Programming Swing components

I have to use an information dialog. I'm using this code:
JOptionPane.showMessageDialog(frame, title);
The problem is that the button that appear in the dialog always says "Aceptar" and I want to change "Aceptar" and write another title but I don't know how can I change it.

Use this method :
JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options) The options is an array of objects that will be converted to String.
So you can just put :
Object[] options=new Object[2];
options[0]="Ok, ok";
options[1]="Forget it !";Does that help ?
BadLands

Similar Messages

Swing Components not displaying in a JFrame

Hi,
I have a JFrame with a couple of JLabels, JButtons etc. and a Choice Combo Box
my problem is that when i run the program the only component that gets displayed at first is Choice and in order for me to see the swing components i have to roll over them with my mouse and the JLabels dont even display when i do that..
Does anyone know how i can fix this please?
here is my code
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.awt.Image.*;
import java.io.*;
import java.net.*;
public class ImageViewerAnim extends JFrame {
 private JLabel perc, scale;
 private JTextField inPercent;
 private JButton draw, muteOn;
 private JPanel sPanel;
 private String[] pics = {"Earth", "Moon", "Jupiter", "Pluton", "Neptun"};
 private String[] picsFile = {"images/earth.gif", "images/moon.gif", "images/jupiter.jpg", "images/pluton.jpg", "images/neptun.jpg"};
 private String[] soundsFile = {"sounds/tada.wav", "sounds/notify.wav", "sounds/ding.wav", "sounds/chimes.wav", "sounds/chimes.wav"};
 private Choice ch;
 private Image pic;
 private AudioClip sound = null;
 private int scaleAm = 0;
 private int origScale = 500;
 private int finalScale = 0;
 private boolean proceed = true;
 public ImageViewerAnim() {
 Container c = getContentPane();
 c.setLayout(new BorderLayout());
 sPanel = new JPanel();
 ch = new Choice();
 for(int i = 0; i < pics.length; ++i) {
 ch.add(pics);
 scale = new JLabel("Scale");
 perc = new JLabel("%");
 inPercent = new JTextField(5); // scale value input field
 draw = new JButton("Draw");
 draw.setBorder(BorderFactory.createEtchedBorder());
 draw.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 int index = 0;
 index = ch.getSelectedIndex();
 pic = null;
 repaint();
 pic = (Toolkit.getDefaultToolkit().getImage(picsFile[index]));
 try{
 File f = new File(soundsFile[index]);
 sound = Applet.newAudioClip(f.toURL());
 }catch(MalformedURLException mfe) {
 mfe.printStackTrace();
 if(!inPercent.getText().equals("")) {
 scaleAm = Integer.parseInt(inPercent.getText()); // get the scale amount from the user
 finalScale = ((origScale * scaleAm)/100); // calculate the final scale amount based on what the user entered
 }else {
 finalScale = origScale; // default to original size of the image if no value for scale was entered
 // creates a scaled instance of an image and takes the amount of scale as an argument
 repaint();
 sound.loop();
 muteOn = new JButton("Mute On");
 muteOn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 sound.stop();
 muteOn.setText("MuteOff");
 sPanel.add(ch);
 sPanel.add(scale);
 sPanel.add(inPercent);
 sPanel.add(perc);
 sPanel.add(draw);
 sPanel.add(muteOn);
 c.add(sPanel, BorderLayout.SOUTH);
 repaint();
public void paint(Graphics g) {
 if(pic!=null) {
 g.drawImage(pic,0,0,this);
public static void main(String args[]) {
 ImageViewerAnim app = new ImageViewerAnim();
 app.setSize(500,500);
 app.setVisible(true);
 app.setDefaultCloseOperation(EXIT_ON_CLOSE);
 app.show();
thank you in advance
Ivo

for future reference
i was able to fix this by adding
super.paint(g);in the first line of my paint method
Ivo

Issue viewing Swing components

I currently am able to compile, but not view Swing components. I am running Windows Media Center Edition with Radeon X300 graphics card. Swing programs execute but I only see the border window with only grey content inside. I have 1gb of memory and have tried running very small applications with the same effect. Does Java not support my OS? Any ideas?

Some sample code follows that doesn't work for me
At odd times I can see some of the swing applications I try to run, but it isn't consistent. This makes me think it is a memory problem, but I'm not sure. The following application takes 19,040 K with 373688 K available physical memory.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class DefaultButton {
public static void main(String args[]) {
Runnable runner = new Runnable() {
public void run() {
JFrame frame = new JFrame("DefaultButton");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(2, 2, 10, 10));
JButton button1 = new JButton("Text Button");
button1.setMnemonic(KeyEvent.VK_B);
frame.add(button1);
Icon warnIcon = new ImageIcon("Warn.gif");
JButton button2 = new JButton(warnIcon);
frame.add(button2);
JButton button3 = new JButton("Warning", warnIcon);
frame.add(button3);
String htmlButton = "<html>HTML Button " +
"Multi-line";
JButton button4 = new JButton(htmlButton);
frame.add(button4);
JRootPane rootPane = frame.getRootPane();
rootPane.setDefaultButton(button2);
frame.setSize(300, 200);
frame.setVisible(true);
EventQueue.invokeLater(runner);
}

