How to listen for resizing of JTable column

Is there anyway to tell when the columns in a JTable are being resized by the user? I couldn't find any listeners or anything that will tell you when the user is dragging the column width with the mouse.
Thanks.

Use ColumnModelListener as shown below:-
          table.getColumnModel().addColumnModelListener(new TableColumnModelListener() {
               public void columnAdded(TableColumnModelEvent e) {
               public void columnMoved(TableColumnModelEvent e) {
               public void columnRemoved(TableColumnModelEvent e) {
               public void columnMarginChanged(ChangeEvent e) {
               public void columnSelectionChanged(ListSelectionEvent e) {
          });

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]);

How to catch selected text in JTable Column

Hi there,
I am learning JTable. Need help for How to get the selected text from the JTable Column which is set to be editable.
for example in JTextFiled you have method on getSelectedText(), is there any method for tracking the selected text.
Thanks in advance
Minal

Here's an example of the model I used in my JTable. Not the "getValueAt" method & "getRecordAt" method. You will have to have a Record object - but it only contains the attributes of an inserted record (with appropriate getters & setters). Hope this helps.
public class FileModel5 extends AbstractTableModel
public boolean isEditable = false;
protected static int NUM_COLUMNS = 3;
// initialize number of rows to start out with ...
protected static int START_NUM_ROWS = 0;
protected int nextEmptyRow = 0;
protected int numRows = 0;
static final public String file = "File";
static final public String mailName = "Mail Id";
static final public String postName = "Post Office Id";
static final public String columnNames[] = {"File", "Mail Id", "Post Office Id"};
// List of data
protected Vector data = null;
public FileModel5()
data = new Vector();
public boolean isCellEditable(int rowIndex, int columnIndex)
// The 2nd & 3rd column or Value field is editable
if(isEditable)
if(columnIndex > 0)
return true;
return false;
* 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();
* Retrieves number of columns
public synchronized int getColumnCount()
return NUM_COLUMNS;
* Get a column name
public String getColumnName(int col)
return columnNames[col];
* Retrieves number of records
public synchronized int getRowCount()
if (numRows < START_NUM_ROWS)
return START_NUM_ROWS;
else
return numRows;
* Returns cell information of a record at location row,column
public synchronized Object getValueAt(int row, int column)
try
FileRecord5 p = (FileRecord5)data.elementAt(row);
switch (column)
case 0:
return (String)p.file;
case 1:
return (String)p.mailName;
case 2:
return (String)p.postName;
catch (Exception e)
return "";
public void setValueAt(Object aValue, int row, int column)
FileRecord5 arow = (FileRecord5)data.elementAt(row);
arow.setElementAt((String)aValue, column);
fireTableCellUpdated(row, column);
* Returns information of an entire record at location row
public synchronized FileRecord5 getRecordAt(int row) throws Exception
try
return (FileRecord5)data.elementAt(row);
catch (Exception e)
throw new Exception("Record not found");
* Used to add or update a record
* @param tableRecord
public synchronized void updateRecord(FileRecord5 tableRecord)
String file = tableRecord.file;
FileRecord5 p = null;
int index = -1;
boolean found = false;
boolean addedRow = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
{ //update
data.setElementAt(tableRecord, index);
else
if (numRows <= nextEmptyRow)
//add a row
numRows++;
addedRow = true;
index = nextEmptyRow;
data.addElement(tableRecord);
//Notify listeners that the data changed.
if (addedRow)
nextEmptyRow++;
fireTableRowsInserted(index, index);
else
fireTableRowsUpdated(index, index);
* Used to delete a record
public synchronized void deleteRecord(String file)
FileRecord5 p = null;
int index = -1;
boolean found = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
data.removeElementAt(i);
nextEmptyRow--;
numRows--;
fireTableRowsDeleted(START_NUM_ROWS, numRows);
* Clears all records
public synchronized void clear()
int oldNumRows = numRows;
numRows = START_NUM_ROWS;
data.removeAllElements();
nextEmptyRow = 0;
if (oldNumRows > START_NUM_ROWS)
fireTableRowsDeleted(START_NUM_ROWS, oldNumRows - 1);
fireTableRowsUpdated(0, START_NUM_ROWS - 1);
* Loads the values into the combo box within the table for mail id
public void setUpMailColumn(JTable mapTable, ArrayList mailList)
TableColumn col = mapTable.getColumnModel().getColumn(1);
javax.swing.JComboBox comboMail = new javax.swing.JComboBox();
int s = mailList.size();
for(int i=0; i<s; i++)
comboMail.addItem(mailList.get(i));
col.setCellEditor(new DefaultCellEditor(comboMail));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for mail Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Mail Id to see a list of choices");
* Loads the values into the combo box within the table for post office id
public void setUpPostColumn(JTable mapTable, ArrayList postList)
TableColumn col = mapTable.getColumnModel().getColumn(2);
javax.swing.JComboBox combo = new javax.swing.JComboBox();
int s = postList.size();
for(int i=0; i<s; i++)
combo.addItem(postList.get(i));
col.setCellEditor(new DefaultCellEditor(combo));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for post office Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Post Office Id to see a list of choices");
}

