JTable and TableModelEvent: tableChanged(TableModelEvent) called twice
Hi,
This question has already been posted (http://forum.java.sun.com/thread.jsp?forum=257&thread=114517) but wasn't answered at that time so i decided to make another attempt.
How comes that tableChanged(TableModelEvent) is executed twice for each change?
I've tried to see if the two events could be differenciated by retrieving their properties using the avalaible methods: getType(), getColumn(), getLastRow() etc... but they both come with the same properties values... no easy way to "filter" them in tableChanged() so...
Is there a way to only have one of them cast for one change?
Maybe JTable or TableModel methods to override or sthg like this...
This is a blocking problem for the application we're writting. so, any hint or workaround greatly welcome :)
This one was short... if u need further informations, just post a request for them as a reply, i'll be glad to add details :)
regards,
Silvin
I actually just solved that very problem with my code, as I was reading your post.
remove the model.addTableModelListener(...) call from your code. This is implicitly handled by JTable when you specify model as the TableModel for your table. Adding it again causes it to receive the events twice.
Hope that helps!
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I have two files excerpts from my Java application. I feel that in order for me to get understood so well, with regards to a problem that challenged me, I had to post these two files as you can see below. They are called ResultSetTableModel.java and DisplayQueryResults.java [which gets displayed in an internal frame].
I have this code from ResultSetTableModel
// ResultSetTableModel.java
// A TableModel that supplies ResultSet data to a JTable.
import java.sql.Connection;
import java.sql.Statement;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import javax.swing.table.AbstractTableModel;
// ResultSet rows and columns are counted from 1 and JTable
// rows and columns are counted from 0. When processing
// ResultSet rows or columns for use in a JTable, it is
// necessary to add 1 to the row or column number to manipulate
// the appropriate ResultSet column (i.e., JTable column 0 is
// ResultSet column 1 and JTable row 0 is ResultSet row 1).
public class ResultSetTableModel extends AbstractTableModel
private Connection connection;
private Statement statement;
private ResultSet resultSet;
private ResultSetMetaData metaData;
private int numberOfRows;
// keep track of database connection status
private boolean connectedToDatabase = false;
// constructor initializes resultSet and obtains its meta data object;
// determines number of rows
public ResultSetTableModel(String driver, String url,
String username, String password, String query)
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// load database driver class
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connection = DriverManager.getConnection(url, username, password);
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// set query and execute it
setQuery(query);
} // end constructor ResultSetTableModel
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// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
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try {
String className = metaData.getColumnClassName(column + 1);
// return Class object that represents className
return Class.forName(className);
} // end try
catch (Exception exception) {
exception.printStackTrace();
} // end catch
//return Object.class; // if problems occur above, assume type Object
return getValueAt(0, column).getClass(); // added January 25, 2008 in stead of the one above
} // end method getColumnClass
// get number of columns in ResultSet
public int getColumnCount() throws IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// determine number of columns
try {
return metaData.getColumnCount();
} // end try
catch (SQLException sqlException) {
sqlException.printStackTrace();
} // end catch
return 0; // if problems occur above, return 0 for number of columns
} // end method getColumnCount
// get name of a particular column in ResultSet
public String getColumnName(int column) throws IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// determine column name
try {
return metaData.getColumnName(column + 1);
} // end try
catch (SQLException sqlException) {
sqlException.printStackTrace();
} // end catch
return ""; // if problems, return empty string for column name
} // end method getColumnName
// return number of rows in ResultSet
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// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
return numberOfRows;
} // end method getRowCount
// obtain value in particular row and column
public Object getValueAt(int row, int column)
throws IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// obtain a value at specified ResultSet row and column
try {
resultSet.absolute(row + 1);
return resultSet.getObject(column + 1);
} // end try
catch ( SQLException sqlException ) {
sqlException.printStackTrace();
} // end catch
return ""; // if problems, return empty string object
} // end method getValueAt
* Don't need to implement this method unless your table's
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//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (column < 2) {
return false;
} else {
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throws SQLException, IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
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// specify query and execute it
resultSet = statement.executeQuery(query);
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metaData = resultSet.getMetaData();
// determine number of rows in ResultSet
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numberOfRows = resultSet.getRow(); // get row number
// notify JTable that model has changed
fireTableStructureChanged();
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public void disconnectFromDatabase() {
if (!connectedToDatabase)
return;
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try {
statement.close();
connection.close();
} // end try
catch (SQLException sqlException) {
sqlException.printStackTrace();
} // end catch
finally { // update database connection status
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} // end class ResultSetTableModelThe DisplayQueryResults code follows:
// DisplayQueryResults.java
// Display the contents of the Authors table in the
// Books database.
