Bonsoir a tous;
je veux chargé le contenue du jliste dans un textarea ,j'ai utilisé StringBuffer et rien ne se passe
ca c'est mon code:
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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package inerface;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

/**
 * <p>Titre : </p>
 * <p>Description : </p>
 * <p>Copyright : Copyright (c) 2008</p>
 * <p>Société : </p>
 * @author non attribuable
 * @version 1.0
 */

public class Cadre3 extends JFrame {
  JPanel contentPane;
  Border border1;
  TitledBorder titledBorder1;
  JLabel jLabel3 = new JLabel();
  JLabel jLabel4 = new JLabel();
  public JTextField libellé = new JTextField();
  JPanel jPanel2 = new JPanel();
  Border border2;
  Border border3;
  Border border4;
  TitledBorder titledBorder2;
  Border border5;
  JLabel jLabel5 = new JLabel();
  JLabel jLabel6 = new JLabel();
  JLabel jLabel7 = new JLabel();
  public JList jList1 = new JList();
  JScrollPane jScrollPane1 = new JScrollPane();
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();
  JScrollPane jScrollPane2 = new JScrollPane();
  JLabel jLabel9 = new JLabel();
   public DefaultListModel modellist1 = new DefaultListModel();
   public DefaultListModel modellist2 = new DefaultListModel();
   public DefaultListModel modellist3 = new DefaultListModel();
   public JList jList2 = new JList();
  JScrollPane jScrollPane3 = new JScrollPane();
  public JList jList3 = new JList();
  JLabel jLabel10 = new JLabel();
  public JTextArea txtAreaCadre2 = null;
  JPopupMenu jPopupMenu1 = new JPopupMenu();
  JMenuItem jMenuItem1 = new JMenuItem();
  JMenuItem jMenuItem2 = new JMenuItem();
  JMenuItem jMenuItem3 = new JMenuItem();
  JMenuItem jMenuItem4 = new JMenuItem();
  JMenuItem jMenuItem5 = new JMenuItem();
  JMenuItem jMenuItem6 = new JMenuItem();
  JMenuItem jMenuItem7 = new JMenuItem();
  JMenuItem jMenuItem8 = new JMenuItem();
  JMenuItem jMenuItem9 = new JMenuItem();
  JPopupMenu jPopupMenu2 = new JPopupMenu();
  JPopupMenu jPopupMenu3 = new JPopupMenu();
  List model;
  JComboBox jComboBox1 = new JComboBox();
  private final static String newline = "\n";

  //Construire le cadre
  public Cadre3() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
          }
    Dimension d= Toolkit.getDefaultToolkit().getScreenSize();
       this.setSize(d );
  }
  /////////////////
  public Cadre3(JTextArea txt) {
    this();
    txtAreaCadre2 = txt;
  }
////////////////////
  public Cadre3(Cadre2 c1) {
      this();
      cc1=c1;
}

    Cadre2 cc1;
  JMenuItem jMenuItem10 = new JMenuItem();
  JMenuItem jMenuItem11 = new JMenuItem();
  JMenuItem jMenuItem12 = new JMenuItem();
  //Initialiser le composant
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    border1 = BorderFactory.createEtchedBorder(Color.white,new Color(178, 178, 178));
    titledBorder1 = new TitledBorder(BorderFactory.createLineBorder(Color.blue,1),"Identification de la classe");
    border2 = BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.blue,1),BorderFactory.createEmptyBorder(2,2,2,2));
    border3 = BorderFactory.createCompoundBorder(titledBorder1,BorderFactory.createEmptyBorder(2,2,2,2));
    border4 = BorderFactory.createLineBorder(Color.blue,1);
    titledBorder2 = new TitledBorder(border4,"Création des menbres de la classe");
    border5 = BorderFactory.createCompoundBorder(titledBorder2,BorderFactory.createEmptyBorder(2,2,2,2));
    contentPane.setLayout(null);
    this.setSize(new Dimension(699, 587));
    this.setTitle("Les élément d\'une classe");
    jList2.setModel(modellist2);
    jList3.setModel(modellist3);
    jList1.setModel(modellist1);
    jLabel6.setBounds(new Rectangle(229, 49, 77, 18));

