Hiding a value available in JTable Cell

I have a JTable with 10 columns and mutilple rows depends on the data available. Some time I will get redundant values displayed in the table. Since I am using the Jtable Header sorting, I need all the values in all the columns. But those duplicate values should not be displayed in the cell rather it should go hidden. Any suggestions will be greatly appreciatable.
Thanks

Thanks Mr. Greg!
I have the value to be available for further sorting and other reference. It just needs to be hide, say like I tried to have the foregroundcolor to be white. So that it will not be visible but while sorting I can use the value.
Though I tried to change the foreground color, its changing the whole column, I couldnt able to control it with particular (column, row) :-(
Thanks

Similar Messages

How to force check right value of a JTable cell?

Hi,
I have a JTable with a column that must have a value no empty and between 0 and 100. I made a sample with only one column for simplicity.
The code works fine when the user types some value. However, when the user press ENTER to go to next column, without editing the cell, no checks run.
I have also other column that the user may type a part of a name and the system must find the full name of a person. In this column, if user uses ENTER without editing the cell, the same problem ocurrs.
The simplistic code is here, runnable:
import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.text.NumberFormat;
import java.text.ParseException;
import javax.swing.text.DefaultFormatterFactory;
import javax.swing.text.NumberFormatter;
public class TableCheckCell extends JFrame {
/** Creates a new instance of TableCheckCell */
public TableCheckCell() {
    Object[] columnNames = {"Percents"};
    Object[][] data =
      {new Integer(-1)}, // <--- DEFAULT VALUE FORCED TO BE OUT OF RANGE...
      {new Integer(-1)},
      {new Integer(-1)},
      {new Integer(-1)}
    DefaultTableModel model = new DefaultTableModel(data, columnNames);
    JTable table = new JTable(model);
    table.setPreferredScrollableViewportSize(table.getPreferredSize());
    JScrollPane scrollPane = new JScrollPane( table );
    getContentPane().add( scrollPane );
    TableColumn col = table.getColumnModel().getColumn(0);
    col.setCellEditor(new CellIntegerEditor(CellIntegerEditor.CHECKMINMAX,0,100));
public static void main(String[] args) {
    TableCheckCell frame = new TableCheckCell();
    frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
    frame.pack();
    frame.setLocationRelativeTo( null );
    frame.setVisible(true);
* Implements a cell editor that uses a formatted text field
* to edit Integer values.
class CellIntegerEditor extends DefaultCellEditor {
public static final int NOCHECK = 0;
public static final int CHECKMINMAX = 1;
public static final int CHECKMIN = 2;
public static final int CHECKMAX = 3;
JFormattedTextField ftf;
NumberFormat integerFormat;
private int checkinterv;
private Integer minimum, maximum;
private boolean DEBUG = false;
public CellIntegerEditor(int checkinterv, int min, int max) {
    super(new JFormattedTextField());
    init(checkinterv, min, max);
void init(int checkinterv, int min, int max) {
    ftf = (JFormattedTextField)getComponent();
    this.checkinterv = checkinterv;
    minimum = new Integer(min);
    maximum = new Integer(max);
    //Set up the editor for the integer cells.
    integerFormat = NumberFormat.getIntegerInstance();
    NumberFormatter intFormatter = new NumberFormatter(integerFormat);
    intFormatter.setFormat(integerFormat);
    if (checkinterv == CHECKMIN || checkinterv == CHECKMINMAX)
      intFormatter.setMinimum(minimum);
    if (checkinterv == CHECKMAX || checkinterv == CHECKMINMAX)
      intFormatter.setMaximum(maximum);
    ftf.setFormatterFactory(new DefaultFormatterFactory(intFormatter));
    ftf.setValue(minimum);
    ftf.setHorizontalAlignment(JTextField.TRAILING);
    ftf.setFocusLostBehavior(JFormattedTextField.PERSIST);
    //React when the user presses Enter while the editor is
    //active. (Tab is handled as specified by
    //JFormattedTextField's focusLostBehavior property.)
    ftf.getInputMap().put(KeyStroke.getKeyStroke(
      KeyEvent.VK_ENTER, 0),
      "check");
    ftf.getActionMap().put("check", new AbstractAction() {
      public void actionPerformed(ActionEvent e) {
        if (!ftf.isEditValid()) { //The text is invalid.
          if (userSaysRevert()) { //reverted
            ftf.postActionEvent(); //inform the editor
        } else try {              //The text is valid,
          ftf.commitEdit();     //so use it.
          ftf.postActionEvent(); //stop editing
        } catch (java.text.ParseException exc) { }
//Override to invoke setValue on the formatted text field.
public Component getTableCellEditorComponent(JTable table,
    Object value, boolean isSelected,
    int row, int column) {
    JFormattedTextField ftf =
      (JFormattedTextField)super.getTableCellEditorComponent(
      table, value, isSelected, row, column);
    ftf.setValue(value);
    return ftf;
//Override to ensure that the value remains an Integer.
public Object getCellEditorValue() {
    JFormattedTextField ftf = (JFormattedTextField)getComponent();
    Object o = ftf.getValue();
    if (o instanceof Integer) {
      return o;
    } else if (o instanceof Number) {
      return new Integer(((Number)o).intValue());
    } else {
      if (DEBUG) {
        System.out.println("getCellEditorValue: o isn't a Number");
      try {
        return integerFormat.parseObject(o.toString());
      } catch (ParseException exc) {
        System.err.println("getCellEditorValue: can't parse o: " + o);
        return null;
//Override to check whether the edit is valid,
//setting the value if it is and complaining if
//it isn't. If it's OK for the editor to go
//away, we need to invoke the superclass's version
//of this method so that everything gets cleaned up.
public boolean stopCellEditing() {
    JFormattedTextField ftf = (JFormattedTextField)getComponent();
    if (ftf.isEditValid()) {
      try {
        ftf.commitEdit();
      } catch (java.text.ParseException exc) { }
    } else { //text is invalid
      if (!userSaysRevert()) { //user wants to edit
        return false; //don't let the editor go away
    return super.stopCellEditing();
   * Lets the user know that the text they entered is
   * bad. Returns true if the user elects to revert to
   * the last good value. Otherwise, returns false,
   * indicating that the user wants to continue editing.
protected boolean userSaysRevert() {
    Toolkit.getDefaultToolkit().beep();
    ftf.selectAll();
    Object[] options = {"Corrigir"};
    String msg = "";
    if (checkinterv == CHECKMINMAX)
      msg = "Value must be between " + minimum + " and " + maximum + ".";
    else if (checkinterv == CHECKMIN)
      msg = "Value must be >= " + minimum + ".";
    else if (checkinterv == CHECKMAX)
      msg = "Value must be <= " + maximum + ".";
    JOptionPane.showMessageDialog(SwingUtilities.getWindowAncestor(ftf),msg);
    ftf.setValue(ftf.getValue());
    return true;
}Then, I'd like to know if there is any way to check the user typed ENTER to go out of the cell, check the value of the cell and, if it is wrong, to come back to the cell, forcing the user to type a right value.