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.SQLException;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.JTable;
import javax.swing.JOptionPane;
import javax.swing.JButton;
import javax.swing.Box;
import javax.swing.JInternalFrame;
import java.util.*; // for the Bundle
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;
import javax.swing.event.InternalFrameAdapter;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.*; // step 1
import javax.swing.table.TableModel; // step 1
public class DisplayQueryResults extends JInternalFrame implements TableModelListener { // step 2
// JDBC driver, database URL, username and password
ResourceBundle bundle = ResourceBundle.getBundle("Accounting");
String JDBC_DRIVER = bundle.getString("Driver");
String DATABASE_URL = bundle.getString("URL");
String USERNAME = bundle.getString("User");
String PASSWORD = bundle.getString("Password");
String DEFAULT_QUERY = bundle.getString("Query");
private ResultSetTableModel tableModel;
private JTextArea queryArea;
static final int xOffset = 0, yOffset = 200;
// create ResultSetTableModel and GUI
public DisplayQueryResults() {
super("Sales of the Day",
true, //resizable
true, //closable
true, //maximizable
false);//iconifiable
//...Create the GUI and put it in the window...
//Set the window's location.
setLocation(xOffset, yOffset);
// create ResultSetTableModel and display database table
try {
// create TableModel for results of query SELECT * FROM authors
tableModel = new ResultSetTableModel(JDBC_DRIVER, DATABASE_URL,
USERNAME, PASSWORD, DEFAULT_QUERY);
// set up JTextArea in which user types queries
queryArea = new JTextArea(DEFAULT_QUERY, 1, 100);
queryArea.setWrapStyleWord(true);
queryArea.setLineWrap(true);
JScrollPane scrollPane = new JScrollPane(queryArea,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
// set up JButton for submitting queries
JButton submitButton = new JButton("Submit Query");
// create Box to manage placement of queryArea and
// submitButton in GUI
Box box = Box.createHorizontalBox();
box.add(scrollPane);
box.add(submitButton);
// create JTable delegate for tableModel
final JTable resultTable = new JTable(tableModel);
resultTable.setFillsViewportHeight(true); // Makes the empty space heights white
resultTable.setRowSelectionAllowed(true);
resultTable.getModel().addTableModelListener(this); // step 3
// place GUI components on content pane
add(box, BorderLayout.NORTH);
add(new JScrollPane(resultTable), BorderLayout.CENTER);
// create event listener for submitButton
submitButton.addActionListener(
new ActionListener()
// pass query to table model
public void actionPerformed(ActionEvent event)
// perform a new query
try
tableModel.setQuery(queryArea.getText());
} // end try
catch ( SQLException sqlException)
JOptionPane.showMessageDialog(null,
sqlException.getMessage(), "Database error",
JOptionPane.ERROR_MESSAGE);
// try to recover from invalid user query
// by executing default query
try {
tableModel.setQuery(DEFAULT_QUERY);
queryArea.setText(DEFAULT_QUERY);
} // end try
catch (SQLException sqlException2) {
JOptionPane.showMessageDialog(null,
sqlException2.getMessage(), "Database error",
JOptionPane.ERROR_MESSAGE);
// ensure database connection is closed
tableModel.disconnectFromDatabase();
System.exit(1); // terminate application
} // end inner catch
} // end outer catch
} // end actionPerformed
} // end ActionListener inner class
); // end call to addActionListener
//...Then set the window size or call pack...
setSize(750,300);
setVisible(true); // display window
} // end try
catch (ClassNotFoundException classNotFound) {
JOptionPane.showMessageDialog(null,
"MySQL driver not found", "Driver not found",
JOptionPane.ERROR_MESSAGE);
System.exit(1); // terminate application
} // end catch
catch (SQLException sqlException) {
JOptionPane.showMessageDialog(null, sqlException.getMessage(),
"Database error", JOptionPane.ERROR_MESSAGE);
// ensure database connection is closed
tableModel.disconnectFromDatabase();
System.exit(1); // terminate application
} // end catch
// dispose of window when user quits application (this overrides
// the default of HIDE_ON_CLOSE)
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
// ensure database connection is closed when user quits application
addInternalFrameListener(
new InternalFrameAdapter() {
// disconnect from database and exit when window has closed
public void windowClosed(WindowEvent event) {
tableModel.disconnectFromDatabase();
System.exit(0);
} // end method windowClosed
} // end WindowAdapter inner class
); // end call to addWindowListener
} // end DisplayQueryResults constructor
public void tableChanged(TableModelEvent e) { // step 4
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object tableModel = model.getValueAt(row, column);
// Do something with the data...