Document Listener for JTextArea in JTable

I am trying to implement a DocumentListener for JTextArea in JTable, but its not happening.
Can someone tell me what's wrong. SSCCE below.
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.text.Document;
public class MyTable_TextArea extends JTable {
     private DefaultTableModel defaultTableModel;
     private Object[][] dataArray;
     private Object[] columnNameArray;
     public final int TEXT_COLUMN = 0;
     // column headers
     public static final String TEXT_COLUMN_HEADER = "Text";
     // text area
     TextFieldRenderer3 textFieldRenderer3;
      * constructor
      * @param variableNameArray
      * @param columnNameArray
     public MyTable_TextArea(Object[][] variableNameArray, Object[] columnNameArray) {
          this.dataArray = variableNameArray;
          this.columnNameArray = columnNameArray;
          defaultTableModel = new DefaultTableModel(variableNameArray, columnNameArray);
          this.setModel(defaultTableModel)     ;
          // text field
        textFieldRenderer3 = new TextFieldRenderer3();
          MyDocumentListener myListener = new MyDocumentListener();
          textFieldRenderer3.getDocument().addDocumentListener(myListener);
        TableColumn modelColumn = this.getColumnModel().getColumn(TEXT_COLUMN);
          modelColumn.setCellRenderer(textFieldRenderer3);
      * nested class
     class MyDocumentListener implements DocumentListener {
         String newline = "\n";
         public void insertUpdate(DocumentEvent e) {
              System.out.println ("insert update");
             updateLog(e, "inserted into");
         public void removeUpdate(DocumentEvent e) {
              System.out.println ("remove update");
             updateLog(e, "removed from");
         public void changedUpdate(DocumentEvent e) {
             //Plain text components do not fire these events
         public void updateLog(DocumentEvent e, String action) {
             Document doc = (Document)e.getDocument();
             int changeLength = e.getLength();
             textFieldRenderer3.append(
                 changeLength + " character" +
                 ((changeLength == 1) ? " " : "s ") +
                 action + doc.getProperty("name") + "." + newline +
                 " Text length = " + doc.getLength() + newline);
      * @param args
     public static void main(String[] args) {
          try{
               UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
          catch (Exception e){
               e.printStackTrace();
         String[] columnNameArray = {
                   TEXT_COLUMN_HEADER,
                   "1",
                   "2",
          Object[][] dataArray = {      {"", "", ""},      };
          final MyTable_TextArea panel = new MyTable_TextArea(dataArray, columnNameArray);
          final JFrame frame = new JFrame();
          frame.getContentPane().add(new JScrollPane(panel));
          frame.setTitle("My Table");
          frame.setPreferredSize(new Dimension(500, 200));
          frame.addWindowListener(new WindowAdapter(){
               @Override
               public void windowClosing(WindowEvent e) {
          frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
          frame.setLocation(300, 200);
          frame.pack();
          frame.setVisible(true);
class TextFieldRenderer3 extends JTextArea implements TableCellRenderer {
     Icon defaultIcon;
     boolean isChecked = false;
     public TextFieldRenderer3() {
          System.out.println ("TextFieldRenderer()");
          setToolTipText("Double click to type");
     @Override
     public Component getTableCellRendererComponent(JTable table,
               Object value,
               boolean isSelected,
               boolean hasFocus,
               int row,
               int column) {
          System.out.println ("TextFieldRenderer.getTableCellRendererComponent() row/column: " + row + "\t"+ column);
          return this;
}