Editing to force the entry of data in a cell is typically done when you press a button to process the data. It doesn't make sense to "edit" the cell when the user presses enter to go to the next cell. What if the user never places focus on a particular cell. Then the cell will never be edited.
To force a user to enter a valid value once they have started editing you can do something like this:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=575309
But you can't force a user to visit every cell in the table so you need to handle that as described above.

Updating value in a jtable cell

hi
I have a JTable where user enters numbers into the cells and then clicks on a button which reads all these numbers and prints a number which is calculated using all these values
my problem is that the very last cell which data is typed into is not "seen" and the only way for the system to see it is if i remove focus from that cell before i press the button.
is there anyway for me to be able to press that button and the system read the last cell without having to click of that last cell before hand?
the way i obtain the value in each cell is table.getValueAt(i , j)
does anyone understand what i mean? its kinda hard to explain.
thanks alot

PhHein wrote:
corlettk wrote:
PhHein wrote:
corlettk wrote:
Edited by: corlettk on 6/04/2009 22:33 ~~ Mr Hein has already posted a better way... A day late and a penny short ;-)I would have expected you to be less formal at that time of the day ;-)It's a weeknight.Ooh, I didn't think that mattered in Australia(?) . ;-)We need to give the breweries three days a week to restock... Traditionaly that's Monbluddyday, Tuesbluddyday, and Wedbluddynesday... It's all good Thursday through Sunday though, as long as your äss isn't on fire, or twenty feet below flood level, and you can resist the urge to tongue-pash a sting-ray, that is.
Cheers. Keith.

Shading part of a JTable Cell dependent upon the value of the cell

Hi
Was hoping some one woudl be able to provide some help with this. I'm trying to create a renderer that will "shade" part of a JTable cell's background depending upon the value in the cell as a percentage (E.g. if the cell contains 0.25 then a quarter of the cell background will be shaded)
What I've got so far is a renderer which will draw a rectangle whose width is the relevant percentage of the cell's width. (i.e. the width of the column) based on something similar I found in the forum but the part I'm struggling with is getting it to draw this rectangle in any cell other than the first cell. I've tried using .getCellRect(...) to get the x and y position of the cell to draw the rectangle but I still can't make it work.
The code for my renderer as it stands is:
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
public class PercentageRepresentationRenderer extends JLabel implements TableCellRenderer{
     double percentageValue;
     double rectWidth;
     double rectHeight;
     JTable table;
     int row;
     int column;
     int x;
     int y;
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
          if (value instanceof Number)
               this.table = table;
               this.row = row;
               this.column = column;
               Number numValue = (Number)value;
               percentageValue = numValue.doubleValue();
               rectHeight = table.getRowHeight(row);
               rectWidth = percentageValue * table.getColumnModel().getColumn(column).getWidth();
          return this;
     public void paintComponent(Graphics g) {
        x = table.getCellRect(row, column, false).x;
        y = table.getCellRect(row, column, false).y;
          setOpaque(false);
        Graphics2D g2d = (Graphics2D)g;
        g2d.fillRect(x,y, new Double(rectWidth).intValue(), new Double(rectHeight).intValue());
        super.paintComponent(g);
}and the following code produces a runnable example:
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class PercentageTestTable extends JFrame {
     public PercentageTestTable()
          Object[] columnNames = new Object[]{"A","B"};
          Object[][] tableData = new Object[][]{{0.25,0.5},{0.75,1.0}};
          DefaultTableModel testModel = new DefaultTableModel(tableData,columnNames);
          JTable test = new JTable(testModel);
          test.setDefaultRenderer(Object.class, new PercentageRepresentationRenderer());
          JScrollPane scroll = new JScrollPane();
          scroll.getViewport().add(test);
          add(scroll);
     public static void main(String[] args)
          PercentageTestTable testTable = new PercentageTestTable();
          testTable.pack();
          testTable.setVisible(true);
          testTable.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}If anyone could help or point me in the right direction, I'd appreciate it.
Ruanae

This is an example I published some while ago -
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
public class Fred120 extends JPanel
    static final Object[][] tableData =
        {1, new Double(10.0)},
        {2, new Double(20.0)},
        {3, new Double(50.0)},
        {4, new Double(10.0)},
        {5, new Double(95.0)},
        {6, new Double(60.0)},
    static final Object[] headers =
        "One",
        "Two",
    public Fred120() throws Exception
        super(new BorderLayout());
        final DefaultTableModel model = new DefaultTableModel(tableData, headers);
        final JTable table = new JTable(model);
        table.getColumnModel().getColumn(1).setCellRenderer( new LocalCellRenderer(120.0));
        add(table);
        add(table.getTableHeader(), BorderLayout.NORTH);
    public class LocalCellRenderer extends DefaultTableCellRenderer
        private double v = 0.0;
        private double maxV;
        private final JPanel renderer = new JPanel(new GridLayout(1,0))
            public void paintComponent(Graphics g)
                super.paintComponent(g);
                g.setColor(Color.CYAN);
                int w = (int)(getWidth() * v / maxV + 0.5);
                int h = getHeight();
                g.fillRect(0, 0, w, h);
                g.drawRect(0, 0, w, h);
        private LocalCellRenderer(double maxV)
            this.maxV = maxV;
            renderer.add(this);
            renderer.setOpaque(true);
            renderer.setBackground(Color.YELLOW);
            renderer.setBorder(null);
            setOpaque(false);
            setHorizontalAlignment(JLabel.CENTER);
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col)
            final JLabel label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
            if (value instanceof Double)
                v = ((Double)value).doubleValue();
            return renderer;
    public static void main(String[] args) throws Exception
        final JFrame frame = new JFrame("Fred120");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new Fred120());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
}

