Swing components core design

does the swing components, all the J... components, designed using other swing or AWT components?
I mean a JButton is actually a panel with an image or some thing like that?
I would like to read about these things, does any one know where to find some reading materials on the subject it would be great.
the tutorial of each component as far as i remember does not discus the issue.
thanks, Adam.

i did look at the hierarchy of the components and it didn't tell me anything newIt tells you a JButton is NOT a panel with an image on it!
java.lang.Object
java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              javax.swing.AbstractButton
                  javax.swing.JButtonIt also tells you a lot of the painting code is going to be in AbstractButton with customizations in JButton.

Similar Messages

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!

Configuring Swing components from a database

Hi All
I'd like to be able to configure Swing components with information from a database e.g. text, color, editability etc. One approach I'm considering is extending existing components such a JTextField and adding a configure() method which takes as a parameter the primary key of the database record containing the config info.
Has anyone comes across alternative design patterns for solving this?
Regards
Terry Child

that is what I would do

GUI Builder: Where to get Icons for Swing components

Hi,
I am creating a GUI Builder for Swing GUIs and I am searching for icons representing Swing Components as seen in many GUI Builders like JBuilder.
So I want to have ToggleButtons with icons in a toolbar, to let the user choose what Swing Component to create (e.g. JTextField, JList, etc.).
Are there any free icons for Swing Components?
Thank you very much for your help.
Regards,
Alex

Hi ipooley,
thanks for this reply but I know that page already.
What I am searching for are icons of JComponents like JButton or JTextField etc. . You can see them for example in some GUI builders like JBuilder-Designer and they are looking as if they are Java native.
Regards,
Alex

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.

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>

I can't use swing components in my applets

When I write an applet without any swing components, my browser never has any trouble finding the classes it needs, whether they're classes I've written or classes that came with Java. However, when I try to use swing components it cannot find them, because it is looking in the wrong place:
On my computer I have a directory called C:\Java, into which I installed my Java Development Kit (so Sun's classes are stored in the default location within that directory, wherever that is), and I store my classes in C:\Java\Files\[path depends on package]. My browser gives an error message along the lines of "Cannot find class JFrame at C:\Java\Files\javax\swing\JFrame.class"; it shouldn't be looking for this non-existent directory, it should find the swing components where it finds, for example, the Applet class and the Graphics class.
Is there any way I can set the classpath on my browser? Are the swing components stored separately from other classes (I'm using the J2SE v1.3)?
Thanks in advance.

Without having complete information, it appears that you are running your applets using the browser's VM. Further, I assume you are using either IE or Netscape Navigator pre-v6. In that case, your browser only supports Java 1.1, and Swing was implemented in Java 1.2. You need to use the Java plug-in in order to use the Swing classes (see the Plug-in forum for more information), or else download the Swing classes from Sun and include them in your CLASSPATH.
HTH,
Carl Rapson

Need help with using graphics in swing components

Hi. I'm new to Java and trying to learn it while also developing an application for class this semester. I've been following online tutorials for about 2 months now, though, and so I'm not sure my question counts as a "new to Java" question any more as the code is quite long.
Here is the basic problem. I started coding the application as a basic awt Applet (starting at "Hello World") and about a month in realized that Swing components offer better buttons, panels, layouts, etc. So I converted the application, called BsfAp, to a new JApplet and started adding JPanels and JComponents with layout managers. My problem is, none of the buffered graphics run in any kind of JPanel, only the buttons do. I assume the buffered graphics are written straight to the JApplet top level container instead but I'm not entirely sure.
So as to not inundate the forum with code, the JApplet runs online at:
http://mason.gmu.edu/~dho2/files/sensor.html
The source code is also online at:
http://mason.gmu.edu/~dho2/files/BsfAp.java
What I would like to do is this - take everything in the GUI left of the tabbed button pane and put it into a JScrollPane so that I can use a larger grid size with map display I can scroll around. The grid size I would like to use is more like 700x1000 pixels, but I only want to display about 400x400 pixels of it at a time in the JScrollPane. Then I could also move this JScrollPane around with layout manager. I think this is possible, but I don't know how to do it.
I'm sure the code is not organized or optimized appropriately to those of you who use Java every day, but again I'm trying to learn it. ;-)
Thanks for any help or insight you could provide in this.
Matt