    //jLabel6.setText(cadre2.recupérer().toString());
//    jLabel6.setText("classe");
    jLabel6.setFont(new java.awt.Font("SansSerif", 2, 20));
    jList2.setFont(new Font("Times New Roman", 2, 20));
    //jList2.setSelectedIndex(0);
    jList2.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        jList2_mouseClicked(e);
      }
    });

    jList2.addListSelectionListener(new ListSelectionListener(){
    public void valueChanged(ListSelectionEvent e)
    {
        txtAreaCadre2.setText(/*jLabel6.getText()+" ; "+*/jList2.getSelectedValue().toString()+newline);
    }
            });

    jList3.setFont(new Font("Times New Roman", 2, 20));
    //jList3.setSelectedIndex(0);
    jList3.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        jList3_mouseClicked(e);
      }
    });

    jList3.addListSelectionListener(new ListSelectionListener(){
    public void valueChanged(ListSelectionEvent e)
    {
        txtAreaCadre2.setText(/*jLabel6.getText()+" ; "+*/jList3.getSelectedValue().toString()+newline);
    }
              });

    jLabel3.setFont(new java.awt.Font("SansSerif", 2, 20));
    jLabel3.setText("Vous pouvez donner une description explicite de cette classe");
    jLabel3.setBounds(new Rectangle(8, 64, 687, 28));

    jLabel4.setFont(new java.awt.Font("SansSerif", 0, 20));
    jLabel4.setText("Libellé :");
    jLabel4.setBounds(new Rectangle(6, 98, 84, 27));

    jPanel2.setBackground(SystemColor.control);
    jPanel2.setBorder(border2);
    jPanel2.setLayout(null);
    jPanel2.setBorder(border5);
    jPanel2.setBounds(new Rectangle(-1, 1, 699, 587));

    jLabel5.setFont(new java.awt.Font("Dialog", 1, 20));
    jLabel5.setText("Définissez les menbres de la classe :");
    jLabel5.setBounds(new Rectangle(7, 27, 370, 25));

    jLabel7.setFont(new java.awt.Font("SansSerif", 2, 20));
    jLabel7.setText("Les Attributs :");
    jLabel7.setBounds(new Rectangle(6, 142, 134, 26));

    jScrollPane1.setBounds(new Rectangle(9, 172, 678, 98));
    jScrollPane1.setAlignmentX((float) 0.8);
    jScrollPane1.setBorder(border2);
    jScrollPane1.getViewport().setBackground(Color.white);
    jScrollPane1.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
    jScrollPane1.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

    jScrollPane2.setBounds(new Rectangle(8, 299, 682, 93));
    jScrollPane2.setAlignmentX((float) 0.8);
    jScrollPane2.setBorder(border2);
    jScrollPane2.getViewport().setBackground(SystemColor.inactiveCaptionText);
    jScrollPane2.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
    jScrollPane2.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

    jLabel9.setBounds(new Rectangle(6, 274, 151, 26));
    jLabel9.setText("Les Opération :");
    jLabel9.setFont(new java.awt.Font("SansSerif", 2, 20));

    jScrollPane3.setBounds(new Rectangle(9, 435, 679, 103));
    jScrollPane3.setAlignmentX((float) 0.8);
    jScrollPane3.setBorder(border2);
    jScrollPane3.getViewport().setBackground(SystemColor.inactiveCaptionText);
    jScrollPane3.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
    jScrollPane3.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

    jLabel10.setFont(new java.awt.Font("SansSerif", 2, 20));
    jLabel10.setText("les nom de Relation :");
    jLabel10.setBounds(new Rectangle(5, 404, 204, 26));

    libellé.setBounds(new Rectangle(91, 100, 465, 21));
    jMenuItem1.setText("Ajouter");
    jMenuItem1.addActionListener(new Cadre3_jMenuItem1_actionAdapter(this));
    jMenuItem2.setText("Modifier");
    jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuItem2_actionPerformed(e);
      }
    });
    jMenuItem2.addActionListener(new Cadre3_jMenuItem2_actionAdapter(this));
    jMenuItem3.setText("Supprimer");
    jMenuItem3.addActionListener(new Cadre3_jMenuItem3_actionAdapter(this));