Edit a JTable cell, click save button, value isn't stored in JTable

I'm editing a JTable cell, just using default editor provided by JTable
I click a save button elsewhere in my GUI
The value typed into the cell so far isn't stored in the TableModel yet and so doesn't get saved.
How can I make sure the value gets stored in the JTable in the above scenario when the JButton is pressed but before saving.
Preferably I'd like the code with the JButton not to have to know about the JTable at all.
Cheers,
D

I the forums 100s of times.Many thanks. If they had a decent search on this forum I might have found it as I did try.
Come to think of it - Sun have completely fcukd up this forum.

JTable cell editor ..not able to delete value in the cell

Hello,
I have applied Cell Editor on the JTAble. I'm able to enter value initially in the cell.
Once I tab out of that cell, go back to the same cell, edit the value again and tab out. It still shows me old value, not the updated one.
I'm using putClientProperty("terminateEditOnFocusLost", Boolean.TRUE) to recognise the cell value without focus lost.
Does this cause any problem ???
Thanks in advance
Kapil

then what might be the problem of value not getting deleted ??
Code is:
public class MyTableCellEditor extends AbstractCellEditor
implements TableCellEditor {
//This is the component that will handle the editing of the cell value
private JTextField component = null;
//This method is called when a cell value is edited by the user.
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int rowIndex, int vColIndex) {
component = new JTextField();
System.out.println("value*************** "+value);
System.out.println("Component value*************** "+component.getText());
if(value != null){
component.setText(value.toString());
else{
component.setText("");
// Return the configured component
return component;
// This method is called when editing is completed.
// It must return the new value to be stored in the cell.
public Object getCellEditorValue() {
return component.getText();
public boolean shouldSelectCell(EventObject anEvent) {
return false;
}

Programatically change( edit?? ) JTable cell value

If my user changes the value in cell 'A', I'd like to change the value in cell 'B' to the results of a calculation performed using the new value in A with the present ( prior to changing ) value in B.
Example:
Cell: suggested_sell_price
Cell: cost_this_item
A change in the cost_this_item cell would be reflected in the suggested_sell_price,(upon hitting enter the values are stored in the DB)
Any suggestions would be greatly appreciated,

Thanks for the suggestions. I'm posting a test program of what I have at the moment, it has some of the behavior I'm looking for, but I can't seem to get the new value of an aedited cell and set the table model with the new value.
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class TE extends JFrame
     String[] cols = {"VAL_1", "VAL_2", "VAL_3"};
     Object[][] filler = {
                                   {new Double(100.00), new Double(100.00), new Double(100.00)},
                                   {new Double(200.00), new Double(200.00), new Double(200.00)},
                                   {new Double(400.00), new Double(400.00), new Double(400.00)}
     JTable table;
     TE(String title)
               super(title);
               this.setDefaultCloseOperation(EXIT_ON_CLOSE);
               MTM mtm = new MTM(3, cols.length);
               mtm.setColumnIdentifiers(cols);
               int nRows = filler.length;
               for(int i = 0; i < nRows; ++i)
                         mtm.setValueAt(filler[0], 0, i);
                         mtm.setValueAt(filler[1][i], 1, i);
                         mtm.setValueAt(filler[2][i], 2, i);
               table = new JTable(mtm);
               table.getColumnModel().getColumn(1).setCellEditor(new SimpleCellEditor());
               table.getColumnModel().getColumn(2).setCellEditor(new SimpleCellEditor());
               //table.getColumnModel().getColumn(2).setCellEditor(new SimpleCellEditor());
               JScrollPane jsp = new JScrollPane(table);
               Container c = getContentPane();
               c.add(jsp);
               setSize(300,300);
               setVisible(true);
     class MyMouseListener extends MouseAdapter
               public void mouseClicked(MouseEvent e)
                    if(e.getClickCount() == 2)
                              table.setValueAt("QQQQQQQ", 1,1);
class SimpleCellEditor extends AbstractCellEditor implements TableCellEditor, ActionListener
     JTextField tf = new JTextField();
     TableModel tm = table.getModel();
     protected EventListenerList listenerList = new EventListenerList();
     protected ChangeEvent changeEvent = new ChangeEvent(this);
     public SimpleCellEditor()
               super();
               tf.addMouseListener(new MyMouseListener());
               tf.addActionListener(this);
public void addCellEditorListener(CellEditorListener listener) {
listenerList.add(CellEditorListener.class, listener);
public void removeCellEditorListener(CellEditorListener listener) {
listenerList.remove(CellEditorListener.class, listener);
protected void fireEditingStopped()
          CellEditorListener listener;
          Object[] listeners = listenerList.getListenerList();
          for (int i = 0; i < listeners.length; i++)
               if (listeners[i] == CellEditorListener.class)
                         listener = (CellEditorListener) listeners[i + 1];
                         listener.editingStopped(changeEvent);
protected void fireEditingCanceled()
     CellEditorListener listener;
          Object[] listeners = listenerList.getListenerList();
               for (int i = 0; i < listeners.length; i++)
               if (listeners[i] == CellEditorListener.class)
                    listener = (CellEditorListener) listeners[i + 1];
                    listener.editingCanceled(changeEvent);
public void cancelCellEditing()
          fireEditingCanceled();
public boolean stopCellEditing()
          fireEditingStopped();
          return true;
public boolean isCellEditable(EventObject event)
          return true;
     public boolean shouldSelectCell(EventObject event)
     return true;
public Object getCellEditorValue()
     return tf.getText();
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
     if(tf.hasFocus() == true)
               tf.setBackground(Color.CYAN);
          return tf;
     public void actionPerformed(ActionEvent e)
          int row = table.getSelectedRow();
          int col = table.getSelectedColumn();
          double nVal = 0.00;
          Object currCostVal;
          Object currSellVal;
          Double costVal;
          Double sellVal;
          double newSellVal;
          double currentCost;
          if(table.getSelectedColumn() == 1)
               currCostVal = table.getValueAt(row, col+1);
               currSellVal = table.getValueAt(row, col);
               costVal = new Double(currCostVal.toString());
               currentCost = costVal.doubleValue();
               sellVal = new Double(currSellVal.toString());
               newSellVal = sellVal.doubleValue();
               nVal = newSellVal*currentCost*100/100;
               System.out.println("Recommended sell-price after change: " + nVal);
          }else if(table.getSelectedColumn() == 2 )
                    currCostVal = table.getValueAt(row, col);
                    currSellVal = table.getValueAt(row, col-1);
                    costVal = new Double(currCostVal.toString());
                    currentCost = costVal.doubleValue();
                    sellVal = new Double(currSellVal.toString());
                    newSellVal = sellVal.doubleValue();
                    nVal = newSellVal*currentCost*100/100;
                    System.out.println("Recommended sell-price after change: " + nVal);
                    System.out.println("Cost column selected " + nVal);
}// end simple cell editor
class MTM extends DefaultTableModel
          MTM(int rows, int cols)
                    super(rows, cols);
public static void main(String args[])
          TE te = new TE("Test of table cell update");

