Problem with focusListener

Question

Hi All,
I have created 2 text fields and added the focus listener to check user data.
EX: Whenever user leaves the text field blank progrm will alert not to leave the text field blank. Whenever I press tab to go to next text field I receive alert for both the text fields. Following is my code.
public void focusLost(FocusEvent fe1)
          Component c = fe1.getComponent();
          if(c instanceof JTextField)
               JTextField f = (JTextField) c;
               if (f.getName().equals("First Name"))
                    String s = f.getText();
                    if(s.equals(""))
          createDialog("First Name value can not be null!!",c);
                    else if(f.getName.equals("Last Name"))
                         createDialog("First Name value can not be null!!",c);
public void createDialog(String s,Component cc)
               JDialog dialog = new JDialog();
               dialog.getContentPane().setLayout(new BoxLayout(dialog.getContentPane(),BoxLayout.Y_AXIS));
               dialog.setSize(210,100);
               JLabel message = new JLabel(s);
               JButton b = new JButton("Ok");
               dialog.getContentPane().add(message);
               dialog.getContentPane().add(b);
               dialog.setVisible(true);
               dialog.setLocationRelativeTo(cc);
               dialog.show();
Please help!!
Thanks

Answer 1

Hello again,
using now a flag to prevent focus problem:import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Test extends JFrame implements FocusListener
     public static void main(String[] args)
          new Test();
     private JTextField t1 = null;
     private JTextField t2 = null;
     boolean eventChecked = false;
     public Test()
          super();
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          initPanel();
          pack();
          setLocationRelativeTo(null);
          setVisible(true);
     private void initPanel()
          t1 = new JTextField(10);
          t1.setName("FirstName");
          t2 = new JTextField(10);
          t2.setName("LastName");
          t1.addFocusListener(this);
          t2.addFocusListener(this);
          getContentPane().add(t1, BorderLayout.NORTH);
          getContentPane().add(t2, BorderLayout.SOUTH);
     public void focusLost(FocusEvent fe1)
          if (eventChecked)
               return;
          Component c = fe1.getComponent();
          if (c instanceof JTextField)
               JTextField f = (JTextField) c;
               String s = f.getText();
               if (f.getName().equals("FirstName") && s.equals(""))
                    createDialog("First Name value can not be null!!", c);
                    eventChecked = true;
                    f.requestFocusInWindow();
               else if (f.getName().equals("LastName") && s.equals(""))
                    createDialog("Last Name value can not be null!!", c);
                    eventChecked = true;
                    f.requestFocusInWindow();
     public void focusGained(FocusEvent e)
     public void createDialog(String s, Component cc)
          final JDialog dialog = new JDialog();
          dialog.getContentPane().setLayout(new BoxLayout(dialog.getContentPane(), BoxLayout.Y_AXIS));
          dialog.setSize(210, 100);
          JLabel message = new JLabel(s);
          JButton b = new JButton("Ok");
          dialog.getContentPane().add(message);
          dialog.getContentPane().add(b);
          dialog.setLocationRelativeTo(cc);
          dialog.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
          dialog.addWindowListener(new WindowAdapter()
               public void windowClosing(WindowEvent e)
                    eventChecked = false;
                    dialog.hide();
          dialog.setVisible(true);
}regards,
Tim