How to add a KeyListener to a JInternalFrame

Question

1). I have Main Window which is an Application window and has a menu. When I click on a menu option,
a user interface which is a JInternalFrame type, with JTextFields in it, is loaded.
2). In the first JTextField(e.g. Employee Number), I have a KeyListener added to the JInternalFrame.
3). When I enter an Employee number in the JTextField and press the Key F10, I have to fetch the details about the Employee
(his first name, middle name, last name etc.) from the database and display these details in the corresponding
JTextFields in the user interface.
PROBLEM:
I am able to add a KeyListener to the JInternalFrame but it does not work the way I need it to.
The moment F10 key is pressed, the JInternalFrame looses focus, and the focus goes to the Main Window and does not execute
the code for the keyPressed event that is there in the listener.
How do I overcome this issue??
The code that I am using is below
public class TD {
public void invoke(){
cFrame = new JInternalFrame("TD Form",
false, //resizable
true, //closable
true, //maximizable
true);//iconifiable
// More code here..................
//Destroy the TD Window.
cFrame.addInternalFrameListener(new InternalFrameAdapter() {
     public void internalFrameClosing(InternalFrameEvent evt){
               cancelSteps();
}); // end of InternalFrameListener.
cFrame.addKeyListener(new KeyTD(this)); // Adding the KeyListener here to the JInternalFrame
cFrame.setVisible(true);
cFrame.setSize(800,450);
cFrame.setLocation(10,10);
} // end of the constructor.
// Inner class that implements the KeyListener
class KeyTD implements KeyListener {
private int msg =JOptionPane.INFORMATION_MESSAGE;
private String title = "KeyPress Event Message";
Container cornbut;
TD objTD;
private int UTNum;
public KeyTD(TD objTD){
          this.objTD = objTD;
public void keyPressed(KeyEvent ke){
int key1 = ke.getKeyCode();
switch(key1){
case KeyEvent.VK_F9:
tD_F9();
break;
case KeyEvent.VK_F10:
UTNum = getNum(); // Reads the content of the JTextField and gets the Integer value
if (UTNum > 0){
                    tD_F10();
}else{
JOptionPane.showMessageDialog(cornbut," Please enter the Number. ",title,msg);
break;
}//end of keyPressed method
public void keyReleased(KeyEvent ke){
public void keyTyped(KeyEvent ke){
public void tD_F9(){
//sets focus to the Text Field where the key listener has been added
}//end of tD_F9 method
public void tD_F10(){
String str = String.valueOf(UTNum);
Objdbdef.fetchTaskDefiner(str,"", "","" ,"" ,"" ,"" ,"" ,"" ,"" ,"" ,"" ,"" );
if(//there are records in the database then){                       
// If there are records matching the number from the JTextField the display statements are here.........
}else{
JOptionPane.showMessageDialog(cornbut,"There are no records found for the specified criteria.",title,msg);
}//end of td_F10 method
}// end of KeyTD class

Answer 1

As a rule of thumb, I never use KeyListeners, unless you want to listen to many different key strokes.
Instead, use ActionMap/InputMap. You can attach an action to, say your desktop, that
is activated when F1 is pressed WHEN_ANCESTOR_OF_FOCUSED_COMPONENT or
WHEN_IN_FOCUSED_WINDOW