System.out.println(tableModel);
System.out.println("data");
// execute application
public static void main(String args[]) {
new DisplayQueryResults();
} // end main
} // end class DisplayQueryResultsMy problem:
is in these lines:
public void tableChanged(TableModelEvent e) { // step 4
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object tableModel = model.getValueAt(row, column);
// Do something with the data...
System.out.println(tableModel);
System.out.println("data"); // should output in the console
}How do we notify java that a cell on a row has changed so that we can reflect the changes to the database. The current application shows that the data in cells are editable, but when we edit a cell and hit enter, data changes back to the previous data in that particular cell. And the data as well does not change its state: for example, if a data in the table has a value of boolean value false [checkbox unchecked], I can not modify the checkbox state to checked state. The tableChanged method does not get executed, and therefore, this is a serious error that I cant figure out.
My question:
What code should I write so that I will be able to notify java of the changed cell and how do we write the code that will reflect the changed values in a cell into the database?
Edited by: Oliverbob on Jan 26, 2008 8:40 PMThis maybe what you're looking for??
http://developer.java.sun.com/developer/Books/swing2/chapter18-09.html -
JTable and Database communication
Hi all,
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I have this code from ResultSetTableModel
// ResultSetTableModel.java
// A TableModel that supplies ResultSet data to a JTable.
import java.sql.Connection;
import java.sql.Statement;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import javax.swing.table.AbstractTableModel;
// ResultSet rows and columns are counted from 1 and JTable
// rows and columns are counted from 0. When processing
// ResultSet rows or columns for use in a JTable, it is
// necessary to add 1 to the row or column number to manipulate
// the appropriate ResultSet column (i.e., JTable column 0 is
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public class ResultSetTableModel extends AbstractTableModel
private Connection connection;
private Statement statement;
private ResultSet resultSet;
private ResultSetMetaData metaData;
private int numberOfRows;
// keep track of database connection status
private boolean connectedToDatabase = false;
// constructor initializes resultSet and obtains its meta data object;
// determines number of rows
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String username, String password, String query)
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// load database driver class
Class.forName(driver);
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// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// determine Java class of column
try {
String className = metaData.getColumnClassName(column + 1);
// return Class object that represents className
return Class.forName(className);
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catch (Exception exception) {
exception.printStackTrace();
} // end catch
//return Object.class; // if problems occur above, assume type Object
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// get number of columns in ResultSet
public int getColumnCount() throws IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// determine number of columns
try {
return metaData.getColumnCount();
} // end try
catch (SQLException sqlException) {
sqlException.printStackTrace();
} // end catch
return 0; // if problems occur above, return 0 for number of columns
} // end method getColumnCount
// get name of a particular column in ResultSet
public String getColumnName(int column) throws IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// determine column name
try {
return metaData.getColumnName(column + 1);
} // end try
catch (SQLException sqlException) {
sqlException.printStackTrace();
} // end catch
return ""; // if problems, return empty string for column name
} // end method getColumnName
// return number of rows in ResultSet
public int getRowCount() throws IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
return numberOfRows;
} // end method getRowCount
// obtain value in particular row and column
public Object getValueAt(int row, int column)
throws IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// obtain a value at specified ResultSet row and column
try {
resultSet.absolute(row + 1);
return resultSet.getObject(column + 1);
} // end try
catch ( SQLException sqlException ) {
sqlException.printStackTrace();
} // end catch
return ""; // if problems, return empty string object
} // end method getValueAt
* Don't need to implement this method unless your table's
* editable.
public boolean isCellEditable(int row, int column) { // Added on January 25, 2008 6:51 A.M.
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (column < 2) {
return false;
} else {
return true;
// set new database query string
public void setQuery(String query)
throws SQLException, IllegalStateException {
// ensure database connection is available
if (!connectedToDatabase)
throw new IllegalStateException("Not Connected to Database");
// specify query and execute it
resultSet = statement.executeQuery(query);
// obtain meta data for ResultSet
metaData = resultSet.getMetaData();
// determine number of rows in ResultSet
resultSet.last(); // move to last row
numberOfRows = resultSet.getRow(); // get row number
// notify JTable that model has changed
fireTableStructureChanged();
} // end method setQuery
// close Statement and Connection
public void disconnectFromDatabase() {
if (!connectedToDatabase)
return;
// close Statement and Connection
try {
statement.close();
connection.close();
} // end try
catch (SQLException sqlException) {
sqlException.printStackTrace();
} // end catch
finally { // update database connection status
connectedToDatabase = false;
} // end finally
} // end method disconnectFromDatabase
} // end class ResultSetTableModelThe DisplayQueryResults code follows:
// DisplayQueryResults.java
// Display the contents of the Authors table in the
// Books database.