JTable cell value

I have a custom cell renderer for JTable, and this cell renderer is also a listener for some event. The cell renderer receives new value as events, since it is a listener. The cell renderer must upadte this value as a table cell. Simple call this.setText does not work, as it must somehow call the "getTableCellRendererComponent" method of the TableCellRenderer interface that it implements. How can the cell renderer force the table to update itself, as the cell renderer has received his new value. What will be a good approach here?
TIA,
- Manish

Manish -
Would you be able to post your idea?
I have a column in a table that I added
a check box to so that the user can select
or deselect the data. Sometimes when
the check box is selected or deselected it
doesn't register until I click another field.
Would your idea work to correct this?
Thanks!

JTable inside JTable cell

Hello. I'm trying to see if it's at all possible to have a JTable inside a JTable cell. I tried modifying those 'JButton inside JCell' examples, to no avail - it seems I didn't actually grasp the idea.
so anyway - did anyone ever do that? have a table inside a table? anyone can point me in the right direction?
thanks.

Hello. I'm trying to see if it's at all possible to
have a JTable inside a JTable cell. I tried modifying
those 'JButton inside JCell' examples, to no avail -
it seems I didn't actually grasp the idea.It is possible, but I think it would make things confusing for the user. What exactly are you wanting to display?
>
so anyway - did anyone ever do that? have a table
inside a table? anyone can point me in the right
direction?You need a custom renderer and custom editor and most likely custom TableModels for each table. There are row height issues as well, especially if the rows/columns of the inner tables are variable. The getValueAt() method will require some thought. What is the value associated with all the cells in the inner table?
All in all, this is doable, but may not be desirable.
>
thanks.

Can not show the JCheckBox in JTable cell

I want to place a JCheckBox in one JTable cell, i do as below:
i want the column "d" be a check box which indicates "true" or "false".
String[] columnNames = {"a","b","c","d"};
Object[][] rowData = {{"", "", "", Boolean.FALSE}};
tableModel = new DefaultTableModel(rowData, columnNames);
dataTable = new JTable(tableModel);
dataTable.getColumnModel().getColumn(3).setCellEditor(new DefaultCellEditor(new JCheckBox()));
But when i run it, the "d" column show the string "false" or "true", not the check box i wanted.
I do not understand it, can you help me?
Thank you very much!
coral9527

Do not use DefaultTableModel, create your own table model and you should implement the method
getColumnClass to display the boolean as checkbox ...
I hope the following colde snippet helps you :
class MyModel extends AbstractTableModel {
          private String[] columnNames = {"c1",
"c2"};
public Object[][] data ={{Boolean.valueOf(true),"c1d1"}};
     public int getColumnCount() {
     //System.out.println("Calling getColumnCount");
     return columnNames.length;
public int getRowCount() {
//System.out.println("Calling row count");
return data.length;
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
return data[row][col];
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
* Don't need to implement this method unless your table's
* editable.
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
return true;
* Don't need to implement this method unless your table's
* data can change.
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);

