JMenuBar Update
Hi guys,
I have a question about JMenuBar in Java for Leopard,
I just make a little program with a menu
i used this to put my JMenuBar in the apple MenuBar
*static {*
* System.setProperty("apple.laf.useScreenMenuBar", "true");*
that works fine !
but my menu is like
*File - Profile - New*
actually when you'r not logged in you only get "File" menu !
so i just put a *static int logged = 0;*
for checking
then after login i want add "Profile" and "New"
so i just call back my method
it check the static logged variable
it's equal to 1
so i do
menu.add(profile);
menu.add(neww);
menu.UpdateUI();
and i run my programm but NEVER it add my other menu !
and i don't know why ... it's like never updated
maybe you have an answer ?
or just any help
thanks
apparently ... after my searching day ...
it's a swing problem ... people said to call the function by the event thread but i really don't know how to do it yet
because there aren't examples shown.
Similar Messages
-
Problems getting data from JMenuBar to JInternalFrame
I have modified an example to show my problem. I am trying to take text input from the menu bar and print it into a JTextArea. I don't know how to reference the data in my ActionListener.
The ActionListener is incomplete, but this is basically what I am trying to do:
import javax.swing.JInternalFrame;
import javax.swing.JDesktopPane;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JFrame;
import javax.swing.KeyStroke;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
* InternalFrameDemo.java is a 1.4 application that requires:
* MyInternalFrame.java
public class InternalFrameDemo extends JFrame
implements ActionListener {
JDesktopPane desktop;
JTextField memAddrBox;
JTextArea menuText;
JTextArea frame;
String textFieldString = " Input Text: ";
ActionListener al;
public InternalFrameDemo() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
frame = createFrame(); //create first "window"
setContentPane(desktop);
setJMenuBar(createMenuBar());
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
protected JMenuBar createMenuBar() {
JMenuBar menuBar = new JMenuBar();
JLabel memAddrLabel = new JLabel(textFieldString);
memAddrLabel.setLabelFor(memAddrBox);
menuBar.add(memAddrLabel);
JTextField memAddrBox = new JTextField();
memAddrBox.addActionListener(this);
memAddrBox.setActionCommand("chMemAddr");
menuBar.add(memAddrBox);
return menuBar;
//React to menu selections.
public void actionPerformed(ActionEvent e) {
if ("chMemAddr".equals(e.getActionCommand()))
JMenuBar bar = getJMenuBar();
// JTextField memAddrBox = bar.getParent();
String memStartString = memAddrBox.getText();
update(memStartString);
public void update(String temp)
frame.setText(temp);
//Create a new internal frame.
protected JTextArea createFrame() {
JInternalFrame frame = new JInternalFrame("Memory",true,true,true,true);
frame.setSize(650, 500);
frame.setVisible(true);
frame.setLocation(200, 0);
desktop.add(frame);
JTextArea textArea = new JTextArea();
frame.getContentPane().add("Center", textArea);
textArea.setFont(new Font("SansSerif", Font.PLAIN, 12));
textArea.setVisible(true);
textArea.setText("Initial Text");
return textArea;
//Quit the application.
protected void quit() {
System.exit(0);
public static void main(String[] args) {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
InternalFrameDemo frame = new InternalFrameDemo();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.setVisible(true);
class MyInternalFrame extends JInternalFrame {
static int openFrameCount = 0;
static final int xOffset = 30, yOffset = 30;
public MyInternalFrame() {
super("Document #" + (++openFrameCount),
true, //resizable
true, //closable
true, //maximizable
true);//iconifiable
//...Create the GUI and put it in the window...
//...Then set the window size or call pack...
setSize(300,300);
//Set the window's location.
setLocation(xOffset*openFrameCount, yOffset*openFrameCount);
}I want to take the input from the "memAddrBox" and put it into the "frame" using the update() method. Probably a simple solution, but I have not found a similar problem in the Forums.I knew it had to be something simple, here is the fix I found:
import javax.swing.JInternalFrame;
import javax.swing.JDesktopPane;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JFrame;
import javax.swing.KeyStroke;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
* InternalFrameDemo.java is a 1.4 application that requires:
* MyInternalFrame.java
public class InternalFrameDemo extends JFrame
implements ActionListener {
JDesktopPane desktop;
JTextField memAddrBox;
JTextArea menuText;
JTextArea frame;
String textFieldString = " Input Text: ";
ActionListener al;
public InternalFrameDemo() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
frame = createFrame(); //create first "window"
setContentPane(desktop);
setJMenuBar(createMenuBar());
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
protected JMenuBar createMenuBar() {
JMenuBar menuBar = new JMenuBar();
JLabel memAddrLabel = new JLabel(textFieldString);
memAddrLabel.setLabelFor(memAddrBox);
menuBar.add(memAddrLabel);
JTextField memAddrBox = new JTextField();
memAddrBox.addActionListener(this);
memAddrBox.setActionCommand("chMemAddr");
menuBar.add(memAddrBox);
return menuBar;
//React to menu selections.
public void actionPerformed(ActionEvent e) {
if ("chMemAddr".equals(e.getActionCommand()))
JTextField textField =
(JTextField)e.getSource();
String memStartString = textField.getText();
update(memStartString);
public void update(String temp)
frame.setText(temp);
//Create a new internal frame.
protected JTextArea createFrame() {
JInternalFrame frame = new JInternalFrame("Memory",true,true,true,true);
frame.setSize(650, 500);
frame.setVisible(true);
frame.setLocation(200, 0);
desktop.add(frame);
JTextArea textArea = new JTextArea();
frame.getContentPane().add("Center", textArea);
textArea.setFont(new Font("SansSerif", Font.PLAIN, 12));
textArea.setVisible(true);
textArea.setText("Initial Text");
return textArea;
//Quit the application.
protected void quit() {
System.exit(0);
public static void main(String[] args) {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
InternalFrameDemo frame = new InternalFrameDemo();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.setVisible(true);
class MyInternalFrame extends JInternalFrame {
static int openFrameCount = 0;
static final int xOffset = 30, yOffset = 30;
public MyInternalFrame() {
super("Document #" + (++openFrameCount),
true, //resizable
true, //closable
true, //maximizable
true);//iconifiable
//...Create the GUI and put it in the window...
//...Then set the window size or call pack...
setSize(300,300);
//Set the window's location.
setLocation(xOffset*openFrameCount, yOffset*openFrameCount);
}Note the e.getSource() change in the ActionListener. -
How can I update a JTextArea from another class
I am new to Java so forgive me if this is confusing, or if I seem to be taking an overly complex route to acheiving my goal.
I've got a JTextArea component added to a JPanel object, which is then inserted into the JFrame. I have a JMenuBar with a JMenu "file" and a JMenuItem "connect" on this same JFrame. When clicked, the actionEvent of JMenuItem "connect" calls a class "ConnectToDb" to establish a connection with the Database. On a successful connection, I want to append the String "Connection Successful" to the JTextArea component, but since the component is a part of the JPanel object, I cannot seem to get access to the JTextArea component to update it. I tried instantiating the JPanel object from within the "ConnectToDb" class and then called a method I created to set the JTextArea. No luck. Can someone give me an idea of what I need to do that would allow me to update the text of the JTextArea component from anywhere in my program? Once it has been contained in the JPanel or JFrame, can it be updated?
This is the class that establishes the simple Db Connection
package cjt;
import java.io.*;
import java.sql.*;
* Get a database connection
* Creation date: (04/01/2002 4:08:39 PM)
* @author: Yaffin
public class ConnectToDB {
public Connection dbConnection;
// ConnectToDB constructor
public ConnectToDB() {
public Connection DbConnect() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String sourceURL = new String("jdbc:odbc:CJTSQL");
Connection dbConnection = DriverManager.getConnection(sourceURL, "Encryptedtest", "pass");
System.out.println("Connection Successful\n");
//this is where I originally tried to append "Connection Successful
//to the JTextArea Object in WelcomePane()
} catch (ClassNotFoundException cnfe) {
//user code
System.out.println("This ain't working because of a class not found exeption/n");
} catch (SQLException sqle) {
//user code
System.out.println("SQL Exception caused your DB Connection to SUCK!/n");
return dbConnection;
This is the JPanel that contains the JTextArea "ivjStatusArea" I am trying to update from other classes. Specifically the "ConnectToDb" class above.
package cjt;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
* Build Welcome Pane
* Creation date: (04/01/2002 3:42:50 PM)
* @author: yaffin
public class WelcomePane extends JPanel {
private JTextArea ivjtxtConnect = null;
private JLabel ivjwelcomeLbl = null;
private JTextArea ivjStatusArea = null;
* WelcomePane constructor comment.
public WelcomePane() {
super();
initialize();
* Return the StatusArea property value.
* @return javax.swing.JTextArea
private javax.swing.JTextArea getStatusArea() {
if (ivjStatusArea == null) {
try {
ivjStatusArea = new javax.swing.JTextArea();
ivjStatusArea.setName("StatusArea");
ivjStatusArea.setLineWrap(true);
ivjStatusArea.setWrapStyleWord(true);
ivjStatusArea.setBounds(15, 153, 482, 120);
ivjStatusArea.setEditable(false);
// user code begin {1}
// user code end
} catch (java.lang.Throwable ivjExc) {
// user code begin {2}
// user code end
handleException(ivjExc);
return ivjStatusArea;
* Initialize the class.
private void initialize() {
try {
// user code begin {1}
// user code end
setName("WelcomePane");
setLayout(null);
setSize(514, 323);
add(getStatusArea(), getStatusArea().getName());
} catch (java.lang.Throwable ivjExc) {
handleException(ivjExc);
// user code begin {2}
// user code end
This is the main class where evrything is brought together. Notice the BuildMenu() method where the JMenuItem "connect" is located. Also notice the PopulateTabbedPane() method where WelcomePane() is first instantiated.
* The main application window
* Creation date: (04/01/2002 1:31:20 PM)
* @author: Yaffin
public class CjtApp extends JFrame {
private JTabbedPane tabbedPane;
private ConnectToDB cdb;
private Connection dbconn;
public CjtApp() {
super("CJT Allocation Application");
// Closes from title bar
//and from menu
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
tabbedPane = new JTabbedPane(SwingConstants.TOP);
tabbedPane.setForeground(Color.white);
//add menubar to frame
buildMenu();
//populate and add the tabbed pane
populateTabbedPane(dbconn);
//tabbedPane.setEnabledAt(1, false);
//tabbedPane.setEnabledAt(2, false);
getContentPane().add(tabbedPane);
pack();
* Build menu bar and menus
* Creation date: (04/01/2002 2:42:54 PM)
private void buildMenu() {
// Instantiates JMenuBar, JMenu,
// and JMenuItem.
JMenuBar menubar = new JMenuBar();
JMenu menu = new JMenu("File");
JMenuItem item1 = new JMenuItem("Connect");
JMenuItem item2 = new JMenuItem("Exit");
//Opens database connection screen
item1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//call the ConnectToDb class for a database connection
ConnectToDB cdb = new ConnectToDB();
dbconn = cdb.DbConnect();
}); // Ends buildMenu method
//Closes the application from the Exit
//menu item.
item2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}); // Ends buildMenu method
//Adds the item to the menu object
menu.add(item1);
menu.add(item2);
//Adds the menu object with item
//onto the menu bar
menubar.add(menu);
//Sets the menu bar in the frame
setJMenuBar(menubar);
} //closes buildMenu
public static void main(String[] args) {
CjtApp mainWindow = new CjtApp();
mainWindow.setSize(640, 480);
mainWindow.setBackground(Color.white);
mainWindow.setVisible(true);
mainWindow.setLocation(25, 25);
* Add tabs to the tabbedPane.
* Creation date: (04/01/2002 2:52:19 PM)
private void populateTabbedPane(Connection dbconn) {
Connection dbc = dbconn;
tabbedPane.addTab(
"Welcome",
null,
new WelcomePane(),
"Welcome to CJT Allocation Application");
tabbedPane.addTab(
"Processing",
null,
new ProcessPane(dbc),
"Click here to process an allocation");
tabbedPane.addTab(
"Reporting",
null,
new ReportPane(),
"Click here for reports");
//End
Thanks for any assistance you can provide.
YaffinThanks gmaurice1. I appreciate the response. I believe I understand your explanation. I am clear that the calling code needs access to the WelcomPane() object. I am assuming that the constructor for the calling class must have the JPanel WelcomePane() instance passed to it as an argument. This way I can refer directly to this specific instance of the object. Is this correct?
Also, where would you create the set method? I tried to create a set method as part of the WelcomePane() class, and then call it from the calling class, but it didn't seem to work. Lastly, a globally accessible object? Can you explain this concept briefly? Thanks again for your help.
yaffin -
Update Jcombobox 's label in render
hi ,everybody, i have a problem about combobox, any body can help me!
thank you!
I want to have a combobox with checkbox as item, I rewrite a render writen by ice, because the combobox has three state, when I click diferent checkbox in this combobox , the label of combobox will update rightly, but if I click one checkbox to change the checkbox state ,the label will no update , it seem that when I click one checkbox many times .the menthod
getListCellRendererComponent(JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus)
will no update label
my code :
mainclass:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Iterator;
import java.util.Vector;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.plaf.basic.BasicComboBoxEditor;
public class mainclass {
public static void main(String[] args) {
final testbox myComboBox = new testbox();
myComboBox.addItem("SelectAll");
myComboBox.addItem("ClearAll");
myComboBox.addItem("GrayedAll");
for(int i = 0; i < 5; i++) {
myComboBox.addItem("Item " + i);
JFrame frame = new JFrame("My ComboBox");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setSize(150, 60);
frame.setLocation(300, 300);
//frame.setJMenuBar( menubar );
JPanel panel=new JPanel();
panel.setLayout(new BorderLayout());
panel.add(myComboBox,BorderLayout.NORTH);
frame.getContentPane().add(panel);
frame.setVisible(true);
final IconedCellRendererField renderer = IconedCellRendererField.getCheckBoxRendererInstance();
myComboBox.setRenderer(renderer);
myComboBox.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
if(myComboBox.getSelectedItem().toString().equals("SelectAll")){
renderer.selectAll(true);
if(myComboBox.getSelectedItem().toString().equals("ClearAll")){
renderer.clearAll(true);
if(myComboBox.getSelectedItem().toString().equals("GrayedAll")){
renderer.grayedAll(true);
}renderer:
import java.awt.*;
import java.awt.event.*;
//import java.io.*;
//import java.net.*;
import java.util.*;
import javax.swing.*;
//import javax.swing.event.*;
import javax.swing.border.*;
//import javax.swing.table.*;
public class IconedCellRendererField extends DefaultListCellRenderer implements MouseListener {
public Icon icon, selIcon;
Icon[] icons = null;
public boolean useIconBackground = true, useIndexSensitiveIcons = false,
useCheckBoxAsIcon = false, useLinkState = false;
Dimension labelDim = null;
public JLabel iconLabel;
public JCheckBox box = null;
public JPanel noback;
public SelectionStateHandler selStateHandler = null;
private JList theList = null;
public boolean[] selState = null, enableState = null;
int offset = 5;
Rectangle rect = null;
int currentLinkRow = -1;
boolean isOnRow = false, paintDivider = false;
private Icon dividerImage = null;
private Color linkColor = Color.blue, hoverColor = Color.red, selectedLinkColor = Color.green;
/* Initialises the renderer with one icon that is displayed without the
* cell background.
public IconedCellRendererField(Icon icon) {
this(icon,false);
/* Initialises the renderer with two icons that provide a switch capability
* when a row is selected/deselected
public IconedCellRendererField(Icon icon, Icon selIcon) {
this.icon = icon;
this.selIcon = selIcon;
//addMouseListener(this);
/* Initialises the renderer with two icons that provide a switch capability
* when a row is selected/deselected. The boolean argument enables the icon
* to either use the renderer background or appear transparent.
public IconedCellRendererField(Icon icon, Icon selIcon, boolean useIconBackground) {
this(icon, selIcon);
setIconHasBackground(useIconBackground);
createNoBackgroundPanel();
/* Initialises the renderer with a single no siwthing icon. The boolean
* argument enables the icon to either use the renderer background
* or appear transparent.
public IconedCellRendererField(Icon icon, boolean useIconBackground) {
this(icon, icon, useIconBackground);
/* Initialises the renderer to load two icons from the provided image locations.
* This enables icon switching on selection.
public IconedCellRendererField(String iconLoc, String selIconLoc) {
icon = new ImageIcon(iconLoc);
selIcon = new ImageIcon(selIconLoc);
//addMouseListener(this);
/* Initialises the renderer to load a single icon from the provided image location.