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.SQLException;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.JTable;
import javax.swing.JOptionPane;
import javax.swing.JButton;
import javax.swing.Box;
import javax.swing.JInternalFrame;
import java.util.*; // for the Bundle
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;
import javax.swing.event.InternalFrameAdapter;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.*; // step 1
import javax.swing.table.TableModel; // step 1
public class DisplayQueryResults extends JInternalFrame implements TableModelListener { // step 2
// JDBC driver, database URL, username and password
ResourceBundle bundle = ResourceBundle.getBundle("Accounting");
String JDBC_DRIVER = bundle.getString("Driver");
String DATABASE_URL = bundle.getString("URL");
String USERNAME = bundle.getString("User");
String PASSWORD = bundle.getString("Password");
String DEFAULT_QUERY = bundle.getString("Query");
private ResultSetTableModel tableModel;
private JTextArea queryArea;
static final int xOffset = 0, yOffset = 200;
// create ResultSetTableModel and GUI
public DisplayQueryResults() {
super("Sales of the Day",
true, //resizable
true, //closable
true, //maximizable
false);//iconifiable
//...Create the GUI and put it in the window...
//Set the window's location.
setLocation(xOffset, yOffset);
// create ResultSetTableModel and display database table
try {
// create TableModel for results of query SELECT * FROM authors
tableModel = new ResultSetTableModel(JDBC_DRIVER, DATABASE_URL,
USERNAME, PASSWORD, DEFAULT_QUERY);
// set up JTextArea in which user types queries
queryArea = new JTextArea(DEFAULT_QUERY, 1, 100);
queryArea.setWrapStyleWord(true);
queryArea.setLineWrap(true);
JScrollPane scrollPane = new JScrollPane(queryArea,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
// set up JButton for submitting queries
JButton submitButton = new JButton("Submit Query");
// create Box to manage placement of queryArea and
// submitButton in GUI
Box box = Box.createHorizontalBox();
box.add(scrollPane);
box.add(submitButton);
// create JTable delegate for tableModel
final JTable resultTable = new JTable(tableModel);
resultTable.setFillsViewportHeight(true); // Makes the empty space heights white
resultTable.setRowSelectionAllowed(true);
resultTable.getModel().addTableModelListener(this); // step 3
// place GUI components on content pane
add(box, BorderLayout.NORTH);
add(new JScrollPane(resultTable), BorderLayout.CENTER);
// create event listener for submitButton
submitButton.addActionListener(
new ActionListener()
// pass query to table model
public void actionPerformed(ActionEvent event)
// perform a new query
try
tableModel.setQuery(queryArea.getText());
} // end try
catch ( SQLException sqlException)
JOptionPane.showMessageDialog(null,
sqlException.getMessage(), "Database error",
JOptionPane.ERROR_MESSAGE);
// try to recover from invalid user query
// by executing default query
try {
tableModel.setQuery(DEFAULT_QUERY);
queryArea.setText(DEFAULT_QUERY);
} // end try
catch (SQLException sqlException2) {
JOptionPane.showMessageDialog(null,
sqlException2.getMessage(), "Database error",
JOptionPane.ERROR_MESSAGE);
// ensure database connection is closed
tableModel.disconnectFromDatabase();
System.exit(1); // terminate application
} // end inner catch
} // end outer catch
} // end actionPerformed
} // end ActionListener inner class
); // end call to addActionListener
//...Then set the window size or call pack...
setSize(750,300);
setVisible(true); // display window
} // end try
catch (ClassNotFoundException classNotFound) {
JOptionPane.showMessageDialog(null,
"MySQL driver not found", "Driver not found",
JOptionPane.ERROR_MESSAGE);
System.exit(1); // terminate application
} // end catch
catch (SQLException sqlException) {
JOptionPane.showMessageDialog(null, sqlException.getMessage(),
"Database error", JOptionPane.ERROR_MESSAGE);
// ensure database connection is closed
tableModel.disconnectFromDatabase();
System.exit(1); // terminate application
} // end catch
// dispose of window when user quits application (this overrides
// the default of HIDE_ON_CLOSE)
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
// ensure database connection is closed when user quits application
addInternalFrameListener(
new InternalFrameAdapter() {
// disconnect from database and exit when window has closed
public void windowClosed(WindowEvent event) {
tableModel.disconnectFromDatabase();
System.exit(0);
} // end method windowClosed
} // end WindowAdapter inner class
); // end call to addWindowListener
} // end DisplayQueryResults constructor
public void tableChanged(TableModelEvent e) { // step 4
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object tableModel = model.getValueAt(row, column);
// Do something with the data...
