FocusListener on JFrames not working...

Hi. I have ab application with multiple JFrames. I want to find out when one gains focus. So I made a FocusListener and added it to each JFrame. However, my focusGained and focusLost methods aren't being called....
am I going about this the wrong way?
thanks for any assistance.

Similar Messages

Function to change Boarder Look and feel of Jframe - Not working

Hi all,
In the given SSCE, the functionpublic void changeButtonColor(Component[] comps) to change the border look and feel of JFrame is not working.Please help.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Insets;
import java.util.Vector;
import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
public class ScrollableWrapTest {
    public static void main(String[] args) {
        try {
            final JPanel mainPanel = new JPanel(new WrapScollableLayout(FlowLayout.LEFT, 10, 10));
            mainPanel.setBackground(Color.WHITE);
            JScrollPane pane = new JScrollPane(mainPanel);
            pane.setPreferredSize(new Dimension(320, 200));
            Vector v = new Vector();
            v.add("first");
            JButton button = null;
            for(int i =0;i<v.size();i++){
                    JPanel panel = new JPanel(new BorderLayout());
                    panel.setBackground(Color.WHITE);
                    int num = mainPanel.getComponentCount()+1;
                    button = new JButton("button" + num);
                    button.setPreferredSize(new Dimension(90, 25));
                    JLabel label = new JLabel((String)v.elementAt(i));
                    label.setHorizontalAlignment(SwingConstants.CENTER);
                    panel.add(button, BorderLayout.NORTH);
                    panel.add(label, BorderLayout.SOUTH);
                    mainPanel.add(panel);
                    mainPanel.revalidate();
            ScrollableWrapTest st = new ScrollableWrapTest();
            st.buildGUI(pane);
        } catch (Exception e) {e.printStackTrace();}
    public void buildGUI(JScrollPane scrollPane)
         JFrame frame = new JFrame("Scrollable Wrap Test");
         JFrame.setDefaultLookAndFeelDecorated(true);
        UIManager.put("activeCaption", new javax.swing.plaf.ColorUIResource(Color.LIGHT_GRAY));
        changeButtonColor(frame.getComponents());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(scrollPane, BorderLayout.CENTER);
        frame.setLocationRelativeTo(null);
        frame.pack();
        frame.setVisible(true);
    public void changeButtonColor(Component[] comps)
      for(int x = 0, y = comps.length; x < y; x++)
        if(comps[x] instanceof AbstractButton)
          ((AbstractButton)comps[x]).setBackground(Color.LIGHT_GRAY);
          ((AbstractButton)comps[x]).setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));
        else if (comps[x] instanceof Container)
          changeButtonColor(((Container)comps[x]).getComponents());
    private static class WrapScollableLayout extends FlowLayout {
        public WrapScollableLayout(int align, int hgap, int vgap) {
            super(align, hgap, vgap);
        public Dimension preferredLayoutSize(Container target) {
            synchronized (target.getTreeLock()) {
                Dimension dim = super.preferredLayoutSize(target);
                layoutContainer(target);
                int nmembers = target.getComponentCount();
                for (int i = 0 ; i < nmembers ; i++) {
                    Component m = target.getComponent(i);
                    if (m.isVisible()) {
                        Dimension d = m.getPreferredSize();
                        dim.height = Math.max(dim.height, d.height + m.getY());
                if (target.getParent() instanceof JViewport)
                    dim.width = ((JViewport) target.getParent()).getExtentSize().width;
                Insets insets = target.getInsets();
                dim.height += insets.top + insets.bottom + getVgap();
                return dim;
}Please help.
Rony

You are calling changeButtonColor(frame.getComponents()) before you add the JScrollPane to the content pane.
But why not just move this to the button creation loop?
button = new JButton("button" + num);
button.setBackground(Color.LIGHT_GRAY);
button.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));

FocusListener not working for abstract button

hi,
FocusListener is not working for abstract button...
Is there any other method which work similar to focusGained()...
I think isFocusable() do that... Iam not sure about it.. Could anyone explain about it.
It is needed very urgently.
thanks in advance,
regards,
Deepa Raghuraman

for all JComponent you have the hasFocus() method....

Exporting Crystal Report to HTML is not working in Windows 7

Hi Sir,
I am trying to export Crystal Report to HTML format using VB.NET code. Functionality is working fine at Windows XP Environment (Save to Disk, Open an Application and Email Attachment). But the same functionality is not working at Windows 7 Environment (both 32-Bit as well as 64-Bit).
Below is the code to Exporting Crystal Report to HTML in VB.NET.
Dim CrDiskFileDestinationOptions As New DiskFileDestinationOptions
Dim CrFormatTypeOptions          As New HTMLFormatOptions
Dim vFormat As Integer
Dim CrExportOptions As New ExportOptions
Dim vRdReport As New ReportDocument
Dim sfd As SaveFileDialog
Dim vFileName As String = Nothing
vRdReport = vRptSource
sfd = New SaveFileDialog
If Not (vRptPath = "") Then
    sfd.InitialDirectory = vRptPath
End If
sfd.Filter = "Webpage, Complete(.htm;.htm)|.htm|Web Archive, Single file(.mht)|.mht|Webpage, HTML only(.htm;.html)|.html"
If sfd.ShowDialog = DialogResult.OK Then
    ' Set the disk file options.
     CrDiskFileDestinationOptions.DiskFileName = sfd.FileName.ToString()
Else
     Return
End If
CrExportOptions = vRdReport.ExportOptions
CrFormatTypeOptions.HTMLFileName = vFileName
CrFormatTypeOptions.HTMLEnableSeparatedPages = True
CrFormatTypeOptions.HTMLEnableSeparatedPages = True
CrFormatTypeOptions.HTMLHasPageNavigator = True
CrFormatTypeOptions.UsePageRange = True
With CrExportOptions
                    .ExportDestinationType = ExportDestinationType.DiskFile
                    .ExportFormatType = ExportFormatType.HTML32
                    .DestinationOptions = CrDiskFileDestinationOptions.DiskFileName
                    .FormatOptions = CrFormatTypeOptions
End With
vRdReport.Export()
Catch ex As Exception
        MsgBox(ex.ToString)
End Try
Code working fine at Windows XP, But it is not woking in Windows 7 environment.
Please can anyone share your valuable thoughts or ideas reg. this.
Thanks in Advance
Deivanayaga Perumal D.

