Problem refreshing when using GridBagLayout for a JPanel

Question

Well, i have a JPanel which use the GridBagLayout to layout the components. If i remove a component everything it's ok, i mean it disappear from the panel, but the appears when i want to add a component. It doesn't show me the new component. Any sugestion?

Answer 1

Here is the all code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test {
     private JFrame f;
     private final JPanel detalii = new JPanel();
     private String[] sir1 = { "1820620160027", "Bradescu", "M", "Marius-Catalin", "Rovine bl. I29", "0745035150" };
     private String[] sir2 = { "1820620160031", "Bercea", "C", "Florin Bogdan", "Brazda bl. I29", "0745035150" };
     public Test(){
          f = new JFrame( "Test" );
          detalii.setLayout( new GridBagLayout() );
          detalii.setPreferredSize( new Dimension( 450, 400) );
          creazaDetaliiElev( sir2 );
          f.addMouseListener( new MouseAdapter(){
               public void mouseClicked( MouseEvent evt ){
                    if( evt.getButton() == 1){
                         creazaDetaliiElev( sir1 );
                         //detalii.invalidate();
                         f.repaint();
                    } else {
                         creazaDetaliiElev( sir2 );
                         //detalii.invalidate();
                         f.repaint();
          f.getContentPane().add( detalii );
          f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
          f.pack();
          f.setVisible( true );
     protected void creazaDetaliiElev( String[] elev ){
          if( detalii.getComponentCount() == 0 ){                    
               GridBagConstraints c = new GridBagConstraints();
               c.fill = GridBagConstraints.VERTICAL;
               JLabel lblID = new JLabel( "CNP:");
               c.anchor = GridBagConstraints.WEST;
               c.insets = new Insets( 5, 5, 5, 5 );
               c.gridx = 0;
               c.gridy = 0;
               detalii.add( lblID, c );
               JLabel lblNume = new JLabel( "Nume:" );
               c.gridx = 0;
               c.gridy = 1;
               detalii.add( lblNume, c );
               JLabel lblInitiala = new JLabel( "Initiala:" );
               c.gridx = 0;
               c.gridy = 2;
               detalii.add( lblInitiala, c );
               JLabel lblPrenume = new JLabel( "Prenume:" );
               c.gridx = 0;
               c.gridy = 3;
               detalii.add( lblPrenume, c );
               JLabel lblAdresa = new JLabel( "Adresa" );
               c.gridx = 0;
               c.gridy = 4;
               detalii.add( lblAdresa, c );
               JLabel lblTelefon = new JLabel( "Telefon:" );
               c.gridx = 0;
               c.gridy = 5;
               detalii.add( lblTelefon, c );
               JTextField txtID = new JTextField( String.valueOf( elev[ 0 ] ) );
               txtID.setBackground( Color.WHITE );
               txtID.setHorizontalAlignment( JTextField.TRAILING );
               txtID.setEditable( false );
               c.gridx = 1;
               c.gridy = 0;
               detalii.add( txtID, c );
               JTextField txtNume = new JTextField( elev[ 1 ] );
               txtNume.setBackground( Color.WHITE );
               txtNume.setHorizontalAlignment( JTextField.LEADING );
               txtNume.setEditable( false );
               c.gridx = 1;
               c.gridy = 1;
               detalii.add( txtNume, c );
               JTextField txtInitiala = new JTextField( elev[ 2 ] );
               txtInitiala.setBackground( Color.WHITE );
               txtInitiala.setHorizontalAlignment( JTextField.CENTER );
               txtInitiala.setEditable( false );
               c.gridx = 1;
               c.gridy = 2;
               detalii.add( txtInitiala, c );
               JTextField txtPrenume = new JTextField( elev[ 3 ] );
               txtPrenume.setBackground( Color.WHITE );
               txtPrenume.setHorizontalAlignment( JTextField.LEADING );
               txtPrenume.setEditable( false );
               c.gridx = 1;
               c.gridy = 3;
               detalii.add( txtPrenume, c );
               JTextField txtAdresa = new JTextField( elev[ 4 ] );
               txtAdresa.setBackground( Color.WHITE );
               txtAdresa.setHorizontalAlignment( JTextField.LEADING );
               txtAdresa.setEditable( false );
               c.gridx = 1;
               c.gridy = 4;
               detalii.add( txtAdresa, c );
               JTextField txtTelefon = new JTextField( elev[ 5 ] );
               txtTelefon.setBackground( Color.WHITE );
               txtTelefon.setHorizontalAlignment( JTextField.TRAILING );
               txtTelefon.setEditable( false );
               c.gridx = 1;
               c.gridy = 5;
               detalii.add( txtTelefon, c );
          } else {
               detalii.removeAll();
     public static void main( String[] args ){
          new Test();
, but nothing, as you see i use invalidate() too.