System.out.println(tableModel);
System.out.println("data");
// execute application
public static void main(String args[]) {
new DisplayQueryResults();
} // end main
} // end class DisplayQueryResultsMy problem:
is in these lines:
public void tableChanged(TableModelEvent e) { // step 4
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object tableModel = model.getValueAt(row, column);
// Do something with the data...
System.out.println(tableModel);
System.out.println("data"); // should output in the console
}How do we notify java that a cell on a row has changed so that we can reflect the changes to the database. The current application shows that the data in cells are editable, but when we edit a cell and hit enter, data changes back to the previous data in that particular cell. And the data as well does not change its state: for example, if a data in the table has a value of boolean value false [checkbox unchecked], I can not modify the checkbox state to checked state. The tableChanged method does not get executed, and therefore, this is a serious error that I cant figure out.
My question:
What code should I write so that I will be able to notify java of the changed cell and how do we write the code that will reflect the changed values in a cell into the database?
Edited by: Oliverbob on Jan 26, 2008 9:54 PMWhy don't you check out the link shown below:
http://www.aokabc.com
and just follow the white rabbit!
;o)
V.V. -
Edit JTable and Send Info To DB!!!!! Duke$$$$
hi,
I have an Applet that contains JTable.
I am retriveing person information from DB to jTable...
Once i click on the JTable i want to change the value in the JTable cell and click the Update button to update that info in db...
Can someone please guide me on how this can be done...
If possible if someone can post a simple code or post where i can get an example like this...
Again Thanks for any help..
Samtake a look at this code.
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class SimpleTableDemo extends JFrame implements TableModelListener {
private boolean DEBUG = true;
javax.swing.table.TableModel modela;
public SimpleTableDemo() {
super("SimpleTableDemo");
Object[][] data = {
{"Mary", "Campione",
"Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml",
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath",
"Chasing toddlers", new Integer(2), new Boolean(false)},
{"Mark", "Andrews",
"Speed reading", new Integer(20), new Boolean(true)},
{"Angela", "Lih",
"Teaching high school", new Integer(4), new Boolean(false)}
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
final JTable table = new JTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
modela = table.getModel();
modela.addTableModelListener(this);
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this window.
getContentPane().add(scrollPane, BorderLayout.CENTER);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
public void tableChanged(TableModelEvent e){
int row = e.getFirstRow();
int column = e.getColumn();
Object firstname = modela.getValueAt(row, 0);
Object lastname = modela.getValueAt(row, 1);
Object sport = modela.getValueAt(row, 2);
Object years = modela.getValueAt(row, 3);
Object veg = modela.getValueAt(row, 4);
System.out.println();
System.out.println(firstname);
System.out.println(lastname);
System.out.println(sport);
System.out.println(years);
System.out.println(veg);
System.out.println();
public static void main(String[] args) {
SimpleTableDemo frame = new SimpleTableDemo();
frame.pack();
frame.setVisible(true);
hope this helps -
JTable and storing up-dated in a file
The first task is to save data entered in the JTable to a file.
I could not do this as I could not access the updated model.
I include the three files. At the moment the method tableChanged is stopping the init method loading because it sees this a table changed.
Any help after a day slogging at this would be most appreciated.