* The icon can either have the renderer background or not based on the
* boolean property.
public IconedCellRendererField(String iconLoc, boolean iconBackground) {
this(iconLoc, iconLoc, iconBackground);
/* Initialises the renderer to load two icons from the provided image locations.
* This enables icon switching on selection. The icon can either have the renderer
* background or not based on the boolean property.
public IconedCellRendererField(String iconLoc, String selIconLoc, boolean iconBackground) {
this(iconLoc, selIconLoc);
setIconHasBackground(iconBackground);
createNoBackgroundPanel();
/* Initialises the renderer to load a single icon from the provided image location.
public IconedCellRendererField(String iconLoc) {
this(iconLoc, true);
/* Initialises the renderer with an array of image icons that are repeated for
* each row in the list.
public IconedCellRendererField(Icon[] icons, boolean useIconBackground) {
this(icons[0], icons[0], useIconBackground);
public void createNoBackgroundPanel() {
iconLabel = new JLabel((Icon)null, JLabel.CENTER);
if(labelDim != null) { iconLabel.setPreferredSize(labelDim); }
iconLabel.setBorder( new EmptyBorder(1,5,1,5) );
noback = new JPanel( new BorderLayout() ) {
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
//public void validate() {}
// public void invalidate() {}
public void repaint() {}
//public void revalidate() {}
public void repaint(long tm, int x, int y, int width, int height) {}
public void repaint(Rectangle r) {}
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
// Strings get interned...
if (propertyName == "text"
|| ((propertyName == "font" || propertyName == "foreground")
&& oldValue != newValue)) {
super.firePropertyChange(propertyName, oldValue, newValue);
public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {}
public void firePropertyChange(String propertyName, char oldValue, char newValue) {}
public void firePropertyChange(String propertyName, short oldValue, short newValue) {}
public void firePropertyChange(String propertyName, int oldValue, int newValue) {}
public void firePropertyChange(String propertyName, long oldValue, long newValue) {}
public void firePropertyChange(String propertyName, float oldValue, float newValue) {}
public void firePropertyChange(String propertyName, double oldValue, double newValue) {}
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
if(useCheckBoxAsIcon()) {
box = new JCheckBox();
//box.addMouseListener(this);
box.setOpaque(false);
noback.add( box, BorderLayout.WEST );
//noback.addMouseListener(this);
rect = box.getBounds();
//list.addMouseListener(this);
} else {
noback.add( iconLabel, BorderLayout.WEST );
noback.add( this, BorderLayout.CENTER );
noback.setBorder( new EmptyBorder(1,1,1,1) );
noback.setOpaque(false);
public Component getListCellRendererComponent(JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus) {
System.out.println(value+"+"+index+"+"+isSelected+"+"+cellHasFocus);
if(theList == null || theList != list) {
theList = list;
if(useLinkState) {
attachLinkSimulationListener();
setOpaque(true);
setText( value == null ? "" : value.toString());
if(useIndexSensitiveIcons) {
icon = getIcon(index);
if(useIconBackground)
setIcon(icon);
setFont( list.getFont() );
setToolTipText(value.toString() );
if(list.isEnabled())
setEnabled( isEnabled(index) );
else
setEnabled( list.isEnabled() );
if(isSelected && isEnabled(index) ) {
setForeground( Color.black );
setBackground( new Color(223, 235, 245) );
if(useIndexSensitiveIcons) {
selIcon = getIcon(index);
if(useIconBackground)
setIcon(selIcon);
} else {
setForeground(Color.black);
setBackground(Color.white);
setBorder(null);
if(cellHasFocus) {
setBorder( new CompoundBorder( new LineBorder( new Color(150, 150, 220) ),
new EmptyBorder(2,2,2,2) ) );
} else {
setBorder( new EmptyBorder(2,2,2,2));
if(useLinkState) {
if(currentLinkRow == index) {
setText("<html><u>" + value.toString()+"</u></html>" );
setForeground( getHoverLinkColor() );
} else {
setForeground( getLinkColor() );
if(isSelected) {
setForeground( getSelectedLinkColor() );
setBackground(Color.white);
setBorder( new EmptyBorder(1,1,1,1) );
if( shdPaintDivider() ) {
Border border = null;
if(dividerImage != null) {
border = new MatteBorder(0,0,1,0, dividerImage);
} else {
border = new MatteBorder(0,0,1,0, getLinkColor() );
if(index < theList.getModel().getSize() - 1 ) {
setBorder( new CompoundBorder(getBorder(),border) );
} else {
setBorder( new EmptyBorder(1,1,1,1) );
if(useIconBackground == false) {
if(isSelected)
iconLabel.setIcon(selIcon);
else
iconLabel.setIcon(icon);
if(useCheckBoxAsIcon()) {
if(selState == null) {
updateSelectionStateTrackers(list);
if(selStateHandler == null) {
list.addMouseListener( selStateHandler = new SelectionStateHandler(list) );
try {
box.setSelected( selState[index] );
} catch(Exception e) {}
if( shdPaintDivider() ) {
//if(index < theList.getModel().getSize() - 1 ) {
noback.setBorder( getBorder() );
setBorder( new EmptyBorder(1,1,1,1) );
//} else {
// noback.get
// this should cause a JComboBox to paint the Label instead of the
// check box + label combination
if(index == -1) {
Vector<Object> v=new Vector<Object>();
v=getSelectedObjects();
String val=generateString();
JLabel label=new JLabel(val);
if(iconLabel.getIcon() != null) {
label.setIcon( iconLabel.getIcon() );
System.out.println("label");
return label;
return noback;
return this;
public String generateString()
String val = "";
if(selState[0]==true&&selState[1]==false&&selState[2]==false){
for(int i = 3; i < theList.getModel().getSize(); i++) {
String curString=theList.getModel().getElementAt(i).toString();
if(val.length()==0){
val=val+curString+"-1";
} else {
val=val+"&"+curString+"-1";
//clear all
if(selState[1]==true&&selState[0]==false&&selState[2]==false ){
for(int i = 3; i < theList.getModel().getSize(); i++) {
String curString=theList.getModel().getElementAt(i).toString();
if(val.length()==0){
val=val+curString+"-0";
} else {
val=val+"&"+curString+"-0";
//grayedall
if(selState[2]==true&&selState[0]==false&&selState[1]==false ){
val="";
if(selState[0]==false&&selState[1]==false&&selState[2]==false ){
for(int i = 3; i < theList.getModel().getSize(); i++) {
String curString=theList.getModel().getElementAt(i).toString();
if(selState==true&&enableState[i]==false){
continue;
if(selState[i]==true&&enableState[i]==true){
if(val.length()==0){
val=val+curString+"-1";
} else {
val=val+"&"+curString+"-1";
if(selState[i]==false&&enableState[i]==true){
if(val.length()==0){
val=val+curString+"-0";
} else {
val=val+"&"+curString+"-0";
return val;
public void updateSelectionStateTrackers(JList list) {
selState = new boolean[ list.getModel().getSize() ];
enableState = new boolean[ list.getModel().getSize() ];
for(int i = 0; i < selState.length; i++) {
selState[i] = false;
enableState[i] = true;
public int[] getSelectedIndices() {
if(!useCheckBoxAsIcon()) {
return new int[0];
int length = 0;
if(selState==null){
return null;
for(int i = 0; i < selState.length; i++) {
if(selState[i]) {
length++;
int[] indices = new int[length];
for(int i = 0, n = 0; i < selState.length; i++) {
if(selState[i]) {
indices[n++] = i;
//System.out.println("Selected Indices.length = " + indices.length);
return indices;
public Vector<Object> getSelectedObjects() {
int[] indices = getSelectedIndices();
Vector<Object> objects = new Vector<Object>();
if(indices==null){
return null;
for(int i = 0; i < indices.length; i++) {
objects.addElement( theList.getModel().getElementAt(indices[i]) );
return objects;
public void setIconHasBackground(boolean b) {
useIconBackground = b;
public Icon[] getIcons() {
return icons;
public Icon getIcon(int index) {
if(icons != null && icons.length == 0) {
return icon;
if(icons != null && index > icons.length) {
index = index - (icons.length - 1);
return icons[index];
public void setIcons(Icon[] icons) {
if(icons != null) {
useIndexSensitiveIcons = true;
this.icons = icons;
public void setIcon(Icon icon, int index) {
if(icons != null && icons.length > 0) {
icons[index] = icon;
public void setIconLabelDimension(Dimension dim) {
labelDim = dim;
public static IconedCellRendererField getCheckBoxRendererInstance() {
IconedCellRendererField cr = new IconedCellRendererField(new EmptyIcon());
cr.setUseCheckBoxAsIcon(true);
return cr;
public void setUseCheckBoxAsIcon(boolean use) {
useCheckBoxAsIcon = use;
createNoBackgroundPanel();
public boolean useCheckBoxAsIcon() {
return useCheckBoxAsIcon;
public void paintComponent(Graphics g) {
super.paintComponent(g);
public void setDisplayItemsAsLinks(boolean use) {
useLinkState = use;
public void setLinkColor(Color color) {
linkColor = color;
if(theList != null) {
theList.repaint();
public Color getLinkColor() {
return linkColor;
public void setHoverLinkColor(Color color) {
hoverColor = color;
if(theList != null) {
theList.repaint();
public Color getHoverLinkColor() {
return hoverColor;
public void setSelectedLinkColor(Color color) {
selectedLinkColor = color;
if(theList != null) {
theList.repaint();
public Color getSelectedLinkColor() {
return selectedLinkColor;
public void attachLinkSimulationListener() {
theList.setCursor( Cursor.getPredefinedCursor(Cursor.HAND_CURSOR) );
theList.addMouseListener( new MouseAdapter() {
public void mouseEntered(MouseEvent e) {
isOnRow = true;
public void mouseExited(MouseEvent e) {
isOnRow = false;
currentLinkRow = -1;
theList.repaint();
theList.addMouseMotionListener( new MouseMotionAdapter() {
public void mouseMoved(MouseEvent e) {
isOnRow = true;
currentLinkRow = theList.locationToIndex( e.getPoint() );
theList.repaint();
/*table.addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent e) {
public void mouseExited(MouseEvent e) {
isOnRow = false;
currentHighlightRow = -1;
table.repaint();
table.addMouseMotionListener( new MouseMotionAdapter() {
public void mouseMoved(MouseEvent e) {
isOnRow = true;
currentHighlightRow = table.rowAtPoint( e.getPoint() );
table.repaint();
public boolean shdPaintDivider() {
return paintDivider;
public void setPaintDivider(boolean paintDivider) {
this.paintDivider = paintDivider;
public void setDividerImage(Icon icon) {
this.dividerImage = icon;
setPaintDivider(true);
private void dispatchEvent(MouseEvent me) {
if(rect != null && box != null && rect.contains(me.getX(), me.getY())){
Point pt = me.getPoint();
pt.translate(0,0);
box.setBounds(rect);
box.dispatchEvent(new MouseEvent(box, me.getID()
, me.getWhen(), me.getModifiers()
, pt.x, pt.y, me.getClickCount()
, me.isPopupTrigger(), me.getButton()));
if(!box.isValid()) {
repaint();
System.out.println("Dispatch Event: Box.invalid called");
System.out.println("Dispatch Event called");
} else {
System.out.println("Dispatch Event Called, rect null");
public void mouseClicked(MouseEvent me){
dispatchEvent(me);
public void mouseEntered(MouseEvent me){
dispatchEvent(me);
public void mouseExited(MouseEvent me){
dispatchEvent(me);
public void mousePressed(MouseEvent me){
dispatchEvent(me);
public void mouseReleased(MouseEvent me){
dispatchEvent(me);
public class SelectionStateHandler extends MouseAdapter {
JList list = null;
public SelectionStateHandler(JList list) {
this.list = list;
public void mouseClicked(MouseEvent e)
* Handles the checkbox selection process. Uses the bounds property of the
* check box within the selected cell to determine whether the checkbox should
* be selected or not
public void mouseReleased(MouseEvent e) {
/*if(list == null || list.getSelectedIndex() == -1
|| !isEnabled( list.locationToIndex(e.getPoint()) ) ) {
return;
if(list == null || list.getSelectedIndex() == -1){
return;
int[] indices = list.getSelectedIndices();
// get the current relative position of the check box
//rect = box.getBounds(rect);
for(int i = 0; i < indices.length; i++) {
// get the current relative position of the check box
int loc = list.locationToIndex( e.getPoint() );
rect = list.getCellBounds(loc,loc);
// ensure the point clicked in within the checkBox
if(e.getX() < (rect.getX() + 20) ) {
Object obj=list.getModel().getElementAt(i);
//if(!obj.equals("SelectAll")&&!obj.equals("ClearAll")&&!obj.equals("GrayedAll")){
if(indices[i]>2){
selState[0]=false;
selState[1]=false;
selState[2]=false;
//����
if(!this.isEnabled(indices[i])&&selState[indices[i]]==true){
this.setEnabled(indices[i],true);
selState[indices[i]]=false;
} else if(this.isEnabled(indices[i])&&selState[indices[i]]==true){
//����
selState[indices[i]]=true;
this.setEnabled(indices[i],false);
}else if(this.isEnabled(indices[i])&&selState[indices[i]]==false){
//����
selState[indices[i]]=true;
this.setEnabled(indices[i],true);
} else {
selState[indices[i]] = !selState[indices[i]];
list.revalidate();
list.repaint();
public void selectAll(boolean b) {
for(int i = 0; i < list.getModel().getSize(); i++) {
try {
this.enableAll(true);
Object obj=list.getModel().getElementAt(i);
if(!obj.equals("ClearAll")&&!obj.equals("GrayedAll")){
selState[i] = b;
} else{
selState[i]=!b;
selState[0]=false;
} catch(ArrayIndexOutOfBoundsException aie) {
updateSelectionStateTrackers(list);
selectAll(b);
return;
if(list != null) {
list.revalidate();
list.repaint();
public void clearAll(boolean b){
for(int i = 0; i < list.getModel().getSize(); i++) {
try {
Object obj=list.getModel().getElementAt(i);
this.enableAll(true);
if(!obj.equals("ClearAll")){
selState[i] = !b;
} else{
selState[i]=b;
selState[1]=false;
} catch(ArrayIndexOutOfBoundsException aie) {
updateSelectionStateTrackers(list);
selectAll(b);
return;
if(list != null) {
list.revalidate();
list.repaint();
public void grayedAll(boolean b){
for(int i = 0; i < list.getModel().getSize(); i++) {
try {
Object obj=list.getModel().getElementAt(i);
if(!obj.equals("SelectAll")&&!obj.equals("ClearAll")){
if(i==2){
selState[i] = !b;
}else{
selState[i] = b;
this.setEnabled(i,false);
} else{
selState[i]=!b;
} catch(ArrayIndexOutOfBoundsException aie) {
updateSelectionStateTrackers(list);
selectAll(b);
return;
if(list != null) {
list.revalidate();
list.repaint();
public void setSelectedIndex(int index) {
for(int i = 0; i < list.getModel().getSize(); i++) {
selState[i] = false;
selectIndex(index);
public void selectIndex(int index) {
try {
selState[index] = true;
} catch(ArrayIndexOutOfBoundsException aie) {
updateSelectionStateTrackers(list);
selectIndex(index);
return;
if(list != null) {
list.revalidate();
list.repaint();
public void setEnabled(int index, boolean b) {
try {
enableState[index] = b;
} catch(ArrayIndexOutOfBoundsException aie) {
updateSelectionStateTrackers(list);
setEnabled(index, b);
public boolean isEnabled(int index) {
if(index == -1) {
return true;
boolean isEnabled = true;
try {
isEnabled = enableState[index];
} catch(ArrayIndexOutOfBoundsException aie) {
updateSelectionStateTrackers(list);
return isEnabled(index);
return isEnabled;
public void enableAll(boolean b) {
for(int i = 0; i < enableState.length; i++) {
enableState[i] = b;
public void selectAll(boolean b) {
if(selStateHandler == null) {
return;
selStateHandler.selectAll(b);
public void clearAll(boolean b){
if(selStateHandler == null) {
return;
selStateHandler.clearAll(b);
public void grayedAll(boolean b){
if(selStateHandler == null) {
return;
selStateHandler.grayedAll(b);
public void setSelectedIndex(int index) {
if(selStateHandler == null) {
return;
selStateHandler.setSelectedIndex(index);
public void selectIndex(int index) {
if(selStateHandler == null) {
return;
selStateHandler.selectIndex(index);
public void enableAll(boolean b) {
if(selStateHandler == null) {
return;
selStateHandler.enableAll(b);
public void setEnabled(int index, boolean enable) {
if(selStateHandler == null) {
return;
selStateHandler.setEnabled(index, enable);
public boolean isEnabled(int index) {
if(selStateHandler == null) {
return true;
return selStateHandler.isEnabled(index);
public boolean isEnabledAll() {
if(enableState == null) return true;
for(int i = 0; i < enableState.length; i++) {
if(!isEnabled(i)) {
return false;
return true;
// EmptyIcon implementation
public static class EmptyIcon implements Icon {
int width = 16, height = 16;
public EmptyIcon() {
setSize(16,16);
public EmptyIcon(int width, int height) {
setSize(width, height);
public void setSize(int width, int height) {
this.width = width;
this.height = height;
public int getIconWidth() { return width; }
public int getIconHeight() { return height; }
public void paintIcon(Component c, Graphics g, int x, int y) {}
public int getItemCount(){
if(theList!=null){
return theList.getModel().getSize();
} else {
return 0;
public boolean[] getEnableState() {
return enableState;
public boolean[] getSelState() {
return selState;
public JList getTheList() {
return theList;
testbox :import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JComboBox;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
public class testbox extends JComboBox
* @param args
JComboBox myComboBox;
public testbox()
myComboBox = new JComboBox();
public void setPopupVisible(boolean b)
if(b)
myComboBox.showPopup();
You are updating the label value when (index == -1), let change into (index<=0).
like below
// this should cause a JComboBox to paint the Label instead of the
           // check box + label combination
           if (index <= 0) {
               Vector v = new Vector();
               v = getSelectedObjects();
               String val = generateString();
               JLabel label = new JLabel(val);
               if (iconLabel.getIcon() != null) {
                   label.setIcon(iconLabel.getIcon());
               System.out.println("label");
               return label;
           } -
I am trying to create a simple JMenuBar in the application enlosed below.