user13509659 wrote:
Run this code to reproduce the issue.Which issue?
It looks like inheritance is broken in the component hierarchy for JFrame in Windows 7 JDK 1.6.0_23-b05. The only thing remotely related to inheritance in your code snippet is the WindowListener, which does little. See camickr's advice about built-in exit management.
EDIT - using the post title as a clue, I realize you may be talking about the component hierarchy, and whether the contentPane's background is visible through the upper layers. Instead of guessing, I'd prefer you describe your "issue" accurately (observed vs expected behavior).
Edited by: jduprez on Feb 10, 2011 1:01 PM

Ctrl+tab is not working in editing mode

I have JcheckBox and JTable in my JPanel. When user clicks or presses F2 to edit any cell value of the JTable a comboBox will appear with possible values. (This comboBox is coming from table CellEditor). When user presses ctrl+tab from the table focus should transfer to JComboBox all time. It is working only when the user presses ctrl+tab from the table cell which is not in editing mode. If the user presses ctrl+tab from the table cell which is in editing mode (i.e. focus is on the ComboBox of the cellEditor) it does not work. Please help me to find the solution.
I give a sample code here for your reference.
public class Frame1 extends JFrame {
public Frame1()
super();
this.setLayout( null );
this.setSize( new Dimension(400, 300) );
JTextField ch = new JTextField();
ch.setVisible(true);
ch.setBounds(10, 10, 10, 10);
this.add(ch, null);
DefaultTableModel tmodel = new DefaultTableModel(3, 1);
tmodel.setValueAt("0 0 1",0,0);
tmodel.setValueAt("1 0 1",1,0);
tmodel.setValueAt("2 0 1",2,0);
JTable custLayersTable = new JTable(tmodel);
custLayersTable.getColumnModel().getColumn(0).
setCellEditor(new ComboEditor());
custLayersTable.setBounds(new Rectangle(40, 40, 280, 145));
custLayersTable.setSurrendersFocusOnKeystroke(true);
this.add(custLayersTable, null);
public static void main(String[] args)
Frame1 a = new Frame1();
a.setVisible(true);
final class ComboEditor extends AbstractCellEditor
implements TableCellEditor
public Component getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int row,
int column)
Vector<String> layerValSet = new Vector<String>();
for(int i=0; i<3; i++)
layerValSet.add(row+" "+column+" "+i);
mComboModel = new DefaultComboBoxModel(layerValSet);
mComboModel.setSelectedItem(value);
mEditorComp = new JComboBox(mComboModel);
return mEditorComp;
public Object getCellEditorValue()
return mEditorComp.getSelectedItem();
private DefaultComboBoxModel mComboModel;
private JComboBox mEditorComp;
}

Thanks a lot for your reply.
Since the textField is in a different class i could not use the transferFocus API directly. I tried the following code in the keyreleased event of Combo Box but it was not working.
KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent(
e.getComponent().getParent());
I also tried the following code in stopCellEditing and is not working.
KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent();
Is there any other way to achieve this?

I did write a simple java program but it is not working please help me.....

This is the program I wrote LineRect just to draw a line a rectangle etc...... Y it is not working How can i used the same program to run without using applet that is by using awt and swing.........Pls Help me.............
import java.awt.*;
import java.io.*;
public class LineRect
{public void paint(Graphics g)
     {g.drawLine(10,10, 50,50);
     g.drawRect(10, 60, 40,30);
     g.fillRect(60,10,30,80);
     g.drawRoundRect(10,100,80,50,10,10);
     g.fillRoundRect(20,110,60,30,5,5);
     g.drawLine(100,10,230,140);
     g.drawLine(100,140,230,10);
<APPLET
CODE =LineRect.class
WIDTH=250
HEIGHT=200>
</APPLET>

There are many significant errors here for instance you are using a class file as if it were an applet yet you do not subclass applet. Your code has no init method (if it is to be an applet). Your best bet is to go through the tutorials one step at a time. One thing to consider is to subclass a JPanel and draw on the jpanel overriding the paintComponent method. This can then be added to a JFrame or a JApplet's contentPane and would allow the same graphics in both. But again, please study the tutorials on all of this, otherwise you will be doing hit-or-miss programming, and that is no way to learn.
Much luck!
Addendum: Also, if you are just beginning in Java programming, I suggest you start with the basics and not with Swing / AWT / graphics programming. Otherwise you will just end up bruised and disappointed. You have to learn to walk before you can run.
Edited by: Encephalopathic on Dec 26, 2007 5:09 AM

