Cant update JTable?
When I in my ActionListener try to update mu JTable by fireTableDataChanged() nothing happens? Can anyone help me with this?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.table.*;
import java.text.*;
class Kalender extends JFrame implements ActionListener
Container contentPane = getContentPane();
JScrollPane scrollPane;
JTable table;
MyTableModel myModel;
JButton back = new JButton("<<");
JButton forward = new JButton(">>");
JLabel frem = new JLabel();
Icon fremIcon= new ImageIcon(this.getClass().getResource("frem.gif"));
JLabel tilbage = new JLabel();
Icon tilbageIcon = new ImageIcon(this.getClass().getResource("tilbage.gif"));
Kalender()
contentPane.setLayout(null);
myModel = new MyTableModel();
table = new JTable(myModel);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
DefaultTableCellRenderer tcrColumn = new DefaultTableCellRenderer();
tcrColumn.setHorizontalAlignment(JTextField.CENTER);
table.getColumnModel().getColumn(0).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(1).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(2).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(3).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(4).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(5).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(6).setCellRenderer(tcrColumn);
//table.getColumnModel().getColumn(7).setCellRenderer(tcrColumn);
table.getColumnModel().getColumn(0).setPreferredWidth(80);
table.getColumnModel().getColumn(1).setPreferredWidth(80);
table.getColumnModel().getColumn(2).setPreferredWidth(80);
table.getColumnModel().getColumn(3).setPreferredWidth(80);
table.getColumnModel().getColumn(4).setPreferredWidth(80);
table.getColumnModel().getColumn(5).setPreferredWidth(80);
table.getColumnModel().getColumn(6).setPreferredWidth(80);
//table.getColumnModel().getColumn(7).setPreferredWidth(80);
table.setRowHeight(50);
scrollPane = new JScrollPane(table);
scrollPane.setBounds(20,20,604,330);
getContentPane().add(scrollPane);
back.setBounds(280,400,50,20);
back.addActionListener(this);
contentPane.add(back);
forward.setBounds(340,400,50,20);
forward.addActionListener(this);
contentPane.add(forward);
public void actionPerformed( ActionEvent e )
if(e.getSource()==back)
myModel.maaned--;
myModel.fireTableDataChanged();
System.out.println(myModel.maaned);
if(e.getSource()==forward)
myModel.maaned++;
myModel.fireTableDataChanged();
System.out.println(myModel.maaned);
class MyTableModel extends AbstractTableModel
final String[] columnNames = {//"Uge",
"Mandag",
"Tirsdag",
"Onsdag",
"Torsdag",
"Fredag",
"L�rdag",
"S�ndag"};
final Object[][] data=new Object[6][7];
int aarTaeller=0;
int maanedTaeller=0;
int maaned=0;
MyTableModel()
Calendar calendar = new GregorianCalendar();
int aar = calendar.get(calendar.YEAR+aarTaeller);
maaned = (calendar.get(calendar.MONTH)+maanedTaeller);
Calendar c = new GregorianCalendar(aar,maaned,1);
int dageMaaned = c.getActualMaximum(c.DAY_OF_MONTH);
int dageUge=0;
int dageUge2 = (c.get(c.DAY_OF_WEEK));
int ugeAar = c.get(c.WEEK_OF_YEAR);
SimpleDateFormat sdf = new SimpleDateFormat( "EEEE" );
String dagNavn = sdf.format( c.getTime());
if(dagNavn.equals("mandag")) dageUge=0;
if(dagNavn.equals("tirsdag")) dageUge=1;
if(dagNavn.equals("onsdag")) dageUge=2;
if(dagNavn.equals("torsdag")) dageUge=3;
if(dagNavn.equals("fredag")) dageUge=4;
if(dagNavn.equals("l�rdag")) dageUge=5;
if(dagNavn.equals("s�ndag")) dageUge=6;
System.out.println("maaned "+maaned);
System.out.println("uge dag "+dageUge);
System.out.println("uge dag "+dageUge2);
System.out.println("dage maaned "+dageMaaned);
System.out.println("dag navn "+dagNavn);
int taeller=1;
int taeller2=0;
for(int i=0;i<6;i++)
int ii = 0;
if(taeller2<dageUge)// MANDAG
data[ii] ="";
ii++;
if(taeller==dageMaaned)break;
taeller2++;
else
data[ii] =""+taeller;
ii++;
if(taeller==dageMaaned)break;
taeller++;
taeller2++;
if(taeller2<dageUge)// TIRSDAG
data[ii] ="";
ii++;
if(taeller==dageMaaned)break;
taeller2++;
else
data[ii] =""+taeller;
ii++;
if(taeller==dageMaaned)break;
taeller++;
taeller2++;
if(taeller2<dageUge)// ONSDAG
data[ii] ="";
ii++;
if(taeller==dageMaaned)break;
taeller2++;
else
data[ii] =""+taeller;
ii++;
if(taeller==dageMaaned)break;
taeller++;
taeller2++;
if(taeller2<dageUge)// TORSDAG
data[ii] ="";
ii++;
if(taeller==dageMaaned)break;
taeller2++;
else
data[ii] =""+taeller;
ii++;
if(taeller==dageMaaned)break;
taeller++;
taeller2++;
if(taeller2<dageUge)// FREDAG
data[ii] ="";
ii++;
if(taeller==dageMaaned)break;
taeller2++;
else
data[ii] =""+taeller;
ii++;
if(taeller==dageMaaned)break;
taeller++;
taeller2++;
if(taeller2<dageUge)// L�RDAG
data[ii] ="";
ii++;
if(taeller==dageMaaned)break;