I keep getting the following error when ever i compile
"Screen.java": Error #: 300 : method setJMenuBar(javax.swing.JMenuBar) not found in class random.Screen at line 67, column 9". Can some one please enlighten me.
Class Screen is the main class. This is where the GUI is set up. it calls class Canvas which in turn calls class Nodes. GUI draws a bus network which holds a minimum of two nodes and a maximum of 10. The node number is under user control. The aim is to allow a user to select the configure menu to update the number of nodes on display in the GUI.
package random;
import javax.swing.JPanel;
import javax.swing.border.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;
* <p>Title: Simulation of the random load balancing algorithm </p
public class Screen extends JPanel {
static int screenWidth = (int)(Toolkit.getDefaultToolkit().getScreenSize().width*0.85);
static int screenHeight = (int)(Toolkit.getDefaultToolkit().getScreenSize().height*0.95);
private Container container;
JButton add;
Canvas canvas;
JMenuBar menubar;
JMenu configure;
Thread animatorThread;
RandomApplet RApplet;
public Screen(RandomApplet RApplet){
this.RApplet = RApplet;
makeGui();
public Screen(){
makeGui();
public void makeGui(){
addMenu();
GridBagLayout gridbag = new GridBagLayout();
setLayout(gridbag);
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(1,1,1,1);
//add drawing canvas
canvas = new Canvas();
c.gridx = 0;
c.gridy = 0;
c.weightx=1.0;
c.weighty=1.0;
c.fill=GridBagConstraints.BOTH;
gridbag.setConstraints(canvas, c);
add(canvas);
c.gridx=0;
c.gridy=1;
gridbag.setConstraints(canvas,c);
add(add=addButton("Add"));
private void addMenu(){
menubar = new JMenuBar();
setJMenuBar(menubar);
configure = new JMenu("Configure");
configure.add(new JMenuItem("add"));
menubar.add(configure);
private JButton addButton(String name) {
JButton b = new JButton(name);
ButtonHandler handler=new ButtonHandler();
b.addActionListener(handler);
b.setFont(new Font("Dialog", Font.BOLD, 12));
b.setMargin(new Insets(0,0,0,0));
return b;
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
if (e.getSource()== add){
if (canvas.addNode()){
repaint();
public void run(){
Thread thisThread = Thread.currentThread();
while (animatorThread == thisThread){
try {
Thread.sleep(100);}
catch (Exception e){
break;}
public static void main(String[] args) {
JFrame f=new JFrame("Random");
f.setSize(screenWidth, screenHeight);
f.getContentPane().add(new Screen());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
//class Canvas
package random;
import javax.swing.JPanel;
import java.awt.*;
import java.util.*;
import java.awt.Graphics;
import java.awt.image.*;
import javax.swing.*;
public class Canvas extends JPanel{
int width, height;
Dimension size;
Image canvasImage = null;
Graphics canvasGraphics;
Image networkMem;
int NodeWidth, NodeHeight;
Nodes[] n;
int numberOfNodes;
int x1, y1,x2,y2;
public Canvas(){
// canvas a perfect square
height = 400;
width = 400;
size=new Dimension(width,height);
setBackground(Color.white);
networkMem=Toolkit.getDefaultToolkit().createImage("images/computer6.gif");
NodeWidth = networkMem.getWidth(this);
NodeHeight = networkMem.getHeight(this);
//network must hold a minimum of 2 nodes
n = new Nodes[11];
n[0] = new Nodes(0,this);
n[1] = new Nodes(1,this);
numberOfNodes = 2;
public void paintComponent(Graphics g)
super.paintComponent(g);
//create canvas image
if (canvasImage==null){
canvasImage=createImage(getSize().width,getSize().height);
canvasGraphics = canvasImage.getGraphics();
//adjust above to fit canvas window
if ((canvasImage.getWidth(this) != getSize().width) || (canvasImage.getHeight(this) != getSize().height)){
canvasImage = createImage(getSize().width,getSize().height);
if (canvasImage!=null){
canvasGraphics.dispose();
canvasGraphics = canvasImage.getGraphics();
//create a rectangular border outlining canvas area
canvasGraphics.drawRect(0,0,getSize().width-1,getSize().height-1);
x1=width-100;
y1=height-100;
x2=width-300;
y2=width-100;
canvasGraphics.drawLine(x1,y1,x2,y2);
//canvasGraphics.drawLine(width-300,height-100,width-300,height-50);
//canvasGraphics.drawLine(width-100,height-100,width-100,height-50);
for(int i=0; i<numberOfNodes; i++){
n.drawNode(canvasGraphics);
g.drawImage(canvasImage, 0, 0, this);
super.paintComponent(canvasGraphics);
public int getNumberOfNodes()
return numberOfNodes;
public boolean addNode(){
//add a node to network
if (numberOfNodes < 10) {
n[numberOfNodes]= new Nodes(numberOfNodes, this);
numberOfNodes++;
repaint();
return true;
return false;
public boolean removeNode(){
boolean removed = false;
if (numberOfNodes >2) {
numberOfNodes=numberOfNodes - 1;
removed = true;
else{
removed = false;
repaint();
return removed;
//class Nodes
package random;
import javax.swing.JPanel;
import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
public class Nodes{
int nodeNumber;
Canvas canvas;
public Nodes(int number, Canvas c) {
//each node has a number id
nodeNumber=number;
canvas=c;
public void drawNode(Graphics g){
if (nodeNumber%2 == 0){
canvas.x1=canvas.x1-10;
System.out.println(""+canvas.x1);
g.drawLine(canvas.x1,canvas.y1,canvas.x1,canvas.y2-50);
g.drawImage(canvas.networkMem,canvas.x1,canvas.y1-80,canvas);
else{
canvas.x1=canvas.x1-30;
System.out.println(""+canvas.x1);
g.drawLine(canvas.x1,canvas.y1,canvas.x1,canvas.y2+50);
g.drawImage(canvas.networkMem,canvas.x1,canvas.y2+50,canvas);Thanks for the reply but i figured it out in the end.
I can make use of the following commands
setMenuBar(MenuBar mb)
getMenuBar()
to set the main frame menubar to that declared in addmenu() .
if I add the following code to main() in the screen class the menu appears
Screen screen = new Screen(null);
f.setJMenuBar(screen.getMenuBar()); -
Hi,
im trying to do a music library that connects to mysql.
My problem is that I dont know how to updatethe table after I have been modifying the database.
Ex.
I want to be able to import information to my database and then I want to see the changes instantly.
At the moment I only see the changes after a restart of the program.
My code:
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Vector;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import java.awt.Dimension;
import functions.*;
public class MusicLibrary extends JFrame implements ActionListener
//DEFENITIONS
JLabel north, south, deepSouth;
JScrollPane scrollPane,scrollPane2;
ImageIcon background,top,bottom;
JTextField searchField;
JButton searchButton;
JTable table;
JMenuBar menuBar;
JMenu file;
JMenuItem importSong,removeSong,close;
Container c;
public MusicLibrary()
//MENU
menuBar = new JMenuBar();
file = new JMenu("File");
file.setMnemonic(KeyEvent.VK_F);
importSong = new JMenuItem("Import Song", KeyEvent.VK_I);
removeSong = new JMenuItem("Remove Song", KeyEvent.VK_R);
close = new JMenuItem("Close",KeyEvent.VK_C);
setJMenuBar(menuBar);
menuBar.add(file);
file.add(importSong);
file.add(removeSong);
file.addSeparator();
file.add(close);
//SOUTH
background = new ImageIcon("background.gif");
south = new JLabel (background);
//NORTH
top = new ImageIcon("top.gif");
north = new JLabel(top);
north.setLayout(new FlowLayout());
north.setBackground(new Color(0,0,0));
searchField = new JTextField(50);
searchButton = new JButton("Search");
north.add(searchField);
north.add(searchButton);
//CONTAINER
c = getContentPane();
c.setLayout(new BorderLayout());
c.add(north, BorderLayout.NORTH);
setSize(800,620);
setVisible(true);
setResizable(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
//DEEP SOUTH
bottom = new ImageIcon("bottom.gif");
deepSouth = new JLabel(bottom);
c.add(deepSouth, BorderLayout.SOUTH);
//LISTENERS
close.addActionListener(this);
//searchField.addActionListener(this);
searchButton.addActionListener(this);
importSong.addActionListener(this);
//DATABASE CONNECTION
try {
// load driver, create connection and statement
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:XXX);
Statement stmt = con.createStatement();
// query database
ResultSet rs = stmt.executeQuery("SELECT * FROM song");
// display result
getTable(rs);
scrollPane = new JScrollPane(table);
c.add(scrollPane, BorderLayout.CENTER);
// close statement and connection
stmt.close();
con.close();
catch (ClassNotFoundException e) {
JOptionPane.showMessageDialog(null, e.toString(),
"ClassNotFoundException", JOptionPane.ERROR_MESSAGE);
System.exit(1);
catch (SQLException e) {
JOptionPane.showMessageDialog(null, e.toString(),
"SQLException", JOptionPane.ERROR_MESSAGE);
System.exit(1);
//addWindowListener(new WindowHandler());
setVisible(true);
public void actionPerformed (ActionEvent e)
if(e.getSource()==close)
System.exit(0);
else if(e.getSource()==searchButton)
String textsearch = searchField.getText();
JOptionPane.showMessageDialog(null,"You searched for " + textsearch);
try {
// load driver, create connection and statement
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:XXX);
Statement stmt = con.createStatement();
// query database
ResultSet rs = stmt.executeQuery("SELECT * FROM song WHERE Song_Name = 'Africa'");
// display result
getTable(rs);
stmt.close();
con.close();
catch (ClassNotFoundException f) {
JOptionPane.showMessageDialog(null, f.toString(),
"ClassNotFoundException", JOptionPane.ERROR_MESSAGE);
System.exit(1);
catch (SQLException f) {
JOptionPane.showMessageDialog(null, f.toString(),
"SQLException", JOptionPane.ERROR_MESSAGE);
System.exit(1);
else if(e.getSource()==importSong)
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:XXX);
EditDatabase.importMp3(con);
//TEST
Statement stmt = con.createStatement();
// query database
ResultSet rs = stmt.executeQuery("SELECT * FROM song");
// display result
getTable(rs);
stmt.close();
con.close();
catch (Exception q){System.out.println("error" + q);}
repaint();
private void getTable(ResultSet rs) throws SQLException
ResultSetMetaData rsmd = rs.getMetaData();
Vector cols = new Vector();
Vector rows = new Vector();
// get column names
for (int i = 1; i <= rsmd.getColumnCount(); i++) {
cols.addElement(rsmd.getColumnName(i));
// get rows
while (rs.next()) {
Vector nextRow = new Vector();
for (int i = 1; i <= rsmd.getColumnCount(); i++) {
nextRow.addElement(rs.getString(i));
rows.addElement(nextRow);
// create table
table = new JTable(rows, cols);
//-WINDOW HANDLER-
private class WindowHandler extends WindowAdapter
public void windowClosing(WindowEvent e)
System.exit(0);
//-MAIN-
public static void main (String[] arg)
new MusicLibrary();
*Functions is a package containing importMp3 and deleteMp3
I really appreciate all the help I can get!Thanks for poiting in the right direction.
I had to rethink the design and I stumbled upon some code of yours camickr, thanks.
Now the code looks like this:
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import functions.*;
public class TableFromDatabase extends JFrame implements ActionListener, TableModelListener
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String url = "jdbc:odbc:mild"; // if using ODBC Data Source name
String userid = "frenkan";
String password = "tfb";
Container c;
JTable table;
JScrollPane scrollPane;
JMenuItem importSong,
removeSong,
close;
Connection connection;
public TableFromDatabase()
Vector columnNames = new Vector();
Vector data = new Vector();
try
// Connect to the Database
Class.forName( driver );
Connection connection = DriverManager.getConnection( url, userid, password );
// Read data from a table
String sql = "Select * from Song";
Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery( sql );
ResultSetMetaData md = rs.getMetaData();
int columns = md.getColumnCount();
// Get column names
for (int i = 1; i <= columns; i++)
columnNames.addElement( md.getColumnName(i) );
// Get row data
while (rs.next())
Vector row = new Vector(columns);
for (int i = 1; i <= columns; i++)
row.addElement( rs.getObject(i) );
data.addElement( row );
rs.close();
stmt.close();
catch(Exception e)
System.out.println( e );
// Create TableModel with databases data
DefaultTableModel model = new DefaultTableModel(data, columnNames);
//model.addTableModelListener(this);
// Create table with model as TableModel
table = new JTable(model)
public Class getColumnClass(int column)
return getValueAt(0, column).getClass();
scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
JPanel buttonPanel = new JPanel();
c = getContentPane();
c.add( buttonPanel, BorderLayout.SOUTH );
//MENU
JMenuBar menuBar = new JMenuBar();
JMenu file = new JMenu("File");
importSong = new JMenuItem("Import Song");
removeSong = new JMenuItem("Remove Song");
close = new JMenuItem("Close");
importSong.addActionListener(this);
removeSong.addActionListener(this);
close.addActionListener(this);
setJMenuBar(menuBar);
menuBar.add(file);
file.add(importSong);
file.add(removeSong);
file.addSeparator();
file.add(close);
public void tableChanged(TableModelEvent e)
public void actionPerformed (ActionEvent e)
if (e.getSource() == close)
System.exit(0);
else if (e.getSource() == importSong)
try
// Connect to the Database
Class.forName( driver );
Connection connection = DriverManager.getConnection( url, userid, password );
EditDatabase.importMp3(connection);
catch (Exception exception)
System.out.println("Fel: " + exception);
public static void main(String[] args)
TableFromDatabase frame = new TableFromDatabase();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
}Basicly the same as your with some few modifications.
What I want to know is how to update the table after I have imported a song to the database thru my importMp3() function? Please respond on a basic level. Any help is much appreciated! -
I can seem to load data into my JList that i create. using the code with no pane make the JList update but when i use it with JPane it won't update. Any ideas?
