Help!About HotKeys

Question

I need help!!
Now, i want to make an application with several hotKeys in JFrame.My source like this:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.util.*;
public class Demo extends JFrame {
public Demo () {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
private void jbInit() throws Exception {
this.enableEvents(AWTEvent.KEY_EVENT_MASK);
getContentPane().setLayout(null);
closeBtt.setBounds(new Rectangle(0, 13, 19, 40));
closeBtt.setBorder(new TitledBorder(""));
closeBtt.setHorizontalAlignment(SwingConstants.LEFT);
closeBtt.setHorizontalTextPosition(SwingConstants.LEFT);
closeBtt.setMargin(new Insets(0, 0, 0, 0));
closeBtt.setMnemonic('0');
closeBtt.setText("X");
closeBtt.setVerticalAlignment(SwingConstants.TOP);
closeBtt.setVerticalTextPosition(SwingConstants.TOP);
this.setEnabled(true);
templateLab.setText("template");
templateLab.setBounds(new Rectangle(23, 25, 80, 17));
templateCB.setBounds(new Rectangle(103, 23, 109, 21));
codeLab.setText("name");
codeLab.setBounds(new Rectangle(225, 26, 33, 17));
codeTxt.setBounds(new Rectangle(266, 23, 63, 21));
setBtt.setBounds(new Rectangle(340, 20, 79, 27));
setBtt.setBorder(new TitledBorder(""));
setBtt.setText("set");
getContentPane().add(templateCB, null);
getContentPane().add(codeTxt, null);
getContentPane().add(setBtt, null);
getContentPane().add(closeBtt, null);
getContentPane().add(templateLab, null);
this.getContentPane().add(codeLab, null);
protected void processKeyEvent(KeyEvent evt) {
super.processKeyEvent(evt);
if(evt.getKeyCode() == KeyEvent.VK_F4){
System.out.println("AAAA");
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch(Exception e) {
Demo demo = new Demo();
demo.setBounds(50,50,479, 80);
demo.show();
private JButton closeBtt = new JButton();
private JLabel templateLab = new JLabel();
private JComboBox templateCB = new JComboBox();
private JLabel codeLab = new JLabel();
private JTextField codeTxt = new JTextField();
private JButton setBtt = new JButton();
when i clicked the F4 button, i can not catch the KeyEvent. "AAAA" is not printed.
What problem with my program?
help me, plz
thank u
BTW, if i remove all the components from JFrame except label, "AAAA" will be printed.
i used JDK1.4.0,JDK1.4.01 and JDK1.4.1beta, all are no response, but jdk1.3.1 can run my demo.
Now, i must use jdk1.4.0 or more higher version.how can i resolve it?

Answer 1

Personally I'd recommend throwing away JBuilder's UI builder for a start - these things usually they generate appalling code!
The code you've got seems to use the AWT inheritance event model that was abandoned around JDK1.1, being replaced by the delegation model.
Anyway, I'd advise doing this by registering a keyboard action with your JFrame:
ActionListener hotKeyAction = new ActionListener()
  public void actionPerformed(ActionEvent e)
    System.out.println("AAAA");
getRootPane().registerKeyboardAction(hotKeyAction, KeyStroke.getKeyStroke("F4"), WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);Hope this helps.