taeller2++;
else
data[ii] =""+taeller;
ii++;
if(taeller==dageMaaned)break;
taeller++;
taeller2++;
if(taeller2<dageUge)// S�NDAG
data[ii] ="";
ii++;
if(taeller==dageMaaned)break;
taeller2++;
else
data[ii] =""+taeller;
ii++;
if(taeller==dageMaaned)break;
taeller++;
taeller2++;
for(int i=0;i<5;i++)
data[0] =""+ugeAar;
ugeAar++;
if(ugeAar==52)
ugeAar=1;
public int getColumnCount()
return columnNames.length;
public int getRowCount()
return data.length;
public String getColumnName(int col)
return columnNames[col];
public Object getValueAt(int row, int col)
return data[row][col];
public boolean isCellEditable(int row, int col)
return true;
public void setValueAt(Object value, int row, int col)
data[row][col] = value;
fireTableCellUpdated(row, col);
fireTableDataChanged();
First of all, since you post a lot of questions please learn how to use the forum correctly:
1) Don't cross post (http://forum.java.sun.com/thread.jsp?forum=31&thread=292582)
2) Use [ code ]...[ /code ] tags around you code so people can actually read the code.
The way I understand it, the fireTableDataChanged() method will invoke the getValueAt() method of your data model for every cell in your table.
Now for your problem. The reason nothing happens is because your data hasn't changed.
When you create MyTableModel the constructor populates your two dimensional 'data' array.
When the actionListener is invoked you change the variable 'maaned', but thats all you do, you don't reset the values of you data array. What you need to do is execute the code in your constructor, which will reset the values in your data array. (ie. the code in your constructor should be moved to a separate method so it can be executed by the constructor and the actionListener.
At least I think thats what the problem is. Hope that makes sense.
Similar Messages
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Hi. this is a follow up from [Original Tread in "New To Java"|http://forums.sun.com/thread.jspa?messageID=10886612�]
Hope you can help me here. For you who dont read the link. This application is build only to lay up here. So the Layout aint pretty. It compiles and run tho. What i want and cant get to work is to reload table when i push my JTabbedPane.
Main Class
package test;
import javax.swing.*;
import javax.swing.event.*;
public class Main {
public Main() {
run();
public void run(){
frame();
// clear and update JTable in class three
public void clearThree() {
Three t = new Three();
t.clearVector();
public JFrame frame() {
JFrame frame = new JFrame();
JTabbedPane tab = new JTabbedPane();
tab.addTab("two",new Two());
tab.addTab("three", new Three());
tab.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
clearThree();// this dont work
frame.add(tab);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800,400);
frame.setVisible(true);
frame.pack();
return frame;
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run(){
new Main();
}// class two
package test;
import java.awt.event.*;
import java.util.Vector;
import javax.swing.*;
// class twoś only purpose is to call clear() in class Three
public class Two extends JPanel{
public Two(){
toolBar();
public void clearThree () {
Three t = new Three();
t.clearVector();
public void toolBar(){
JToolBar bar = new JToolBar();
JButton button = new JButton("clear");
button.addActionListener(new ActionListener (){
public void actionPerformed(ActionEvent e){
clearThree(); // this dont work
bar.add(button);
add(bar);
}// class three hold the table.
package test;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class Three extends JPanel{
DefaultTableModel model;
JTable table;
Vector v = new Vector();
Vector a = new Vector();
Vector<Vector> r = new Vector<Vector>();
public Three() {
jBar();
jTable();
public void clearVector(){
v.removeAllElements();
a.removeAllElements();
r.removeAllElements();
model.fireTableDataChanged();
public void jBar() {
JToolBar bar = new JToolBar();
JButton button = new JButton("clear");
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
clearVector();// this does work
bar.add(button);
add(bar);
public JScrollPane jTable(){
v.addElement("ID");
v.addElement("Name");
a.addElement("01");
a.addElement("Magnus");
r.add(a);
model = new DefaultTableModel(r,v);
table = new JTable(model);
JScrollPane pane = new JScrollPane(table);
add(pane);
return pane;
}Thank you for your replay, I have taken all of your tips and modifed my original application. but the problem is still there. This has been a very messy thread. and it is becouse i thougth it were a table/model problem. But itś not. In the code below I have a JTextField. When i push the JTabbedPanes i want the setText(); to kick in. this compile and run.