Here the source code with most of unneeded stuff taken out
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;
import java.util.*;
import java.io.*;
public class JavaTest extends JPanel implements ActionListener {
private LoadLog loadLogs = new LoadLog();
private JList barcodeList;
private DefaultListModel barcodeModel;
private JLabel barcodeLabel;
private JFileChooser LogChoser;
public JavaTest() {
super(new BorderLayout(5, 5));
barcodeLabel = new JLabel("Read Barcodes");
barcodeModel = new DefaultListModel();
barcodeList = new JList(barcodeModel);
barcodeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
JScrollPane barcodeScrollPane = new JScrollPane(barcodeList);
JPanel listPane = new JPanel(new BorderLayout());
listPane.add(barcodeLabel, BorderLayout.NORTH);
listPane.add(barcodeList, BorderLayout.CENTER);
JPanel list_desPane = new JPanel(new BorderLayout(5,5));
list_desPane.add(listPane, BorderLayout.WEST);
add(list_desPane, BorderLayout.EAST);
public JMenuBar createMenuBar() {
JMenuBar menuBar;
JMenu menu;
JMenuItem menuItem;
menuBar = new JMenuBar();
menu = new JMenu("File");
menu.getAccessibleContext().setAccessibleDescription(
"Menu to load log file");
menuBar.add(menu);
menuItem = new JMenuItem("Load Log File", KeyEvent.VK_O);
menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, ActionEvent.CTRL_MASK));
menuItem.addActionListener(this);
menuItem.setActionCommand("load");
menu.add(menuItem);
menuItem = new JMenuItem("Exit",KeyEvent.VK_X);
menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.ALT_MASK));
menuItem.addActionListener(this);
menuItem.setActionCommand("exit");
menu.add(menuItem);
return menuBar;
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("Field report producer");
JavaTest menuBar = new JavaTest();
frame.setJMenuBar(menuBar.createMenuBar());
frame.setDefaultCloseOperation( JFrame.DO_NOTHING_ON_CLOSE);
JComponent newContentPane = new JavaTest();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
int exit = JOptionPane.showConfirmDialog(null, "Do you want to exit?",
"Quite Program?",
JOptionPane.YES_NO_OPTION);
if (exit == JOptionPane.YES_OPTION)
System.exit(0);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
public void actionPerformed(ActionEvent e) {
//Handle open button action.
if ("exit".equals(e.getActionCommand()))
exit();
else if("load".equals(e.getActionCommand())){
LogChoser = new JFileChooser(CurrentDirectory());
LogChoser.setFileFilter(new FileFilter() {
public boolean accept(File f) {
return f.getName().toLowerCase().endsWith(".txt")
|| f.isDirectory();
public String getDescription() {
return "Log files (*.txt)";
int returnVal = LogChoser.showOpenDialog(JavaTest.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = LogChoser.getSelectedFile();
ArrayList BarcodeLog = new ArrayList();
BarcodeLog = loadLogs.LoadLogFile(file.getAbsolutePath());
for (Iterator it = BarcodeLog.iterator(); it.hasNext(); ){
barcodeModel.addElement(it.next());
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
private void exit()
int exit = JOptionPane.showConfirmDialog(null, "Do you want to exit?",
"Quite Program?",
JOptionPane.YES_NO_OPTION);
if (exit == JOptionPane.YES_OPTION)
System.exit(0);
private String CurrentDirectory(){
String directory = "";
File dir1 = new File (".");
try {
directory = dir1.getCanonicalPath();
catch(Exception e) {
e.printStackTrace();
return directory;
import java.io.*;
import java.util.ArrayList;
import javax.swing.*;
public class LoadLog
private ArrayList BarcodeLog;
public LoadLog()
public ArrayList LoadLogFile(String FileName)
BarcodeLog = new ArrayList();
try
FileInputStream fstream = new FileInputStream(FileName);
DataInputStream in = new DataInputStream(fstream);
while (in.available() != 0) {
BarcodeLog.add(in.readLine());
in.close();
catch (FileNotFoundException e)
JOptionPane.showMessageDialog(null, "File not found.", "Error", JOptionPane.ERROR_MESSAGE);
catch (IOException e)
JOptionPane.showMessageDialog(null, "Error Loading File.", "Error", JOptionPane.ERROR_MESSAGE);
return BarcodeLog;
}- if you're goin to add a pane then change this:
 listPane.add(barcodeList, BorderLayout.CENTER);into this:
// JScrollPane must be added here instead of a JList
      listPane.add(barcodeScrollPane, BorderLayout.CENTER); -
How do I update a JTextArea dynamically?
Hello! This is my first post, so be gentle. :-)
I am just getting started in Java and am writing a gui app to take a list of PC's from a JTextArea on the left, and reboot them one at a time. Then on the right, in another JTextArea, output whether the reboot was successful, or couldn't ping it, etc. The trouble is, when I run the program, it steps through each PC in the list just like I want it to. Reboots them just as designed. Appends to the JTextArea just as designed. But it does not update the text area until it makes it through the entire list. If I have 100 PCs in the list, it attempts to reboot them all, then BOOM all the appends to the log text area are applied at once. Is there any way to update the text area as an attempt is made on each PC in the list?
Here's the reboot code.
try
Runtime runtime = Runtime.getRuntime();
// TODO Auto-generated method stub
if (e.getSource() == leave)
System.exit(0);
else if (e.getSource() == reboot)
StringTokenizer tokenizer = new StringTokenizer(pclist.getText() + String.valueOf(CRLF));
//StringTokenizer tokenizer = new StringTokenizer(pclist.getText());
//System.out.println(String.valueOf(CRLF)+ "this");
while(tokenizer.hasMoreTokens())
computers.add(tokenizer.nextToken());
log.setText("");
//System.out.println(computers.size());
for(int i = 0; i < computers.size(); i++)
try
Process checkpulse = runtime.exec("ping " + computers.get(i) + " -n 1");// | find '"Reply"'");
int checkPulseExitVal = checkpulse.waitFor();
//System.out.println(checkPulseExitVal);
if (checkPulseExitVal != 0)
log.append("Unable to Ping " + computers.get(i) + "\r\n");
log.revalidate();
//log.setCaretPosition(i);
else if(checkPulseExitVal == 0)
//System.out.println(computers.size());
Process restart = runtime.exec("shutdown -r -t 0 -m \\\\" + computers.get(i));
int restartExitVal = restart.waitFor();
if (restartExitVal == 0)
log.append(computers.get(i) + " Rebooted\r\n");
log.revalidate();
//log.validate();
//log.setCaretPosition(i);
else
log.append("Sumpin happened and I'm not sure what.\r\n");
log.revalidate();
catch (InterruptedException e1)
// TODO Auto-generated catch block
e1.printStackTrace();
catch (IOException e1)
// TODO Auto-generated catch block
e1.printStackTrace();
{code}Dang...I must be doing something not quite right. I'm going to post a largeish block of code. Can you nudge me in the correct direction please? This code compiles and runs. You can just type in bogus pc names on the left and the right pane won't update until it tries to ping and reboot them all.
package pccontrol;
import java.awt.*;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.event.*;
import com.sun.java.swing.plaf.motif.MotifLookAndFeel;
import com.sun.java.swing.plaf.windows.WindowsLookAndFeel;
import com.sun.org.apache.xml.internal.serialize.LineSeparator;
import java.io.*;
import java.lang.*;
import java.util.*;
import java.lang.Runtime;
public class Control extends JFrame
//private GuiFrame fr = new GuiFrame();
private JFrame fr = new JFrame();
private JLabel putlist = new JLabel();
private JMenuBar topframe = new JMenuBar();
private JButton reboot = new JButton("Reboot 'em!");
private JButton leave = new JButton("Exit");
private JTextArea pclist = new JTextArea(0, 20);
private JTextArea log = new JTextArea();
private JScrollPane scrollPane = new JScrollPane(pclist);
private JScrollPane logScrollPane = new JScrollPane(log);
private JPanel pan = new JPanel();
final ArrayList computers = new ArrayList();
//String[] computers = new String[getRandom(50)];
char CRLF = 13;
private Thread thread;
Runtime runtime = Runtime.getRuntime();
//private Process child;
//private String comp;
//private String command = "shutdown";
public Control() throws HeadlessException
// TODO Auto-generated constructor stub
initialize();
public Control(GraphicsConfiguration arg0)
super(arg0);
// TODO Auto-generated constructor stub
initialize();
public Control(String arg0) throws HeadlessException
super(arg0);
// TODO Auto-generated constructor stub
initialize();
public Control(String arg0, GraphicsConfiguration arg1)
super(arg0, arg1);
// TODO Auto-generated constructor stub
initialize();
* @param args
public static void main(final String[] args)
// TODO Auto-generated method stub
new Control();
public void initialize()
fr.getContentPane();
pan.setLayout(new BorderLayout());
pan.add("North", topframe);
topframe.add(reboot);
topframe.add(leave);
reboot.setToolTipText("Click here to REBOOT them all!");
//pan.add("West",pclist);
pan.add("West", scrollPane);
pan.add("Center", logScrollPane);
putlist.setText(" Paste PC list below ");
topframe.add(putlist, 0,0);
fr.add(pan);
//pclist.setLineWrap(false);
fr.pack();
//Create the FrameEventHandler
FrameEventHandler feh = new FrameEventHandler();
//Register this Frame with feh
addWindowListener(feh);
//Create the button event handler.
ButtonEventHandler beh = new ButtonEventHandler();
reboot.addActionListener(beh);
leave.addActionListener(beh);
try
//Change the look and feel of the UI manager.
UIManager.setLookAndFeel(new WindowsLookAndFeel());
//UIManager.setLookAndFeel(new MotifLookAndFeel());
catch (Exception e)
// TODO Auto-generated catch block
e.printStackTrace();
fr.setTitle("PC Control");
fr.setSize(600, 600);
SwingUtilities.updateComponentTreeUI(fr);
fr.setLocation(150, 150);
fr.setVisible(true);
class ButtonEventHandler implements ActionListener
public void actionPerformed(ActionEvent e)
//Runtime runtime = Runtime.getRuntime();
// TODO Auto-generated method stub
if (e.getSource() == leave)
System.exit(0);
else if (e.getSource() == reboot)
StringTokenizer tokenizer = new StringTokenizer(pclist.getText() + String.valueOf(CRLF));
//StringTokenizer tokenizer = new StringTokenizer(pclist.getText());
//System.out.println(String.valueOf(CRLF)+ "this");
//thread = new Thread (new Runnable()
//public void run()
while(tokenizer.hasMoreTokens())
computers.add(tokenizer.nextToken());
log.setText("");
//System.out.println(computers.size());
final Runnable runner = (new Runnable()
public void run()
for(int i = 0; i < computers.size(); i++)
try
Process checkpulse = runtime.exec("ping " + computers.get(i) + " -n 1");// | find '"Reply"'");
int checkPulseExitVal = checkpulse.waitFor();
//System.out.println(checkPulseExitVal);
if (checkPulseExitVal != 0)
log.append("Unable to Ping " + computers.get(i) + "\r\n");
else //(checkPulseExitVal == 0)
//System.out.println(computers.size());
Process restart = runtime.exec("shutdown -r -t 0 -m \\\\" + computers.get(i));
int restartExitVal = restart.waitFor();
if (restartExitVal == 0)
log.append(computers.get(i) + " Rebooted\r\n");
catch (IOException e)
// TODO Auto-generated catch block
e.printStackTrace();
catch (InterruptedException e)
// TODO Auto-generated catch block
e.printStackTrace();
EventQueue.invokeLater(runner);
class FrameEventHandler extends WindowAdapter
//Everride the method / event that you are interested in.
public void windowClosing (WindowEvent e)
// TODO Auto-generated method stub
//super.windowClosing(e);
e.getWindow().setVisible(false);
e.getWindow().dispose();
System.exit(0);
}{code} -
Problem updating JTree via RMI
I'm programming an Instant Messenger application in Java using RMI extensively. Much like most IM applications, my IM clients display a "buddy list" window upon successful authentication with the server. I have reached a huge stumbling block at this point. My Buddylist JFrame contains a JTree that is used to display the status of the user's buddies (i.e. online, offline). I am able to populate the JTree without any problems BEFORE the JFrame is displayed by using the DefaultTreeModel's insertNodeInto() method. But the problem I'm having is that, once the Buddylist is displayed to the user, I can't successfully update the JTree to reflect changing user status. For example, let's say a user with the screename "qwerty" logs in to the server. Now "qwerty" sees his Buddylist pop up on screen. His Buddylist contains 1 user (for simplicity's sake) with screename "foo". "foo" is currently not logged into the system so "foo" is shown in the Buddylist as a child of node Offline. But right now, let's say that "foo" logs into the system. "qwerty's" Buddylist should be updated to reflect the fact that "foo" just signed in by removing "foo" as a child node of Offline and adding a new node to Online called "foo".
I currently have this functionality implemented as an RMI callback method on the server side. When "foo" logs in, the server calls the method fireBuddyLoggedOnEvent() with "foo" as the argument. Because "qwerty" is already logged in, and both users are each other's buddy, the statement
c.getCallback().buddySignedOn(screenname);
will be executed on the client side. Unfortunately, even though this code is successfully executed remotely, "qwerty's" Buddylist's JTree does not update to show that "foo" is now online. My only suspicion is that this is due to the fact that the Buddylist is already visible and this somehow affects its ability to be updated (remember that I have no problem populating the tree BEFORE it's visible). However, I've weeded out this possibility by creating a test frame in which its JTree is successfully updated, but in response to an ActionEvent in response to a button click. Of course, this test case was not an RMI application and does not come with the complexities of RMI. Please help me resolve this issue as it's preventing me from proceeding with my project.
~BTW, sorry for the poor code formatting. I added all the code in wordpad and pasted it in here, which stripped the formatting.
* Frame that allows the user to enter information to
* be used to login to the server.
public class LoginFrame extends JFrame {
signonButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
if (!screenameTextField.getText().equals("") &&
!passwordTextField.getPassword().equals("")) {
try {
serverInter = (ServerInter) Naming.lookup(serverName);
String username = screenameTextField.getText();
String password = String.valueOf(passwordTextField.getPassword());
int connectionID = serverInter.connect(username, password);
System.out.println("authenticate successful");
dispose();
Buddylist buddyList = new Buddylist(username, connectionID);
// Registers the buddylist with the server so that
// the server can remotely call methods on the
// Buddylist.
serverInter.registerCallback(buddyList, connectionID);
return;
} catch (Exception e1) {
JOptionPane.showMessageDialog(LoginFrame.this, e1.getMessage(),
"Connection Error", JOptionPane.ERROR_MESSAGE);
passwordTextField.setText("");
signonButton.setEnabled(false);
e1.printStackTrace();
public static void main(String[] args) {
new LoginFrame();
public class Buddylist extends JFrame implements BuddylistInter {
public Buddylist(String username, int connectionID) {
try {
serverInter = (ServerInter) Naming.lookup(serverName);
this.username = username;
this.connectionID = connectionID;
this.setTitle(username + "'s BuddyList");
initialize();
} catch (Exception e) {
e.printStackTrace();
* Method of interest. Note that this method uses a DynamicTree
* object as included in the Sun tutorial on JTree's
* (located at http://www.iam.ubc.ca/guides/javatut99/uiswing/components/tree.html#dynamic).
* Don't worry too much about where the node is getting added
* but rather, that i wish to verify that an arbitrary node
* can successfully be inserted into the tree during this
* remote method call
public void buddySignedOn(String screenname) throws RemoteException {
// should add screename at some location in the tree
// but doesn't!
treePanel.addObject(screename);
* Oversimplified interface for the Buddylist that is intended
* to be used to allow callbacks to the clientside.
public interface BuddylistInter extends Remote {
public void buddySignedOn(String screenname) throws RemoteException;
* Another oversimplified interface that is to be
* implemented by the server so that the client can
* call remote server methods.
public interface ServerInter extends java.rmi.Remote {
// "Registers" the given Buddylist with this server to allow
// remote callbacks on the Buddylist.
public void registerCallback(Buddylist buddylist, int connectionID)
throws RemoteException;
public class Server extends UnicastRemoteObject implements ServerInter {
private Vector loggedInUsers = new Vector();
// Note that this method assumes that a Connection object
// representing the Buddylist with connectionID was added
// to the loggedInUsers list during authentication.
public void registerCallback(Buddylist buddylist, int connectionID) throws RemoteException {
int index = loggedInUsers.indexOf(new Connection(connectionID));
Connection c = (Connection) loggedInUsers.get(index);
c.setCallback(buddylist);
// Method that's called whenever a client successfully
// connects to this server object.
// screename is the name of the user that successfully
// logged in.
private void fireBuddyLoggedOnEvent(String screenname) {
// Examines each logged in client to determine whether
// or not that client should be notified of screename's
// newly logged in status.
for (int i = 0; i < loggedInUsers.size(); i++) {
Connection c = (Connection) loggedInUsers.get(i);
if (database1.areBuddies(screenname, c.getUsername())) {
try {
// getCallback() returns a reference to
// the Buddylist that was registered
// with this server. At this point,
// the server attempts to notify the
// client that one of his "buddies" has
// just logged into the server.
c.getCallback().buddySignedOn(screenname);
} catch (RemoteException e) {
e.printStackTrace();
}Ok, I deleted all .class files, recomplied, and rmic'd, and I still get the IllegalArgumentException. So I've decided to just post all the code here because I don't want to make an assumption that all the code is correct. Thanks for helping me out with this very stressful problem.