    jMenuItem4.setText("Ajouter");
    jMenuItem4.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuItem4_actionPerformed(e);
      }
    });
    jMenuItem5.setText("Modifier");
    jMenuItem5.addActionListener(new Cadre3_jMenuItem5_actionAdapter(this));
    jMenuItem6.setText("Supprimer");
    jMenuItem6.addActionListener(new Cadre3_jMenuItem6_actionAdapter(this));

    jMenuItem7.setText("Ajouter");
    jMenuItem7.addActionListener(new Cadre3_jMenuItem7_actionAdapter(this));
    jMenuItem8.setText("Modifier");
    jMenuItem8.addActionListener(new Cadre3_jMenuItem8_actionAdapter(this));
    jMenuItem9.setText("Supprimer");
    jMenuItem9.addActionListener(new Cadre3_jMenuItem9_actionAdapter(this));

    jList1.setModel(modellist1);
    jList1.setFont(new Font("Times New Roman", 2, 20));
    //jList1.setSelectedIndex(0);
    jList1.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        jList1_mouseClicked(e);
      }
    });
    /*jList1.addListSelectionListener(new ListSelectionListener(){
    public void valueChanged(ListSelectionEvent e)
    {
        txtAreaCadre2.setText(/*jLabel6.getText()+" ; "+jList2.getSelectedValue().toString()+newline);
    }
            });*/
    jComboBox1.setBackground(SystemColor.control);
    jComboBox1.setBounds(new Rectangle(358, 29, 136, 21));
    jMenuItem10.setText("Transféré");
    jMenuItem10.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        jMenuItem10_mouseClicked(e);
      }
    });
    jMenuItem11.setText("Transféré");
    jMenuItem12.setText("Transféré");
    jPanel2.add(jLabel5, null);
    jPanel2.add(jLabel3, null);
    jPanel2.add(jLabel4, null);
    jPanel2.add(libellé, null);
    jPanel2.add(jLabel7, null);
    jPanel2.add(jLabel9, null);
    jPanel2.add(jScrollPane1, null);
    jScrollPane1.getViewport().add(jList1, null);
    jPanel2.add(jScrollPane2, null);
    jPanel2.add(jLabel10, null);
    jPanel2.add(jScrollPane3, null);
    jScrollPane3.getViewport().add(jList3, null);
    jScrollPane2.getViewport().add(jList2, null);
    jPanel2.add(jButton1, null);
    jPanel2.add(jButton2, null);
    jPanel2.add(jLabel6, null);
    jPanel2.add(jComboBox1, null);

    jPopupMenu1.addSeparator();
    jPopupMenu1.add(jMenuItem1);
    jPopupMenu1.addSeparator();
    jPopupMenu1.add(jMenuItem10);
    jPopupMenu1.add(jMenuItem2);
    jPopupMenu1.addSeparator();
    jPopupMenu1.add(jMenuItem3);
    jPopupMenu1.addSeparator();

    jPopupMenu2.addSeparator();
    jPopupMenu2.add(jMenuItem4);
    jPopupMenu2.addSeparator();
    jPopupMenu2.add(jMenuItem11);
    jPopupMenu2.add(jMenuItem5);
    jPopupMenu2.addSeparator();
    jPopupMenu2.add(jMenuItem6);
    jPopupMenu2.addSeparator();

    jPopupMenu3.addSeparator();
    jPopupMenu3.add(jMenuItem7);
    jPopupMenu3.addSeparator();
    jPopupMenu3.add(jMenuItem12);
    jPopupMenu3.add(jMenuItem8);
    jPopupMenu3.addSeparator();
    jPopupMenu3.add(jMenuItem9);
    jPopupMenu3.addSeparator();
    contentPane.add(jPanel2, null);
  }

  void jList1_mouseClicked(MouseEvent e) {
    jList1.add(jPopupMenu1); // PopupMenu doit être ajouté au composant dont  l'événement est choisi.
    // Dans cet exemple, nous testons l'événement clic du bouton droit de la souris.
    if (e.getModifiers() == Event.META_MASK)  {
     // Rend visible le jPopupMenu à un point relatif à la position en cours de la souris dans le  conteneur.
      jPopupMenu1.show(jList1, e.getX(), e.getY());
    }
  }

  void jMenuItem3_actionPerformed(ActionEvent e) {
//This method can be called only if
                   //there's a valid selection
                   //so go ahead and remove whatever's selected.
                   jList1.setSelectedIndex(0);
                   int index = jList1.getSelectedIndex();
                   modellist1.remove(index);

                   int size = modellist1.getSize();

                   if (size == 0) { //Nobody's left, disable firing.