Trying to understand "thread-safe" w/ swing components

The other day there was a big hullabaloo about some code I posted because I was calling JLabel.setText from a thread that wasn't the ui thread. On the other hand, this thread was the only thread making changes to the JLabel. My understanding is that in any kind of multi-threaded system, if you just have 1 writer / changer, then no matter how many readers there are, this is thread-safe. So why what I was doing not thread safe?
Second question - JLabel.setText() is essentially setting data in the model for JLabel, which then gets picked up and displayed the next time the GUI thread paints it. So if it's not safe to update a JLabel's model, I assume its never safe to update any data that also is being displayed visually. So for instance, if I was showing some database table data in a JTable, I should do the update in the UI thread - probably not. But what is the distinction?
Third question - what swing components and what operations need to be run on the UI thread to call your program "thread-safe". Validate? setSize()? setLocation()? add? remove? Is there anything that can be called on swing components from a non-ui thread?
Edited by: tjacobs01 on Nov 2, 2008 8:29 PM

tjacobs01 wrote:
My understanding is that in any kind of multi-threaded system, if you just have 1 writer / changer, then no matter how many readers there are, this is thread-safe. So why what I was doing not thread safe?This is not true. As I mentioned in that hullabaloo thread, the Java Memory Model allows threads to cache values of variables they use. This means that values written by one thread are not guaranteed to ever be visible to other threads, unless you use proper synchronization.
Take the following example:
import java.util.concurrent.TimeUnit;
public class ThreadExample {
    static class Foo {
        private String value = "A";
        public String getValue() {
            return value;
        public void setValue(String value) {
            this.value = value;
    public static void main(String[] args) {
        final Foo foo = new Foo();
        Thread writer = new Thread() {
            @Override
            public void run() {
                try {
                    TimeUnit.SECONDS.sleep(1);
                    foo.setValue("B");
                } catch (InterruptedException e) {
                    e.printStackTrace();
        Thread reader = new Thread() {
            @Override
            public void run() {
                try {
                    TimeUnit.MINUTES.sleep(1);
                    System.out.println(foo.getValue());
                } catch (InterruptedException e) {
                    e.printStackTrace();
        writer.start();
        reader.start();
}Here two different threads both access the same Foo instance, which is initialized with a value of "A". One thread, the writer, sleeps one second, and then sets foo's value to "B". The other thread, the reader, sleeps one minute (to avoid race conditions) and then prints foo's value to System.out. It may seem obvious that the reader thread will read the value "B", but this is in fact not guaranteed to be true. The reader thread may never see the value that was written by the writer thread, so it may very well read the old value "A".
(If you run the code you will probably see "B" printed out, but again, this is not guaranteed behavior.)
A simple way to fix this is to synchronize access to the mutable state that the two threads share. For example, change the class Foo to
    static class Foo {
        private String value = "A";
        public synchronized String getValue() {
            return value;
        public synchronized void setValue(String value) {
            this.value = value;
    }It's for this same reason that you often see the use of a volatile boolean as a control flag for stopping threads, rather than a plain old boolean. The use of volatile guarantees that the thread you want to stop actually sees the new value of the flag once it has been set by another thread.
Here is an article that touches some of this stuff:
[http://www.ibm.com/developerworks/java/library/j-jtp02244.html]
I also highly recommend the book "Java Concurrency in Practice" (one of the authors of which, David Holmes, sometime hangs out on the Concurrency forum here, I believe).
Edited by: Torgil on Nov 2, 2008 9:01 PM

How to use Swing Components in JavaFX

Hi All,
I am new to JavaFx. I am trying to use java swing components in javafx.
I found a sample program in net and tried it. But it shows compile time error.
Code:
MySwingComponent .fx
import javafx.ext.swing.SwingComponent;
import javax.swing.JComponent;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
* @author nandha
class MySwingComponent extends SwingComponent{
var button: JButton;
public var text: String on replace {
button.setText(text);
public var action: function();
override protected function createJComponent () : JComponent {
button = new JButton();
button.addActionListener(ActionListener {
public override function actionPerformed(e:ActionEvent){
action();
return button;
The above code shows no error.
Test SwingButton.fx
import javafx.stage.Stage;
import javafx.scene.Scene;
import swingcomponents.MySwingButton;
* @author nandha
Stage {
title: "Swing Button Example"
scene: Scene {
width: 250
height: 80
content: [
MySwingButton{ // error message: imcompatible type. found MySwingButton. Required javafx.scene.Node[]
text: "Click Me!"
action: function(){
println("Hello World!");
This code which used the MySwingButton shows error: imcompatible type. found MySwingButton. Required javafx.scene.Node[] - where i have added the MySwingButton.
Please help me to fix the error.
Thanks &Regards,
Nandha K

Hi Sasa,
First thanks for your reply.
I found the problem and have fixed.
Problem:
There is no class MySwingButton in the package swingcomponents. Its MySwingComponent that i should have used, which is a big mistake that i have done. To my surprise i don't know NetBeans didn't show any error message at that line.
Thanks & Regards,
Nandha K

Developing new Swing Components - Visibility problems with UI classes

I was wondering if anyone out there had run into the following problems when developing new Swing components. If so it might be worth banding together and putting pressure on Sun to fix them. However, if no one else develops new Swing components then I guess I'm just a lone voice...
I have been writing a new dockable toolpanel Swing component and when it came to implementing the UI manager I was unable to access many of the standard features in basic and metal LAFs because they had been made package protected. This forced me to reimplement quite a bit of existing code which took time as well as being bad practice.
While in some cases I can understand this from a security POV I am pretty sure that in this case it is the result of lazy programming practice. Appart from basic architectural reasons for this I have noticed a trend where newer code seems to suffer from this more than the original code. The practice of using package protection reminds me of C++ style coding, or just that of an inexperienced developer who does not understand the need to code for extensibility.
An additional problem arises because the Security manager stops you cheating the system by putting new classes into the javax.swing.plaf... package structure. Thus the only way to solve this nicely is a proper fix.
This would entail going through all the UI PLAF classes and rationalizing the visibility to either public or protected as appropriate. Really there should be minimal use of package protection unless it is vital for security concerns.
Some Examples (there are many more):
javax.swing.plaf.basic.LazyActionMap
javax.swing.plaf.basic.BasicBorders.RolloverMarginBorder
javax.swing.plaf.basic.BasicBorders.SplitPaneDividerBorder (why are just these two classes package protected when all the others are public?)
javax.swing.plaf.metal.MetalUtils
javax.swing.plaf.metal.MetalBumps
Anyway, I am happy to give advice to other poor saps who wind up fighting the UI manager but it would be better if we could get Sun to sort out this mess (after all they created it).
Cheers, Lewis

It may be more a case of creating new Swing components and trying to provide support for all the standard LnFs.
This is very awkward although you can sometimes achieve what you want by borrowing resources from UIManager (a border here, an icon there etc.).
Essentially the problem is that Swing is designed to have new components added to it but the standard LnFs aren't quite so accommodating!