* Created on Nov 13, 2006
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultMutableTreeNode;
public class Buddylist extends JFrame implements BuddylistInter {
private String serverName = "//Broom:" + "5001" + "/IMServer";
private DynamicTree treePanel = null;
private String onlineString = "Online";
private String offlineString = "Offline";
private DefaultMutableTreeNode onlineNode = null;
private DefaultMutableTreeNode offlineNode = null;
private ImageUpdater imageUpdater = null;
private javax.swing.JPanel jContentPane = null;
private ServerInter serverInter = null;
private String username = null;
// A connectionID of -1 indicates that this Buddylist
// has not yet received a valid id from the server.
private int connectionID = -1;
private JMenuBar jJMenuBar = null;
private JMenu jMenu = null;
private JMenu jMenu1 = null;
private JMenu jMenu2 = null;
private JPanel imagePanel = null;
private JSeparator jSeparator1 = null;
public Buddylist(String username, int connectionID) {
try {
serverInter = (ServerInter) Naming.lookup(serverName);
this.username = username;
this.connectionID = connectionID;
this.setTitle(username + "'s BuddyList");
imageUpdater = new ImageChooser(this);
initialize();
* This statement is causing an IllegalArgumentException
* to be thrown! I've tried inserting it at the beginning
* of the constructor and that doesn't help.
UnicastRemoteObject.exportObject(this);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (RemoteException e) {
e.printStackTrace();
} catch (NotBoundException e) {
e.printStackTrace();
* This method initializes this
* @return void
private void initialize() {
this.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
this.setJMenuBar(getJJMenuBar());
this.setPreferredSize(new java.awt.Dimension(196,466));
this.setMinimumSize(new java.awt.Dimension(150,439));
this.setSize(196, 466);
this.setContentPane(getJContentPane());
this.setLocationRelativeTo(null);
this.setVisible(true);
* This method initializes jContentPane
* @return javax.swing.JPanel
private javax.swing.JPanel getJContentPane() {
if(jContentPane == null) {
jContentPane = new javax.swing.JPanel();
jContentPane.setLayout(null);
jContentPane.add(getImagePanel(), null);
jContentPane.add(getJSeparator1(), null);
jContentPane.add(getTreePanel(), null);
return jContentPane;
private DynamicTree getTreePanel() {
if (treePanel == null) {
treePanel = new DynamicTree();
onlineNode = treePanel.addObject(null, onlineString);
offlineNode = treePanel.addObject(null, offlineString);
treePanel.setBounds(6, 138, 177, 196);
populateTree();
return treePanel;
return null;
private void populateTree() {
try {
String [] buddies = serverInter.getBuddyList(this.username);
for (int i = 0; i < buddies.length; i++) {
try {
if (serverInter.isBuddyOnline(buddies)) {
treePanel.addObject(onlineNode, buddies[i]);
else {
treePanel.addObject(offlineNode, buddies[i]);
} catch (RemoteException e1) {
e1.printStackTrace();
} catch (RemoteException e) {
e.printStackTrace();
* This method initializes jJMenuBar
* @return javax.swing.JMenuBar
private JMenuBar getJJMenuBar() {
if (jJMenuBar == null) {
jJMenuBar = new JMenuBar();
jJMenuBar.add(getJMenu());
jJMenuBar.add(getJMenu1());
jJMenuBar.add(getJMenu2());
return jJMenuBar;
* This method initializes jMenu
* @return javax.swing.JMenu
private JMenu getJMenu() {
if (jMenu == null) {
jMenu = new JMenu();
jMenu.setText("My IM");
return jMenu;
* This method initializes jMenu1
* @return javax.swing.JMenu
private JMenu getJMenu1() {
if (jMenu1 == null) {
jMenu1 = new JMenu();
jMenu1.setText("People");
return jMenu1;
* This method initializes jMenu2
* @return javax.swing.JMenu
private JMenu getJMenu2() {
if (jMenu2 == null) {
jMenu2 = new JMenu();
jMenu2.setText("Help");
return jMenu2;
* This method initializes imagePanel
* @return javax.swing.JPanel
private JPanel getImagePanel() {
if (imagePanel == null) {
imagePanel = new JPanel();
imagePanel.setBounds(6, 2, 176, 125);
try {
BufferedImage bi =
ImageIO.read(
getClass().getClassLoader().getResourceAsStream("images/cute_dog.jpg"));
Image scaled = bi.getScaledInstance(
imagePanel.getWidth(), imagePanel.getHeight(), BufferedImage.SCALE_FAST);
final JLabel imageLabel = new JLabel(new ImageIcon(scaled));
imageLabel.setToolTipText("Double click to change image");
imagePanel.add(imageLabel, imageLabel.getName());
imageLabel.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent e) {
if (e.getClickCount() == 2) {
Image selected = imageUpdater.getSelectedImage();
if (selected != null) {
BufferedImage bi = (BufferedImage) selected;
Image scaled = bi.getScaledInstance(
imageLabel.getWidth(), imageLabel.getHeight(), BufferedImage.SCALE_DEFAULT);
imageLabel.setIcon(new ImageIcon(scaled));
} catch (IOException e) {
e.printStackTrace();
return imagePanel;
* This method initializes jSeparator1
* @return javax.swing.JSeparator
private JSeparator getJSeparator1() {
if (jSeparator1 == null) {
jSeparator1 = new JSeparator();
jSeparator1.setBounds(6, 132, 176, 1);
return jSeparator1;
public void buddySignedOn(String screenname) throws RemoteException {
final String temp = screenname;
Runnable addBuddy = new Runnable() {
public void run() {
treePanel.addObject(onlineNode, temp);
SwingUtilities.invokeLater(addBuddy);
public void buddySignedOff(String screenname) throws RemoteException {
// TODO Auto-generated method stub
public boolean equals(Object o) {
Buddylist buddylist = (Buddylist) o;
return connectionID == buddylist.connectionID;
public int hashCode() {
return connectionID;
} // @jve:decl-index=0:visual-constraint="10,11"
* Created on Nov 4, 2006
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface BuddylistInter extends Remote {
public void buddySignedOn(String screenname) throws RemoteException;
public void buddySignedOff(String screenname) throws RemoteException;
* Created on Oct 14, 2006
* Models a single endpoint of a connection between machines.
* @author Josh Feldman
public class Connection {
private String username;
private final int connectionID;
private Buddylist callback = null;
public Connection(String username, int connectionID) {
this.username = username;
this.connectionID = connectionID;
public Connection(int connectionID) {
this.connectionID = connectionID;
public String getUsername() {
return username;
public int getConnectionID() {
return connectionID;
public void setCallback(Buddylist buddylist) {
this.callback = buddylist;
public Buddylist getCallback() {
return callback;
public boolean equals(Object o) {
Connection otherConnection = (Connection) o;
if (otherConnection.getConnectionID() == this.connectionID) {
return true;
else {
return false;
public int hashCode() {
return connectionID;
* Created on Nov 4, 2006
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.Properties;
public class Database implements Serializable{
private final String regex = ";";
private Properties db = null;
private String dbPath = "buddies.txt";
public Database() throws IOException {
db = new Properties();
File buddiesFile = new File(dbPath);
if (!buddiesFile.canRead()) {
throw new IOException("Can't read database!");
try {
FileInputStream fis = new FileInputStream(buddiesFile);
db.load(fis);
System.out.println("database loaded from file");
} catch (IOException e) {
e.printStackTrace();
System.err.println("Can't load the database! Exiting program...");
System.exit(0);
* called when a user adds/deletes a user from the buddylist
public void changeBuddyList() {
//TODO
public boolean doesUserExist(String username) {
System.out.println(db.getProperty(username));
return db.getProperty(username) != null;
public String getPassword(String username) {
String temp = db.getProperty(username);
String [] split = temp.split(regex);
if (split.length == 2)
return split[0];
else {
return null;
public String getBuddies(String username) {
String temp = db.getProperty(username);
if (temp == null)
return null;
String [] split = temp.split(regex);
if (split.length != 2)
return null;
else {
return split[1];
* Determines whether screename1 is a buddy of screename2
* @return
public boolean areBuddies(String screename1, String screename2) {
String [] buddies = getUserBuddies(screename2);
if (buddies == null) {
return false;
else {
for (int i = 0; i < buddies.length; i++) {
if (buddies.equals(screename1)) {
return true;
return false;
public String [] getUserBuddies(String username) {
System.out.println("in db getUserBuddies: username = " + username);
String temp = db.getProperty(username);
if (temp == null)
return null;
String [] split = temp.split(regex);
if (split.length != 2)
return null;
else {
return split[1].split(",");
import java.awt.GridLayout;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
// Note that this is not my code but rather code taken
// from java Sun tutorial
public class DynamicTree extends JPanel {
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
protected JTree tree;
public DynamicTree() {
rootNode = new DefaultMutableTreeNode("Root Node");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setRootVisible(false);
tree.setEditable(false);
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(false);
JScrollPane scrollPane = new JScrollPane(tree);
setLayout(new GridLayout(1,0));
add(scrollPane);
/** Remove all nodes except the root node. */
public void clear() {
rootNode.removeAllChildren();
treeModel.reload();
/** Remove the currently selected node. */
public void removeCurrentNode() {
TreePath currentSelection = tree.getSelectionPath();
if (currentSelection != null) {
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode)
(currentSelection.getLastPathComponent());
MutableTreeNode parent = (MutableTreeNode)(currentNode.getParent());
if (parent != null) {
treeModel.removeNodeFromParent(currentNode);
return;
public void removeObject(DefaultMutableTreeNode child) {
treeModel.removeNodeFromParent(child);
// treeModel.reload();
/** Add child to the currently selected node. */
public DefaultMutableTreeNode addObject(Object child) {
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = tree.getSelectionPath();
if (parentPath == null) {
parentNode = rootNode;
} else {
parentNode = (DefaultMutableTreeNode)
(parentPath.getLastPathComponent());
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child) {
return addObject(parent, child, false);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child,
boolean shouldBeVisible) {
DefaultMutableTreeNode childNode =
new DefaultMutableTreeNode(child);
if (parent == null) {
parent = rootNode;
treeModel.insertNodeInto(childNode, parent,
parent.getChildCount());
// Make sure the user can see the lovely new node.
if (shouldBeVisible) {
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
class MyTreeModelListener implements TreeModelListener {
public void treeNodesChanged(TreeModelEvent e) {
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
* If the event lists children, then the changed
* node is the child of the node we've already
* gotten. Otherwise, the changed node and the
* specified node are the same.
try {
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
} catch (NullPointerException exc) {}
System.out.println("The user has finished editing the node.");
System.out.println("New value: " + node.getUserObject());
public void treeNodesInserted(TreeModelEvent e) {
public void treeNodesRemoved(TreeModelEvent e) {
public void treeStructureChanged(TreeModelEvent e) {
public DefaultTreeModel getModel() {
return treeModel;
* Created on Sep 24, 2006
import java.awt.Frame;
import java.awt.Image;
import javax.swing.JComponent;
* Generic Dialog for allowing a user to browse
* his filesystem for an image file. Dialog
* displays a preview of the image (if it is in fact
* displayable).
* @author Josh Feldman
public class ImageChooser extends JComponent implements ImageUpdater{
private Frame parent = null;
public ImageChooser(Frame parent) {
super();
this.parent = parent;
public Image getSelectedImage() {
ImageChooserDialog dialog = new ImageChooserDialog(parent);
if (dialog.showDialog() == ImageChooserDialog.OK_OPTION) {
return dialog.getSelectedImage();
return null;
} // @jve:decl-index=0:visual-constraint="10,10"
* Created on Sep 24, 2006
import java.awt.Frame;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JDialog;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
* Class that displays a dialog that allows a user
* to browse his/her filesystem for an image file
* for selection.
* @author Josh Feldman
public class ImageChooserDialog extends JDialog {
private Frame parent = null;
private JFileChooser fileChooser = new JFileChooser();
private int option;
public final static int OK_OPTION = 1;
public final static int CANCEL_OPTION = 2;
private Image selectedImage = null;
private javax.swing.JPanel jContentPane = null;
private JPanel previewPanel = null;
private JLabel jLabel = null;
private JTextField filenameTextField = null;
private JButton browseButton = null;
private JButton cancelButton = null;
private JButton okButton = null;
private JLabel previewLabel = null;
* This is the default constructor
public ImageChooserDialog(Frame parent) {
super();
this.parent = parent;
this.setTitle("Select Image");
initialize();
public ImageChooserDialog(Frame parent, String title) {
super();
this.parent = parent;
this.setTitle(title);
initialize();
* This method initializes this
* @return void
private void initialize() {
this.setModal(true);
this.setSize(377, 246);
this.setContentPane(getJContentPane());
this.setVisible(false);
this.setLocationRelativeTo(parent);
this.addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent e) {
selectedImage = null;
option = CANCEL_OPTION;
* This method initializes jContentPane
* @return javax.swing.JPanel
private javax.swing.JPanel getJContentPane() {
if(jContentPane == null) {
jLabel = new JLabel();
jContentPane = new javax.swing.JPanel();
jContentPane.setLayout(null);
jLabel.setBounds(87, 192, 58, 10);
jLabel.setText("Preview");
jContentPane.add(getPreviewPanel(), null);
jContentPane.add(jLabel, null);
jContentPane.add(getFilenameTextField(), null);
jContentPane.add(getBrowseButton(), null);
jContentPane.add(getCancelButton(), null);
jContentPane.add(getOkButton(), null);
return jContentPane;
* This method initializes previewPanel
* @return javax.swing.JPanel
private JPanel getPreviewPanel() {
if (previewPanel == null) {
previewPanel = new JPanel();
previewLabel = new JLabel();
previewPanel.setLayout(null);
previewPanel.setLocation(25, 62);
previewPanel.setSize(172, 125);
previewPanel.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.LOWERED));
previewLabel.setText("");
previewLabel.setLocation(2, 2);
previewLabel.setSize(172, 125);
previewPanel.add(previewLabel, null);
return previewPanel;
* This method initializes jTextField
* @return javax.swing.JTextField
private JTextField getFilenameTextField() {
if (filenameTextField == null) {
filenameTextField = new JTextField();
filenameTextField.setBounds(26, 17, 212, 23);
filenameTextField.setEditable(false);
return filenameTextField;
* This method initializes jButton
* @return javax.swing.JButton
private JButton getBrowseButton() {
if (browseButton == null) {
browseButton = new JButton();
browseButton.setBounds(254, 18, 102, 21);
browseButton.setText("Browse");
browseButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ImageFilter imageFilter = new ImageFilter();
fileChooser.setFileFilter(imageFilter);
int value = fileChooser.showOpenDialog(ImageChooserDialog.this);
if (value == JFileChooser.APPROVE_OPTION) {
File selected = fileChooser.getSelectedFile();
if (selected.canRead()) {
try {
BufferedImage bi = ImageIO.read(selected);
selectedImage = bi;
Image scaled = bi.getScaledInstance(
previewPanel.getWidth(), previewPanel.getHeight(), BufferedImage.SCALE_FAST);
ImageIcon imageIcon = new ImageIcon(scaled);
previewLabel.setIcon(imageIcon);
filenameTextField.setText(selected.getAbsolutePath());
} catch (IOException e1) {
previewLabel.setText("Preview unavailable...");
selectedImage = null;
e1.printStackTrace();
return browseButton;
* This method initializes jButton1
* @return javax.swing.JButton
private JButton getCancelButton() {
if (cancelButton == null) {
cancelButton = new JButton();
cancelButton.setBounds(254, 122, 100, 24);
cancelButton.setText("Cancel");
cancelButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
selectedImage = null;
option = CANCEL_OPTION;
ImageChooserDialog.this.dispose();
return cancelButton;
* This method initializes jButton2
* @return javax.swing.JButton
private JButton getOkButton() {
if (okButton == null) {
okButton = new JButton();
okButton.setBounds(256, 159, 97, 24);
okButton.setText("OK");
okButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
option = OK_OPTION;
ImageChooserDialog.this.dispose();
return okButton;
* Displays this chooser dialog.
* @return - The user selected option
* (i.e. OK_OPTION, CANCEL_OPTION)
public int showDialog() {
this.setVisible(true);
return option;
* Returns the image chosen by the user.
* @return
public Image getSelectedImage() {
return selectedImage;
import java.io.File;
import javax.swing.filechooser.FileFilter;
public class ImageFilter extends FileFilter {
//Accept all directories and all gif, jpg, tiff, or png files.
public boolean accept(File f) {
if (f.isDirectory()) {
return true;
String extension = Utils.getExtension(f);
if (extension != null) {
if (extension.equals(Utils.tiff) ||
extension.equals(Utils.tif) ||
extension.equals(Utils.gif) ||
extension.equals(Utils.jpeg) ||
extension.equals(Utils.jpg) ||
extension.equals(Utils.png)) {
return true;
} else {
return false;
return false;
//The description of this filter
public String getDescription() {
return "Just Images";
* Created on Sep 24, 2006
import java.awt.Image;
* Contract that specifies how a class can update
* the view in its graphical display.
