Which key is pressed

what is the best way to khow which key off keyboard is presses?
regards
esmat.

There is no native functionality in forms to do this - but if you are web deployed you can write a PJC to provide this information - see the KeyFilter sample available for Download from the Forms samples pages on OTN

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Getting which key is pressed without adding keylistener

I need to get which key is being currently pressed in valuechanged of treeselection event. i need to know which key is pressed before executing the code for treeselection event

1. In the future, note there is a Swing forum exactly for questions like this, questions about Swing:
http://forum.java.sun.com/forum.jspa?forumID=57
2. Can you explain your problem better?
Demo:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class KeyEventExample implements Runnable, KeyListener, TreeSelectionListener {
    @Override public void run() {
        JTree tree = new JTree();
        tree.addKeyListener(this);
        tree.addTreeSelectionListener(this);
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        f.getContentPane().add(new JScrollPane(tree));
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        f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
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        System.out.println("keyPressed " + evt.getKeyCode());
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        System.out.println("keyReleased " + evt.getKeyCode());
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}

How can i know which key i pressed?

i defined F9,F10 as previous Item using Oracle Terminal.after the programme is executed,the user can use the function of Previous item,how can i know the key user pressed is F2 or F3?

What's the big deal having more than one key to perform the same task? I don't believe I understood you properly....
For instance, if you don't want end-users to press Ctrl+K to invoke LOV, one option is to "disable" this key combination using Oracle Terminal.
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How to find out which keys are pressed while a d&d drop occurs?

Hi,
while an item is dropped as part of a drag and drop operation, I would like to know if the user has pressed any keys.
I use a TransferHandler for managing the d&d and this works fine with the system dependent modifier keys for move, copy and link. But as my application needs to perform special actions if, for example, 'p' is pressed while a drop occurs, I'm stuck:
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Norb

Hi,
the question is where the focus would be - because as you know unless there is a record in InputMap and keys are usually only received by focused component anyway. I'd recommend hooking into Swing event queue, something like that:
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I am supporting a legacy application for Sabre which maps some of the keys differently. For example, on a French keyboard the Compose key which is used to put a ^ on top of the vowel characters is to be remapped to produce a special character called a "Change Character" that has a special use for reservation agents that use Sabre
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I have no fix for this problem because there is no key event produced when they press the ^ compose key the first time.
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http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html
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Gah. So It looks like the first version of the song on your iPod is the definitive version of a song (as is the case in iTunes). So in order to ensure that the version you want plays, you have to:
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2. update Genius
3. sync your iPod
BOO. Too much work (I'm still going to do it though...)
I would really like a feature that allowed you to specify which song would be chosen (the existing rating system would seem to be easiest).
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1. Create an directory structure at the root of your library that would prioritize tracks, such as:
a) Albums (for full length albums)
b) Collections (for best ofs etc.)
c) EPs (for singles or remix albums)
e) Live Performances
-assuming you prefer album versions over remixes over live versions, or more directly:
a) High Priority
b) Low Priority
2. Place Each Album or individual tracks in their appropriate folder.
3. Reset your iPod
4. Sync
The directory structure will intrinsically place higher priority versions on you iPod first, making them a priority version there. Pain in the...

Default button being clicked multiple times when enter key is pressed

Hello,
There seems to be a strange difference in how the default button behaves in JRE 1.4.X versus 1.3.X.
In 1.3.X, when the enter key was pressed, the default button would be "pressed down" when the key was pressed, but wouldn't be fully clicked until the enter key was released. This means that only one event would be fired, even if the enter key was held down for a long time.
In 1.4.X however, if the enter key is pressed and held for more than a second, then the default button is clicked multiple times until the enter key is released.
Consider the following code (which is just a dialog with a button on it):
public class SimpleDialog extends JDialog implements java.awt.event.ActionListener
private JButton jButton1 = new JButton("button");
public SimpleDialog()
this.getContentPane().add(jButton1);
this.getRootPane().setDefaultButton(jButton1);
jButton1.addActionListener(this);
this.pack();
public void actionPerformed(ActionEvent e)
if (e.getSource() == jButton1)
System.out.println("button pressed");
public static void main(String[] args)
new SimpleDialog().show();
When you compile and run this code under 1.3.1, and hold the enter key down for 10 seconds, you will only see one print line statement.
However, if you compile and run this code under 1.4.1, and then hold the enter key down for 10 seconds, you will see about 100 print line statements.
Is this a bug in 1.4.X or was this desired functionality (e.g. was it fixing some other bug)?
Does anyone know how I can make it behave the "old way" (when the default button was only clicked once)?
Thanks in advance if you have any advice.
Dave