I've implemented in the cell editor. I don't see how to get the value being typed (and nothing appears in the text area)
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.EventObject;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.event.CellEditorListener;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.text.Document;
public class MyTable_TextArea extends JTable {
     private DefaultTableModel defaultTableModel;
     private Object[][] dataArray;
     private Object[] columnNameArray;
     public final int TEXT_COLUMN = 0;
     // column headers
     public static final String TEXT_COLUMN_HEADER = "Text";
     // text area
     TextAreaEditor textAreaEditor;
      * constructor
      * @param variableNameArray
      * @param columnNameArray
     public MyTable_TextArea(Object[][] variableNameArray, Object[] columnNameArray) {
          this.dataArray = variableNameArray;
          this.columnNameArray = columnNameArray;
          defaultTableModel = new DefaultTableModel(variableNameArray, columnNameArray);
          this.setModel(defaultTableModel)     ;
          // text field
        textAreaEditor = new TextAreaEditor();
          MyDocumentListener myListener = new MyDocumentListener();
          textAreaEditor.getDocument().addDocumentListener(myListener);
        TableColumn modelColumn = this.getColumnModel().getColumn(TEXT_COLUMN);
          modelColumn.setCellEditor(textAreaEditor);
      * nested class
     class MyDocumentListener implements DocumentListener {
         String newline = "\n";
         public void insertUpdate(DocumentEvent e) {
              System.out.println ("insert update");
             updateLog(e, "inserted into");
         public void removeUpdate(DocumentEvent e) {
              System.out.println ("remove update");
             updateLog(e, "removed from");
         public void changedUpdate(DocumentEvent e) {
             //Plain text components do not fire these events
         public void updateLog(DocumentEvent e, String action) {
             Document doc = (Document)e.getDocument();
             int changeLength = e.getLength();
             textAreaEditor.append(
                 changeLength + " character" +
                 ((changeLength == 1) ? " " : "s ") +
                 action + doc.getProperty("name") + "." + newline +
                 " Text length = " + doc.getLength() + newline);
      * @param args
     public static void main(String[] args) {
          try{
               UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
          catch (Exception e){
               e.printStackTrace();
         String[] columnNameArray = {
                   TEXT_COLUMN_HEADER,
                   "1",
                   "2",
          Object[][] dataArray = {      {"", "", ""},      };
          final MyTable_TextArea panel = new MyTable_TextArea(dataArray, columnNameArray);
          final JFrame frame = new JFrame();
          frame.getContentPane().add(new JScrollPane(panel));
          frame.setTitle("My Table");
          frame.setPreferredSize(new Dimension(500, 200));
          frame.addWindowListener(new WindowAdapter(){
               @Override
               public void windowClosing(WindowEvent e) {
          frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
          frame.setLocation(300, 200);
          frame.pack();
          frame.setVisible(true);
class TextAreaEditor extends JTextArea implements TableCellEditor {
     Icon defaultIcon;
     boolean isChecked = false;
     public TextAreaEditor() {
          System.out.println ("TextAreaEditor()");
          setToolTipText("Double click to type");
     @Override
     public Component getTableCellEditorComponent(JTable arg0,
               Object arg1,
               boolean arg2,
               int arg3,
               int arg4) {
          System.out.println ("TextAreaEditor() arg1: " + arg1 + "arg2: " + arg2 + " arg3: " + arg3 + " arg4: " + arg4 );
          return null;
     @Override
     public void addCellEditorListener(CellEditorListener arg0) {
          System.out.println ("TextAreaEditor().addCellEditorListener");
     @Override
     public void cancelCellEditing() {
          System.out.println ("TextAreaEditor().cancelCellEditing");
     @Override
     public Object getCellEditorValue() {
          System.out.println ("TextAreaEditor().getCellEditorValue");
          return null;
     @Override
     public boolean isCellEditable(EventObject arg0) {
          System.out.println ("TextAreaEditor().isCellEditable");
          return true;
     @Override
     public void removeCellEditorListener(CellEditorListener arg0) {
          System.out.println ("TextAreaEditor().removeCellEditorListener");
     @Override
     public boolean shouldSelectCell(EventObject arg0) {
          System.out.println ("TextAreaEditor().shouldSelectCell");
          return false;
     @Override
     public boolean stopCellEditing() {
          System.out.println ("TextAreaEditor().stopCellEditing");
          return false;
}

How to listen for key press when air app does not have focus

Hi,
I am developing a application in air and part of the functionality I need is the ability for the app to listen for when a specific key is pressed, even when the air app does not have focus.
Is there support for this for windows or mac? If not, how might this be accomplished? ANE?