Swing Components and Fullscreen Exclusive

Hi, I am trying to write a program that can switch between full screen and windowed mode seamlessly, while still being able to use standard swing components. I have never worked with the full screen exclusive mode before and am having trouble getting the components to repaint properly.
The following code works fine in the windowed and undecorated modes, however when I switch to fullscreen exclusive mode all components disappear and only repaint upon mouseover or other interaction. Calls to repaint do not make any difference.
import java.awt.Dimension;
import java.awt.DisplayMode;
import java.awt.FlowLayout;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.WindowConstants;
public class FullscreenTests {
     private static boolean hwlast = false;
     private static GraphicsDevice dev = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
     public static void main(String[] args) {
          final JFrame fMain = new JFrame("Title");
          fMain.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
          fMain.getRootPane().setLayout(new FlowLayout());
          JButton win = new JButton("Windowed");
          win.addActionListener(new ActionListener () {
               public void actionPerformed (ActionEvent e) {
                    setWindowed(fMain);
          fMain.getRootPane().add(win);
          JButton ful = new JButton("Fullscreen");
          ful.addActionListener(new ActionListener () {
               public void actionPerformed (ActionEvent e) {
                    setFullscreen(fMain);
          fMain.getRootPane().add(ful);
          JButton hw = new JButton("HW Fullscreen");
          hw.addActionListener(new ActionListener () {
               public void actionPerformed (ActionEvent e) {
                    setHWFullscreen(fMain);
          fMain.getRootPane().add(hw);
          setWindowed(fMain);
     public static void setWindowed(JFrame f) {
          if (hwlast == true) {
               dev.setFullScreenWindow(null);
               hwlast = false;
          f.dispose();
          f.setIgnoreRepaint(false);
          f.setUndecorated(false);
          Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
          f.setSize(new Dimension(808,634));
          f.setMinimumSize(new Dimension(808,634));
          f.setLocation((d.width-f.getWidth())/2, (d.height-f.getHeight())/2);
          f.setVisible(true);
     public static void setHWFullscreen(JFrame f) {
          hwlast = true;
          f.dispose();
          f.setUndecorated(true);
          f.setIgnoreRepaint(true);
          f.setVisible(true);
          dev.setFullScreenWindow(f);
          dev.setDisplayMode(new DisplayMode(800, 600, 32, DisplayMode.REFRESH_RATE_UNKNOWN));
     public static void setFullscreen(JFrame f) {
          if (hwlast == true) {
               dev.setFullScreenWindow(null);
               hwlast = false;
          f.dispose();
          f.setIgnoreRepaint(false);
          f.setUndecorated(true);
          f.setSize(Toolkit.getDefaultToolkit().getScreenSize());
          f.setLocation(0,0);
          f.setVisible(true);
}On the same note, if there are better ways of doing this I would be glad to know. This is just a quick test so I haven't done any checks etc when switching to fullscreen exclusive.

   public static void setHWFullscreen (JFrame f) {
      hwlast = true;
      f.dispose ();
      f.setUndecorated (true);
      f.setIgnoreRepaint (true);
      // add this
      Graphics g = f.getGraphics ();
      f.paintAll (g);
      f.setVisible (true);
      dev.setFullScreenWindow (f);
      dev.setDisplayMode (new DisplayMode (800, 600, 32, DisplayMode.REFRESH_RATE_UNKNOWN));
   }db