Links not working in executable jar

I have a problem with my java application
html and images files do not work in executable jar
though the application works normally
I tried some suggestion but I received an exception thread indicating problem at
ImageIcon iChing = new ImageIcon(imageURL);
Please could you help me thank you so much
here is the class
public class Main extends JFrame
* objects required for the GUI: JFrame,JLabel, JButton, ImageIcon, JPanel,
* Dimension
private static final long serialVersionUID = 1L;
JButton jbEnter;
ImageIcon iChing, logo;
JPanel buttonPanel, ImagePanel;
JLabel jlbIching;
Dimension dim;
URL imageURL;
File fileName;
// Class constructor to create the GUI
public Main()
Container container = getContentPane();
URL imageURL = this.getClass().getClassLoader().getResource("src/myFiles/iching.gif");
ImageIcon iChing = new ImageIcon(imageURL);
jlbIching = new JLabel(iChing);
// button to go to the Title class
jbEnter = new JButton("Enter ");
jbEnter.setBorderPainted(false);
jbEnter.setFont(new Font("Edwardian Script ITC", Font.BOLD, 42));
jbEnter.setBackground(new Color(0, 0, 50));
jbEnter.setForeground(Color.YELLOW);
jbEnter.addActionListener(new ActionListener() {
// method to render the current frame invisible and trigger the
// Welcome Menu
public void actionPerformed(ActionEvent e)
setVisible(false);
// this line does not work...............
new Title();
} // close the actionPerformed(ActionEvent e) Method
}); // close the addActionListener(new ActionListener() method
// Panel holding the decorative image and Button
ImagePanel = new JPanel();
ImagePanel.add(jlbIching);
ImagePanel.setBackground(new Color(0, 0, 50));
buttonPanel = new JPanel();
buttonPanel.add(jbEnter);
buttonPanel.setBackground(new Color(0, 0, 50));
// setting up of the panels position
container.add(ImagePanel, BorderLayout.CENTER);
container.add(buttonPanel, BorderLayout.SOUTH);
dim = Toolkit.getDefaultToolkit().getScreenSize();
dim.width = dim.width / 2 - 300;
dim.height = dim.height / 2 - 250;
setBounds(dim.width, dim.height, 400, 400);
setSize(600, 500);
setResizable(false);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//To set the icon for the application. Top left hand corner.
//this.setIconImage(Image);
setIconImage(new ImageIcon("src/myFiles/ichingRose.gif").getImage());
} // close the Constructor
* the main method for the program.
* @param args
* The command-line arguments.
public static void main(String[] args)
new Main();
} // close the main method
} // close the Main class

Thank you very much for your quick reply and really hope you can help me a little more
it's so frustrating
I do not really know about the relative path but here is my xml file
<?xml version="1.0" encoding="UTF-8" ?>
<project default="jar">

<target name="jar">

<mkdir dir="ant"/>
<mkdir dir="work"/>
     <mkdir dir="ant/myFiles"/

<javac
debug="yes"
destdir="ant"
source="1.6"
target="1.6">

<src path="src"/>
</javac>
     <copy todir="ant/myFiles"><fileset dir="src/myFiles"></fileset></copy>

<jar
               jarfile="work/BookOfChanges.jar"
basedir="ant"
>

<manifest>

<attribute name="Main-Class" value="iChing.Main"/>
</manifest>
</jar>
</target>
</project>

Why table getWidth and setWidth is not working when resize column the table

hi all,
i want to know why the setWidth is not working in the following code,
try to uncomment the code in columnMarginChanged method and run it wont resize the table.
i cont set width(using setWidth) of the other table column using getWidth of the main table column.
and i want to resize the right side columns only (you can check when you resize the any column the left and right side columns also resizing)
any suggestions could be helpful.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.TableColumnModelEvent;
import javax.swing.event.TableColumnModelListener;
import javax.swing.table.TableColumnModel;
public class SynTableResize extends JFrame implements TableColumnModelListener, ActionListener
    JTable table1       = new JTable(5, 5);
    JTable table2       = new JTable(5, 5);
    JTable table3       = new JTable(5, 5);
    JButton btn          = new JButton("refresh");
    JPanel pnlcontainer = new JPanel();
    public SynTableResize()
        setLayout(new BorderLayout());
        pnlcontainer.setLayout(new BoxLayout(pnlcontainer, BoxLayout.Y_AXIS));
        pnlcontainer.add(table1.getTableHeader());
        pnlcontainer.add(Box.createVerticalStrut(5));
        pnlcontainer.add(table2);
        pnlcontainer.add(Box.createVerticalStrut(5));
        pnlcontainer.add(table3);
        table2.setTableHeader(null);
        table3.setTableHeader(null);
        table1.getColumnModel().addColumnModelListener(this);
        table3.setColumnModel(table1.getColumnModel());
        table2.setColumnModel(table1.getColumnModel());
        table2.getColumnModel().addColumnModelListener(table1);
        table3.getColumnModel().addColumnModelListener(table1);
        btn.addActionListener(this);
        getContentPane().add(pnlcontainer, BorderLayout.CENTER);
        getContentPane().add(btn, BorderLayout.SOUTH);
        setSize(new Dimension(400, 400));
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    public static void main(String[] args)
        new SynTableResize();
    public void columnAdded(TableColumnModelEvent e)
    public void columnMarginChanged(ChangeEvent e)
        TableColumnModel tcm = table1.getColumnModel();
        int columns = tcm.getColumnCount();
        for (int i = 0; i < columns; i++)
            table2.getColumnModel().getColumn(i).setPreferredWidth(tcm.getColumn(i).getWidth());
            table3.getColumnModel().getColumn(i).setPreferredWidth(tcm.getColumn(i).getWidth());
            // the following commented code wont work.
//            table2.getColumnModel().getColumn(i).setPreferredWidth(tcm.getColumn(i).getPreferredWidth());
//            table3.getColumnModel().getColumn(i).setPreferredWidth(tcm.getColumn(i).getPreferredWidth());
//            table2.getColumnModel().getColumn(i).setWidth(tcm.getColumn(i).getWidth());
//            table3.getColumnModel().getColumn(i).setWidth(tcm.getColumn(i).getWidth());
        SwingUtilities.invokeLater(new Runnable()
            public void run()
                table2.revalidate();
                table3.revalidate();
    public void columnMoved(TableColumnModelEvent e)
    public void columnRemoved(TableColumnModelEvent e)
    public void columnSelectionChanged(ListSelectionEvent e)
    public void actionPerformed(ActionEvent e)
        JTable table = new JTable(5, 5);
        table.setColumnModel(table1.getColumnModel());
        table.getColumnModel().addColumnModelListener(table1);
        pnlcontainer.add(Box.createVerticalStrut(5));
        pnlcontainer.add(table);
        pnlcontainer.validate();
        pnlcontainer.repaint();
}thanks
dayananda b v