Swing: when trying to get the values from a JTable inside an event handler

Hi,
I am trying to write a graphical interface to compute the Gauss Elimination procedure for solving linear systems. The class for computing the output of a linear system already works fine on console mode, but I am fighting a little bit to make it work with Swing.
I put two buttons (plus labels) and a JTextField . The buttons have the following role:
One of them gets the value from the JTextField and it will be used to the system dimension. The other should compute the solution. I also added a JTable so that the user can type the values in the screen.
So whenever the user hits the button Dimensiona the program should retrieve the values from the table cells and pass them to a 2D Array. However, the program throws a NullPointerException when I try to
do it. I have put the code for copying this Matrix inside a method and I call it from the inner class event handler.
I would thank you very much for the help.
Daniel V. Gomes
here goes the code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import AdvanceMath.*;
public class MathF2 extends JFrame {
private JTextField ArrayOfFields[];
private JTextField DimOfSis;
private JButton Calcular;
private JButton Ativar;
private JLabel label1;
private JLabel label2;
private Container container;
private int value;
private JTable DataTable;
private double[][] A;
private double[] B;
private boolean dimensionado = false;
private boolean podecalc = false;
public MathF2 (){
super("Math Calcs");
Container container = getContentPane();
container.setLayout( new FlowLayout(FlowLayout.CENTER) );
Calcular = new JButton("Resolver");
Calcular.setEnabled(false);
Ativar = new JButton("Dimensionar");
label1 = new JLabel("Clique no bot�o para resolver o sistema.");
label2 = new JLabel("Qual a ordem do sistema?");
DimOfSis = new JTextField(4);
DimOfSis.setText("0");
JTable DataTable = new JTable(10,10);
container.add(label2);
container.add(DimOfSis);
container.add(Ativar);
container.add(label1);
container.add(Calcular);
container.add(DataTable);
for ( int i = 0; i < 10 ; i ++ ){
for ( int j = 0 ; j < 10 ; j++) {
DataTable.setValueAt("0",i,j);
myHandler handler = new myHandler();
Calcular.addActionListener(handler);
Ativar.addActionListener(handler);
setSize( 500 , 500 );
setVisible( true );
public static void main ( String args[] ){
MathF2 application = new MathF2();
application.addWindowListener(
new WindowAdapter(){
public void windowClosing (WindowEvent event)
System.exit( 0 );
private class myHandler implements ActionListener {
public void actionPerformed ( ActionEvent event ){
if ( event.getSource()== Calcular ) {
if ( event.getSource()== Ativar ) {
//dimensiona a Matriz A
if (dimensionado == false) {
if (DimOfSis.getText()=="0") {
value = 2;
} else {
value = Integer.parseInt(DimOfSis.getText());
dimensionado = true;
Ativar.setEnabled(false);
System.out.println(value);
} else {
Ativar.setEnabled(false);
Calcular.setEnabled(true);
podecalc = true;
try {
InitValores( DataTable, value );
} catch (Exception e) {
System.out.println("Erro ao criar matriz" + e );
private class myHandler2 implements ItemListener {
public void itemStateChanged( ItemEvent event ){
private void InitValores( JTable table, int n ) {
A = new double[n][n];
B = new double[n];
javax.swing.table.TableModel model = table.getModel();
for ( int i = 0 ; i < n ; i++ ){
for (int j = 0 ; j < n ; j++ ){
Object temp1 = model.getValueAt(i,j);
String temp2 = String.valueOf(temp1);
A[i][j] = Double.parseDouble(temp2);

What I did is set up a :
// This code will setup a listener for the table to handle a selection
players.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = players.getSelectionModel();
rowSM.addListSelectionListener(new Delete_Player_row_Selection(this));
//Class will take the event and call a method inside the Delete_Player object.
class Delete_Player_row_Selection
implements javax.swing.event.ListSelectionListener
Delete_Player adaptee;
Delete_Player_row_Selection (Delete_Player temp)
adaptee = temp;
public void valueChanged (ListSelectionEvent listSelectionEvent)
adaptee.row_Selection(listSelectionEvent);
in the row_Selection function
if(ex.getValueIsAdjusting()) //To remove double selection
return;
ListSelectionModel lsm = (ListSelectionModel) ex.getSource();
if(lsm.isSelectionEmpty())
System.out.println("EMtpy");
else
int selected_row = lsm.getMinSelectionIndex();
ResultSetTableModel model = (ResultSetTableModel) players.getModel();
String name = (String) model.getValueAt(selected_row, 1);
Integer id = (Integer) model.getValueAt(selected_row, 3);
This is how I got info out of a table when the user selected it

A problem to get the value of a selected cell

Hi all,
I am trying to get the value of a cell in JTable. The problem that I have is ListSelectionListener only listens if the selection changes(valueChanged method).
It means that if I select apple then rum, only rowSelectionModel is triggered, which means I do not get the index of the column from selectionModel of ColumnModel.
apple orange plum
rum sky blue
This is a piece of code from JTable tutorial that I modified by adding
selRow and selCol variables to keep track of the location so that I can get the value of the selected cell.
Thank you.
if (ALLOW_ROW_SELECTION) { // true by default
ListSelectionModel rowSM = table.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No rows are selected.");
} else {
int selectedRow = lsm.getMinSelectionIndex();
selRow = selectedRow;
System.out.println("Row " + selectedRow + " is now selected.");
else {
table.setRowSelectionAllowed(false);
if (ALLOW_COLUMN_SELECTION) { // false by default
if (ALLOW_ROW_SELECTION) {
table.setCellSelectionEnabled(true);
table.setColumnSelectionAllowed(true);
ListSelectionModel colSM = table.getColumnModel().getSelectionModel();
colSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No columns are selected.");
} else {
int selectedCol = lsm.getMinSelectionIndex();
selCol = selectedCol;
System.out.println("Column " + selCol + " is now selected.");
System.out.println("Row " + selRow + " is now selected.");
javax.swing.table.TableModel model = table.getModel();
// I get the value here
System.out.println("Value: "+model.getValueAt(selRow,selCol));
}

maybe you can try with :
table.getSelectedColumn()
table.getSelectedRow()
:)

How to write an element in a JTable Cell

Probably it's a stupid question but I have this problem:
I have a the necessity to build a JTable in which, when I edit a cell and I push a keyboard button, a new Frame opens to edit the content of the cell.
But the problem is how to write something in the JTable cell, before setting its model. Because, I know, setCellAT() method of JTree inserts the value in the model and not in the table view. And repainting doesn't function!
What to do??
Thanks

Hi there
Depending on your table model you should normally change the "cell value" of the tablemodel.
This could look like:
JTable table = new JTable();
TableModel model = table.getModel();
int rowIndex = 0, columnIndex = 0;
model.setValueAt("This is a test", rowIndex, columnIndex);
The tablemodel should then fire an event to the view (i.e. JTable) and the table should be updated.
Hope this helps you