JDBC-ODBC Bridge, Swing Components

This program displays information from the Access database Autos.mdb.
Uses the JDBC-ODBC Bridge.
Requires a DSN called Autos pointing to Auto.mdb
I am using the swing components and can't seem to set up my combobox to pull the right data which doesn't display any of the data from the database. I am able to do it using AWT but would like a sleeker look so I am trying to convert. I have made the text bold where I am having the problem. Any insight would be greatful! I am very new to JDBC-ODBC so please go easy on me...
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JDBCApp extends Frame implements ItemListener
     //Declare database variables
     Connection conVehicle;
     Statement cmdVehicle;
     ResultSet rsVehicle;
     boolean blnSuccessfulOpen = false;
     //Declare components
     JComboBox lstManuf   = new JComboBox();
     JLabel lblModel = new JLabel("                          ");
     JLabel lblYear        = new JLabel("                          ");
     JLabel lblCost      = new JLabel("                          ");
     JLabel lblID      = new JLabel("                              ");
     JLabel lblInstructions = new JLabel("Select Manufacturer to Display Record");
     public static void main(String args[])
          //Declare an instance of this application
          JDBCApp thisApp = new JDBCApp();
          thisApp.createInterface();
     public void createInterface()
          //Load the database and set up the frame
          loadDatabase();
          if (blnSuccessfulOpen)
               setTitle("Display Auto's Database");
               addWindowListener(new WindowAdapter()
                         public void windowClosing(WindowEvent event)
                              stop();
                              System.exit(0);
               setLayout(new FlowLayout());
               add(new JLabel("Manufacturer"));
               add(lstManuf);
               lstManuf.addItemListener(this);
               add(lblInstructions);
               add(new JLabel("Model"));
               add(lblModel);
               add(new JLabel("Year"));
               add(lblYear);
               add(new JLabel("Cost"));
               add(lblCost);
               add(new JLabel("Vehicle Identification"));
               add(lblID);
               setSize(300,300);
               setVisible(true);
          else
               stop();             //Close any open connection
               System.exit(-1);    //Exit with error status
          public void loadDatabase()
               try
                    //Load the MicroSoft drivers
                    Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver");
               catch (ClassNotFoundException err)
                         //No drivers found
                         System.err.println("Driver did not load properly");
               try
                    //Connect to the database
                    conVehicle = DriverManager.getConnection("jdbc:odbc:Auto");
                    //Create a ResultSet
                    cmdVehicle = conVehicle.createStatement();
                    rsVehicle = cmdVehicle.executeQuery(
                                        "Select * from Vehicle;");
                    loadNames(rsVehicle);
                    blnSuccessfulOpen = true;
               catch(SQLException error)
                    System.err.println("Error: " + error.toString());
     public void loadNames(ResultSet rsVehicle)
          try
               //Fill last name list box
               while(rsVehicle.next())
               lstManuf.addItem(rsVehicle.getString("Manufacturer"));
          catch (SQLException error)
               System.err.println("Error in display record");
     public void itemStateChanged(ItemEvent event)
          //Display the selected record
          lblInstructions.setText("");          String strManufName = lstManuf.getText();
          try
               Statement cmdVehicle = conVehicle.createStatement();
               ResultSet rsVehicle = cmdVehicle.executeQuery(
                    "Select * from Vehicle where [Manufacturer] = '" + strManufName + "';");
               DisplayRecord(rsVehicle);
          catch(SQLException error)
               System.err.println("Error in recordset");
      public void DisplayRecord(ResultSet rsVehicle)
           try
               //Display information
               if(rsVehicle.next()) //If more records remain
                    lblModel.setText(rsVehicle.getString("ModelName"));
                    lblYear.setText(rsVehicle.getString("Year"));
                    lblCost.setText(rsVehicle.getString("CostValue"));
                    lblID.setText(rsVehicle.getString("VehicleID"));
               else
                    System.err.println("No more records");
          catch (SQLException error)
               System.err.println("Error in display record");
     public void stop()
          try
               //Terminate the connection
               if (conVehicle != null)
                    conVehicle.close();
          catch(SQLException error)
               System.err.println("Unable to disconnect");
}

I am going to help you out but first I would like to advise you not to do this.
Mixing JDBC and Swing (or any GUI for that matter) like this is not the preferred way to proceed. If you want to learn JDBC then command line/shell is fine. If you want to learn Swing learn Swing. When you want to use the two together learn about MVC first.
I am advising you to do this because nobody writes code like this (mixing GUI and database and business logic all in one class). So if you want real world training MVC should be what you look at next.
See http://en.wikipedia.org/wiki/Model-view-controller for more
As near as I can tell your problem is mostly just because you aren't using the combo box correctly. Try
String strManufName = lstManuf.getSelectedItem().toString();it's a bit of a hack but will work for your purposes. What you need in the eend is to use the methods JComboxBox has like getSelectedItem() or getSelectedIndex().
See http://java.sun.com/docs/books/tutorial/uiswing/components/combobox.html for more.
Some other comments.
1) It's nice to see you aren't just swallowing exceptions but some of them are kind of pointless if you just continue on. Like here
try
//Load the MicroSoft drivers
Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver");
catch (ClassNotFoundException err)
//No drivers found
System.err.println("Driver did not load properly");
}And then you continue on with the method. What for? There's no point since the driver didn't load.
2) Please look into the use of PreparedStatements. Very good things those. You can use them in place of your Statements. They are safer but for your purposes help you by you not having to worry about the formatting of data you bind to queries. For example what happens if a manufacturer name contains a ' (single quote) ? Trouble that's what. PreparedStatements make that problem go away.
3) Don't use SELECT *. It is always good practice to put the names of the columns you are selecting. This prevents your code from breaking if the order of the columns should change in any way.

Changing AWT components to Swing components

I'm having a little trouble changing some AWT components to Swing components. I received an error message when I tried to run my program. I looked up the component in the java docs. But, I did not see the option the error was talking about. The error and the area of code is listed below. Thank you for any help you can provide.
Error message:
Exception in thread "main" java.lang.Error: Do not use P5AWT.setLayout() use P5A
WT.getContentPane().setLayout() instead
at javax.swing.JFrame.createRootPaneException(JFrame.java:446)
at javax.swing.JFrame.setLayout(JFrame.java:512)
at P5AWT.<init>(P5AWT.java:56)
at P5AWT.main(P5AWT.java:133)
Press any key to continue . . .
Code:
JPanel p3 = new JPanel();
p3.setLayout(new FlowLayout(FlowLayout.CENTER));
ta = new JTextArea(20, 60);
p3.add(ta);
setLayout(new FlowLayout(FlowLayout.CENTER));
add(p3);

you need to change the line...
setLayout(new FlowLayout(FlowLayout.CENTER)); to
getContentPane().setLayout(new FlowLayout(FlowLayout.CENTER));

How can I learn "Drag and Drop" with Swing components?

Hello,
Im using swing components, so using paint() to draw a "drag icon" doesnt seem acceptable. Im basically trying to move a JPanel image to be dragged/dropped over another JPanel in the same program/applet.
I looked at Sun's Java Tutorial for information on doing drag and drop, but there was no trail completed yet.
Does anyone know of any good resources to learn? Or can at least give me a general idea of how to do drag and drop?