hi,
thanks for your replay,
yes i know that, you can check the following code it works fine.
actually what i want is, when i resize table column it shold not automaticaly reszie when table resized and i dont want horizontal scroll bar, meaning that all table columns should resize with in the table size(say width 300)
if i make table autoresize off than horizontal scroll bar will appear and the other columns moved and i want scroll to view other columns.
please suggest me some way doing it, i tried with doLayout() no help,
doLayout() method only can be used when table resizes. first off all i want to restrict table resizing with in the limited size
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.ChangeEvent;
import javax.swing.table.TableColumnModel;
public class TempSycnTable extends JFrame
    JTable table1       = new JTable(5, 5);
    MyTable table2       = new MyTable(5, 5);
    MyTable table3       = new MyTable(5, 5);
    JPanel pnlcontainer = new JPanel();
    public TempSycnTable()
        JScrollPane src2 = new JScrollPane(table2);
        JScrollPane src3 = new JScrollPane(table3);
//        table1.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//        table2.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//        table3.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//        src2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
//        src3.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        table2.setTableHeader(null);
        table3.setTableHeader(null);
        table3.setColumnModel(table1.getColumnModel());
        table2.setColumnModel(table1.getColumnModel());
        table2.getColumnModel().addColumnModelListener(table1);
        table3.getColumnModel().addColumnModelListener(table1);
        table2.setTableHeader(null);
        table3.setTableHeader(null);
        setLayout(new BorderLayout());
        pnlcontainer.setLayout(new BoxLayout(pnlcontainer, BoxLayout.Y_AXIS));
        pnlcontainer.add(table1.getTableHeader());
        pnlcontainer.add(Box.createVerticalStrut(5));
        pnlcontainer.add(src2);
        pnlcontainer.add(Box.createVerticalStrut(5));
        pnlcontainer.add(src3);
        getContentPane().add(pnlcontainer, BorderLayout.CENTER);
        setSize(new Dimension(300, 300));
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    public static void main(String[] args)
        new TempSycnTable();
    class MyTable extends JTable
        public MyTable()
            super();
        public MyTable(int numRows, int numColumns)
            super(numRows, numColumns);
        public void columnMarginChanged(ChangeEvent event)
            final TableColumnModel eventModel = table1.getColumnModel();
            final TableColumnModel thisModel = getColumnModel();
            final int columnCount = eventModel.getColumnCount();
            for (int i = 0; i < columnCount; i++)
                thisModel.getColumn(i).setWidth(eventModel.getColumn(i).getWidth());
            repaint();
}thanks
daya

Placing components without layout manager not working

Hey there, I am working on a java game version of pong which I have begun to try and do using Java Swing. The problem I am currently having is reposition the components in the main window part of the game which is were the user can start a new game or close the program. I having tried using the absolute positioning by setting the layout manager to null but then everything goes blank. I can't figure out why this is not working. Here is the code so far...
import javax.swing.*;
import java.awt.*;
public class SwingPractice extends JFrame
    private Container contents;
    private JLabel titleLabel;
    private JButton startGameButton;
    public SwingPractice()
        super("SwingPractice");
        contents = getContentPane();
        contents.setLayout(null);
        this.getContentPane().setBackground(Color.BLUE);
        startGameButton = new JButton("Start Game");
        startGameButton.setFont(new Font("Visitor TT1 BRK", Font.PLAIN, 24));
        startGameButton.setForeground(Color.cyan);
        startGameButton.setBackground(Color.blue);
        startGameButton.setBounds(350,350, 75, 75);
        titleLabel = new JLabel("The Amazing Ping Pong Game!!");
        titleLabel.setForeground(Color.cyan);
        titleLabel.setBackground(Color.blue);
        titleLabel.setOpaque(true);
        titleLabel.setFont(new Font("Visitor TT1 BRK", Font.PLAIN, 24));
        titleLabel.setBounds(0,350, 75, 75);
        contents.add(startGameButton);
        contents.add(titleLabel);
        setSize(700,350);
        setResizable(false);
        setVisible(true);
    /*private class SwingPracticeEvents implements ActionListener
    public static void main(String [] args)
        SwingPractice window = new SwingPractice();
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Any other critiquing would be greatly appreciated. Thank you.
Edited by: 804210 on Oct 21, 2010 1:30 PM

804210 wrote:
Hey there, I am working on a java game version of pong which I have begun to try and do using Java Swing. The problem I am currently having is reposition the components in the main window part of the game which is were the user can start a new game or close the program. I having tried using the absolute positioning by setting the layout manager to nullDon't. Ever. Never. Well, mostly.
Read the tutorial chapter about [url http://java.sun.com/docs/books/tutorial/uiswing/layout/index.html]Laying out components. It even features a section on absolute positioning - which you should skip reading, of course! :o)
And read this old Sun topic: http://forums.sun.com/thread.jspa?threadID=5411066
Edited by: jduprez on Oct 21, 2010 10:48 PM

WordWrsp not Working in JDK1.5?