* @author Josh Feldman
public interface ImageUpdater {
public Image getSelectedImage();
* Created on Nov 4, 2006
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.rmi.Naming;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class LoginFrame extends JFrame {
private String serverName = "//Broom:5001/IMServer";
private ServerInter serverInter = null;
// The icon to be used when this frame is minimized
private Image icon;
// The main image to be displayed on this frame
private Image robotImage;
private javax.swing.JPanel jContentPane = null;
private JPanel imagePanel = null;
private JLabel screenameLabel = null;
private JTextField screenameTextField = null;
private JPanel jPanel1 = null;
private JLabel passwordLabel = null;
private JPasswordField passwordTextField = null;
private JButton signonButton = null;
private JButton helpButton = null;
* This is the default constructor
public LoginFrame() {
initialize();
* This method initializes this
* @return void
private void initialize() {
this.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
this.setSize(210, 368);
this.setContentPane(getJContentPane());
this.setTitle("Sign On");
try {
this.setIconImage(ImageIO.read(new File("images/robby3.jpg")));
} catch (IOException e) {
e.printStackTrace();
this.setLocationRelativeTo(null);
this.setVisible(true);
* This method initializes jPanel
* @return javax.swing.JPanel
private JPanel getImagePanel() {
if (imagePanel == null) {
imagePanel = new JPanel();
imagePanel.setBounds(7, 7, 190, 159);
imagePanel.setBorder(javax.swing.BorderFactory.createLineBorder(java.awt.Color.gray,0));
try {
BufferedImage bi =
ImageIO.read(
getClass().getClassLoader().getResourceAsStream("images/robby_big.bmp"));
Image scaled = bi.getScaledInstance(190, 169, BufferedImage.SCALE_FAST);
JLabel robotLabel = new JLabel(
new ImageIcon(scaled));
imagePanel.add(robotLabel);
} catch (IOException e) {
e.printStackTrace();
return imagePanel;
* This method initializes jTextField
* @return javax.swing.JTextField
private JTextField getScreenameTextField() {
if (screenameTextField == null) {
screenameTextField = new JTextField();
screenameTextField.setBounds(22, 208, 168, 20);
screenameTextField.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent e) {
if (!isAllowedCharacter(e.getKeyChar())) {
e.consume();
Toolkit.getDefaultToolkit().beep();
public void keyPressed(java.awt.event.KeyEvent e) {
int keycode = e.getKeyCode();
if(keycode == KeyEvent.VK_ENTER && signonButton.isEnabled()) {
signonButton.doClick();
passwordTextField.setText("");
else if (keycode == KeyEvent.VK_ESCAPE) {
dispose();
System.exit(0);
public void keyReleased(java.awt.event.KeyEvent e) {
String screename = screenameTextField.getText();
char [] password = passwordTextField.getPassword();
if (screename.equals("") ||
password.length <= 0) {
signonButton.setEnabled(false);
else if (!screename.equals("") &&
password.length > 0) {
signonButton.setEnabled(true);
clearPasswordArray(password);
return screenameTextField;
* This method initializes jPanel1
* @return javax.swing.JPanel
private JPanel getJPanel1() {
if (jPanel1 == null) {
jPanel1 = new JPanel();
jPanel1.setBounds(8, 173, 188, 1);
jPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(java.awt.Color.gray,5));
return jPanel1;
* This method initializes jPasswordField
* @return javax.swing.JPasswordField
private JPasswordField getPasswordTextField() {
if (passwordTextField == null) {
passwordTextField = new JPasswordField();
passwordTextField.setBounds(20, 259, 170, 20);
passwordTextField.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent e) {
if (!isAllowedCharacter(e.getKeyChar())) {
e.consume();
Toolkit.getDefaultToolkit().beep();
public void keyPressed(java.awt.event.KeyEvent e) {
int keycode = e.getKeyCode();
if(keycode == KeyEvent.VK_ENTER && signonButton.isEnabled()) {
signonButton.doClick();
passwordTextField.setText("");
else if (keycode == KeyEvent.VK_ESCAPE) {
dispose();
System.exit(0);
public void keyReleased(java.awt.event.KeyEvent e) {
String screename = screenameTextField.getText();
char [] password = passwordTextField.getPassword();
if (screename.equals("") ||
password.length <= 0) {
signonButton.setEnabled(false);
else if (!screename.equals("") &&
password.length > 0) {
signonButton.setEnabled(true);
clearPasswordArray(password);
return passwordTextField;
* This method initializes jContentPane
* @return javax.swing.JPanel
private javax.swing.JPanel getJContentPane() {
if(jContentPane == null) {
passwordLabel = new JLabel();
screenameLabel = new JLabel();
jContentPane = new javax.swing.JPanel();
jContentPane.setLayout(null);
screenameLabel.setBounds(22, 182, 132, 20);
screenameLabel.setText("Screename");
screenameLabel.setEnabled(true);
screenameLabel.setFont(new java.awt.Font("Century Gothic", java.awt.Font.BOLD, 12));
passwordLabel.setBounds(21, 238, 135, 17);
passwordLabel.setText("Password");
jContentPane.add(getImagePanel(), null);
jContentPane.add(screenameLabel, null);
jContentPane.add(getScreenameTextField(), null);
jContentPane.add(getJPanel1(), null);
jCon -
Updating a JTable by hiding/displaying columns
I have a customizable JTable where I display/hide columns according to a users' selection criteria. My code works fine for hiding/displaying columns if the Jtable is opened for the fist time, but doesnot work if I want to hide columns in already displayed table.How do I do it?? Any clue?? I tried
myTabModel.fireTableDataChanged();
but this only works for updating the table data...it does not hide columns for me... when I hide column I just remove desired column like this:
myTable.removeColumn(myTable.getColumn("Column 3"));Here is the sample code I tried. It worked without any invalidate or repaint or updateUI(). generated using NetBeans
check for <==== for the line of code doing this
* TableTest.java
* Created on October 9, 2002, 1:42 PM
* @author Anki Reddy Nelaturu
public class TableTest extends javax.swing.JFrame {
/** Creates new form TableTest */
public TableTest() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
jButton1 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();
menuBar = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
openMenuItem = new javax.swing.JMenuItem();
saveMenuItem = new javax.swing.JMenuItem();
saveAsMenuItem = new javax.swing.JMenuItem();
exitMenuItem = new javax.swing.JMenuItem();
editMenu = new javax.swing.JMenu();
cutMenuItem = new javax.swing.JMenuItem();
copyMenuItem = new javax.swing.JMenuItem();
pasteMenuItem = new javax.swing.JMenuItem();
deleteMenuItem = new javax.swing.JMenuItem();
helpMenu = new javax.swing.JMenu();
contentsMenuItem = new javax.swing.JMenuItem();
aboutMenuItem = new javax.swing.JMenuItem();
getContentPane().setLayout(null);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
jScrollPane1.setViewportView(jTable1);
getContentPane().add(jScrollPane1);
jScrollPane1.setBounds(80, 30, 230, 120);
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
getContentPane().add(jButton1);
jButton1.setBounds(170, 180, 81, 26);
jTextField1.setText("jTextField1");
getContentPane().add(jTextField1);
jTextField1.setBounds(60, 190, 63, 20);
fileMenu.setText("File");
openMenuItem.setText("Open");
fileMenu.add(openMenuItem);
saveMenuItem.setText("Save");
fileMenu.add(saveMenuItem);
saveAsMenuItem.setText("Save As ...");
fileMenu.add(saveAsMenuItem);
exitMenuItem.setText("Exit");
exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
exitMenuItemActionPerformed(evt);
fileMenu.add(exitMenuItem);
menuBar.add(fileMenu);
editMenu.setText("Edit");
cutMenuItem.setText("Cut");
editMenu.add(cutMenuItem);
copyMenuItem.setText("Copy");
editMenu.add(copyMenuItem);
pasteMenuItem.setText("Paste");
editMenu.add(pasteMenuItem);
deleteMenuItem.setText("Delete");
editMenu.add(deleteMenuItem);
menuBar.add(editMenu);
helpMenu.setText("Help");
contentsMenuItem.setText("Contents");
helpMenu.add(contentsMenuItem);
aboutMenuItem.setText("About");
helpMenu.add(aboutMenuItem);
menuBar.add(helpMenu);
setJMenuBar(menuBar);
pack();
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
jTable1.removeColumn(jTable1.getColumnModel().getColumn(Integer.parseInt(jTextField1.getText()))); // <========
private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
* @param args the command line arguments
public static void main(String args[]) {
new TableTest().show();
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JMenu fileMenu;
private javax.swing.JMenuItem exitMenuItem;
private javax.swing.JButton jButton1;
private javax.swing.JMenuItem saveAsMenuItem;
private javax.swing.JMenuItem saveMenuItem;
private javax.swing.JMenuItem copyMenuItem;
private javax.swing.JMenuItem pasteMenuItem;
private javax.swing.JMenuItem cutMenuItem;
private javax.swing.JMenuItem openMenuItem;
private javax.swing.JMenuBar menuBar;
private javax.swing.JMenu editMenu;
private javax.swing.JMenuItem aboutMenuItem;
private javax.swing.JMenuItem contentsMenuItem;
private javax.swing.JMenu helpMenu;
private javax.swing.JTextField jTextField1;
private javax.swing.JMenuItem deleteMenuItem;
private javax.swing.JTable jTable1;
// End of variables declaration
} -
JProgressBar Shows Up Too Late--How Do I Update the Display Immediately?
My application has a split pane, the bottom page of which is a panel containing an image that takes a long time to load. For that reason, I want the bottom pane to be a panel with a progress bar until the image is ready.
Here's a simple version of my code:
JPanel progressBarPanel = new JPanel();
JProgressBar progressBar = new JProgressBar(0, 1);
progressBar.setIndeterminate(true);
progressBarPanel.add(progressBar);
splitPane.setBottomComponent(progressBarPanel);Â // line A
splitPane.invalidate();
JPanel imagePanel = createImagePanelSlowly();Â // line B
splitPane.setBottomComponent(imagePanel);
splitPane.invalidate();However, this doesn't work; the display isn't updated until the image is ready. What do I need to put in between lines A and B so that the progress bar shows up before line B starts executing? I've tried validate(), repaint(), using threads and setting the size of the frame to zero and back again, but none of those seem to work. If I pop up a dialog after I add the progress bar to the split pane, the progress bar shows up as soon as the dialog shows up.
This code is inside a ListSelectionListener on a table elsewhere on the GUI, in case that's relevant.
I think I don't understand some basic principle about how to get the GUI to be updated immediately after I make some change.As suggested, I have prepared a compilable demonstration. I figured out that the
problem I was having before was that I was trying to join the background and
event-processing threads (I had been using threads, but I didn't show that code in the
version I posted since it didn't seem to matter). After I eliminated the join, the progress
bar is displayed, but the user can do other things while the image is loading. I want to
prevent the user from doing that. I switched the cursor to a wait cursor, but that doesn't
seem to prevent it.
In particular, while it is loading, the user should be able to:
* resize the window
* minimize the window and bring it back up
* ideally, adjust the split pane, but that isn't critical
but NOT:
* select a different row in the table
* sort the table
* use the menus
Any attempt by the user to perform the disallowed actions should have no effect either
while the image is loading or after it has finished.
(That is, the disallowed events should not simply be queued for later.)
I wonder if there is a simple way to accomplish that.
Here is a demo (3 classes):
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Enumeration;
import java.util.Vector;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
* <p>Copyright (C) 2006
* <p>All rights reserved.
public class DisableGUIDemo extends JFrame {
static final Rectangle SCREEN_SIZE = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds();
static final Color HYACINTH = new Color(160, 96, 192);
static final Color LAVENDER = new Color(224, 208, 232);
Vector<Vector<String>> demoTableData = new Vector<Vector<String>>();
Vector<String> demoColumnNames = new Vector<String>();
protected JTable dataTable;
protected JScrollPane tablePane;
protected JSplitPane mainPane;
protected JPanel imageArea;
private DefaultTableModel dataModel;
* This creates a new <code>DisableGUIDemo</code> instance, builds the UI
* components and displays them.
private DisableGUIDemo(){
super();
setTitle("Demo");
// Ugly: Initialize the table with demo data.
Vector<String> demoTableFirstRow = new Vector<String>();
demoTableFirstRow.add("18");
demoTableFirstRow.add("13");
demoTableFirstRow.add("11");
demoTableFirstRow.add("19");
demoTableFirstRow.add("19");
demoTableData.add(demoTableFirstRow);
Vector<String> demoTableSecondRow = new Vector<String>();
demoTableSecondRow.add("5");
demoTableSecondRow.add("3");
demoTableSecondRow.add("4");
demoTableSecondRow.add("1");
demoTableSecondRow.add("3");
demoTableData.add(demoTableSecondRow);
Vector<String> demoTableThirdRow = new Vector<String>();
demoTableThirdRow.add("11");
demoTableThirdRow.add("12");
demoTableThirdRow.add("10");
demoTableThirdRow.add("18");
demoTableThirdRow.add("18");
demoTableData.add(demoTableThirdRow);
demoColumnNames.add("Column 0");
demoColumnNames.add("Column 1");
demoColumnNames.add("Column 2");
demoColumnNames.add("Column 3");
demoColumnNames.add("Column 4");
dataModel = new DefaultTableModel(demoTableData, demoColumnNames);
initialize();
* The <code>initialize</code> method builds and displays up the GUI.
private void initialize() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
// Build the GUI panels.
setJMenuBar(menuBar());
createSplitPane(true);
setLocation(SCREEN_SIZE.x, SCREEN_SIZE.y);
setSize(SCREEN_SIZE.width, SCREEN_SIZE.height - 20);
setVisible(true);
* This creates and returns the menu bar. The actions to take in response to menu-option selections are
* specified here.
* @return the menu bar
private JMenuBar menuBar(){
JMenuBar menuBar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
fileMenu.setFont(fileMenu.getFont().deriveFont(10.0f));
JMenuItem reset = new JMenuItem("Reset");
reset.setFont(reset.getFont().deriveFont(10.0f));
reset.addActionListener(new ActionListener(){
// When the user resets the display, the configuration panel is recreated.
public void actionPerformed(ActionEvent e){
dataModel = new DefaultTableModel(demoTableData, demoColumnNames);
createSplitPane(true);
int oldWidth = getWidth();
int oldHeight = getHeight();
setSize(0, 0);
setSize(oldWidth, oldHeight);
repaint();
JOptionPane.showMessageDialog(DisableGUIDemo.this,
"The display should be reset.",
"Reset",
JOptionPane.PLAIN_MESSAGE);
fileMenu.add(reset);
fileMenu.addSeparator();
JMenuItem saveTable = new JMenuItem("Save Table");
saveTable.setFont(saveTable.getFont().deriveFont(10.0f));
saveTable.setEnabled(false);
fileMenu.add(saveTable);
menuBar.add(fileMenu);
menuBar.add(Box.createHorizontalGlue());
JMenu helpMenu = new JMenu("Help");
helpMenu.setFont(helpMenu.getFont().deriveFont(10.0f));
JMenuItem help = new JMenuItem("Documentation");
help.setFont(help.getFont().deriveFont(10.0f));
help.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
JOptionPane.showMessageDialog(DisableGUIDemo.this, "There is no documentation available for the demo.");
helpMenu.add(help);
menuBar.add(helpMenu);
return menuBar;
* The <code>createSplitPane</code> method creates the table and image area and displays them in a split pane.
* @param createNewTable whether to create a new table (should be false if the table has already been created)
private void createSplitPane(boolean createNewTable){
if (createNewTable){
dataTable = dataTable();
tablePane = new JScrollPane(dataTable);
Border etchedBorder = new EtchedBorder(EtchedBorder.RAISED, LAVENDER, HYACINTH);
tablePane.setBorder(etchedBorder);
int tablePaneWidth = tablePane.getPreferredSize().width;
int selectedRow = dataTable.getSelectedRow();
imageArea
= (selectedRow == -1)
? new JPanel()
: imageArea((String) dataTable.getValueAt(selectedRow, 0),
(String) dataTable.getValueAt(selectedRow, 2));
imageArea.setMinimumSize(imageArea.getPreferredSize());
mainPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, tablePane, imageArea);
getContentPane().removeAll();
getContentPane().add(mainPane);
* The <code>dataTable</code> method returns the data table.