Did you see this?
http://java.sun.com/docs/books/tutorial/dnd/index.html
http://java.sun.com/docs/books/tutorial/reallybigindex.html

Unicode font for swing components

Hi all,
I'd like to set a Swing component (a JLabel) to a particular font so it will properly display Unicode Greek text. I've been reading all about physical vs. logical fonts, and I've read through the various Sun docs/faqs on Internationalization, Fonts, and Unicode, but I just can't get this to work. I think I'm missing something more basic here about selecting my font. My test word is the Greek "khairete," with an accent over the iota. Here is the Unicode:
\u03c7\u03b1\u1f77\u03c1\u03b5\u03c4\u03b5
The trick is that accented iota.
I can launch an xterm that shows the characters I want like this:
$ xterm -fn -misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1 &
That tells me that if I can get Java to use that font, then I'm all set. I'm trying the following test program:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
public class GUI extends JFrame {
public static final String MESSAGE = "\u03c7\u03b1\u1f77\u03c1\u03b5\u03c4\u03b5";
public GUI() throws Exception {
super();
Font[] fonts;
Container container;
JLabel label;
fonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
for (int j=0;j<fonts.length;j++) {
System.out.println(fonts[j]);
container = getContentPane();
container.setLayout(new GridLayout(0, 1));
// try with the default font
label = new JLabel(MESSAGE);
container.add(label);
printFont(label.getFont());
// see what the default font looks like when PLAIN (to compare with fonts below)
label = new JLabel(MESSAGE);
label.setFont(label.getFont().deriveFont(Font.PLAIN, 12));
container.add(label);
printFont(label.getFont());
// this looks the same as the default font, meaning we didn't find what we asked for.
label = new JLabel(MESSAGE);
label.setFont(new Font("-misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1", Font.PLAIN, 12));
container.add(label);
printFont(label.getFont());
// this also falls back to the default.
label = new JLabel(MESSAGE);
label.setFont(Font.getFont("-misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1"));
container.add(label);
printFont(label.getFont());
// this (of course) falls back to the default.
label = new JLabel(MESSAGE);
label.setFont(Font.getFont("not a font name"));
container.add(label);
printFont(label.getFont());
// try every font we've got!
for (int j = 0; j < fonts.length; j++) {
label = new JLabel(fonts[j] + ": " + MESSAGE);
label.setFont(fonts[j].deriveFont(Font.PLAIN, 12));
container.add(label);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
show();
public static void printFont(Font f) {
System.out.println(f);
if (f != null) {
public static void main(String[] args) throws Exception {
GUI me = new GUI();
But nothing in this code succeedings in printing \u1f77. As I've said, the plain old xterm can do it. I think my problem is that I haven't successfully referenced the desired font in the Java code. But how do I do this? These are the fonts available to me, according to the code above:
java.awt.Font[family=Bitstream Charter,name=Bitstream Charter,style=plain,size=1]
java.awt.Font[family=Bitstream Charter,name=Bitstream Charter Bold,style=plain,size=1]
java.awt.Font[family=Bitstream Charter,name=Bitstream Charter Bold Italic,style=plain,size=1]
java.awt.Font[family=Bitstream Charter,name=Bitstream Charter Italic,style=plain,size=1]
java.awt.Font[family=Courier,name=Courier,style=plain,size=1]
java.awt.Font[family=Courier 10 Pitch,name=Courier 10 Pitch,style=plain,size=1]
java.awt.Font[family=Courier 10 Pitch,name=Courier 10 Pitch Bold,style=plain,size=1]
java.awt.Font[family=Courier 10 Pitch,name=Courier 10 Pitch Bold Italic,style=plain,size=1]
java.awt.Font[family=Courier 10 Pitch,name=Courier 10 Pitch Italic,style=plain,size=1]
java.awt.Font[family=Courier,name=Courier Bold,style=plain,size=1]
java.awt.Font[family=Courier,name=Courier Bold Italic,style=plain,size=1]
java.awt.Font[family=Courier,name=Courier Italic,style=plain,size=1]
java.awt.Font[family=Cursor,name=Cursor,style=plain,size=1]
java.awt.Font[family=Lucida Bright,name=Lucida Bright Demibold,style=plain,size=1]
java.awt.Font[family=Lucida Bright,name=Lucida Bright Demibold Italic,style=plain,size=1]
java.awt.Font[family=Lucida Bright,name=Lucida Bright Italic,style=plain,size=1]
java.awt.Font[family=Lucida Bright,name=Lucida Bright Regular,style=plain,size=1]
java.awt.Font[family=Lucida Sans,name=Lucida Sans Demibold,style=plain,size=1]
java.awt.Font[family=Lucida Sans,name=Lucida Sans Demibold Oblique,style=plain,size=1]
java.awt.Font[family=Lucida Sans,name=Lucida Sans Oblique,style=plain,size=1]
java.awt.Font[family=Lucida Sans,name=Lucida Sans Regular,style=plain,size=1]
java.awt.Font[family=Lucida Sans Typewriter,name=Lucida Sans Typewriter Bold,style=plain,size=1]
java.awt.Font[family=Lucida Sans Typewriter,name=Lucida Sans Typewriter Bold Oblique,style=plain,size=1]
java.awt.Font[family=Lucida Sans Typewriter,name=Lucida Sans Typewriter Oblique,style=plain,size=1]
java.awt.Font[family=Lucida Sans Typewriter,name=Lucida Sans Typewriter Regular,style=plain,size=1]
java.awt.Font[family=Luxi Mono,name=Luxi Mono Bold,style=plain,size=1]
java.awt.Font[family=Luxi Mono,name=Luxi Mono Bold Oblique,style=plain,size=1]