Hello All
I am using JDK 1.5_03
I have a editor kind of stuff for which I have used
setLineWrap(true);for
JTextAreaHowever this is not working. This is working in 1.4.2_X versions. Has any one encountered this problem?

Using JDK1.5.0_04 on Fedora core 3 this wraps OK! Check it out on you configuration.
import java.awt.*;
import javax.swing.*;
public class Fred4 extends JFrame
    public Fred4()
        super("ZZZZZZZZZZZZZZZZ");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTextArea textArea = new JTextArea();
        textArea.setPreferredSize(new Dimension(100, 100));
        textArea.setLineWrap(true);
        getContentPane().add(textArea);
        textArea.setText("Some very very long long text text to see if it wraps");
        pack();
    public static void main(String a[])
        new Fred4().setVisible(true);
}

Applet is not working and I do not know why it is not working

I cannot figure out why my applet is not working. Can someone assist me with this problem?
Here is the code:
As you will soon find out some of those imports can be ignored.
import java.lang.Integer;
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.*;
import java.awt.Graphics.*;
import javax.swing.*;
import java.awt.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.JApplet.*;
import javax.swing.JFrame.*;
import java.applet.Applet;
import javax.swing.border.*;
import javax.swing.Spring.*;
import java.awt.geom.AffineTransform;
import java.awt.Graphics2D;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import java.math.*;
public class Test extends JApplet{
JFormattedTextField Relfield;
JFormattedTextField Relfield2;
JFormattedTextField Relfield3;
GridLayout layout = new GridLayout();
public void init() {
Double d = 0.0;
Double e = 0.0;
Relfield2 = new JFormattedTextField();
Relfield3 = new JFormattedTextField();
Relfield = new JFormattedTextField();
Relfield.setText(d + "");
Relfield2.setText(e + "");
TextFieldHandler handlers = new TextFieldHandler();
Relfield.addPropertyChangeListener(handlers);
JButton button1 = new JButton("1");
JButton button2 = new JButton("2");
button1.addActionListener(new T5C());
button2.addActionListener(new T6C());
Container c = getContentPane();
c.setLayout(layout);
c.add(Relfield);
c.add(Relfield2);
c.add(button1);
c.add(button2);
class T5C implements ActionListener
public void actionPerformed(ActionEvent e) {
Double b = (Double)(Double.parseDouble(Relfield.getText())) + 1;
Relfield.setValue(b + "");
Relfield2.setValue(b + "");
class T6C implements ActionListener
public void actionPerformed(ActionEvent e) {
Double b = (Double)(Double.parseDouble(Relfield.getText())) - 1;
Relfield.setValue(b + "");
Relfield2.setValue(b + "");
public class TextFieldHandler implements PropertyChangeListener {
public void propertyChange(PropertyChangeEvent e) {
Object source = e.getSource();
if (source == Relfield) {
Double Rel = ((Double)Relfield.getValue()).doubleValue();
Relfield.setValue(Rel);
Relfield2.setValue(Rel);
//BigDecimal myu = new BigDecimal("Relfield.getValue()");
public static void main( String[] argv ) {
        JFrame frame = new JFrame( "General Shear Mode Damper Design" );
        frame.addWindowListener( new WindowAdapter(){
            public void windowClosing( WindowEvent e ){
                System.exit( 0 );
        JApplet applet = new Test();
        frame.getContentPane().add(applet);
        applet.init();
        frame.setSize( 1020, 720);
        frame.setVisible(true);
}

The applet is not running at all and I can't figure out the error messages.
The error messages are below:
C:\Users\zite.1\Desktop>javac Test.java
C:\Users\zite.1\Desktop>java Test
Exception in thread "main" java.lang.NullPointerException
at Test$TextFieldHandler.propertyChange(Test.java:89)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at java.awt.Component.firePropertyChange(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at javax.swing.JRootPane.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at java.awt.Panel.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at javax.swing.JRootPane.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at java.awt.Window.addNotify(Unknown Source)
at java.awt.Frame.addNotify(Unknown Source)
at java.awt.Window.show(Unknown Source)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at java.awt.Window.setVisible(Unknown Source)
at Test.main(Test.java:112)

My Escape key is not working

Hi,
I am Meena.
I am doing a project using NetBeans and MS-Access.
When I run my project a internal framed named login loaded on the jdesktoppane which in JFrame.
So in the login internal frame i used two buttons one for Sign-in and another for sign out.
So I combined the Sign-in button with Enter key and Sign-out button with Escape key by the following coding.
I wrote the following coding in LoginInternalFrame->properties->enabled->advanced->Generate PreIntialization Code.
Action EscFromLogin=new AbstractAction()
public void actionPerformed(ActionEvent e)
    jButton2.doClick();
Action OkFromLogin=new AbstractAction()
    public void actionPerformed(ActionEvent e)
       jButton1.doClick();
getRootPane().getInputMap(jButton2.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE,0,false),"Esc_in_Login");
getRootPane().getActionMap().put("Esc_in_Login",EscFromLogin);
getRootPane().getInputMap(jButton1.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,0,false),"Ok_in_Login");
getRootPane().getActionMap().put("Ok_in_Login",OkFromLogin);In the above coding Enter key works well no problem.that is when I press the Enter key ,it combined with Sign-in button and works well.
But when I press Escape key,it doesnot combined with Sign-off button.
that is nothing is happening when I press Esc key.
So i change the Escape key and test with F1 then F2 then F3 all are combined with Sign-off button and works well.But only the escape key is not working.
But I have so many internal frames .In all internalframes my esc key works well.But not in the first inter frame(login internalframe)
I couldnot understand the reason.
Will you please help me to solve.
Thank you so much.
Meena

mmm, i'm doing some tests and the case is working for me... The reason F1,F2 keys works while ESC don't is that some component is "eating" the ESC key. Probably your password textField, but it is not its default behaviour. For example, try to replace the textField with a FormattedTextField, write something into it and press ESC, this first ESC is consumed by the FormattedTextField, if you press ESC a second time the FormattedTextField not consume it, so the ESC keystroke processing is given to the rest of the componentes until one of they consume it (basically). So, how can you solve th problem? Try to determine which component is the "escape-eater". Once you detected it try to determine which properties are set and if this properties can alter the keyboard mapping. The problem can be difficult to repeat for us because the look and feel, java version, etc. can affect the system behaviour too. A global hook to ESC can also be the reason (maybe esc key it's not reaching ths components), try to override ProcessKeyBindings and log the results....

