Make a JComponent focusable

Hi, I have created a control myself, which extends JComponent. But I found it is not focusable.
Actually the problem is I want to make this control listening to some keyevent but I found adding a keylistener does nothing. I read something in the api document and I think it is because my control won't be able to get focus. I tested it by adding a focuslistener and no focusevent is detected.
Please correct me if I am wrong here. If I am right, does anybody konw a solution? Thanks.

Try overriding isFocusTraversable(). By default it appears to return false;

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Hi,
Check following will helpul
http://blogs.oracle.com/jdevotnharvest/entry/how_to_programmatically_set_focus

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''philipp [[#answer-669209|said]]''
<blockquote>
ok, as a follow up i'd recommend disabling half of the addons & restarting the browser - if the problem continues disable the other half & continue until you've narrowed it down to the culprit...
</blockquote>
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Please help.

Here you are (It's Christmas time ;-) )
The following programme demonstrates a simple way of controlling the focus
sequence when navigating with the TAB and shift-TAB keys through the components
of a panel.
Here we have only four textfields (tf1-tf4) in one column and two buttons (b1,
b2) in a second column. When running the programme, the focus sequence is: tf1,
b1, tf2, tf3, b2, tf4.
But this is not really what we would like. We'd rather prefer to first fill the
textfields and then choose between two different actions. So remove the comment
slashes in
//    panel.setFocusCycleRoot(true);
//    panel.setFocusTraversalPolicy(new MyFocusTraversalPolicy());
Recompile and run, and see that the sequence is now: tf1, tf2, tf3, tf4, b1, b2
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With "panel.setFocusCycleRoot(true);" we declared our panel as the FocusCycleRoot
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in the panel: Cut the line
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and paste it after
    panel.add(b2);
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focus would move in our example also to the JLabels and the JPanel itself. So the
method makes sure that the focus rests only on components which can accept input
or fire an action.
import java.awt.*;
import javax.swing.*;
public class FocusSeqDemo
public static void main(String args[])
{ new FocusSeqDemo();
public FocusSeqDemo()
{ JFrame frame = new JFrame();
    frame.setSize (210,220);
    frame.setTitle ("FocusSeqDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container cp = frame.getContentPane();
    JPanel panel = new JPanel();
    panel.setLayout(null);
//    panel.setFocusCycleRoot(true);
//    panel.setFocusTraversalPolicy(new MyFocusTraversalPolicy());
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    JLabel l2= new JLabel("B:");
    JTextField tf1= new JTextField();
    JTextField tf2= new JTextField();
    JTextField tf3= new JTextField();
    JTextField tf4= new JTextField();
    JButton b1 = new JButton("action 1");
    JButton b2 = new JButton("action 2");
    Insets insets= new Insets(0,0,0,0);
    b1.setMargin(insets);
    b2.setMargin(insets);
    l1.setBounds(10,40,20,21);
    l2.setBounds(10,100,20,21);
    tf1.setBounds(30,40,50,21);
    tf2.setBounds(30,70,50,21);
    tf3.setBounds(30,100,50,21);
    tf4.setBounds(30,130,50,21);
    b1.setBounds(110,60,60,30);
    b2.setBounds(110,100,60,30);
    panel.add(l1);
    panel.add(l2);
    panel.add(tf1);
    panel.add(tf2);
    panel.add(tf3);
    panel.add(tf4);
    panel.add(b1);
    panel.add(b2);
    cp.add(panel, BorderLayout.CENTER);
    frame.setVisible(true);
    panel.getComponent(2).requestFocusInWindow(); // component 0 and 1 are the
//                                             labels.
class MyFocusTraversalPolicy extends ContainerOrderFocusTraversalPolicy
{ protected boolean accept(Component aComp)
    { if (aComp instanceof JTextField || aComp instanceof JButton)
                              return super.accept(aComp);
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}

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Thanks but unfortunately that didn't solve my problem...
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Make a JComponent focusable

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