Problem in jtable cell

Hi
I am facing one problem. there is some data should be displayed in Jtable cell.
The thing is that the whole data shall be visible in the cell.. for this I am writing one renderer.. but I could not find the desire solution.. please check it out
class Item_Details extends JFrame {
    ApsJTable itemTable = null;
     ApsJTable imageTable = null;
     ArrayList data = new ArrayList();
     String[] columns = new String[2];
     ArrayList data1 = new ArrayList();
     String[] columns1 = new String[2];
     ItemTableModel itemTableModel = null;
     ItemTableModel itemTableModel1 = null;
     public Item_Details()
          super("Item Details");
         this.setSize(600,100);
          this.setVisible(true);
         init();
     private void init(){
          ////////////// Get data for first Table Model ////////////////////////////
          data = getRowData();
          columns = getColData();
          System.out.println(columns[0]);
         itemTableModel = new ItemTableModel(data,columns);
         /////////////Get Data for Second Table Model //////////////////////////////
          try{
                    data1 = getRowData1();
             }catch(Exception e){}
          columns1 = getColumns1();
         itemTableModel1 = new ItemTableModel(data1,columns1);
         ///////////// Set Data In Both Table Model //////////////////////////////////
          itemTable = new ApsJTable(itemTableModel);
          imageTable = new ApsJTable(itemTableModel1);
          this.itemTable.setShowGrid(false);
          this.imageTable.setShowGrid(false);
          this.itemTable.setColumnSelectionAllowed(false);
          this.imageTable.setColumnSelectionAllowed(false);
          System.out.println(itemTable.getColumnCount());
          this.imageTable.setRowHeight(getImageHeight()+3);
          JScrollPane tableScrollPane = new JScrollPane(this.imageTable,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
          tableScrollPane.setRowHeaderView(this.itemTable);
          tableScrollPane.getRowHeader().setPreferredSize(new Dimension(800, 0));
          itemTable.getTableHeader().setReorderingAllowed(false);
          itemTable.setColumnSelectionAllowed(false);
          //itemTable.setRowHeight(25);
          itemTable.setCellSelectionEnabled(false);
          itemTable.setFocusable(false);
          imageTable.getTableHeader().setReorderingAllowed(false);
          imageTable.setFocusable(false);
          imageTable.setCellSelectionEnabled(false);
          //tableScrollPane.setOpaque(false);
          itemTable.setAutoCreateColumnsFromModel(false);
          int columnCount = itemTable.getColumnCount();
          for(int k=0;k<columnCount;k++)
          /*     TableCellRenderer renderer = null;
               TableCellEditor editor = null;
               renderer = new TextAreaCellRenderer();     // NEW
               editor = new TextAreaCellEditor();
               TableColumn column = new TableColumn(k,itemTable.getColumnModel().getColumn(k).getWidth(),renderer, editor);
                    itemTable.addColumn(column);*/
               itemTable.getColumnModel().getColumn(k).setCellRenderer(new MultiLineCellRenderer());
               //itemTable.getColumnModel().getColumn(k).setCellEditor(new TextAreaCellEditor());
////////////---------------------- Here background color is being set--------------//////////////////
          this.imageTable.getParent().setBackground(Color.WHITE);
          this.itemTable.getParent().setBackground(Color.WHITE);
          tableScrollPane.setCorner(ScrollPaneConstants.UPPER_LEFT_CORNER,this.itemTable.getTableHeader());
          getContentPane().add(tableScrollPane,BorderLayout.CENTER);
          getContentPane().setVisible(true);
     public static void main(String[] str){
          com.incors.plaf.alloy.AlloyLookAndFeel.setProperty("alloy.licenseCode", "2005/05/28#[email protected]#1v2pej6#1986ew");
          try {
            javax.swing.LookAndFeel alloyLnF = new com.incors.plaf.alloy.AlloyLookAndFeel();
            javax.swing.UIManager.setLookAndFeel(alloyLnF);
          } catch (javax.swing.UnsupportedLookAndFeelException ex) {
          ex.printStackTrace();
          Item_Details ID = new Item_Details();
          ID.setVisible(true);
public ArrayList getRowData()
     ArrayList rowData=new ArrayList();
     Hashtable item = new Hashtable();
     item.put(new Long(0),new String("Item No:"));
     item.put(new Long(1),new String("RED-1050"));
     rowData.add(0,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Description:"));
     item.put(new Long(1),new String("SYSTEM 18 mbh COOLING 13 mbh HEATING 230/208 v POWER AIRE "));
     rowData.add(1,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Stage:"));
     item.put(new Long(1),new String("Draft"));
     rowData.add(2,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Price: "));
     item.put(new Long(1),new String(" 999.00"));
     rowData.add(3,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Features:"));
     item.put(new Long(1),new String("SYSTEM COOLING & HEATING 12 mbh 230/208 v POWER AIRE SYSTEM1234 COOLING & HEATING 12 mbh 230/208 v POWER AIRE "));
     rowData.add(4,item);
     /*item.put(new Long(0),new String("Family Sequence"));
     item.put(new Long(1),new String("8.00"));
     rowData.add(5,item);
     item.put(new Long(0),new String("Family Sequence"));
     item.put(new Long(1),new String("8.00"));
     rowData.add(6,item);
     item.put(new Long(0),new String("Family Sequence"));
     item.put(new Long(1),new String("8.00"));
     rowData.add(7,item);
     return rowData;
public String[] getColData()
     String[] colData = new String[]{"Attribute","Value"};
     return colData;
public ArrayList getRowData1()throws MalformedURLException{
     ArrayList rowData = new ArrayList();
     Hashtable item = new Hashtable();
     String str = new String("http://biis:8080/assets/PRIMPRIM/Adj_BeacM_Small.jpg");
     URL url = new URL(str);
     ImageIcon ic = new ImageIcon(url);
     ImageIcon scaledImage = new ImageIcon(ic.getImage().getScaledInstance(getImageHeight(), -1,Image.SCALE_SMOOTH));
     item.put(new Long(0), scaledImage);
     rowData.add(0,item);
     String str1 = new String("http://biis:8080/assets/PRIMPRIM/Adj_BeacM_Small.jpg");
     URL url1 = new URL(str1);
     ImageIcon ic1 = new ImageIcon(url1);
     ImageIcon scaledImage1 = new ImageIcon(ic1.getImage().getScaledInstance(120, -1,Image.SCALE_DEFAULT));
     item.put(new Long(0),scaledImage1);
     rowData.add(1,item);
     return rowData;
public String[] getColumns1(){
     String[] colData = new String[]{"Image"};
     return colData;
public int getImageHeight(){
     ImageIcon ic = new ImageIcon("c:\\image\\ImageNotFound.gif");
     return ic.getIconHeight();
class MultiLineCellRenderer extends JTextArea implements TableCellRenderer {
       public MultiLineCellRenderer() {
            setLineWrap(true);
            setWrapStyleWord(true);
         JScrollPane m_scroll = new JScrollPane(this,
                   JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                   JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
         setOpaque(true);
       public Component getTableCellRendererComponent(JTable table, Object value,
                    boolean isSelected, boolean hasFocus, int row, int column) {
            /*if (isSelected) {
           setForeground(table.getSelectionForeground());
           setBackground(table.getSelectionBackground());
         } else {
           setForeground(table.getForeground());
           setBackground(table.getBackground());
        // setFont(table.getFont());
        /* if (hasFocus) {
           setBorder( UIManager.getBorder("Table.focusCellHighlightBorder") );
           if (table.isCellEditable(row, column)) {
             setForeground( UIManager.getColor("Table.focusCellForeground") );
             setBackground( UIManager.getColor("Table.focusCellBackground") );
         } else {
           setBorder(new EmptyBorder(1, 2, 1, 2));
         int width = table.getColumnModel().getColumn(column).getWidth();
          //setSize(width, 1000);
          int rowHeight = getPreferredSize().height;
          if (table.getRowHeight(row) != rowHeight)
               table.setRowHeight(row, rowHeight);
         setText((value == null) ? "" : value.toString());
         return this;
     }what wrong with this code..
Thanks