Couple of recs:
* Don't override paint and paint directly on the JApplet. Paint on a JPanel and override paintComponent.
* The simplest way to display a graphic is to put an image into an ImageIcon and show this in a JLabel. This can then easily go inside of the JScrollPane.
* You can also create a graphics JPanel that overrides the paintComponent, draw the image in that and show that inside of the JScrollPane.
* don't call paint() directly. Call repaint if you want the graphic to repaint.
Here's a trivial example quickly put together:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;
import java.lang.reflect.InvocationTargetException;
import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class BsfCrap extends JApplet
    private JPanel mainPanel = new JPanel();
    private JScrollPane scrollPane;
    private JPanel graphicsPanel = new JPanel()
        @Override
        protected void paintComponent(Graphics g)
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D)g;
            RenderingHints rh = new RenderingHints(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
            g2d.setRenderingHints(rh);
            Paint gPaint = new GradientPaint(0, 0, Color.blue,
                40, 40, Color.magenta, true);
            g2d.setPaint(gPaint);
            g2d.fill(new Ellipse2D.Double(0, 0, 800, 800));
    public BsfCrap()
        mainPanel.setPreferredSize(new Dimension(400, 400));
        mainPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
        graphicsPanel.setPreferredSize(new Dimension(800, 800));
        graphicsPanel.setBackground(Color.white);
        scrollPane = new JScrollPane(graphicsPanel);
        scrollPane.setPreferredSize(new Dimension(300, 300));
        mainPanel.add(scrollPane);
    public JPanel getMainPanel()
        return mainPanel;
    @Override
    public void init()
        try
            SwingUtilities.invokeAndWait(new Runnable()
                public void run()
                    setSize(new Dimension(400, 400));
                    getContentPane().add(new BsfCrap().getMainPanel());
        catch (InterruptedException e)
            e.printStackTrace();
        catch (InvocationTargetException e)
            e.printStackTrace();
}

I'd like to make a list of interactive Swing components....

EDIT: I've been doing more research about Layout Managers and it appears that BoxLayout may provide me with the solution I need. I'll mess around with it for awhile and report back if I still need help. Thanks pals!+
I would like to make a list of JPanels laid out in basically a column. One on top of the other. That's not so difficult, but I need to make it able able to add and remove panels in response to user-driven events (in other words, I can't just hard-code them all, and the panels are generated on the fly, so I don't even know how many I'll need to be displaying until I need to display them.
Here's a simple mockup of the window I'm talking about.
|      - o x |
|____________|
|            |
|            |
|   Panel1   |
|   Panel2   |
|   Panel3   |
|   Panel4   |
|____________|At first, I thought a JList would serve my purpose, but you can't add interactive Swing components to JLists (or JTables)... they'll render, but that's all. My panels will contain a button and a checkbox, so this is a no-go.
I was also thinking I could just manage the placement with GridBagLayout and just keep indexes for the current y position, but if there's an easier way, I'd rather not go this route. It has me writing a lot of extra code and manipulating a lot of fields of GridBagConstraints, which opens me to less-understandable code and more error-prone code, on account of I'm great at making little mistakes when I'm setting craploads of constraints.
Does anyone have any ideas? It'd be ideal if there was just some sort of container I could plop them in with add and remove methods (a la JTabbedPane or something).
I'm pretty new to Swing, so maybe I'm missing something obvious.
Edited by: Caryy on Sep 30, 2010 4:15 PM

I would recommend using BoxLayout or Box.createVerticalBox(). As mKorbel already mentioned, you need to call revalidate() after adding any component to an already realized/visible container, and additionally call repaint() after removing a component. To resize the top level window to accommodate its new content, you would call pack(). Or, again as suggested by mKorbel, wrap your panel/Box in a JScrollPane.
db

Showing swing components in the palette og jdeveloper

hello, I have found a problem with jdeveloper, as a user uses jdeveloper since 2 years I have never found a problem like this. (IDE problem).
like habitude I created a simple java project which contains a jframe and an entry class (main class), but when I try to drag and drop from the component palette somes swing components I didn't find
the page of swing components ( I found in the components palette just "my components" page in the jcombobox selection category). this problem will delay a big project and causes big problems
please any person who know some things help me as soon as possible.
Best Regards.