// class One
package test;
import javax.swing.*;
import javax.swing.event.*;
public class Main {
public Main() {
run();
public void run(){
frame();
public JFrame frame() {
JTabbedPane tab = new JTabbedPane();
final Three t = new Three();
JFrame frame = new JFrame();
JPanel panel = new JPanel();
tab.addTab("two",new Two());
tab.addTab("three", new Three());
tab.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
t.setText(); // should call setText() in class Three.
frame.add(panel);
frame.add(tab);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(800,400);
frame.setVisible(true);
frame.pack();
return frame;
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run(){
new Main();
}class Two. Does nothing more then holding an empty tab
package test;
import javax.swing.*;
public class Two extends JPanel{
public Two(){
emptyPane();
public void emptyPane () {
JLabel label = new JLabel("Just an empty JTabbedPane");
add(label);
}class Three
package test;
import javax.swing.*;
public class Three extends JPanel{
JTextField text;
public Three() {
text();
public void setText() {
text.setText("Hello"); // this piece of code i want to insert in my JTextField
validate(); // when i push the JTabbedPanes.
repaint();
updateUI();
public JTextField text(){
JToolBar bar = new JToolBar();
text = new JTextField("",20);
bar.add(text);
add(bar);
return text;
} -
hi , i cant update mi ipod touch software, a soon as the download process in finished an error message appears :" session time has expired" something like that
Disabling the computer's security software during the download and update usually resolves a network timeout error.
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i cant update my iphone 3gs to a more newer ios? it says here error! and the phone flashes some connect to itunes.. an if i connct nothing happens.. help me.. the ipgone wont open . and work pls help me thank you!
Hello AlexCornejo,
Thanks for using Apple Support Communities.
The screen you're seeing on your iPhone indicates it is in recovery mode. Now since the device is not appearing in iTunes on your PC, first follow the steps in this article:
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
After following those steps, you should be able to restore your iPhone.
Take care,
Alex H. -
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You've logged into your account and viewed your purchase history and there aren't any error messages shown (e.g. 'problem with a previous purchase'), and you haven't got any purchases due (e.g. pre-orders and/or subscriptions) : Why can’t I select None when I edit my Apple ID payment information ?
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Verify you have a 2G and not a 1G. The 1G does not have volume buttons one the upper left edge and does not have an internal speaker
To update
The Settings>General>Software Update comes with iOS 5 and later.
Connect the iPod to your computer and update via iTunes as far as your iPod model allows
iOS: How to update your iPhone, iPad, or iPod touch
A 1G iPod can go to iOS 2.2 via iTunes and iOS 3.1.3 via
Purchasing iOS 3.1 Software Update for iPod touch (1st generation)
https://buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/touchLegacyLandingPage
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Try:
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Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
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Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
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iOS: How to back up
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Apple Retail Store - Genius Bar -
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- http://support.apple.com/kb/ts1275
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Cant update my ipod error 3194, cant update my ipod error 3194
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I have an ipod and had to change my internet provider. because my previous apple id was part of that providers email I had to change my apple id. Since that time I cant update my ipod because it pops up with the old apple id and password which is no longer valid. How can I get the old apple id/password off the ipod and update my apps
Hey cxl1234,
Thanks for the question. I understand you are experiencing issues after changing your Apple ID. To troubleshoot the issue, lets do the following:
App Store
iOS 6 and later: Go to Settings > iTunes & App Store.
- If you signed out before changing your Apple ID, sign in with your current Apple ID.
- If you're still signed in with your previous Apple ID, tap your previous Apple ID and tap Sign Out. Then enter your current Apple ID to sign in.
via Apple ID: What to do after you change your Apple ID
http://support.apple.com/kb/HT5796
If the above did not resolve your issue, and the applications are available from your purchase history, let’s go ahead and delete them and re-download (this will download the latest version):
Downloading past purchases from the App Store, iBookstore, and iTunes Store
http://support.apple.com/kb/HT2519
Thanks,
Matt M.
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