* @return the data table
private JTable dataTable(){
JTable table = new JTable(dataModel);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = table.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting()){
return; // Ignore extra events.
ListSelectionModel lsm =
(ListSelectionModel) e.getSource();
if (! lsm.isSelectionEmpty()){
final int selectedRow = dataTable.getSelectedRow();
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
JPanel progressBarPanel = new JPanel(); // This should have a border layout.
JProgressBar progressBar = new JProgressBar(0, 1);
progressBar.setIndeterminate(true);
progressBarPanel.add(progressBar);
mainPane.setBottomComponent(progressBarPanel);
mainPane.invalidate();
mainPane.validate();
Thread backgroundThread = new Thread(){
public void run(){
JPanel imageDisplay = imageArea((String) dataTable.getValueAt(selectedRow, 0),
(String) dataTable.getValueAt(selectedRow, 2));
mainPane.setBottomComponent(imageDisplay);
mainPane.invalidate();
setCursor(null);
backgroundThread.start();
// The following code, before being commented out, caused the GUI to be unresponsive while the image was
// being loaded. However, without it, the user can do other things while the image is loading, which is
// not desired.
// try{
// backgroundThread.join();
// catch (InterruptedException ie){
// // N/A
if (dataModel != null){
table.sizeColumnsToFit(-1);
table.getTableHeader().setReorderingAllowed(false);
SpecialHeaderRenderer headerRenderer = new SpecialHeaderRenderer(this);
SpecialCellRenderer bodyCellRenderer = new SpecialCellRenderer();
int i = 0;
for (Enumeration<TableColumn> columns = table.getColumnModel().getColumns(); columns.hasMoreElements(); /** */){
int columnWidth = 0;
TableColumn nextColumn = columns.nextElement();
nextColumn.setHeaderRenderer(headerRenderer);
nextColumn.setCellRenderer(bodyCellRenderer);
nextColumn.sizeWidthToFit();
Component comp = headerRenderer.getTableCellRendererComponent(table, nextColumn.getHeaderValue(),
false, false, 0, 0);
columnWidth = comp.getPreferredSize().width;
for (int j = 0; j < dataModel.getRowCount(); j++){
comp = table.getCellRenderer(j, i).getTableCellRendererComponent(table, dataModel.getValueAt(j, i),
false, false, j, i);
columnWidth = Math.max(comp.getPreferredSize().width, columnWidth);
nextColumn.setPreferredWidth(columnWidth);
nextColumn.setMinWidth(columnWidth);
i++;
return table;
* The <code>imageArea</code> method returns a panel in which an image is shown in the real application.
* In the demo application, it is replaced by a text label; an artificial delay is used to simulate the
* delay that would occur during image loading. The image is loaded when the user selects a row in the table.
* @param parameter1 a parameter to image creation
* @param parameter2 a parameter to image creation
* @return a panel in which a text label stands in for an image
private JPanel imageArea(String parameter1, String parameter2){
try{
Thread.sleep(3000);
catch (InterruptedException ie){
// N/A
JPanel imagePanel = new JPanel();
JLabel substituteLabel = new JLabel("Image for " + parameter1 + ", " + parameter2);
imagePanel.add(substituteLabel);
return imagePanel;
* @param args
public static void main (String[] args) {
UIManager.put("Table.font", new Font("DialogInput", Font.PLAIN, 10));
UIManager.put("Label.font", new Font("Dialog", Font.BOLD, 10));
UIManager.put("TextField.font", new Font("DialogInput", Font.PLAIN, 10));
UIManager.put("ComboBox.font", new Font("Dialog", Font.BOLD, 10));
UIManager.put("Button.font", new Font("Dialog", Font.BOLD, 10));
UIManager.put("List.font", new Font("Dialog", Font.BOLD, 10));
try {
new DisableGUIDemo();
catch (Throwable e) {
e.printStackTrace();
System.exit(0);
} // end of main ()
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Comparator;
import java.util.TreeSet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.table.TableCellRenderer;
* <p>Copyright (C) 2006
* <p>All rights reserved.
public class SpecialHeaderRenderer extends JPanel implements TableCellRenderer {
static final Color MAUVE = new Color(192, 160, 208);
static final Insets ZERO_INSETS = new Insets(0, 0, 0, 0);
static final EmptyBorder EMPTY_BORDER = new EmptyBorder(ZERO_INSETS);
private GridBagConstraints constraints = new GridBagConstraints();
final TreeSet<MouseEvent> processedEvents = new TreeSet<MouseEvent>(new Comparator<MouseEvent>(){
public int compare(MouseEvent o1, MouseEvent o2){
return o1.hashCode() - o2.hashCode();
final private JFrame owner;
public SpecialHeaderRenderer(JFrame ownerWindow) {
setOpaque(true);
setForeground(Color.BLACK);
setBackground(MAUVE);
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
setLayout(new GridBagLayout());
constraints.fill = GridBagConstraints.NONE;
constraints.gridx = 0;
setAlignmentY(Component.CENTER_ALIGNMENT);
owner = ownerWindow;
public Component getTableCellRendererComponent(final JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, final int column){
if (table != null){
removeAll();
String valueString = (value == null) ? "" : value.toString();
JLabel title = new JLabel(valueString);
title.setHorizontalAlignment(SwingConstants.CENTER);
title.setFont(title.getFont().deriveFont(12.0f));
constraints.gridy = 0;
constraints.insets = ZERO_INSETS;
add(title, constraints);
final JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(1, 2));
buttonPanel.setAlignmentX(Component.CENTER_ALIGNMENT);
buttonPanel.setBackground(MAUVE);
final JButton sortAscendingButton = new JButton("V");
sortAscendingButton.setMargin(ZERO_INSETS);
sortAscendingButton.setBorder(EMPTY_BORDER);
constraints.gridy = 1;
constraints.insets = new Insets(5, 0, 0, 0);
buttonPanel.add(sortAscendingButton);
final JButton sortDescendingButton = new JButton("^");
sortDescendingButton.setMargin(ZERO_INSETS);
sortDescendingButton.setBorder(EMPTY_BORDER);
buttonPanel.add(sortDescendingButton);
add(buttonPanel, constraints);
table.getTableHeader().addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e) {
Rectangle panelBounds = table.getTableHeader().getHeaderRect(column);
Rectangle buttonPanelBounds = buttonPanel.getBounds();
Rectangle buttonBounds = sortAscendingButton.getBounds();
buttonBounds.translate(buttonPanelBounds.x, buttonPanelBounds.y);
buttonBounds.translate(panelBounds.x, panelBounds.y);
if (buttonBounds.contains(e.getX(), e.getY()) && processedEvents.add(e)){
// The click was on this button and has not yet been processed.
JOptionPane.showMessageDialog(owner,
"The table would be sorted in ascending order of column " + column + ".",
"Sorted Ascending",
JOptionPane.PLAIN_MESSAGE);
table.invalidate();
table.revalidate();
table.repaint();
buttonBounds = sortDescendingButton.getBounds();
buttonBounds.translate(buttonPanelBounds.x, buttonPanelBounds.y);
buttonBounds.translate(panelBounds.x, panelBounds.y);
if (buttonBounds.contains(e.getX(), e.getY()) && processedEvents.add(e)){
// The click was on this button and has not yet been processed.
JOptionPane.showMessageDialog(owner,
"The table would be sorted in descending order of column " + column + ".",
"Sorted Descending",
JOptionPane.PLAIN_MESSAGE);
table.invalidate();
table.revalidate();
table.repaint();
return this;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.GridLayout;
import java.util.HashMap;
import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
* <code>SpecialCellRenderer</code> is the custom renderer for all
* rows except the header row.
* <p>Copyright (C) 2006
* <p>All rights reserved.
public class SpecialCellRenderer extends JPanel implements TableCellRenderer {
protected Color backgroundColor = Color.PINK; // This means the rows for the first row will be white.
protected HashMap<Object, Color> rowColors = new HashMap<Object, Color>();
public SpecialCellRenderer(){
setOpaque(true);
setForeground(Color.BLACK);
setBackground(Color.WHITE);
setFont(new Font("Monospaced", Font.PLAIN, 10));
setAlignmentX(Component.RIGHT_ALIGNMENT);
setBorder(new EmptyBorder(0, 2, 0, 2));
public Component getTableCellRendererComponent(final JTable table, Object value, boolean isSelected,
boolean hasFocus, final int row, final int column){
String columnName = table.getColumnName(column);
JLabel text = new JLabel();
text.setOpaque(true);
if (table != null){
DefaultTableModel model = (DefaultTableModel) table.getModel();
if (model == null){
System.out.println("The model is null!!");
System.exit(1);
if (table.isCellSelected(row, column)){
setBorder(BorderFactory.createMatteBorder((column < 2) ? 0 : 1,
(column == 2) ? 1 : 0,
(column < 2) ? 0 : 1,
(column == table.getColumnCount() - 1) ? 1 : 0,
Color.BLUE));
else{
setBorder(BorderFactory.createEmptyBorder());
final String rowIdentifier = (String) model.getValueAt(row, 0);
if (! rowColors.containsKey(rowIdentifier)){
rowColors.put(rowIdentifier, nextBackgroundColor());
text.setBackground(rowColors.get(rowIdentifier));
text.setFont(getFont().deriveFont(Font.PLAIN));
String valueString = (value == null) ? "" : value.toString();
text.setText(valueString);
try{
Double.parseDouble(valueString);
text.setHorizontalAlignment(SwingConstants.TRAILING);
catch (NumberFormatException nfe){
text.setHorizontalAlignment(SwingConstants.LEADING);
setLayout(new GridLayout(1, 1));
removeAll();
add(text);
setBackground(text.getBackground());
if (table.getRowHeight() < getMinimumSize().height){
table.setRowHeight(getMinimumSize().height);
return this;
protected Color nextBackgroundColor(){
backgroundColor = backgroundColor.equals(Color.WHITE) ? Color.PINK : Color.WHITE;
return backgroundColor;
} -
My requirement is, client has to sent string messages and server has to receive these messages and display it in jtextarea. In my code sending and receiving are done properly, but the problem is the jtextarea is not updated, it goes blank.
I have attached the client and server files, can anyone solve my problem?
Thanks in advance.
//server file
import java.net.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.util.*;
import java.text.*;
import java.awt.*;
import java.awt.event.*;
public class MessageCenter extends javax.swing.JFrame {
public MessageCenter() {
initComponents();
private void initComponents() {
jLabel1 = new JLabel();
jScrollPane1 = new JScrollPane();
jTextArea1 = new JTextArea();
jPanel1 = new JPanel();
jLabel5 = new JLabel();
jLabel3 = new JLabel();
jButton1 = new JButton();
jButton2 = new JButton();
jLabel2 = new JLabel();
jLabel4 = new JLabel();
menuBar = new JMenuBar();
fileMenu = new JMenu();
Start = new JMenuItem();
jSeparator1 = new JSeparator();
Stop = new JMenuItem();
jSeparator2 = new JSeparator();
Exit = new JMenuItem();
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setTitle("Message Center");
setMaximizedBounds(new java.awt.Rectangle(0, 0, 560, 700));
setBounds(0,0,600,700);
setName("");
jLabel1.setBackground(new java.awt.Color(255, 255, 255));
jLabel1.setFont(new java.awt.Font("Georgia", 1, 24));
jLabel1.setForeground(new java.awt.Color(34, 44, 106));
jLabel1.setHorizontalAlignment(SwingConstants.CENTER);
jLabel1.setText("Message Center");
jLabel1.setIconTextGap(0);
getContentPane().add(jLabel1, java.awt.BorderLayout.NORTH);
jTextArea1.setColumns(20);
jTextArea1.setFont(new java.awt.Font("Book Antiqua", 0, 12));
jTextArea1.setLineWrap(true);
jTextArea1.setRows(25);
jTextArea1.setBorder(null);
jScrollPane1.setViewportView(jTextArea1);
getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
jPanel1.setLayout(new java.awt.GridLayout(1, 6, 10, 5));
jPanel1.add(jLabel5);
jPanel1.add(jLabel3);
jButton1.setText("Start");
jPanel1.add(jButton1);
jButton2.setText("Stop");
jPanel1.add(jButton2);
jPanel1.add(jLabel2);
jPanel1.add(jLabel4);
getContentPane().add(jPanel1, java.awt.BorderLayout.SOUTH);
fileMenu.setText("File");
Start.setText("Start");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
System.out.println("hello");
StartActionPerformed(evt);
fileMenu.add(Start);
fileMenu.add(jSeparator1);
Stop.setText("Stop");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
StopActionPerformed(evt);
fileMenu.add(Stop);
fileMenu.add(jSeparator2);
Exit.setText("Exit");
fileMenu.add(Exit);
menuBar.add(fileMenu);
setJMenuBar(menuBar);
pack();
private void StartActionPerformed(java.awt.event.ActionEvent evt) {
try{
Server t=new Server(jTextArea1);
t.listenSocket();
catch(Exception e)
e.printStackTrace();
private void StopActionPerformed(java.awt.event.ActionEvent evt) {
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MessageCenter().setVisible(true);
private JMenuItem Exit;
private JMenuItem Start;
private JMenuItem Stop;
private JMenu fileMenu;
private JButton jButton1;
private JButton jButton2;
private JLabel jLabel1;
private JLabel jLabel2;
private JLabel jLabel3;
private JLabel jLabel4;
private JLabel jLabel5;
private JPanel jPanel1;
private JScrollPane jScrollPane1;
private JSeparator jSeparator1;
private JSeparator jSeparator2;
public JTextArea jTextArea1;
private JMenuBar menuBar;
class ClientThread implements Runnable {
private Socket client;
JTextArea jt;
ClientThread(Socket client,JTextArea jt) {
this.client = client;
this.jt=jt;
public void run(){
try{
//DataInputStream dis= new DataInputStream(client.getInputStream());
DataInputStream dis= new DataInputStream(new BufferedInputStream(client.getInputStream()));
System.out.println("client connected");
//BufferedReader dis = new BufferedReader(new InputStreamReader(s.getInputStream()));
String msg=null;
byte msg1[]=new byte[200];
while(true)
try{
if(dis.available()>0)
dis.readFully(msg1,0,dis.available());
// System.out.println("Msg is ==> "+new String(msg1));
new PrinterThread(jt,new String(msg1)).start();
msg1=new byte[200];
Thread.sleep(1000);
}catch (Exception e) {
System.out.println("Exception ");
} catch (IOException e) {
System.out.println("Exception occurred");
class Server {
JTextArea jt;
public Server(JTextArea jt)
this.jt=jt;
public void listenSocket() throws Exception
ServerSocket ss=null;
try{
ss=new ServerSocket(8000);
System.out.println("Server started");
catch (IOException e) {
System.out.println("Exception");
System.exit(-1);
while(true){
ClientThread w;
try{
w = new ClientThread(ss.accept(),jt);
Thread t = new Thread(w);
t.start();
catch (IOException e) {
System.out.println("Accept failed: 8000");
public static void main(String args[])throws Exception {
/*Server t=new Server();
t.listenSocket();*/
class PrinterThread extends Thread
public PrinterThread(JTextArea jt1,String msg)
jTextArea1 = jt1;
this.msg=msg;
System.out.println("PrinterThread constructor ");
public void run()
try
Date today;
SimpleDateFormat formatter;
String output;
String pattern="dd.MM.yyyy '@' H:mm";
formatter = new SimpleDateFormat(pattern);
today = new Date();
output = formatter.format(today);
System.out.println(" "+output+" "+msg+" \n");
jTextArea1.append(" "+output+" "+msg+" \n");
jTextArea1.updateUI();
jTextArea1.revalidate();
// JOptionPane.showMessageDialog(null,"hi");
//System.out.println("Get text "+jTextArea1.getText());
catch (Exception exception) {}
private JComboBox combo;
private JTextArea jTextArea1;
String msg=null;
//client.java
import java.net.*;
import java.io.*;
import java.io.File;
public class client {
public static void main(String args[]) {
try {
Socket ss=new Socket(InetAddress.getLocalHost(),8000);
DataOutputStream dos=new DataOutputStream(ss.getOutputStream());
for(int i=1;i<100;i++){
if((i%2)==0)
dos.writeBytes("1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,3233");
else
dos.writeBytes("1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42");
Thread.sleep(5000);
catch(Exception e) {
e.printStackTrace();
System.out.println(" ");
}You need to run your Server in a separate Thread.
Right now its running in the GUI Event Thread.I created new thread for my server, now it's updating jtextarea.