In summary, you have one or more columns for which the data must be wholly visible - correct? If you need all the columns to show the whole of their data, you are goinf to have to expand the table, otherwise you can expand a column with something like
myTable.getColumnModel().getColumn(whichever).setPreferredWidth(whatever);

Problem in JTable cell renderer

Hi
One problem in JTable cell. Actually I am using two tables while I am writing renderer for word raping in first table .. but it is affected in last column only remain is not being effected�. Please chaek it out what is exact I am missing�
Thanks
package com.apsiva.tryrowmerge;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.EventObject;
import java.util.Hashtable;
import java.net.*;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
import javax.swing.event.*;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
class Item_Details extends JFrame {
    ApsJTable itemTable = null;
     ApsJTable imageTable = null;
     ArrayList data = new ArrayList();
     String[] columns = new String[2];
     ArrayList data1 = new ArrayList();
     String[] columns1 = new String[2];
     ItemTableModel itemTableModel = null;
     ItemTableModel itemTableModel1 = null;
     public Item_Details()
          super("Item Details");
         this.setSize(600,100);
         this.setBackground(Color.WHITE);
          this.setVisible(true);
         init();
     private void init(){
          ////////////// Get data for first Table Model ////////////////////////////
          data = getRowData();
          columns = getColData();
          System.out.println(columns[0]);
         itemTableModel = new ItemTableModel(data,columns);
         /////////////Get Data for Second Table Model //////////////////////////////
          try{
                    data1 = getRowData1();
             }catch(Exception e){}
          columns1 = getColumns1();
         itemTableModel1 = new ItemTableModel(data1,columns1);
         ///////////// Set Data In Both Table Model //////////////////////////////////
          itemTable = new ApsJTable(itemTableModel);
          imageTable = new ApsJTable(itemTableModel1);
          this.itemTable.setShowGrid(false);
          this.imageTable.setShowGrid(false);
          this.itemTable.setColumnSelectionAllowed(false);
          this.imageTable.setColumnSelectionAllowed(false);
          System.out.println(itemTable.getColumnCount());
          this.imageTable.setRowHeight(getImageHeight()+3);
          JScrollPane tableScrollPane = new JScrollPane(this.imageTable,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
          tableScrollPane.setRowHeaderView(this.itemTable);
          //itemTable.getColumnModel().getColumn(0).setMaxWidth(200);
          itemTable.getColumnModel().getColumn(0).setPreferredWidth(200);
          itemTable.getColumnModel().getColumn(1).setPreferredWidth(600);
          tableScrollPane.getRowHeader().setPreferredSize(new Dimension(800, 0));
          itemTable.getTableHeader().setResizingAllowed(false);
          itemTable.getTableHeader().setReorderingAllowed(false);
          itemTable.setColumnSelectionAllowed(false);
          //itemTable.setRowHeight(25);
          itemTable.setCellSelectionEnabled(false);
          itemTable.setFocusable(false);
          imageTable.getTableHeader().setReorderingAllowed(false);
          imageTable.setFocusable(false);
          imageTable.setCellSelectionEnabled(false);
          //tableScrollPane.setOpaque(false);
          itemTable.setAutoCreateColumnsFromModel(false);
          int columnCount = itemTable.getColumnCount();
          for(int k=0;k<columnCount;k++)
               TableCellRenderer renderer = null;
               TableCellEditor editor = null;
               renderer = new TextAreaCellRenderer();     // NEW
          //     editor = new TextAreaCellEditor();
          //     TableColumn column = new TableColumn(k,itemTable.getColumnModel().getColumn(k).getWidth(),renderer, editor);
               System.out.println(k);
               itemTable.getColumnModel().getColumn(k).setCellRenderer(renderer);
               //itemTable.getColumnModel().getColumn(k).setCellEditor(editor);
               /*itemTable.getColumnModel().getColumn(1).setCellRenderer(new TextAreaCellRenderer());
               itemTable.getColumnModel().getColumn(1).setCellEditor(new TextAreaCellEditor());*/
//               itemTable.setShowGrid(false);
               //itemTable.addColumn(column);
               //itemTable.getColumnModel().getColumn(k).setCellRenderer(new MultiLineCellRenderer());
               //itemTable.getColumnModel().getColumn(k).setCellEditor(new TextAreaCellEditor());
////////////---------------------- Here background color is being set--------------//////////////////
          this.imageTable.getParent().setBackground(Color.WHITE);
          this.itemTable.getParent().setBackground(Color.WHITE);
          tableScrollPane.setCorner(ScrollPaneConstants.UPPER_LEFT_CORNER,this.itemTable.getTableHeader());
          getContentPane().add(tableScrollPane,BorderLayout.CENTER);
          getContentPane().setVisible(true);
     public static void main(String[] str){
          com.incors.plaf.alloy.AlloyLookAndFeel.setProperty("alloy.licenseCode", "2005/05/28#[email protected]#1v2pej6#1986ew");
          try {
            javax.swing.LookAndFeel alloyLnF = new com.incors.plaf.alloy.AlloyLookAndFeel();