Yours Sincerely,
Kieran A. Murray
package tables;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.Vector;
import javax.swing.table.*;
public class PowerFrame extends JFrame
private JFrame PowerFrame;
private JTabbedPane PowerTabPane;
private JMenuItem fMenuOpen = null;
private JMenuItem fMenuSave = null;
private JMenuItem fMenuClose = null;
JavaFilter fJavaFilter = new JavaFilter ();
File fFile = new File ("default.dat");
private Object Vectorin;
private Object v;
public Vector q;
private int count;
private int xcount;
private int qcount;
private int ycount;
private int pcount;
private File file;
BusbarRecords Busbar = new BusbarRecords();
BusbarsUI ui = new BusbarsUI();
public PowerFrame () {
super("Begin at the Beginning");
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
PowerTabPane = new JTabbedPane(SwingConstants.RIGHT);
PowerTabPane.setBackground(Color.blue);
PowerTabPane.setForeground(Color.white);
populatePowerTabbedPane();
buildMenu();
getContentPane().add(PowerTabPane);
private void populatePowerTabbedPane()
PowerTabPane.addTab("Busbars", null, new BusbarsUI(), "Data for Busbar");
private void buildMenu()
JMenuBar mb = new JMenuBar();
JMenu menu = new JMenu("File");
setJMenuBar (mb);
setSize (400,400);
JMenuItem openitem = new JMenuItem("Open");
JMenuItem saveitem = new JMenuItem("Save");
JMenuItem exititem = new JMenuItem("Exit");
exititem.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
System.exit(0);
openitem.addActionListener(new ActionListener()
public void actionPerformed ( ActionEvent e ) {
boolean status = false;
status = openFile ();
if (!status)
JOptionPane.showMessageDialog (
null,
"Error opening file!", "File Save Error",
JOptionPane.ERROR_MESSAGE);
saveitem.addActionListener(new ActionListener()
public void actionPerformed ( ActionEvent e ) {
boolean status = false;
status = saveFile ();
if (!status)
JOptionPane.showMessageDialog (
null,
"Error opening file!", "File Open Error",
JOptionPane.ERROR_MESSAGE);
menu.add(openitem);
menu.add(saveitem);
menu.add(exititem);
mb.add(menu);
setJMenuBar(mb);
* Use a JFileChooser in Open mode to select files
* to open. Use a filter for FileFilter subclass to select
* for *.java files. If a file is selected then read the
* file and place the string into the textarea.
boolean openFile () {
JFileChooser fc = new JFileChooser ();
fc.setDialogTitle ("Open File");
// Choose only files, not directories
fc.setFileSelectionMode ( JFileChooser.FILES_ONLY);
// Start in current directory
fc.setCurrentDirectory (new File ("."));
// Set filter for Java source files.
fc.setFileFilter (fJavaFilter);
// Now open chooser
int result = fc.showOpenDialog (this);
if (result == JFileChooser.CANCEL_OPTION) {
return true;
} else if (result == JFileChooser.APPROVE_OPTION) {
fFile = fc.getSelectedFile ();
// Invoke the readFile method in this class
q = (Vector) readFile (fFile);
System.out.println(q.elementAt(1));
/*ui.readFileIntoJTable(q);*/
} else {
return false;
return true;
} // openFile
boolean saveFile () {
File file = null;
JFileChooser fc = new JFileChooser ();
// Start in current directory
fc.setCurrentDirectory (new File ("."));
// Set filter for Java source files.
fc.setFileFilter (fJavaFilter);
// Set to a default name for save.
fc.setSelectedFile (fFile);
// Open chooser dialog
int result = fc.showSaveDialog (this);
if (result == JFileChooser.CANCEL_OPTION) {
return true;
} else if (result == JFileChooser.APPROVE_OPTION) {
fFile = fc.getSelectedFile ();
if (fFile.exists ()) {
int response = JOptionPane.showConfirmDialog (null,
"Overwrite existing file?","Confirm Overwrite",
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.QUESTION_MESSAGE);
if (response == JOptionPane.CANCEL_OPTION) return false;
return ui.getJTableFields(fFile);
else{
return false;
} // saveFile
public Object readFile (File file) {
try{
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);
v = ois.readObject();
fis.close();
catch(Exception e){
System.err.println("Exception:" + e.getMessage());
return (v);
public static void main(String[] args)
PowerFrame PF = new PowerFrame();
PF.pack();
PF.setSize(765,690);
PF.setBackground(Color.white);
PF.setVisible(true);
package tables;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class BusbarsUI extends JPanel implements TableModelListener {
private boolean DEBUG = true;
private int xcount;
private int ycount;
private int pcount;
private int qcount;
private int y;
private TableModel newmodel;
JTable table;
BusbarRecords Busbar=new BusbarRecords();
public BusbarsUI() {
init();
public void init(){
DefaultTableModel model = new DefaultTableModel();
model.addTableModelListener( this );
JTable table = new JTable(model);
setLayout(new BorderLayout());
setBackground(Color.white);
Vector p = Busbar.setJTableFields();
String[] s = initializevector();
System.out.println(p.size());
