[JList] impossible d'avoir les valeurs

salut,

impossible d'avoir les valeur que je selectionne a la souris ou avec les fleches directionnelles l'element selectionner d'une jlist, chaque fois que je clique sur un element j'ai toujours une valeur null. je precise aussi que je developpe avec l'ihm integrée de netbean

1) j'ai creer une variable nommé model1 de la clase DefaultListModel();
j'ai initialiser model1 par Jlist.setModel(model1);
et par jList jList1= JList(model1);

les informations que j'ai introduit dans le model1 est un vecteur
voici l'initialisation de model1 :

Code:

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private void conversionmodel(Vector vector){ int i; for(i=0;i<vector.size();i++) model1.addElement(vector.elementAt(i)); }

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la methode que j'utilise pour prendre une valeur selectionner :

Code:

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private void jList1ValueChanged(javax.swing.event.ListSelectionEvent evt) { // TODO add your handli       if(jList1.getSelectedValue()==null) { JOptionPane.showMessageDialog(null,"pas de categorie"," ",JOptionPane.ERROR_MESSAGE ); } else{ jTextField1.setText((String) jList1.getSelectedValue()); } }

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le probleme est que j'ai toujour une valeur null quelque sois ma selection
j'utilise la methode valuechanged

mon code complet :

Code:

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/*  * To change this template, choose Tools | Templates  * and open the template in the editor.  */   /*  * IsousCategorie.java  *  * Created on 24 mai 2009, 21:18:06  */   package com.java.ihm;   import java.sql.SQLException; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.DefaultListModel; import com.mysql.source.*; import java.util.Vector; import javax.swing.JList; import javax.swing.JOptionPane; import javax.swing.JScrollPane; /**  *  * @author modde  */ public class IsousCategorie extends javax.swing.JFrame {       private String nomcategorie=""; private DirectiveMysql directivemysql=new DirectiveMysql(); private DefaultListModel model1 =new DefaultListModel(); private DefaultListModel model2 =new DefaultListModel(); /** Creates new form IsousCategorie */ public IsousCategorie() throws SQLException { initComponents(); directivemysql.setPassword(Attribution.password); directivemysql.setPseudo(Attribution.pseudo); //directivemysql.connectionMysql(); conversionmodel(directivemysql.afficheCategorie()); jList1=new JList(model1); jScrollPane1 =new JScrollPane(jList1); } private void conversionmodel(Vector vector){ int i; for(i=0;i<vector.size();i++) model1.addElement(vector.elementAt(i)); } /** This method is called from within the constructor to      * initialize the form.      * WARNING: Do NOT modify this code. The content of this method is      * always regenerated by the Form Editor.      */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { bindingGroup = new org.jdesktop.beansbinding.BindingGroup();   jLabel1 = new javax.swing.JLabel(); jTextField1 = new javax.swing.JTextField(); jScrollPane1 = new javax.swing.JScrollPane(); jList1 = new javax.swing.JList(); jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); jTextField2 = new javax.swing.JTextField(); jScrollPane2 = new javax.swing.JScrollPane(); jList2 = new javax.swing.JList(); jLabel4 = new javax.swing.JLabel(); jButton1 = new javax.swing.JButton(); jButton2 = new javax.swing.JButton(); jLabel5 = new javax.swing.JLabel(); jButton3 = new javax.swing.JButton();   setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);   jLabel1.setText("ISousCategorie");   jTextField1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jTextField1ActionPerformed(evt); } });   jList1.setModel(model1);   org.jdesktop.beansbinding.Binding binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, jList1, org.jdesktop.beansbinding.ELProperty.create("${selectedValue}"), jList1, org.jdesktop.beansbinding.BeanProperty.create("selectedElement")); bindingGroup.addBinding(binding);   jList1.addListSelectionListener(new javax.swing.event.ListSelectionListener() { public void valueChanged(javax.swing.event.ListSelectionEvent evt) { jList1ValueChanged(evt); } }); jScrollPane1.setViewportView(jList1);   jLabel2.setText("Categorie choisie :");   jLabel3.setText("Creation d'une sous categorie :");   jList2.setModel(model2); jScrollPane2.setViewportView(jList2);   jLabel4.setText("Refresh");   jButton1.setText("Valider");   jButton2.setText("Effacer");   jLabel5.setText("Nom Sous Categorie :");   jButton3.setText("Effacer");   org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(layout.createSequentialGroup() .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(layout.createSequentialGroup() .add(32, 32, 32) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(jLabel2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 167, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING, false) .add(org.jdesktop.layout.GroupLayout.LEADING, jTextField1) .add(org.jdesktop.layout.GroupLayout.LEADING, jScrollPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 103, Short.MAX_VALUE))) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(layout.createSequentialGroup() .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(layout.createSequentialGroup() .add(12, 12, 12) .add(jButton2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING, false) .add(org.jdesktop.layout.GroupLayout.LEADING, jButton3, 0, 0, Short.MAX_VALUE) .add(org.jdesktop.layout.GroupLayout.LEADING, jButton1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .add(org.jdesktop.layout.GroupLayout.LEADING, jLabel4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 63, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))) .add(jLabel5)) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING, false) .add(org.jdesktop.layout.GroupLayout.LEADING, jTextField2) .add(org.jdesktop.layout.GroupLayout.LEADING, jScrollPane2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 100, Short.MAX_VALUE)) .add(300, 300, 300)) .add(jLabel3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 362, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))) .add(layout.createSequentialGroup() .add(215, 215, 215) .add(jLabel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 149, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(layout.createSequentialGroup() .addContainerGap() .add(jLabel1) .add(33, 33, 33) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) .add(jLabel2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 21, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .add(jLabel3)) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .add(jLabel5) .add(jTextField2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING, false) .add(org.jdesktop.layout.GroupLayout.LEADING, jScrollPane1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 104, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .add(layout.createSequentialGroup() .add(jLabel4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 33, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED) .add(jButton3) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) .add(jButton2) .add(jButton1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 25, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))) .add(jScrollPane2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 100, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)) .addContainerGap(84, Short.MAX_VALUE)) );   bindingGroup.bind();   pack(); }// </editor-fold>   private void jList1ValueChanged(javax.swing.event.ListSelectionEvent evt) { // TODO add your handli       if(jList1.getSelectedValue()==null) { JOptionPane.showMessageDialog(null,"pas de categorie"," ",JOptionPane.ERROR_MESSAGE ); } else{ jTextField1.setText((String) jList1.getSelectedValue()); } } private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: }   /**     * @param args the command line arguments     */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { try { new IsousCategorie().setVisible(true); } catch (SQLException ex) { Logger.getLogger(IsousCategorie.class.getName()).log(Level.SEVERE, null, ex); } } }); }   // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JButton jButton3; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JLabel jLabel4; private javax.swing.JLabel jLabel5; private javax.swing.JList jList1; private javax.swing.JList jList2; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JScrollPane jScrollPane2; private javax.swing.JTextField jTextField1; private javax.swing.JTextField jTextField2; private org.jdesktop.beansbinding.BindingGroup bindingGroup; // End of variables declaration   }

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merci d'avance !

pourtant j'ai bien une liste qui s'affiche , j'ai testé pour voir si les element sont bien inserer
dans le model, il y a pas de probleme, tous les element s'affiche.

c'est comme si ma Jlist ne voyait aucun element pourtant elle m'affiche bien la liste.

help help !
quelle galere netbean !

Déjà tu instancie deux fois ta liste, dans le initialize component et dans ton constructeur, de meme pour le modèle.
Cependant, je ne pense pas que ca vienne de là.
J'ai vus que tu utilisais du binding, ca ne viendrait pas de là ?

Dans ta méthode jList1ValueChanged, tu oublies de faire :

Code:

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private void jList1ValueChanged(javax.swing.event.ListSelectionEvent evt) { if (!evt.getValueIsAdjusting()) { // le test ici } }

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Car le listener est toujours appeler avant de sélectionner l'element pour ajustement.