java.awt.Font[family=Luxi Mono,name=Luxi Mono Oblique,style=plain,size=1]
java.awt.Font[family=Luxi Mono,name=Luxi Mono Regular,style=plain,size=1]
java.awt.Font[family=Luxi Sans,name=Luxi Sans Bold,style=plain,size=1]
java.awt.Font[family=Luxi Sans,name=Luxi Sans Bold Oblique,style=plain,size=1]
java.awt.Font[family=Luxi Sans,name=Luxi Sans Oblique,style=plain,size=1]
java.awt.Font[family=Luxi Sans,name=Luxi Sans Regular,style=plain,size=1]
java.awt.Font[family=Luxi Serif,name=Luxi Serif Bold,style=plain,size=1]
java.awt.Font[family=Luxi Serif,name=Luxi Serif Bold Oblique,style=plain,size=1]
java.awt.Font[family=Luxi Serif,name=Luxi Serif Oblique,style=plain,size=1]
java.awt.Font[family=Luxi Serif,name=Luxi Serif Regular,style=plain,size=1]
java.awt.Font[family=Utopia,name=Utopia Bold,style=plain,size=1]
java.awt.Font[family=Utopia,name=Utopia Bold Italic,style=plain,size=1]
java.awt.Font[family=Utopia,name=Utopia Italic,style=plain,size=1]
java.awt.Font[family=Utopia,name=Utopia Regular,style=plain,size=1]
java.awt.Font[family=dialog,name=dialog,style=plain,size=1]
java.awt.Font[family=dialog,name=dialog.bold,style=plain,size=1]
java.awt.Font[family=dialog,name=dialog.bolditalic,style=plain,size=1]
java.awt.Font[family=dialog,name=dialog.italic,style=plain,size=1]
java.awt.Font[family=dialoginput,name=dialoginput,style=plain,size=1]
java.awt.Font[family=dialoginput,name=dialoginput.bold,style=plain,size=1]
java.awt.Font[family=dialoginput,name=dialoginput.bolditalic,style=plain,size=1]
java.awt.Font[family=dialoginput,name=dialoginput.italic,style=plain,size=1]
java.awt.Font[family=monospaced,name=monospaced,style=plain,size=1]
java.awt.Font[family=monospaced,name=monospaced.bold,style=plain,size=1]
java.awt.Font[family=monospaced,name=monospaced.bolditalic,style=plain,size=1]
java.awt.Font[family=monospaced,name=monospaced.italic,style=plain,size=1]
java.awt.Font[family=sansserif,name=sansserif,style=plain,size=1]
java.awt.Font[family=sansserif,name=sansserif.bold,style=plain,size=1]
java.awt.Font[family=sansserif,name=sansserif.bolditalic,style=plain,size=1]
java.awt.Font[family=sansserif,name=sansserif.italic,style=plain,size=1]
java.awt.Font[family=serif,name=serif,style=plain,size=1]
java.awt.Font[family=serif,name=serif.bold,style=plain,size=1]
java.awt.Font[family=serif,name=serif.bolditalic,style=plain,size=1]
java.awt.Font[family=serif,name=serif.italic,style=plain,size=1]
javax.swing.plaf.FontUIResource[family=Dialog,name=Dialog,style=bold,size=12]
java.awt.Font[family=Dialog,name=Dialog,style=plain,size=12]
java.awt.Font[family=dialog,name=-misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1,style=plain,size=12]
javax.swing.plaf.FontUIResource[family=Dialog,name=Dialog,style=plain,size=12]
javax.swing.plaf.FontUIResource[family=Dialog,name=Dialog,style=plain,size=12]
Apparently, I need to use the correct "name" to specify the font. So my next try was this:
$ xlsfonts -ll -fn -misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1
name: -misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1
direction: left to right
indexing: matrix
rows: 0x00 thru 0x30 (0 thru 48)
columns: 0x00 thru 0xff (0 thru 255)
all chars exist: no
default char: 0x0000 (0)
ascent: 14
descent: 4
font type: Character Cell
bounds: width left right asc desc attr keysym
min 9 0 0 -3 -13 0x0000
max 9 8 9 14 4 0x0000
properties: 23
FONTNAME_REGISTRY
FOUNDRY Misc
FAMILY_NAME Fixed
WEIGHT_NAME Medium
SLANT R
SETWIDTH_NAME Normal
ADD_STYLE_NAME
PIXEL_SIZE 18
POINT_SIZE 120
RESOLUTION_X 100
RESOLUTION_Y 100
SPACING C
AVERAGE_WIDTH 90
CHARSET_REGISTRY ISO10646
CHARSET_ENCODING 1
COPYRIGHT Public domain font. Share and enjoy.
XMBDFEDINFO 654
CAP_HEIGHT 10
X_HEIGHT 7
FONT -Misc-Fixed-Medium-R-Normal--18-120-100-100-C-90-ISO10646-1
WEIGHT 10
RESOLUTION 138
QUAD_WIDTH 9
name: -misc-fixed-medium-r-normal--18-120-100-100-c-90-iso10646-1
direction: left to right
indexing: matrix
rows: 0x00 thru 0x30 (0 thru 48)
columns: 0x00 thru 0xff (0 thru 255)
all chars exist: no
default char: 0x0000 (0)
ascent: 14
descent: 4
font type: Character Cell
bounds: width left right asc desc attr keysym
min 9 0 0 -3 -13 0x0000
max 9 8 9 14 4 0x0000
properties: 23
FONTNAME_REGISTRY
FOUNDRY Misc
FAMILY_NAME Fixed
WEIGHT_NAME Medium
SLANT R
SETWIDTH_NAME Normal
ADD_STYLE_NAME
PIXEL_SIZE 18
POINT_SIZE 120
RESOLUTION_X 100
RESOLUTION_Y 100
SPACING C
AVERAGE_WIDTH 90
CHARSET_REGISTRY ISO10646
CHARSET_ENCODING 1
COPYRIGHT Public domain font. Share and enjoy.
XMBDFEDINFO 654
CAP_HEIGHT 10
X_HEIGHT 7
FONT -Misc-Fixed-Medium-R-Normal--18-120-100-100-C-90-ISO10646-1
WEIGHT 10
RESOLUTION 138
QUAD_WIDTH 9
(Yes, xlsfonts prints two entries.)
Here is a bit more data:
[pjungwir@mccurdy unicode_gui]$ uname -a
Linux mccurdy.nfic.com 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386 GNU/Linux
[pjungwir@mccurdy unicode_gui]$ cat /etc/redhat-release
Red Hat Linux release 8.0 (Psyche)
[pjungwir@mccurdy unicode_gui]$ java -version
java version "1.4.2_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_01-b06)
Java HotSpot(TM) Client VM (build 1.4.2_01-b06, mixed mode)
If anyone has any suggestions, I would really appreciate it. I'd like to find an answer that doesn't involve editing the font.properties file.
Thanks,
--Paul