Applet not Working.Why???

I have written an applet program but it does not work
It works when i did it as an application.
I have installed JAVA plug in.The HTML and Applet codes
are in the same directory as JDK
The web browser comes up with a grey area & the following messages:
Exception:java.lang.ClassNotFoundException:testing4.class
(on the grey area)
Applet testing4 not loaded (at the bottom of the browser)
Why is this so?
The code i have used are as follows:
HTML CODE
<html>
<title>LPC
</title>
<applet code="testing4.class" width=400 height=110>
</applet>
</html>APPLET PROGRAM CODE
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
//import java.lang.Object;
public class testing4 extends JApplet
{ private JTextArea display;
private JScrollPane scrollPane2;
private JButton paste;
private JPanel P2;
private File fileName;
public void init()
    paste=new JButton("paste");
    paste.setMinimumSize(new Dimension(90,20));
    paste.setPreferredSize(new Dimension(90,20));
    paste.setMaximumSize(new Dimension(90,20));
    copyhandler pa=new copyhandler();
    paste.addActionListener(pa);
    display=new JTextArea();
    scrollPane2=new JScrollPane(display);
    scrollPane2.setVerticalScrollBarPolicy(
                        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    scrollPane2.setMinimumSize(new Dimension(200,58));
    scrollPane2.setPreferredSize(new Dimension(200,58));
    scrollPane2.setMaximumSize(new Dimension(200,58));
    P2=new JPanel();
    P2.setMinimumSize(new Dimension(200,80));
    P2.setPreferredSize(new Dimension(200,80));
    P2.setMaximumSize(new Dimension(200,80));
    P2.setLayout(new BoxLayout(P2,BoxLayout.Y_AXIS));
    scrollPane2.setAlignmentX (Component.LEFT_ALIGNMENT);
    P2.add(scrollPane2);
    paste.setAlignmentX(Component.LEFT_ALIGNMENT);
    P2.add(paste);
   Container c=getContentPane();
    c.add(P2);
   //COPIES TEXT FROM FILE ON MY DISK TO THE TEXTAREA
   private class copyhandler implements ActionListener
   { public void actionPerformed(ActionEvent event)
     { JFileChooser fileChooser = new JFileChooser();
       fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY );
       int result = fileChooser.showOpenDialog(testing4.this);
       // user clicked Cancel button on dialog
       if ( result == JFileChooser.CANCEL_OPTION )
         return;
       fileName = fileChooser.getSelectedFile();
       if ( fileName == null ||
          fileName.getName().equals( "" ) )
       JOptionPane.showMessageDialog( null,"Invalid File Name",
                                        "Invalid File Name",
                                      JOptionPane.ERROR_MESSAGE );
       else
       { try
         { FileReader in = new FileReader(fileName);
           BufferedReader reading= new BufferedReader(in);
           String store="";
           while (reading.ready())
           { StringTokenizer st = new StringTokenizer(reading.readLine());
             store=store+st.nextToken()+"\n";
           display.setText(store);
         catch ( IOException e )
         { JOptionPane.showMessageDialog( null,
                                      "Error Opening File", "Error",
                                      JOptionPane.ERROR_MESSAGE );
public static void main (String [] args)
{ testing4 done =new testing4();
    JFrame frame = new JFrame("testing");
    frame.addWindowListener(new WindowAdapter()
                             public void windowClosing(WindowEvent e)
                               System.exit(0);
    done.init();
    frame.getContentPane().add(done);
    frame.pack();
    frame.setSize(205,110);
    frame.setVisible(true);
}

