Accessing a gui component directly via getSource()

Hi,
to access a gui component I can access it by getting its object variable and casting it to its class type, e.g.:
public class Tab02 extends JFrame {
     JTable tab = new JTable (rows, head);
     JTextField txt = new JTextField ("dimensions");
     JTree tree = new JTree(node.getRoot());
class DragDropNode implements TreeSelectionListener, MouseMotionListener, MouseListener {
public void mouseDragged (MouseEvent me ) {
     Cursor dragcurs = new Cursor(13);
// me.getSource().setCursor (mdragcurs) does not work as getSource delivers an object type
     JTree tmp = (JTree)me.getSource();
// me.getSource().setCursor (mdragcurs)
     tmp.setCursor (mdragcurs);     // as me.getSource().setCursor (mdragcurs)
     JTable tmp = (JTable )me.getSource();
     tmp.setCursor (mdragcurs);
How can I cast the object automatically to the genuine type?
Is there a method that returns the type and I can use this method to cast me.getSource()?
Thanks

Navigate to the folder enclosing it and enter Library in the Go to Folder command.
(70632)

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Here are the results:
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Schedule
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TCP    [::]:135               [::]:0                 LISTENING
1060
RpcSs
[svchost.exe]
TCP    [::]:445               [::]:0                 LISTENING
4
Can not obtain ownership information
TCP    [::]:623               [::]:0                 LISTENING
4124
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TCP    [::]:16992             [::]:0                 LISTENING
4124
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TCP    [::]:49152             [::]:0                 LISTENING
532
[wininit.exe]
TCP    [::]:49153             [::]:0                 LISTENING
1140
eventlog
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TCP    [::]:49154             [::]:0                 LISTENING
1292
Schedule
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TCP    [::]:49185             [::]:0                 LISTENING
624
[lsass.exe]
TCP    [::]:49187             [::]:0                 LISTENING
600
[services.exe]
TCP    [::]:49192             [::]:0                 LISTENING
3268
PolicyAgent
[svchost.exe]
TCP    [::1]:49179            [::]:0                 LISTENING       2008
[jhi_service.exe]
TCP    [::1]:49237            [::1]:49239            ESTABLISHED     4124
[LMS.exe]
TCP    [::1]:49239            [::1]:49237            ESTABLISHED     4124
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UDP    0.0.0.0:123            *:*
1256
W32Time
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UDP    0.0.0.0:500            *:*
1292
IKEEXT
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UDP    0.0.0.0:4500           *:*
1292
IKEEXT
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UDP    0.0.0.0:5355           *:*
1540
Dnscache
[svchost.exe]
UDP    0.0.0.0:21226          *:*
2476
[WAHost.exe]
UDP    127.0.0.1:50083        *:*
1400
gpsvc
[svchost.exe]
UDP    127.0.0.1:55096        *:*
624
[lsass.exe]
UDP    127.0.0.1:60632        *:*
1540
NlaSvc
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UDP    127.0.0.1:64416        *:*
4416
[IntelSmallBusinessAdvantage.exe]
UDP    192.168.100.22:137     *:*
4
Can not obtain ownership information
UDP    192.168.100.22:138     *:*
4
Can not obtain ownership information
UDP    [::]:123               *:*
1256
W32Time
[svchost.exe]
UDP    [::]:500               *:*
1292
IKEEXT
[svchost.exe]
UDP    [::]:4500              *:*
1292
IKEEXT
[svchost.exe]
UDP    [::]:5355              *:*
1540
Dnscache
[svchost.exe]
UDP    [fe80::3447:c85a:1d2d:4ff9%11]:546 *:*
1140
Dhcp
[svchost.exe]