Ok Mr. Smartass...Ok
I'm building a browser that is always open, and when
a user presses Ctrl+F1 (notice, just those two keys,
I don't care what else they press...) the browser
will open up. That way, you don't have to wait for it
to load all the time.You have two ideas here. One is having a universal key map that always gets ctrl-f1 sent to your app. The other is a program that is constantly running so that you don't have to wait for it to open up. The former is not possible (and this is a good thing) As warneria and I have been saying, it is bad design for an app to try to force an OS to implement this kind of feature.
If you're not going to help please don't post at all;
it's a waste of time for both you, me, and anyone
else who may need help on the same subject. Why wouldBelieve it or not, I am helping you.
See
http://www.google.com/search?hl=en&lr=&q=programming+code+side+effects
and
http://www.faqs.org/docs/artu/ch04s02.html
"Doug McIlroy's advice to �Do one thing well� is usually interpreted as being about simplicity. But it's also, implicitly and at least as importantly, about orthogonality."
anyone in their right mind who's trying to steal
people's passwords come out and say, "I'm not trying
to steal people's passwords!"wait, your question is why would someone trying to steal passwords say I'm not trying to steal passwords? I think duplicitous people in their right minds might try to trick you that way.
Beyond that, even if you're not a malicious hacker - and I am sure you are not - if someone posts a solution to your problem, malicious coders then will have learned how to do it. If you think you're programming or using these forums in a bubble, you are not.

How to listen for inputs without a component? For creating bots

I mean, for example, I want to write a a program that listens for keys f12 to (for example) skip the track in a media player and f11 to skip back. Thinks like the like :P. But I want to do this without any component, becasue the program won't have the focus at all.
If it is needed to create a dll just tell as much as you pacience affords.

I mean, for example, I want to write a a program that
listens for keys f12 to (for example) skip the track
in a media player and f11 to skip back. Thinks like
the like :P. But I want to do this without any
component, becasue the program won't have the focus
at all. >Translation : I need a system keylogger.
You can't do this in Java. And it will be OS specific.

How to listen for cell selection changes within a JTable

Problem: my table has 8 columns, with 4 of them containing very large text (up to 1000 chars). Solution is to set the initial size these columns so that the 1st 20 chars are visible, and if one of these columns gains focus/selection via mouse-clicking/tabbing/arrow keys, the entire text is shown in a JTextArea below the table.
I added a ListSelectionListener to the table, but this only informs me when the row selection has changed.
I added a FocusListener to the table, but this only informs me when the table gains/loses focus, not when it's been changed within.
I added a TableColumnModelListener to the TableColumnModel, but this only informs me when the column selection has changed.
I didn't bother with MouseListener as this won't handle change of selection via tabbing.
The LSL got me half way there, and the TCML got me the other half. Any ideas on how to combine?
Or is there something obvious that I'm missing?

Walter Laan wrote:
Use both and call the same method which updates the text area based on the current selected (or focused == lead selection index) cell.Yeah - that's what I figured. I just didn't know if there was a magic bullet (i.e., a single listener) out there that I was missing.
While you are at it, also add a table model listener which calls the same method if the selected cell is updated.I'll keep that in mind, but it's not necessary in this particular case. The table cells in question will be uneditable. The text area will have supporting Edit/Save/Cancel buttons.

How to use JButton as a JTable column header?

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

You might want to check this example and use it accordingly for your requirements.
http://www2.gol.com/users/tame/swing/examples/JTableExamples5.html
Reason: The reason you're unable to perform actions on JButton is JTableHeader doesn't relay the mouse events to your JButtons.
I hope this helps.
have fun, ganesh.

How to select for insert a long column through database link?

How may a long column (for example a sql server 2000 text column) be selected for insert into a clob column in table in 10g over a database link without invoking ora-00997?
I've tried using dbms_metadata_util.long2clob without success over a database link.

Is the remote database an Oracle database? Or are you selecting data from SQL Server 2000 over a database link via Heterogeneous Services? What is the data type of the column in the remote database (LONG? TEXT? Something else?)?
Justin

Listener for CheckBoxes in JTable

Hi,
I have a table that displays a checkbox in one of the fields. Which event handler/ listener should I use? Eg: Checkbox listener, List listener or otherwise?
A change in the checkbox value (tick or untick) will trigger recalculation.
Thanks.