            javax.swing.UIManager.setLookAndFeel(alloyLnF);
          } catch (javax.swing.UnsupportedLookAndFeelException ex) {
          ex.printStackTrace();
          Item_Details ID = new Item_Details();
          ID.setVisible(true);
public ArrayList getRowData()
     ArrayList rowData=new ArrayList();
     Hashtable item = new Hashtable();
     item.put(new Long(0),new String("Item No:aaaaaaa aaaaaaaa aaaaaaaaa aaaaaa"));
     item.put(new Long(1),new String("RED-1050"));
     rowData.add(0,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Description:rt r trtrt rttrytrr tytry trytry tr tr rty thyjyhjhnhnhgg hhjhgjh"));
     item.put(new Long(1),new String("SYSTEM 18 mbh COOLING 13 mbh HEATING 230/208 v POWER AIRE "));
     rowData.add(1,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Stage:"));
     item.put(new Long(1),new String("Draft"));
     rowData.add(2,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Price: "));
     item.put(new Long(1),new String("999.00"));
     rowData.add(3,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Features:"));
     item.put(new Long(1),new String("SYSTEM COOLING & HEATING 12 mbh 230/208 v POWER AIRE SYSTEM1234 COOLING & HEATING 12 mbh 230/208 v POWER AIRE "));
     rowData.add(4,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Features:"));
     item.put(new Long(1),new String("SYSTEM COOLING & HEATING 12 mbh 230/208 v POWER AIRE SYSTEM1234 COOLING & HEATING 12 mbh 230/208 v POWER AIRE "));
     rowData.add(5,item);
     item = new Hashtable();
     item.put(new Long(0),new String("Features:"));
     item.put(new Long(1),new String("SYSTEM COOLING & HEATING 12 mbh 230/208 v POWER AIRE SYSTEM1234 COOLING & HEATING 12 mbh 230/208 v POWER AIRE "));
     rowData.add(6,item);
     /*item.put(new Long(0),new String("Family Sequence"));
     item.put(new Long(1),new String("8.00"));
     rowData.add(5,item);
     item.put(new Long(0),new String("Family Sequence"));
     item.put(new Long(1),new String("8.00"));
     rowData.add(6,item);
     item.put(new Long(0),new String("Family Sequence"));
     item.put(new Long(1),new String("8.00"));
     rowData.add(7,item);
     return rowData;
public String[] getColData()
     String[] colData = new String[]{"Attribute","Value"};
     return colData;
public ArrayList getRowData1()throws MalformedURLException{
     ArrayList rowData = new ArrayList();
     Hashtable item = new Hashtable();
     String str = new String("http://biis:8080/assets/PRIMPRIM/Adj_BeacM_Small.jpg");
     URL url = new URL(str);
     ImageIcon ic = new ImageIcon(url);
     ImageIcon scaledImage = new ImageIcon(ic.getImage().getScaledInstance(getImageHeight(), -1,Image.SCALE_SMOOTH));
     item.put(new Long(0), scaledImage);
     rowData.add(0,item);
     String str1 = new String("http://biis:8080/assets/PRIMPRIM/Adj_BeacM_Small.jpg");
     URL url1 = new URL(str1);
     ImageIcon ic1 = new ImageIcon(url1);
     ImageIcon scaledImage1 = new ImageIcon(ic1.getImage().getScaledInstance(120, -1,Image.SCALE_DEFAULT));
     item.put(new Long(0),scaledImage1);
     rowData.add(1,item);
     return rowData;
public String[] getColumns1(){
     String[] colData = new String[]{"Image"};
     return colData;
public int getImageHeight(){
     ImageIcon ic = new ImageIcon("c:\\image\\ImageNotFound.gif");
     return ic.getIconHeight();
class TextAreaCellRenderer extends JTextArea implements TableCellRenderer
     public TextAreaCellRenderer() {
          setEditable(false);
          setLineWrap(true);
          setWrapStyleWord(true);
     public Component getTableCellRendererComponent(JTable table,
          Object value, boolean isSelected, boolean hasFocus,
          int nRow, int nCol)
          if (value instanceof String)
               setText((String)value);
          // Adjust row's height
          int width = table.getColumnModel().getColumn(nCol).getWidth();
          setSize(width, 1000);
          int rowHeight = getPreferredSize().height;
          if (table.getRowHeight(nRow) != rowHeight)
               table.setRowHeight(nRow, rowHeight);
          this.setBackground(Color.WHITE);
          return this;

I think Problem is between these code only
for(int k=0;k<columnCount;k++)
               TableCellRenderer renderer = null;
               TableCellEditor editor = null;
               renderer = new TextAreaCellRenderer();
                                                            itemTable.getColumnModel().getColumn(k).setCellRenderer(renderer);or in this renderer
class TextAreaCellRenderer extends JTextArea implements TableCellRenderer
     public TextAreaCellRenderer() {
          setEditable(false);
          setLineWrap(true);
          setWrapStyleWord(true);
     public Component getTableCellRendererComponent(JTable table,
          Object value, boolean isSelected, boolean hasFocus,
          int nRow, int nCol)
          if (value instanceof String)
               setText((String)value);
          // Adjust row's height
          int width = table.getColumnModel().getColumn(nCol).getWidth();
          setSize(width, 1000);
          int rowHeight = getPreferredSize().height;
          if (table.getRowHeight(nRow) != rowHeight)
               table.setRowHeight(nRow, rowHeight);
          this.setBackground(Color.WHITE);
          return this;
}

Hiding a value available in JTable Cell

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