
java.awt.Dimension(650, 500));
     JTable1.setPreferredSize(new java.awt.Dimension(1200, 409));
     JTable1.setRequestFocusEnabled(false);
b.     JScrollPane1.setMaximumSize(new java.awt.Dimension(750, 412));
     JScrollPane1.setPreferredSize(new java.awt.Dimension(750,
412));
     JScrollPane1.setViewportView(JTable1);
     JScrollPane1.setAutoScolls(false);
c.     Jtable.autoCreateColumnsFromModel (true);
Thanks alot,
Itay

Columns resizing works by default. You don't need to do anything special.
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
And don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the code retains its original formatting.

Resize JTable Columns without Column Header

Hi all.
I have a JTable that doesn't display a column header.
I would like to allow the user to resize the columns by dragging a mouse at the column edges at any point down the table.
It is not obvious how I can accomplish this.
Does anyone have any ideas?
Thanks, Paul.

That doesn't work, though, since the table has its own listenersIt's not just that. The header's mouse listeners work with instance fields of BasicTableHeaderUI and detection (using e.getPoint) of the header cell and column.
I would start with copying the entire code of BasicTableHeaderUI to a class of my own, then first eliminate anything that obviously isn't related to column dragging/resizing, then refactor, refactor, refactor to make the listener codes work with a table instead of a header. But like I said, easier said than done, particularly when having to deal with the various JTable column resize modes.
db

How to resizea JTable column to fit to text programatically?

hi evreyone,
i'm trying to resize a JTable column width to fit to the contained text programatically.my approach was that i made a comparison between the length of String objects contained in my column and got the biggest String length value but i want to know how can i resize the column to fit to this biggest String object

You're going the wrong way about it - don't go calculating string lengths. Get the TableCellRenderer, query it for the renderer component for each cell in the column, obtain its preferred size and keep a record of the greatest width value.

Jtable column resize

Hi all!
i'm using:
jTable1.getColumnModel().getColumn(1).setPreferredWidth(7);
to resize jtable column width but it's not working, do you know what can be happening?
thanks!

All you've done is say what size you would prefer.
You then have to force the component to repaint, with something like
            jTable1.invalidate();
            jTable1.doLayout();
            jTable1.repaint();Ps. I posted a nice utility class to automaticaly fit the JTable columns to the exact size required here.
http://forum.java.sun.com/thread.jspa?forumID=54&messageID=2532529&threadID=527301
regards,
Owen

JTable Column Max Number Doubt

Hello there,
I have this JTable Doubt. I have always been strugling with jtables and here I am stuck again and not able to do this.
My Database has defined a column that accepts a String Number. It can have upto 4 decimals and 2 fractional Numbers. So thats a total of 6 digits with a contraint as mentioned above.
I can have user input as 9999.99 and not 99999.9
Could you please tell me how I could have one of my JTables column to accept only input like this.
Regards,
Hemanth

It is not clear to me whether you are talking about rendering or editing.

Can Jtable column preferences be preserved?

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