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          {     mySlider[i] = new JSlider( SwingConstants.HORIZONTAL,
                           0, 255, 255 );
               mySlider.setMajorTickSpacing( 10 );
               mySlider[i].setPaintTicks( true );
//      register events for mySlider[i]
               mySlider[i].addChangeListener( handler);
//      setting properties of the textField array
          textField = new JTextField [3];
          for (int i = 0; i < textField.length; i++)
          {     textField[i] = new JTextField("100.00%", 5 );
               textField[i].setEditable(false);
               textField[i].setBackground(Color.white);
// initial Background color of each slider and foreground for each textfield
// accordingly to its current color shade
          mySlider[0].setBackground(
                    new Color ( mySlider[0].getValue(), 0, 0 ) );
          textField[0].setForeground(
                    new Color ( mySlider[0].getValue(), 0, 0 ) );
          mySlider[1].setBackground(
                    new Color ( 0, mySlider[1].getValue(), 0 ) );
          textField[1].setForeground(
                    new Color ( 0, mySlider[1].getValue(), 0 ) );
          mySlider[2].setBackground(
                    new Color ( 0, 0, mySlider[2].getValue() ) );
          textField[2].setForeground(
                    new Color ( 0, 0, mySlider[2].getValue() ) );
// initialize myColor to white
          myColor = Color.WHITE;
// instanciate myPanel for drawing purposes
          myPanel = new CustomPanel();
          myPanel.setBackground(myColor);
// instanciate okButton with its inanymous class
// to handle its related events
          okButton = new JButton ("OK");
          okButton.setToolTipText("To confirm the current color");
          okButton.setMnemonic('o');
          okButton.addActionListener(
               new ActionListener(){
                    public void actionPerformed (ActionEvent e)
                    {     // code permetting to transfer
                         // the current color to the parent
                         // component backgroung color
                         //System.exit( 0 );
//      instanciate exitButton with its inanymous class
//      to handle its related events
          exitButton = new JButton("Exit");
          exitButton.setToolTipText("Exit the application");
          exitButton.setMnemonic('x');
          exitButton.addActionListener(
                    new ActionListener(){
                         public void actionPerformed (ActionEvent e)
                         {     System.exit( 0 );
// define the contentPane
          Container c = getContentPane();
          c.setLayout( new BorderLayout() );
//     panel as container for sliders
          mySliderPanel = new JPanel(new BorderLayout());
//      panel as container for textFields
          textFieldPanel = new JPanel(new FlowLayout());
//      panel as container for Jbuttons components
          buttonPanel = new JPanel ();
          buttonPanel.setLayout( new BoxLayout( buttonPanel, BoxLayout.Y_AXIS ) );
//add the Jbutton components to buttonPanel
          buttonPanel.add(okButton);
          buttonPanel.add(exitButton);
//     add the mySlider components to mySliderPanel
          mySliderPanel.add(mySlider[0], BorderLayout.NORTH);
          mySliderPanel.add(mySlider[1], BorderLayout.CENTER);
          mySliderPanel.add(mySlider[2], BorderLayout.SOUTH);
//add the textField components to textFieldPanel
          for (int i = 0; i < textField.length; i++){
               textFieldPanel.add(textField[i]);
// add the panels to the container c
          c.add( mySliderPanel, BorderLayout.NORTH );
          c.add( buttonPanel, BorderLayout.WEST);
          c.add( textFieldPanel, BorderLayout.SOUTH);
          c.add( myPanel, BorderLayout.CENTER );
          setSize(500, 300);
          show();
//     inner class for mySlider events handling
     private class ChangeHandler implements ChangeListener {
          public void stateChanged( ChangeEvent e )
// start by collecting the current color shade
// for red , forgreen and for blue
               setRedColor(mySlider[0].getValue());
               setGreenColor(mySlider[1].getValue());
               setBlueColor(mySlider[2].getValue());
//The textcolor in myPanel (subclass of JPanel for drawing purposes)
               myPanel.setMyTextColor( ( 255 - getRedColor() ),
                         ( 255 - getGreenColor() ), ( 255 - getBlueColor() ) );
//call to repaint() occurs here
               myPanel.setThumbSlider1( getRedColor() );
               myPanel.setThumbSlider2( getGreenColor() );
               myPanel.setThumbSlider3( getBlueColor() );
// display color value in the textFields (%)
               DecimalFormat twoDigits = new DecimalFormat ("0.00");
               for (int i = 0; i < textField.length; i++){
                    textField[i].setText("" + twoDigits.format(
                              100.0* mySlider[i].getValue()/255) + " %") ;
// seting the textcolor for each textField
// and the background color for each slider
               textField[0].setForeground(
                         new Color ( getRedColor(), 0, 0 ) );
               mySlider[0].setBackground(
                         new Color ( getRedColor(), 0, 0) );
               textField[1].setForeground(
                         new Color ( 0, getGreenColor() , 0 ) );
               mySlider[1].setBackground(
                         new Color ( 0, getGreenColor(), 0) );
               textField[2].setForeground(
                         new Color ( 0, 0, getBlueColor() ) );
               mySlider[2].setBackground(
                         new Color ( 0, 0, getBlueColor() ) );
// color of myPanel background
               myColor = new Color (getRedColor(),
                         getGreenColor(), getBlueColor());
               myPanel.setBackground(myColor);
// set methods to set the basic color shade
     private void setRedColor (int r){
          red = ( (r >= 0 && r <= 255) ? r : 255 );
     private void setGreenColor (int g){
          green = ( (g >= 0 && g <= 255) ? g : 255 );
     private void setBlueColor (int b){
          blue = ( (b >= 0 && b <= 255) ? b : 255 );
// get methods (return the basic color shade)
     private int getRedColor (){
          return red ;
     private int getGreenColor (){
          return green;
     private int getBlueColor (){
          return blue;
     public static Color getMyColor (){
          return myColor;
// main method
     public static void main (String args []){
          MyChooserColor app = new MyChooserColor();
          app.addWindowListener(
                    new WindowAdapter() {
                         public void windowClosing( WindowEvent e )
                         {     System.exit( 0 );
// inner class CustomPanel for drawing purposes
     private class CustomPanel extends JPanel {
          private int thumbSlider1 = 255;
          private int thumbSlider2 = 255;
          private int thumbSlider3 = 255;
          private Color myTextColor;
          public void paintComponent( Graphics g )
               super.paintComponent( g );
               g.setColor(myTextColor);
               g.setFont( new Font( "Serif", Font.TRUETYPE_FONT, 12 ) );
               DecimalFormat twoDigits = new DecimalFormat ("0.00");
               g.drawString( "The RGB values of the current color are : "
                         + "( "     + thumbSlider1 + " , " + thumbSlider2 + " , "
                         + thumbSlider3 + " )", 10, 40);
               g.drawString( "The current background color is composed by " +
                         "the folllowing RGB colors " , 10, 60);
               g.drawString( "Percentage of RED from slider1 : "
                    + twoDigits.format(thumbSlider1*100.0/255), 10, 80 );
               g.drawString( "Percentage of GREEN from slider2 : "
                    + twoDigits.format(thumbSlider2*100.0/255), 10, 100 );
               g.drawString( "Percentage of BLUE from slider3 : "
                    + twoDigits.format(thumbSlider3*100.0/255), 10, 120 );
// call to repaint occurs here
          public void setThumbSlider1(int th){
               thumbSlider1 = (th >= 0 ? th: 255 );
               repaint();
          public void setThumbSlider2(int th){
               thumbSlider2 = (th >= 0 ? th: 255 );
               repaint();
          public void setThumbSlider3(int th){
               thumbSlider3 = (th >= 0 ? th: 255 );
               repaint();
          public void setMyTextColor(int r, int g, int b){
               myTextColor = new Color(r, g, b);
               repaint();
//The following method is used by layout managers
          public Dimension getPreferredSize()
          {     return new Dimension( 150, 100 );
The following is the code of application that tests the component
//Application used to demonstrating
// the homemade GUI MyChooserColor component
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class ShowMyColor extends JFrame {
     private JButton changeColor;
     private Color color = Color.lightGray;
     private Container c;
     MyChooserColor colorComponent;
     public ShowMyColor()
     {     super( "Using MyChooserColor" );
          c = getContentPane();
          c.setLayout( new FlowLayout() );
          changeColor = new JButton( "Change Color" );
          changeColor.addActionListener(
                    new ActionListener() {
                         public void actionPerformed( ActionEvent e )
                         {     colorComponent = new MyChooserColor ();
                              colorComponent.show();
                              color = MyChooserColor.getMyColor();
                              if ( color == null )
                                   color = Color.lightGray;
                              c.setBackground( color );
                              c.repaint();
          c.add( changeColor );
          setSize( 400, 130 );
          show();
     public static void main( String args[] )
     {     ShowMyColor app = new ShowMyColor();
          app.addWindowListener(
                    new WindowAdapter() {
                         public void windowClosing( WindowEvent e )
                         { System.exit( 0 );

