How to capture the event on changing focus from a JTextField?

Question

Hi All,
I have got a problem...
I want to do something (say some sort of validations/calculations) when I change the focus by pressing tab from a JTextField. But I am not able to do that.
I tried with DocumentListener (jtf01.getDocument().addDocumentListener(this);). But in that case, it's calling the event everytime I ke-in something in the text field. But that's not what I want. I want to call that event only once, after the value is changed (user can paste a value, or even can key-in).
Is there any way for this? Is there any method (like onChange() in javascript) that can do this.
Please Help me...
Regards,
Ujjal

Answer 1

Hi Michael,
I am attaching my code. Actual code is very large containing 'n' number of components and ActionListeners. I am attaching only the relevant part.
//more codes
public class PaintSplitDisplay extends JApplet implements ActionListener
     JFrame jf01;
     JPanel jp01;
     JTextField jtf01, jtf02;
     //more codes
     public void start()
          //more codes
         jtf01 = new JTextField();
          jtf01.setPreferredSize(longField);
          jtf01.setFont(new Font("Courier new",0,12));
          jtf01.setInputVerifier(new InputVerifier(){public boolean verify(JComponent input)
               //more codes
               System.out.print("updating");
               jtf02.setText("updated value");
               System.out.print("updated");
               return true;
          //more codes
          jtf02 = new JTextField();
          jtf02.setPreferredSize(mediumField);
          jtf02.setEditable(false);
          jp01.add(jtf02, gbc);
          //more codes
          jf01.add(jp01);
          jf01.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          jf01.setVisible(true);
          //more codes
     public static void main(String args[])
          PaintSplitDisplay psp = new PaintSplitDisplay();
          psp.start();
     public void actionPerformed(ActionEvent ae)
          //more codes
}As you can see I want to update the second JTextField based on some calculations. That should happen when I change the focus from my frist JTextField. I have called jtf02.setText() method inside InputVerifier. But it's giving error...
Please suggest...
Ujjal