Thank you very much. -
Problem updating textField via menuItem
I am new to java and I am having a problem getting a menuItem to update a text field in my swing app. The following code is a striped down version but contains the necessary code to repeat my problem.
I'm sure it is something fairly simple, but have had no luck finding a solution. All I want is for a menuItem to update the textfield once selected.
How can I fix this?
Please help.
/* this class test an implementation of JmenuItem and textfield
where the menuItem is suppose to update the text in the textField*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MenuItemTest
private GridBagLayout layout;
private GridBagConstraints constraints;
private JTextField termField;
private JLabel headerLabel;
private JLabel termLabel;
private JMenuBar menuBar;
private JMenu menu;
private JMenuItem menuItem;
public MenuItemTest()
// create GUI components
headerLabel = new JLabel("ItemMenu TextField Test");
termLabel = new JLabel("Field:");
termField = new JTextField("choose MenuItem");
public Container createContentPane()
//Create the content-pane-to-be.
JPanel contentPane = new JPanel(new BorderLayout());
contentPane.setOpaque(true);
layout = new GridBagLayout();// new gridbaglayout
JPanel p = new JPanel(layout); // set frame layout
constraints = new GridBagConstraints(); // instantiate constraints
// add components to JPane
setConstraints( 1,0,6,1,1,10);
p.add(headerLabel,constraints);
setConstraints( 2,1,1,1,1,2);
p.add(termLabel,constraints);
setConstraints(2,2,2,1,1,2);
p.add(termField,constraints);
contentPane.add(p, BorderLayout.CENTER);
return contentPane;
}// end createContentPane()
// method for simplifying grabBagConstraints
private void setConstraints(int row, int column, int width, int height,
int fill, int ipady)
constraints.gridx = column; // set gridx
constraints.gridy = row; // set gridy
constraints.gridwidth = width; // set gridwidth
constraints.gridheight = height; // set gridheight
constraints.insets = new Insets(1,1,0,0);//set uniform vertical gap
constraints.fill = fill;
constraints.ipady = ipady;
}// end method addComponent
//class for build menu bar
public class MCalMenu
public JMenuBar createMenuBar()
//implements menu handler
MenuHandler handler = new MenuHandler();
//Create the menu bar.
menuBar = new JMenuBar();
menu = new JMenu("Menu");
menuBar.add(menu);
//a group of JMenuItems
menuItem = new JMenuItem("Preset Field 1");
menuItem.addActionListener(handler);
menu.add(menuItem);
menuItem = new JMenuItem("Preset Field 2");
menuItem.addActionListener(handler);
menu.add(menuItem);
menuItem = new JMenuItem("Preset Field 3");
menuItem.addActionListener(handler);
menu.add(menuItem);
return menuBar;
}// end createMenuBar method
}//end class MCalMenu
// class for menu events
public class MenuHandler extends JDialog implements ActionListener
public void actionPerformed(ActionEvent e)
if ( e.getActionCommand() == "Preset Field 1")
termField.setText("1");
}//end if
else if (e.getActionCommand() == "Preset Field 2")
termField.setText("2");
}//end else if
else if (e.getActionCommand() == "Preset Field 3")
termField.setText("3");
}//end else if
}// end actionPerformed method
}// end MenuHandler class
public void createAndShowGUI()
JFrame frame = new JFrame("MenuItem TextField Update Fail");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MenuItemTest myMenuItemTest = new MenuItemTest();
MCalMenu myMCalMenu = new MCalMenu();
frame.setJMenuBar(myMCalMenu.createMenuBar());
frame.setContentPane(myMenuItemTest.createContentPane());
frame.setSize(200, 200);
frame.setVisible(true);
public static void main( String args [] )
MenuItemTest myMenuItemTest = new MenuItemTest();
myMenuItemTest.createAndShowGUI();
}I think that your problem is that your createAndShowGUI method is creating two separate and distinct objects when you run this program: a MenuItemTest object and a MCalMenu object. As distinct objects, they don't share instance variables which means that this program has two termField JTextFields, one which is visible and the other which is not visible and which you are trying to change. This won't work.
The other problem is here:
if ( e.getActionCommand() == "Preset Field 1")don't compare strings with ==. Better to use the String method equals(...) -
If someone could help, I would greatly appreciate it. The problem involves a JSplitPane, which is a Tab within a JTabbedPane, where
the TopComponent (which contains a JComboBox) passes an argument to the Class that represents the BottomComponent to display detail information. The Class(Mgmt_Contact - BottomComponent) is
receiving the parameter and processes but the data does not display. I have SOP messages that indicate the data is being formatted correctly. I'm really confused and desperately need help. The problem deals with addressing the BottomComponent of the JSplitPane from the Class that represents the TopComponent.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Home extends JFrame{
private JTabbedPane tabbedPane;
public Home(){
super("The Travel Agency Model");
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
system.exit(0);
}); // end of WindowListener
tabbedPane = new JTabbedPane(SwingConstants.LEFT);
tabbedPane.setBackground(Color.blue);
tabbedPane.setForeground(Color.white);
populateTabbedPane();
getContentPane().add(tabbedPane);
buildMenu();
} // end of constructor
private void buildMenu(){
JMenuBar mb = new JMenuBar();
JMenu menu = new JMenu("File");
JMenuItem item = new JMenuItem("Exit");
item.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
System.exit(0);
}); //end of addActionListener
menu.add(item);
mb.add(menu);
setJMenuBar(mb);
} // end of buildMenu
// create tabs with titles
private void populateTabbedPane(){
tabbedPane.addTab("Management", null,
new Management(), "Select the Management ");
} // end of populateTabbedPane
public static void main(String[] args){
Home dl = new Home();
dl.pack();
dl.setSize(800, 620);
dl.setBackground(Color.white);
dl.setVisible(true);
// end of Home class
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class Management extends JPanel implements ChangeListener{
private JTabbedPane propPane;
public Management(){
propPane = new JTabbedPane(SwingConstants.TOP);
propPane.setSize(795, 550);
propPane.addChangeListener(this);
populateTabbedPane();
add(propPane);
} // end of constructor
// create tabs with titles
private void populateTabbedPane(){
propPane.addTab("Management", null, new Mgmt(), "Management");
propPane.addTab("Management Contact", null, new Management_Contact(),
"Management Contact");
} // end of populateTabbedPane
public void stateChanged(ChangeEvent e){
System.out.println("\n\n ****** Management.java " + propPane.getSelectedIndex() + " " + propPane.getTabPlacement());
public static void main(String[] args){
Home dl = new Home();
dl.pack();
dl.setSize(800, 620);
dl.setBackground(Color.white);
dl.setVisible(true);
} // end of Management class
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.io.*;
public class Mgmt extends JPanel{
public Mgmt() {
} // end of Mgmt class
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class Management_Contact extends JPanel {
Mgmt_Class mgmt = null;
Mgmt_Contact mgmtContact = null;
public Management_Contact() {
JSplitPane split = new JSplitPane();
split.setOrientation(JSplitPane.VERTICAL_SPLIT);
Mgmt_Header hdr = new Mgmt_Header();
split.setTopComponent(hdr);
Mgmt_Contact mgmtContact = new Mgmt_Contact();
JScrollPane scrollPane = new JScrollPane(mgmtContact,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setPreferredSize(new Dimension(650,300));
split.setBottomComponent(scrollPane);
add(split);
} // end of Management class
import java.util.Vector;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Mgmt_Header extends JPanel implements ActionListener{
private JComboBox cmbMgmt;
private JTextField txtMgmtAddr1;
private JTextField txtMgmtAddr2;
private JPanel pWork;
private Box vertBox;
private Box topBox;
private Box midBox;
private Box botBox;
private Mgmt_Class mClass = null;
private Mgmt_Contact cnt = null;
Vector mgmtVct = null;
public Mgmt_Header(){
vertBox = Box.createVerticalBox();
topBox = Box.createHorizontalBox();
midBox = Box.createHorizontalBox();
botBox = Box.createHorizontalBox();
mClass = new Mgmt_Class();
mgmtVct = new Vector();
cmbMgmt = new JComboBox();
cmbMgmt.addItem(" ");
mgmtVct = mClass.bldMgmtHeader();
for (int x1=0; x1<mgmtVct.size() ;x1++ )
mClass = (Mgmt_Class)mgmtVct.get(x1);
cmbMgmt.addItem(mClass.getManagementName());
System.out.println("MgmtHeader " + mgmtVct.size() + " " + cmbMgmt.getItemCount());
cmbMgmt.setEditable(false);
cmbMgmt.setBackground(Color.white);
cmbMgmt.setName("cmbMgmt");
cmbMgmt.setPreferredSize(new Dimension(250,27));
cmbMgmt.setFont(new Font("Times-Roman",Font.PLAIN,12));
cmbMgmt.addActionListener(this);
pWork = new JPanel();
pWork.setLayout(new FlowLayout(FlowLayout.CENTER));
pWork.setBorder(BorderFactory.createTitledBorder(" Select Management Name or Enter Code "));
pWork.add(new JLabel("Name: "));
pWork.add(cmbMgmt);
topBox.add(pWork);
txtMgmtAddr1 = new JTextField("Address line 1",15);
txtMgmtAddr1.setEditable(false);
txtMgmtAddr2 = new JTextField("Address line 2",15);
txtMgmtAddr2.setEditable(false);
midBox.add(midBox.createVerticalStrut(10));
botBox.add(new JLabel("Address:"));
botBox.add(topBox.createHorizontalStrut(15));
botBox.add(txtMgmtAddr1);
botBox.add(topBox.createHorizontalStrut(15));
botBox.add(txtMgmtAddr2);
vertBox.add(topBox);
vertBox.add(midBox);
vertBox.add(botBox);
add(vertBox);
} // end of constructor
public void actionPerformed(ActionEvent evt){
if (evt.getSource() instanceof JComboBox){
if (((JComboBox)evt.getSource()).getName() == "cmbMgmt"){
int sel = ((JComboBox)evt.getSource()).getSelectedIndex();
System.out.println("ActionListener " + sel + " " +
((JComboBox)evt.getSource()).getItemAt(sel) + " " +
cmbMgmt.getItemAt(sel));
Mgmt_Class mClass = (Mgmt_Class)mgmtVct.get(sel - 1);
System.out.println("From Vector " + mClass.getAddress1() + " " +
mClass.getAddress2() + " " + mClass.getManagementCode());
txtMgmtAddr1.setText(mClass.getAddress1());
txtMgmtAddr2.setText(mClass.getAddress2());
System.out.println("\n\nListener " + ((JComboBox)evt.getSource()).getSelectedItem() + " " + (((JComboBox)evt.getSource()).getSelectedIndex()) );
int mCode = mClass.getManagementCode();
Mgmt_Contact cnt = new Mgmt_Contact(mCode);
System.out.println("\n After new Mgmt_Contact constructor");
} // end of JComboBox
} // end of actionPerformed
} // end of Mgmt_Header class
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.io.*;
public class Mgmt_Contact extends JPanel{
private Mgmt_Contact_Class contact = null;
private JTextField txtFName = null;
private JTextField txtLName = null;
private JTextField txtAddr1 = null;
private JTextField txtAddr2 = null;
private JButton btnUpd = null;
private JButton btnNew = null;
private JButton btnDel = null;
private JButton btnNext = null;
private JButton btnPrior = null;
private JPanel cntct = null;
private JPanel pWork = null;
private JPanel pWest = null;
private JPanel pSouth = null;
private JPanel pCenter = null;
public Mgmt_Contact() {
System.out.println("\n MgmtContact default constructor");
contact = new Mgmt_Contact_Class();
bldPage();
System.out.println("\n ******* After bldPage() routine");
public Mgmt_Contact(int mCode) {
System.out.println("\n MgmtContact second constructor " + mCode);
Vector mgmtVct = new Vector();
contact = new Mgmt_Contact_Class();
mgmtVct = contact.bldMgmtContactTbl(mCode);
contact =(Mgmt_Contact_Class)mgmtVct.get(0);
System.out.println("\n ******* Management Contact Table *** " + contact.getFirstName());
bldPage();
System.out.println("\n ******* After bldPage() routine");
public void bldPage(){
System.out.println("\n MgmtContact bldPage ");
cntct = new JPanel();
cntct.setLayout(new BorderLayout());
pWest = new JPanel();
pWest.setLayout(new GridLayout(0,1));
pCenter = new JPanel();
pCenter.setLayout(new GridLayout(0,1));
pSouth = new JPanel();
pWork = new JPanel();
pWork.setLayout(new FlowLayout(FlowLayout.LEFT));
pWest.add(new JLabel("First :"));
txtFName = new JTextField(15);
txtFName.setText(contact.getFirstName());
System.out.println("\n First Name " + txtFName.getText() + " " +
contact.getFirstName());
txtFName.setPreferredSize(new Dimension(200,27));
pWork.add(txtFName);
pWork.add(new JLabel("Last :"));
txtLName = new JTextField(15);
txtLName.setText(contact.getLastName());
txtLName.setPreferredSize(new Dimension(200,27));
pWork.add(txtLName);
pCenter.add(pWork);
pWork = new JPanel();
pWork.setLayout(new FlowLayout(FlowLayout.LEFT));
pWest.add(new JLabel("Address :"));
txtAddr1 = new JTextField(15);
txtAddr1.setText(contact.getAddress1());
txtAddr1.setPreferredSize(new Dimension(200,27));
pWork.add(txtAddr1);
pWork.add(new JLabel(" "));
txtAddr2 = new JTextField(15);
txtAddr2.setText(contact.getAddress2());
txtAddr2.setPreferredSize(new Dimension(200,27));
pWork.add(txtAddr2);
pCenter.add(pWork);
pWork = new JPanel();
pWork.setLayout(new FlowLayout(FlowLayout.LEFT));
btnNew = new JButton(" Add ");
btnUpd = new JButton("Update");
btnDel = new JButton("Delete");
btnNext = new JButton(" Next ");
btnPrior = new JButton(" Prior ");
pSouth.add(btnNew);
pSouth.add(btnUpd);
pSouth.add(btnDel);
pSouth.add(btnNext);
pSouth.add(btnPrior);
cntct.add("West", pWest);
cntct.add("Center", pCenter);
cntct.add("South", pSouth);
add(cntct);
} // end of Mgmt_Contact classRepaint/revalidate will work but what I didn't explain is that the components on each side are also containers and the user events for the contained, non-opaque components are handled transparently to my code.
Is there a way to get the JSplitPane to automatically update both sides so that I don't have to catch all possible user events? (Scrolling, key punching, tree expanding, button pressing, etc).
OR
How can I detect that the split pane is updating one side so I can run repaint/revalidate on the other side?
Thanks! -
I want to set background color of JMenuBar as red.
So I used both setOpaque(true) method and setBackground(Color.red).
It works in other L&F.
But once I set Nimbus L&F, my JMenuBar is displayed just grey color.
Is it known bug in Nimbus?@splungebob: A typical use case is the selecton of a "range" instead of a single value, e.g. a minimum and a maximum.
@845767: I had the same problem and modified another multiknob example from the web to do what I want (range selection). The result looks quite nice, even under Nimbus L&F. I tried to post my modified code here but it was to long. I will try again if I found a good solution to upload it somewhere.
Update: uploaded the JRrangeSlider code : [url http://codeviewer.org/view/code:186e]here (see [url http://www.welfenlab.de/fileadmin/forschung/gebiete/YaDiV/yadiv_rangeslider.jpg]screenshot).
Still, a pure Nimbus L&F Solution using the original slider would be nice also.
Cheers;
Ingo
Edited by: k.i. f. on 21.03.2011 02:23
Maybe you are looking for
-
I am using a doc formatted on excel --- how do i resize the doc to fit on one page?
I am using a document that was formatted in excel (on a PC) --- how do i resize the document to print on one page?
-
Start up problems on iMac version 10.7.3
i recently bought a brand new 27 inch imac intel core duo i5. it has the latest software 10.7.3. sometimes when i start it up it takes ages to load then i have to "log in" however i haven't selected to log in. when it finally loads its really glitchy
-
Thinkpad T420 GPU usage always shows 100% in Power Manager
Did anyonce face the same problem before? Mine was a i7 2620M+HD3000 T420. When I open the power manager, I fount my CPU usage is around 30~40% and my GPU uasage is 100% stable... I didnt open any game when I open the power manager. Anyone know wheth
-
How do I change my tab and new page opening settings?
Every time I click on a link of any kind, it opens a new tab. This includes things like clicking a youtube video after finishing a different one, which should just go to the video in the same tab, not open a new one. How do I get it to stop opening n
-
Hi!!! I have a question, exists some incompatibility or change the path's on the Libraries in oracle??? Thank's and regards