It Still giving a blank page.
New Code
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
//import java.lang.Object;
public class testing4 extends JApplet
{ private JTextArea display;
private JScrollPane scrollPane2;
private JButton paste;
private JPanel P2;
private File fileName;
public void init()
    paste=new JButton("paste");
    paste.setMinimumSize(new Dimension(90,20));
    paste.setPreferredSize(new Dimension(90,20));
    paste.setMaximumSize(new Dimension(90,20));
    copyhandler pa=new copyhandler();
    paste.addActionListener(pa);
    display=new JTextArea();
    scrollPane2=new JScrollPane(display);
    scrollPane2.setVerticalScrollBarPolicy(
                        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    scrollPane2.setMinimumSize(new Dimension(200,58));
    scrollPane2.setPreferredSize(new Dimension(200,58));
    scrollPane2.setMaximumSize(new Dimension(200,58));
    P2=new JPanel();
    P2.setMinimumSize(new Dimension(200,80));
    P2.setPreferredSize(new Dimension(200,80));
    P2.setMaximumSize(new Dimension(200,80));
    P2.setLayout(new BoxLayout(P2,BoxLayout.Y_AXIS));
    scrollPane2.setAlignmentX (Component.LEFT_ALIGNMENT);
    P2.add(scrollPane2);
    paste.setAlignmentX(Component.LEFT_ALIGNMENT);
    P2.add(paste);
   Container c=getContentPane();
    c.add(P2);
   //COPIES TEXT FROM FILE ON MY DISK TO THE TEXTAREA
   private class copyhandler implements ActionListener
   { public void actionPerformed(ActionEvent event)
     { JFileChooser fileChooser = new JFileChooser();
       fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY );
       int result = fileChooser.showOpenDialog(testing4.this);
       // user clicked Cancel button on dialog
       if ( result == JFileChooser.CANCEL_OPTION )
         return;
       fileName = fileChooser.getSelectedFile();
       if ( fileName == null ||
          fileName.getName().equals( "" ) )
       JOptionPane.showMessageDialog( null,"Invalid File Name",
                                        "Invalid File Name",
                                      JOptionPane.ERROR_MESSAGE );
       else
       { try
         { FileReader in = new FileReader(fileName);
           BufferedReader reading= new BufferedReader(in);
           String store="";
           while (reading.ready())
           { StringTokenizer st = new StringTokenizer(reading.readLine());
             store=store+st.nextToken()+"\n";
           display.setText(store);
         catch ( IOException e )
         { JOptionPane.showMessageDialog( null,
                                      "Error Opening File", "Error",
                                      JOptionPane.ERROR_MESSAGE );
public static void main (String [] args)
{ testing4 done =new testing4();
    //you did not set applet's width and height:
    //applet is a container too
    done.setWidth(205);
    done.setHeight(110);
    JFrame frame = new JFrame("testing");
    frame.addWindowListener(new WindowAdapter()
                              public void windowClosing(WindowEvent e)
                              { System.exit(0);
    done.init();
    frame.getContentPane().add(done);
    frame.pack();
    frame.setSize(205,110);
    frame.setVisible(true);
}

Drag & Drop of a file not working in Ubuntu & other linux

Hi All,
I am working on a project,in which it has the requirement of dragging the files
from a JList present inside a JFrame to the desktop.
First I tried to get a solution using dnd API but could not. Then i googled and i got an application which is
working perfectly in both Windows and MAC Operating systems, after I made few minor changes to suit my requirements.
Below is the URL of that application:
http://stackoverflow.com/questions/1204580/swing-application-drag-drop-to-the-desktop-folder
The problem is the same application when I executed on Ubuntu, its not working at all. I tried all available options but could not trace out the exact reason.
Can anybody help me to overcome this issue?
Thanks in advance

Hi,
With the information you provided and through some information found on google i coded an application. This application is able to do the drag and drop of an item from the Desktop to Java application on Linux Platform, but i am unble to do the viceversa by this application.
I am including the application and the URL of the information i got.
[URL Of Information Found|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4899516]
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.TransferHandler;
import javax.swing.WindowConstants;
public class DnDFrame extends JFrame implements DropTargetListener {
     private DefaultListModel listModel = new DefaultListModel();
     private DropTarget dropTarget;
     private JLabel jLabel1;
     private JScrollPane jScrollPane1;
     private JList list;
     List<File> files;
     /** Creates new form DnDFrame */
     public DnDFrame() {
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          initComponents();
          dropTarget = new DropTarget(list, this);
          list.setModel(listModel);
          list.setDragEnabled(true);
          list.setTransferHandler(new FileTransferHandler());
     @SuppressWarnings("unchecked")
     private void initComponents() {
          GridBagConstraints gridBagConstraints;
          jLabel1 = new JLabel();
          jScrollPane1 = new JScrollPane();
          list = new JList();
          setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
          getContentPane().setLayout(new GridBagLayout());
          jLabel1.setText("Files:");
          gridBagConstraints = new GridBagConstraints();
          gridBagConstraints.gridwidth = GridBagConstraints.REMAINDER;
          gridBagConstraints.anchor = GridBagConstraints.WEST;
          getContentPane().add(jLabel1, gridBagConstraints);
          jScrollPane1.setViewportView(list);
          gridBagConstraints = new GridBagConstraints();
          gridBagConstraints.gridwidth = GridBagConstraints.REMAINDER;
          gridBagConstraints.fill = GridBagConstraints.HORIZONTAL;
          getContentPane().add(jScrollPane1, gridBagConstraints);
          pack();
     public void dragEnter(DropTargetDragEvent arg0) {
     public void dragOver(DropTargetDragEvent arg0) {
     public void dropActionChanged(DropTargetDragEvent arg0) {
     public void dragExit(DropTargetEvent arg0) {
     public void drop(DropTargetDropEvent evt) {
          System.out.println(evt);
          int action = evt.getDropAction();
          evt.acceptDrop(action);
          try {
               Transferable data = evt.getTransferable();
               DataFlavor uriListFlavor = null;
               try {
                    uriListFlavor = new DataFlavor("text/uri-list;class=java.lang.String");
               } catch (ClassNotFoundException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
               System.out.println("data.isDataFlavorSupported(DataFlavor.javaFileListFlavor: " +
                         data.isDataFlavorSupported(DataFlavor.javaFileListFlavor) );
               if (data.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                    files = (List<File>) data.getTransferData(DataFlavor.javaFileListFlavor);
                    for (File file : files) {
                         listModel.addElement(file);
               }else if (data.isDataFlavorSupported(uriListFlavor)) {
                    String data1 = (String)data.getTransferData(uriListFlavor);
                    files = (List<File>) textURIListToFileList(data1);
                    for (File file : files) {
                         listModel.addElement(file);
                    System.out.println(textURIListToFileList(data1));
          } catch (UnsupportedFlavorException e) {
               e.printStackTrace();
          } catch (IOException e) {
               e.printStackTrace();
          } finally {
               evt.dropComplete(true);
     private static java.util.List textURIListToFileList(String data) {
          java.util.List list = new java.util.ArrayList(1);
          for (java.util.StringTokenizer st = new java.util.StringTokenizer(data,"\r\n");
          st.hasMoreTokens();) {
               String s = st.nextToken();
               if (s.startsWith("#")) {
                    continue;
               try {
                    java.net.URI uri = new java.net.URI(s);
                    java.io.File file = new java.io.File(uri);
                    list.add(file);
               } catch (java.net.URISyntaxException e) {
               } catch (IllegalArgumentException e) {
          return list;
     private class FileTransferHandler extends TransferHandler {
          @Override
          protected Transferable createTransferable(JComponent c) {
               JList list = (JList) c;
               List<File> files = new ArrayList<File>();
               for (Object obj: list.getSelectedValues()) {
                    files.add((File)obj);
               return new FileTransferable(files);
          @Override
          public int getSourceActions(JComponent c) {
               return COPY;
     static {
          try {
               uriListFlavor = new
               DataFlavor("text/uri-list;class=java.lang.String");
          } catch (ClassNotFoundException e) {
               e.printStackTrace();
     private class FileTransferable implements Transferable {
          private List<File> files;
          public FileTransferable(List<File> files) {
               this.files = files;
          public DataFlavor[] getTransferDataFlavors() {
               return new DataFlavor[]{DataFlavor.javaFileListFlavor,uriListFlavor};
          public boolean isDataFlavorSupported(DataFlavor flavor) {
               if(flavor.equals(DataFlavor.javaFileListFlavor) || flavor.equals(uriListFlavor))
                    return true;
               else
                    return false;
          public Object getTransferData(DataFlavor flavor) throws
          UnsupportedFlavorException, java.io.IOException {
                  if (isDataFlavorSupported(flavor) && flavor.equals(DataFlavor.javaFileListFlavor)) {
                    return files;
               }else if (isDataFlavorSupported(flavor) && flavor.equals(uriListFlavor)) {
                    java.io.File file = new java.io.File("file.txt");
                    String data = file.toURI() + "\r\n";
                    return data;
               }else {
                    throw new UnsupportedFlavorException(flavor);
     private static DataFlavor uriListFlavor;
     static {
          try {
               uriListFlavor = new
               DataFlavor("text/uri-list;class=java.lang.String");
          } catch (ClassNotFoundException e) {
               e.printStackTrace();
     public static void dumpProperty(String name) {
          System.out.println(name + " \t" + System.getProperty(name) );
     public static void main(String[] args) {
          String[] props = {
                    "java.version",
                    "java.vm.version",
                    "java.vendor",
                    "os.name",
          "os.version"};
          for (String prop : props) {
               dumpProperty(prop);
          Runnable r = new Runnable() {
               public void run() {
                    DnDFrame f = new DnDFrame();
                    f.setVisible(true);
          SwingUtilities.invokeLater(r);
}Please Suggest me in this.