Hi Sojan,
first up, forget the notion of even tinkering with the font.properties file if you can. It's an old, outdated method of setting up the fonts that Sun doesn't even support any more. Use setFont() where you can, and die trying in the process! ;-)
One thing I would check is which font each AWT component currently thinks it has. It's easy enough to set the font system wide with Swing components, but I'm not sure if that capability extends to AWT components (I've certainly had trouble with it in various places in the past). While you've set up the Chinese font correctly, your AWT components might still be stuck with the Java default (Helvetica, or whatever it is, which is incapable of displaying Chinese), and hence displaying the rectangles because they don't know how to handle the foreign characters. You might need to set SimSun as the font for each of your AWT components individually at a worst-case scenario.
Hope that helps,
Martin Hughes

How to avoid multiple redraws of Swing components?

I have this problem every time I work with swing components. For example, I am creating my own JCalendar. I have a combobox to change the month and two buttons to move to the next and previous months.
Naturally when you press the next month button the combobox should by updated by the program to reflect the new month.
The problem is, I redraw my JCalendar if the user changes the combobox and when the user presses a button. So when the user presses a button, I get the event from the button which redraws the calendar, and then I get another event as a result of the combobox being changed by my program. So I get two events, and two redraws of my calendar which tends to make it a little sluggish.
Should I just remove my comobox listener temporarily when the user presses the "Next Month" or "Prev Month" buttons?
I've encounted this type of problem before, so I must just have a bad design. Should I just create a method for JCalendar called update()? Tehn technically I could update the model of my JCalendar and not have the UI updated unless the user calls update().

Why don't you do the redraw only when the combo box changes and not when the buttons are pressed. Since the buttons always change the combo box anyway. The buttons change the combo box and the combox calls the redraw.

Release memory from Swing components

Ive experiencing memory leak when using swing components in a custom node object.
When I set the node to null or just delete it from my group node the garbage collector kicks in but when I add a swing component the memory clogs up quickly.
Ive been using the code below for adding a swing component:
insert textField = SwingTextField {
columns: 20
borderless: false;
width: beginBalk - 5;
height: 30;
enabled:false;
text: "Sample text";
editable: false;
} into grp.content;
grp is a common Group node and other component are added aswell.
The complete group node is added to another group which if I want to refresh I use:
delete grp from rootGrp.content;
rootGroup is the other group node that is added to a scene.
I works fine without the swing components so it has got nothing to do with other objects in the group.
Hope anyone has the solution for this,

Hi Hugo,
I'haven't got the solution but perharps the way for destructing the SwingComp can be different.
Has I understood the jvm keep object in survival space until it is referenced by the program.
So If you use
delete comp for group.contentthe jvm probably keep a reference on the comp object.
You can try
delete group.content[idx]instead, then you can adjust jvm garbage collection if the problem persists.

Extending Swing Components

I would like to create my own Swing components that I wish to use in my Java GUI programs. I would like to create my own lightweight components and also to create things such as:
Round buttons
Sliders
etc
I also need to know how to create metallic skins for my Swing application.
Please can someone give me any simple examples of how to create custom components and also how to create skins of interfaces or give me some URLs that teach you.
Thanks in advance
Riz

I think your best bet is to look at the source of the LookAndFeel's provided with the swing download, mac/windows/motif/metal/basic and figure it all out. I don't know of any detailed sites to help make look and feels.