for (xcount=1; xcount <= Busbar.columnNames.length;xcount++)
model.addColumn(Busbar.columnNames [xcount-1]);
for (qcount=1; qcount <= 5; qcount++)
model.addRow(s);
pcount=1;
while (pcount < (p.size()-1))
for (ycount=1; ycount <= p.size()/5; ycount++)
for (xcount=1; xcount <= Busbar.columnNames.length;xcount++)
model.setValueAt(p.elementAt(pcount-1), ycount-1, xcount-1);
pcount++;
model.addRow(new Object[]{""});
for (pcount=0; pcount <= p.size()-1; pcount++)
System.out.println(p.elementAt(pcount));
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane, BorderLayout.CENTER);
public void tableChanged(TableModelEvent e)
System.out.println(e.getSource());
if (e.getType() == TableModelEvent.UPDATE)
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = table.getModel();
model.getValueAt(row,column);
Vector g = new Vector();
for(int i=0; i < model.getRowCount();i++){
for(int j=0;j < model.getColumnCount();j++){
g.addElement(model.getValueAt(i,j));
private void stopEditing() {
if (table.getCellEditor() != null)
table.getCellEditor().stopCellEditing();
private String[] initializevector()
String[] v = new String[5];
for (int i=0; i<5;i++)
v="";
return v;
/* public JTable update()
for (xcount=1; xcount <= Busbar.columnNames.length;xcount++)
for (qcount=1; qcount <= 5; qcount++)
System.out.println(model.getValueAt(ycount-1, xcount-1));
JTable table = new JTable(model);
return table;
/* public JTable readFileIntoJTable(Object q)*/
public boolean getJTableFields(File file)
Vector g = new Vector();
stopEditing();
/*for(int i=0; i < model.getRowCount();i++){
for(int j=0;j < model.getColumnCount();j++){
g.addElement(model.getValueAt(i,j));
int numRows=model.getRowCount();
int numCols= model.getColumnCount();
System.out.println("Value of data: ");
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + table.getValueAt(i, j));
System.out.println();
System.out.println("--------------------------");*/
try
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream object = new ObjectOutputStream(fos);
object.writeObject(g);
object.flush();
object.close();
catch(Exception ex)
System.out.println("Exception:" + ex);
return false;
return true;
package tables;
import java.io.*;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import java.util.Vector;
public class BusbarRecords implements Serializable
private String firstName, lastName, sport;
private int years;
private boolean vegetarian;
private int xcount;
private int ycount;
private int pcount;
private int y;
private PowerFrame PR;
File file;
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
Object [][] data = {
{"Mary", "Campione",
"Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml",
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath",
"Chasing toddlers", new Integer(2), new Boolean(false)},
{"Mark", "Andrews",
"Speed reading", new Integer(20), new Boolean(true)},
{"Angela", "Lih",
"Teaching high school", new Integer(4), new Boolean(false)}
public Vector setJTableFields(){
Vector p = new Vector();
for (ycount =1; ycount <=5; ycount++)
for(xcount=1; xcount <= columnNames.length; xcount++)
p.add("one");
return p;
package tables;
import javax.swing.*;
import java.io.*;
/** Filter to work with JFileChooser to select java file types. **/
public class JavaFilter extends javax.swing.filechooser.FileFilter
public boolean accept (File f) {
return f.getName ().toLowerCase ().endsWith (".java")
|| f.isDirectory ();
public String getDescription () {
return "Java files (*.java)";
} // class JavaFilterbrilliant thanks Dr Clap thats just what i was looking for - ive been wasting time searching thru thr ROME and Informa API's for a way of doing this before realising that i just need to write the URL's into a file and the read from them !!
-
Hi,
I have a graphic with the axis x and y. With MouseListener, i get the mouse's coordinates. When i do 'clik' draw a point and now i want the point's coordinates in a table (JTable).
I need some ideas for make this.
Thanks for the help.OK, thanks.
The point is that I want to chage a row of my table: X in (1, 1) and Y (1,2).
x and y are the mouse's coordinates in the graphic when i make "click".
Now i have a class "MyClass" and implements TableModelListener and i have wrotten the next listener:
intable.myModel1.addTableModelListener(this);intable: class's object with the table (JTable).
myModel: the table's model.
public void tableChanged(TableModelEvent e)
Double x = new Double(xCursor);
Double y = new Double(yCursor);
int row = e.getFirstRow();
int column = e.getColumn();
intable.myModel1.setValueAt(x.toString(), row, column);
intable.myModel1.setValueAt(y.toString(), row, column+1);
}I have wrotten this to edit the cell but doesnt work :(
In my model setValueAt haves this form:
public void setValueAt(Object value, int row, int col) {
filaDatos[row][col] = value;
fireTableCellUpdated(row, col);
}Some idea?