Check this post -
showing palette containing JButton,JLabel,JPanel ... components

About the difference between the AWT components and the swing components

As we know that an AWT component has a peer, but dose a lightweight component(e.g: a swing component) has also a peer? And could somebody tell me that who and how creates the CLICKED_EVENT when I click a JButton(a swing component), and where the CLICKED_EVENT to go util it was processed by a method like btn_ok_clicked(Event e)? And if I click a Button(an AWT component), what's the difference?
Thanks a lot!

The main difference is that AWT are native components, and Swing components are entirely in java written. That's besides the look and feel. There are a lot of other differences between AWT and Swing, and there are better described in the documentation.

Multifont output in Swing components

Hi there,
though I'm not new to Java but I'm new to displaying different fonts in Swing components.
I have an Swing-based application which is running on a Terminal Server. It works fine for Central, Western und Northern Europe. The next
country to roll out is Greece. So what does a greek user see on his monitor when he uses his greek keyboard?
I am writing a test app where I type german text into a JTextField and want to get e.g. the greek representation in another JTextField. How can I achieve this? Converting the bytearray with Cp1253 did not work
Can anybody give me a hint?
Thanks
Dierk.

as I wrote, it is a test app to learn how I get greek
fonts on the screen. Of course the real app is used by
greek users who put greek text into the system. In the
system we do not use resource bundles as the GUI texts
are stored in the database. It is a CMS for product
information in different languages.Ah, I see... mind you, I don't think your German text would have a great deal of Cyrillic characters in them, right? Still, it's only a test! ;-)
Now what I'm doing to get my german text in greek
letters is this:
utf8Bytes =
= getorigTextField().getText().getBytes("UTF16");
isr = new InputStreamReader(new
w ByteArrayInputStream
(utf8Bytes), "Cp1253");
As far as I understand, the InputStreamReader gives
the translation
of my german letters in the encoding of CP1253
(Windows Greek). That
means the unicode characters change into the ones of
the greek language
so I should be able to show them in a Swing component.This is where your problem is. Java's Strings will always be in UTF-16 when they are held internally. So anything within a textfield is going to be UTF-16 no matter what you do with it.
The line you think is converting to Cp1253 is actually trying to convert from Cp1253 to UTF-16.
Hopefully this is the reason your characters aren't appearing - the unneeded conversion above could be mashing them. Instead, you need expect everything to always be in UTF-16, and to expect to display in it (don't worry, it handles any character you can throw at it, let alone Greek). So then it all comes down to the font you're using.
I'm not too sure of the name of the Windows default Cyrillic font, but that would be a logical starting point.
Hope that helps!
Martin Hughes

Hindi Numerals and Hejri calender in swing components

Hi
Are Hindi numerals and Hejri calender supported in JDK 1.4 swing components or not?
Please I need this as soon as possible.
Thanks in advance
Marwa Aboulfadl

hello!
I am developing an arabic editor but i am unable to display the arbic numeric in swing text .Plz help me on this topic and send some code example on this topic.
I have another problem about events i.e how can i handle the beckspace event, enter event, and spaceevent?
plz send me mail .
Thanx for advance.

Swing components not displaying correctly in JApplet

Hello everyone,
I have experienced some strange problems using Swing components on JApplets. Maybe I missed some documentation somewhere and someone can help me out.
The problem is that when I add components like JButtons,
JCheckboxes, JRadioButtons, JTextFields, JPasswordFields,
and JComboBoxes to JApplets, when I view the applet, the
component does not become visible until I move the mouse
pointer over it in the case of buttons. For the JComboBox I have
to hit the mouse key many times on the component to see the list. Has anyone experienced problems like these? Thanks.
Keith

check what is in ur paint(Graphic g) method. if it does nothing, remove the paint(Graphic g) method. if it has some codes, double check ur codes.

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

Swing components core design

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