Swing components in applet not working in web browser

Hi Guys,
I've created an applet which makes use of some swing components, but unfortunately, not all of them function properly in my web browser (internet explorer or Mozilla Firefox). Its mainly the buttons; the last buttons works and displays the correct file within the broswer, but the first 5 buttons do not work...
any help please on how I can sort this problem out?
Heres the code for my applet:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;
public class MainAppWindow extends JApplet
int gapBetweenButtons = 5;
final JPanel displayPanel = new JPanel(new BorderLayout());
public void init()
 //Panel for overall display in applet window.
 JPanel mainPanel = new JPanel(new BorderLayout());
 mainPanel.add(new JLabel(new ImageIcon(getClass().getResource("images/smalllogo2.gif"))),BorderLayout.NORTH);
 //sub mainPanel which holds all mainPanels together.
 JPanel holdingPanel = new JPanel(new BorderLayout());
 //Panel for displaying all slide show and applications in.
 displayPanel.setBackground(Color.white);
 displayPanel.add(new JLabel(new ImageIcon(getClass().getResource("images/IntroPage.jpg"))),BorderLayout.CENTER);
 displayPanel.setPreferredSize(new Dimension(590,400));
 JPanel buttonPanel = new JPanel(new GridLayout(6,1,0,gapBetweenButtons));
 buttonPanel.setBackground(Color.white);
 JButton button1 = new JButton("User guide");
 button1.addActionListener(
 new ActionListener() {
 public void actionPerformed(ActionEvent e)
 if(displayPanel.getComponents().length > 0)displayPanel.removeAll(); // If there are any components in the mainPanel, remove them and then add label
 displayPanel.setBackground(Color.white);
 displayPanel.add(new JLabel(new ImageIcon("images/UserGuide.jpg")));
 displayPanel.revalidate(); // Validates displayPanel to allow changes to occur onto it, allowing to add different number images/applicaions to it.
 JButton button2 = new JButton("What is a Stack?");
 button2.addActionListener(
 new ActionListener() {
 public void actionPerformed(ActionEvent e)
 if(displayPanel.getComponents().length > 0)displayPanel.removeAll();
 displayPanel.setBackground(Color.white);
 displayPanel.add(new JLabel(new ImageIcon("images/WhatIsAStack.jpg")));
 displayPanel.revalidate();
 JButton button3 = new JButton("STACK(ADT)");
 button3.addActionListener(
 new ActionListener() {
 public void actionPerformed(ActionEvent e)
 if(displayPanel.getComponents().length > 0)displayPanel.removeAll();
 displayPanel.setBackground(Color.white);
 displayPanel.add(new JLabel(new ImageIcon("images/StackADT.jpg")));
 displayPanel.revalidate();
 JButton button4 = new JButton("Stacks in the Real World");
 button4.addActionListener(
 new ActionListener() {
 public void actionPerformed(ActionEvent e)
 if(displayPanel.getComponents().length > 0)displayPanel.removeAll();
 displayPanel.setBackground(Color.white);
 displayPanel.add(new JLabel(new ImageIcon("images/StacksInTheRealWorld.jpg")));
 displayPanel.revalidate();
 JButton button5 = new JButton("DEMONSTRATION");
 button5.addActionListener(
 new ActionListener() {
 public void actionPerformed(ActionEvent e)
 if(displayPanel.getComponents().length > 0)displayPanel.removeAll();
 Demonstration app = new Demonstration();
 JPanel appPanel = app.createComponents();//gets the created components from Demonstration application.
 appPanel.setBackground(Color.pink);
 displayPanel.add(appPanel);
 displayPanel.revalidate();
 JButton button6 = new JButton("Towers Of Hanoi");
 button6.addActionListener(
 new ActionListener() {
 public void actionPerformed(ActionEvent e)
 if(displayPanel.getComponents().length > 0)displayPanel.removeAll();
 TowerOfHanoi app = new TowerOfHanoi();
 JPanel appPanel = app.createComponents();//gets the created components from Towers of Hanoi
 JPanel mainPanel = new JPanel();//panel used to centralise the application in center
 mainPanel.add(appPanel);
 mainPanel.setBackground(Color.pink); //sets mainPanel's background color for 'Towers Of Hanoi'
 displayPanel.add(mainPanel);
 displayPanel.revalidate();
 //adding buttons to the buttonPanel.
 buttonPanel.add(button1);
 buttonPanel.add(button2);
 buttonPanel.add(button3);
 buttonPanel.add(button4);
 buttonPanel.add(button5);
 buttonPanel.add(button6);
 JPanel p = new JPanel(); // Used so that the buttons maintain their default shape
 p.setBackground(Color.white);
 p.add(buttonPanel);
 holdingPanel.add(p,BorderLayout.WEST);
 holdingPanel.add(displayPanel,BorderLayout.CENTER);
 //Positioning of holdingPanel in mainPanel.
 mainPanel.add(holdingPanel,BorderLayout.CENTER);
 //indent mainPanel so that its not touching the applet window frame.
 mainPanel.setBorder(BorderFactory.createEmptyBorder(10,20,10,20));
 mainPanel.setBackground(Color.white);
 mainPanel.setPreferredSize(new Dimension(850,600)); //size of applet window
 mainPanel.setOpaque(false); // Needed for Applet
 this.setContentPane(mainPanel);
}

Thanks for the response. I don't quite understand what you're talking about though. I have, in my humble knowledge, done nothing with packages. I have put the applet class (WiaRekenToolActiz.class is the applet class) in the jar file wia_actiz_archive.jar. From what I read on the tutorial, java looks for the applet class in all the jar files specified. Since I put my CODEBASE as the main url, I thought it baiscally didn't matter where you out the html file.
I shall include the complete html page complete with applet tag to perhaps illuminate a bit more what I mean...
<html>
<head>
<title>Wia Rekenmodule hello!</title>
</head>
<body bgcolor="#C0C0C0">
<applet
CODEBASE= "http://www.creativemathsolutions.nl/test"
ARCHIVE= "Actiz/wia_actiz_archive.jar, Generic/wia_archive.jar"
CODE="WiaRekenToolActiz.class"
WIDTH=915 HEIGHT=555
>
<PARAM NAME = naam VALUE = "Piet Janssen">
<PARAM NAME = gebdag VALUE = "01">
<PARAM NAME = gebmaand VALUE = "06">
<PARAM NAME = gebjaar VALUE = "1970">
<PARAM NAME = geslacht VALUE = "man">
<PARAM NAME = dienstjaren VALUE = "10">
<PARAM NAME = salaris VALUE = "56500">
<PARAM NAME = deeltijdpercentage VALUE = "100">
<PARAM NAME = accountnaam VALUE = "Zorginstelling 'De Zonnebloem'">
</applet>
</body>
</html>

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