Hello all,
I think I have found a solution. The behaviour of the how the default button is triggered is contained withing the RootPaneUI. So, if I override the default RootPaneUI used by the UIDefaults with my own RootPaneUI, I can define that behaviour for myself.
Here is my simple dialog with a button and a textfield (when the focus is NOT on the button, and the enter key is pressed, I don't want the actionPerformed method to be called until the enter key is released):
package focustests;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
public class SimpleDialog extends JDialog implements java.awt.event.ActionListener
private JButton jButton1 = new JButton("button");
public SimpleDialog()
this.getContentPane().add(new JTextField("a text field"), BorderLayout.NORTH);
this.getContentPane().add(jButton1, BorderLayout.SOUTH);
this.getRootPane().setDefaultButton(jButton1);
jButton1.addActionListener(this);
this.pack();
public void actionPerformed(ActionEvent e)
if (e.getSource() == jButton1)
System.out.println("button pressed");
public static void main(String[] args)
javax.swing.UIManager.getDefaults().put("RootPaneUI", "focustests.MyRootPaneUI");
new SimpleDialog().show();
and the MyRootPaneUI class controls the behaviour for how the default button is handled:
package focustests;
import javax.swing.*;
* Since we are using the Windows look and feel in our product, we should extend from the
* Windows laf RootPaneUI
public class MyRootPaneUI extends com.sun.java.swing.plaf.windows.WindowsRootPaneUI
private final static MyRootPaneUI myRootPaneUI = new MyRootPaneUI();
public static javax.swing.plaf.ComponentUI createUI(JComponent c) {
return myRootPaneUI;
protected void installKeyboardActions(JRootPane root) {
super.installKeyboardActions(root);
InputMap km = SwingUtilities.getUIInputMap(root,
JComponent.WHEN_IN_FOCUSED_WINDOW);
if (km == null) {
km = new javax.swing.plaf.InputMapUIResource();
SwingUtilities.replaceUIInputMap(root,
JComponent.WHEN_IN_FOCUSED_WINDOW, km);
//when the Enter key is pressed (with no modifiers), trigger a "pressed" event
km.put(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_ENTER,
0, false), "pressed");
//when the Enter key is released (with no modifiers), trigger a "release" event
km.put(KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_ENTER,
0, true), "released");
ActionMap am = SwingUtilities.getUIActionMap(root);
if (am == null) {
am = new javax.swing.plaf.ActionMapUIResource();
SwingUtilities.replaceUIActionMap(root, am);
am.put("press", new HoldDefaultButtonAction(root, true));
am.put("release", new HoldDefaultButtonAction(root, false));
* This is a copy of the static nested class DefaultAction which was
* contained in the JRootPane class in Java 1.3.1. Since we are
* using Java 1.4.1, and we don't like the way the new JRE handles
* the default button, we will replace it with the old (1.3.1) way of
* doing things.
static class HoldDefaultButtonAction extends AbstractAction {
JRootPane root;
boolean press;
HoldDefaultButtonAction(JRootPane root, boolean press) {
this.root = root;
this.press = press;
public void actionPerformed(java.awt.event.ActionEvent e) {
JButton owner = root.getDefaultButton();
if (owner != null && SwingUtilities.getRootPane(owner) == root) {
ButtonModel model = owner.getModel();
if (press) {
model.setArmed(true);
model.setPressed(true);
} else {
model.setPressed(false);
public boolean isEnabled() {
JButton owner = root.getDefaultButton();
return (owner != null && owner.getModel().isEnabled());
This seems to work. Does anyone have any comments on this solution?
Tjacobs, I still don't see how adding a key listeners or overriding the processKeyEvent method on my button would help. The button won't receive the key event unless the focus is on the button. There is no method "enableEvents(...)" in the AWTEventMulticaster. Perhaps you have some code examples? Thanks anyway for your help.
Dave

Which key is pressed

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