I can't really understand your problem.
Here's a simple example that will print out the new check box state when you press the checkbox:
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
public class TableCheckboxListenerExample {
    public static void main(String[] args) {
        try {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JDialog.EXIT_ON_CLOSE);
            DefaultTableModel model = new DefaultTableModel(new Object[][] {{Boolean.FALSE, "Row 1"}, {Boolean.TRUE, "Row 2"}}, new String[] {"col1", "col2"}) {
                public Class<?> getColumnClass(int columnIndex) {
                    if (getRowCount() > 0 && getValueAt(0, columnIndex) != null)
                        return getValueAt(0, columnIndex).getClass();
                    return super.getColumnClass(columnIndex);
            model.addTableModelListener(new TableModelListener() {
                public void tableChanged(TableModelEvent e) {
                    int row = e.getFirstRow();
                    int column = e.getColumn();
                    TableModel model = (TableModel)e.getSource();
                    Object data = model.getValueAt(row, column);
                    if (data instanceof Boolean)
                        System.out.println("Value changed in Row: " + row + " Column: " + column + " New Value = " + data);
            JTable table = new JTable(model);
            frame.add(new JScrollPane(table));
            frame.pack();
            frame.setVisible(true);
        catch (Exception e) {e.printStackTrace();}
}

Listener for selection in JTable

Hello everybody,
following problem. I have to check, if an selection in an JTable is valid or not. For this purpose I need to have a listener, which is invoked when a line or multiple lines of a JTable have been selected.
Thanks for your help

you can use myTable.addMouseListener() to add a listener to the table;
then to get the row index where the event happened you can use:
myTable.rowAtPoint(yourEvent.getPoint());
for instance:
myTable.addMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent me){
//there you get the row index
int myIndex=myTable.rowAtPoint(me.getPoint());
});

How to have a combobox in JTable column header?

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

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

How display numeric datas in a JTable column on the right side?

Hallo !
I have a JTable using the AbstractTableModel.
How can I display the numeric values on the right side of the column?
Wolfgang

It works, if I overwrite the TabModel-method "getColumnClass". But I cannot use this, because in german I have a "," in a double an not a "." as comma. So I get an Exception if the table tries to format 123,34 as a double.
But I think there must be a possibility to format strings in a column. On the left side, in the center, on the right side. Do you know something to position Strings in a JTableColumn ?
Wolfgang

How to listen for actionContent button click event in View

Hello,
Doing this:
FlexGlobals.topLevelApplication.addEventListener('actionContentClick',showOptions);
Results in calling showOptions() as many times as the view was showed. The handler sticks and each time I enter a view in the creationComplete hander for it I add the same listener over and over again.
How should this be done?
1. FlexGlobals.topLevelApplication is the right object to listen to?
2. I can remove the listener on view deactivate, but I am not sure if that will be called each time the view goes away.
3. Can I check if an object already has a listener and which is it?
Thank you.

Thank you, Tom.
I was complicating things for myself by exposing methods in the main MXML file to add and remove and listen to click events on a button placed in the actionContent, instead of declaring it in MXML for each and adding a listener to it. Views had different actionContent buttons or rather icons for them.
In regards to hasEvenListener, can I also get the method(s) attached to that? Probably not though.

Way to listen for change in JTable cell?

I am having troubles trying to catch a key event while the user is entering text inside a given JTable cell (x/y location). The JTable only seems to manage String objects in it's cells so I can't place a JTextField in there with a KeyListener on it.
Currently, I can only get control of the application once the user has left the cell they are editing.
Does anyone have an example of a JTable 'cell KeyListener' scenario? At this point I want to see if I can print 'hello world' each time I type a character within a cell. Then I'll go from there....

If you want to know when the contents of a cell have been updated you should use a TableModelListener.
If you want to know when a character is added/removed from the cell editor then you need to first understand how this works with a simple text field.
Typically you would use a DocumentListener to receive notifies of a change to the text field. However, within the DocumentEvent you wouldn't be able to change the text field as this notification comes after the text field has already been updated.
If you need to ability to intercept changes to the text field before they happen, then you would need to use a DocumentFilter. An example of using a DocumentFilter is given in the Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html#filter]Text Component Features.
Once you get your regular text field working the way you want, the next step to create a DefaultCellEditor using this JTextField and use this editor in your JTable. The above tutorial also has a section on using editors in a table.

How to listen for resizing of JTable column

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