ActionPerformed() not working correctly

This class, ClassExplorer, displays information on a class. Can you tell me why the actionPerformed() method of class ExplorerButton is not working?
import java.lang.reflect.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class ClassExplorer extends JFrame {
    private JPanel basicPanel = new JPanel();
    private JPanel methodPanel = new JPanel();
    private JPanel packagePanel = new JPanel();
    private JPanel innerPanel = new JPanel();
    public ClassExplorer( Class obj ) {
        setContentPane( new JTabbedPane() );
        JTabbedPane content = (JTabbedPane) getContentPane();
        content.addTab( "Basic", basicPanel );
        content.addTab( "Methods", methodPanel );
        content.addTab( "Package", packagePanel );
        String className = obj.toString();
        basicPanel.add( new JTitledLabel( "Name", className ) );
        String superclass = obj.getSuperclass().toString();
        basicPanel.add( new JTitledLabel( "Super-class", superclass ) );
        ExplorerButton superclassExplore = new ExplorerButton(
            "Explore Superclass...",
            obj.getSuperclass() );
        basicPanel.add( superclassExplore );
        String packageName = obj.getPackage().getName();
        packagePanel.add( new JTitledLabel( "Name", packageName ) );
        String packageVendor = obj.getPackage().getImplementationVendor();
        packagePanel.add( new JTitledLabel( "Vendor", packageVendor ) );
        String packageVersion = obj.getPackage().getImplementationVersion();
        packagePanel.add( new JTitledLabel( "Version", packageVersion ) );
        String packageTitle = obj.getPackage().getImplementationTitle();
        packagePanel.add( new JTitledLabel( "Title", packageVersion ) );
        pack();
        setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        setVisible( true );
    public static void main( String [] args ) {
        try {
            new ClassExplorer( Class.forName( "javax.swing.JButton" ) );
        } catch ( ClassNotFoundException cnfe ) {}
class JTitledLabel extends JLabel {
    public JTitledLabel( String title, String text ) {
        super( text, SwingConstants.RIGHT );
        setBorder( new TitledBorder( new EtchedBorder(), title,
            TitledBorder.LEFT, TitledBorder.TOP ) );
class ExplorerButton extends JButton implements ActionListener {
    private Class exploreTo;
    public void actionPerformed( ActionEvent ae ) {
        new ClassExplorer( exploreTo );
    public ExplorerButton( String text, Class c ) {
        super( text );
        exploreTo = c;
}Please ant thank you in advance.

You have not added the listener to the button.
Add a constructor to the ExplorerButton class like so...
class ExplorerButton extends JButton implements ActionListener
    private Class exploreTo;
    public ExplorerButton()
       super();
       addActionLisener(this); //THIS IS WHAT YOU ARE MISSING
    public void actionPerformed( ActionEvent ae )
        new ClassExplorer( exploreTo );
    public ExplorerButton( String text, Class c )
        super( text );
        exploreTo = c;
}This tells the class that it is listening to itself.
N35Sy

FocusListener on JFrames not working...

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