Yes, I want help for the missing code to add in actionPerformed method below. As a result, when you confirm the selected color (clicking the OK button), it will be transferred to a variable color of class ShowMyColor.
// instanciate okButton with its inanymous class
// to handle its related events
          okButton = new JButton ("OK");
          okButton.setToolTipText("To confirm the current color");
          okButton.setMnemonic('o');
          okButton.addActionListener(
               new ActionListener(){
                    public void actionPerformed (ActionEvent e)
                    {     // code permetting to transfer
                         // the current color to the parent
                         // component backgroung color
                         //System.exit( 0 );
          );

Updating a GUI component from a runnable class that doesn't know that GUI

Hi. I have a problem that I think isn't solvable in an elegant way, but I'd like to get confirmation before I do it the dirty way.
My application allows the user to save (and load) his work in sessions files. I implemented this by a serializable class "Session" that basically stores all the information that the user created or the settings he made in its member variables.
Now, I obviously want the session files created by this to be as small as possible and therefore I made sure that no GUI components are stored in this class.
When the user has made all his settings, he can basically "run" his project, which may last for a long time (minutes, hours or days, depending on what the user wants to do....). Therefore I need to update the GUI with information on the progress/outcome of the running project. This is not just a matter of updating one single GUI component, but of a dynamic number of different internal frames and panels. So I'd need a reference to a GUI component that knows all these subcomponents to run a method that does the update work.
How do I do that? I cannot pass the reference to that component through the method's argument that "runs" the project, because that needs to be a seperate thread, meaning that the method is just the run() method of that thread which has no arguments (which I cannot modify if I'm not mistaken).
So the only thing I can think of is passing the reference through the constructor of the runnable class (which in turn must be stored in the session because it contains critical information on the user's work). As a result, all components that need to be incorporated in that updating process would be part of the session and go into the exported file, which is exactly what I wanted to avoid.
I hope this description makes sense...
Thanks in advance!

Thanks for the quick answer! Though to be honest I am not sure how it relates to my question. Which is probably my fault rather than yours :-)
But sometimes all it takes me to solve my problem is posting it to a forum and reading it through again :)
Now I wrote a seperate class "Runner" that extends thread and has the gui components as members (passed through its constructor). I create and start() that object in the run method of the original runnable class (which isn't runnable anymore) so I can pass the gui component reference through that run method's argument.
Not sure if this is elegant, but at least it allows me to avoid saving gui components to the session file :-)
I am realizing that probably this post shouldn't have gone into the swing forum...

Accessing a gui component directly via getSource()

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