Thanks and sorry for my english. -
Is this a Bug?: FocusListener called twice
Hey all,
Im having this problem since realease 1.4.2_04.
Folks, try this code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FocusTest {
public static void main(String[] args) {
JFrame frame = new JFrame("Focus test");
final JTextField field1 = new JTextField("Test1");
final JTextField field2 = new JTextField("Test2");
field1.addFocusListener(new FocusAdapter(){
public void focusGained(FocusEvent e){}
public void focusLost(FocusEvent e){
if( !e.isTemporary() ){
System.out.println("ID: " + e.getID());
JOptionPane.showMessageDialog(null, "Focus lost in 1");
field1.requestFocus();
frame.getContentPane().add(field1, BorderLayout.WEST);
frame.getContentPane().add(field2, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setBounds(0,0,200,300);
frame.show();
} The problem is: when TF1 looses its focus, and is validated, then i force the focus to keep on TF1 by calling TF1.requestFocus(), somehow the event focusLsot is called twice for my TF.
If i do not requestFocus() it work but I must force the focus on TF1.
Im going nuts. Does anyonw apear to have this problems?? In old realeses, the same code work perfect. until 1.4.2 beta.
Tks
BrunoHello all!
I found out that somehow JDialog with requestfocus after, fires twice the lostFocus event. I dont know why. I opened a bug report so they can figure it out why is happaning.
Tks folks!
Bruno -
my iphone 5's screen blacks out every now and then. the phone is turned on but the screen is black and i can receive calls. what is wrong with my phone?
I have to believe this has something to do with iOS 7 issues. I have taken my screen blacked out 5s twice to the Genius Bar and the found a bunch of system apps had crashed. So if this is the case, is iOS7 the problem?
-
JTable and ResultSet TableModel with big resultset
Hi, I have a question about JTable and a ResultSet TableModel.
I have to develop a swing JTable application that gets the data from a ResultSetTableModel where the user can update the jtable data.
The problem is the following:
the JTable have to contain the whole data of the source database table. Currently I have defined a
a TYPE_SCROLL_SENSITIVE & CONCUR_UPDATABLE statement.
The problem is that when I execute the query the whole ResultSet is "downloaded" on the client side application (my jtable) and I could receive (with big resultsets) an "out of memory error"...
I have investigate about the possibility of load (in the client side) only a small subset of the resultset but with no luck. In the maling lists I see that the only way to load the resultset incrementally is to define a forward only resultset with autocommit off, and using setFetchSize(...). But this solution doesn't solve my problem because if the user scrolls the entire table, the whole resultset will be downloaded...
In my opinion, there is only one solution:
- create a small JTable "cache structure" and update the structure with "remote calls" to the server ...
in other words I have to define on the server side a "servlet environment" that queries the database, creates the resultset and gives to the jtable only the data subsets that it needs... (alternatively I could define an RMI client/server distribuited applications...)
This is my solution, somebody can help me?
Are there others solutions for my problem?
Thanks in advance,
StefanoThe database table currently is about 80000 rows but the next year will be 200000 and so on ...
I know that excel has this limit but my JTable have to display more data than a simple excel work sheet.
I explain in more detail my solution:
whith a distribuited TableModel the whole tablemodel data are on the server side and not on the client (jtable).
The local JTable TableModel gets the values from a local (limited, 1000rows for example) structure, and when the user scroll up and down the jtable the TableModel updates this structure...
For example: initially the local JTable structure contains the rows from 0 to 1000;
the user scroll down, when the cell 800 (for example) have to be displayed the method:
getValueAt(800,...)
is called.
This method will update the table structure. Now, for example, the table structure will contain data for example from row 500 to row 1500 (the data from 0 to 499 are deleted)
In this way the local table model dimension will be indipendent from the real database table dimension ...
I hope that my solution is more clear now...
under these conditions the only solutions that can work have to implement a local tablemodel with limited dimension...
Another solution without servlet and rmi that I have found is the following:
update the local limited tablemodel structure quering the database server with select .... limit ... offset
but, the select ... limit ... offset is very dangerous when the offset is high because the database server have to do a sequential scan of all previuous records ...
with servlet (or RMI) solution instead, the entire resultset is on the server and I have only to request the data from the current resultset from row N to row N+1000 without no queries...
Thanks
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