                   } else { //Select an index.
                       if (index == modellist1.getSize()) {
                           //removed item in last position
                           index--;
                       }

                       jList1.setSelectedIndex(index);
                       jList1.ensureIndexIsVisible(index);
                   }
                 }

  void jMenuItem6_actionPerformed(ActionEvent e) {
//This method can be called only if
                   //there's a valid selection
                   //so go ahead and remove whatever's selected.
                   jList2.setSelectedIndex(0);
                   int index = jList2.getSelectedIndex();
                   modellist2.remove(index);

                   int size = modellist2.getSize();

                   if (size == 0) { //Nobody's left, disable firing.


                   } else { //Select an index.
                       if (index == modellist2.getSize()) {
                           //removed item in last position
                           index--;
                       }

                       jList2.setSelectedIndex(index);
                       jList2.ensureIndexIsVisible(index);
                   }
                 }

  void jMenuItem9_actionPerformed(ActionEvent e) {
//This method can be called only if
                   //there's a valid selection
                   //so go ahead and remove whatever's selected.
                   jList3.setSelectedIndex(0);
                   int index = jList3.getSelectedIndex();
                   modellist3.remove(index);

                   int size = modellist3.getSize();

                   if (size == 0) { //Nobody's left, disable firing.


                   } else { //Select an index.
                       if (index == modellist3.getSize()) {
                           //removed item in last position
                           index--;
                       }

                       jList3.setSelectedIndex(index);
                       jList3.ensureIndexIsVisible(index);
                   }
                 }

  void jMenuItem5_actionPerformed(ActionEvent e) {
jList2.setEnabled(true);
  }

  void jMenuItem2_actionPerformed(ActionEvent e) {
jList1.setEnabled(true);
  }

  void jMenuItem8_actionPerformed(ActionEvent e) {
jList3.setEnabled(true);
  }

  void jMenuItem4_actionPerformed(ActionEvent e) {
   JFrame Cadre6 = new Cadre6(this);
    Cadre6.setVisible(true);
  }

  void jMenuItem7_actionPerformed(ActionEvent e) {
    JFrame Cadre7 = new Cadre7(this);
    Cadre7.setVisible(true);
  }

  void jMenuItem1_actionPerformed(ActionEvent e) {
    JFrame Cadre5 = new Cadre5(this);
    Cadre5.setVisible(true);
  }

  void jList2_mouseClicked(MouseEvent e) {
    jList2.add(jPopupMenu2); // PopupMenu doit être ajouté au composant dont  l'événement est choisi.
        // Dans cet exemple, nous testons l'événement clic du bouton droit de la souris.
        if (e.getModifiers() == Event.META_MASK)  {
         // Rend visible le jPopupMenu à un point relatif à la position en cours de la souris dans le  conteneur.
          jPopupMenu2.show(jList2, e.getX(), e.getY());
        }
      }
  void jList3_mouseClicked(MouseEvent e) {
    jList3.add(jPopupMenu3); // PopupMenu doit être ajouté au composant dont  l'événement est choisi.
        // Dans cet exemple, nous testons l'événement clic du bouton droit de la souris.
        if (e.getModifiers() == Event.META_MASK)  {
         // Rend visible le jPopupMenu à un point relatif à la position en cours de la souris dans le  conteneur.
          jPopupMenu3.show(jList3, e.getX(), e.getY());
        }
      }
  void jMenuItem10_mouseClicked(MouseEvent e) {
           StringBuffer contenuListe = new StringBuffer();
           int tailleListe = jList1.getModel().getSize();
                   for (int i = 0; i < tailleListe; i++)
                           contenuListe.append(jList1.getModel().getElementAt(i) + "\n");
                   txtAreaCadre2.append(contenuListe.toString());
  }}
class Cadre3_jMenuItem3_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem3_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem3_actionPerformed(e);
  }
}

class Cadre3_jMenuItem6_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem6_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem6_actionPerformed(e);
  }
}

class Cadre3_jMenuItem9_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem9_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem9_actionPerformed(e);
  }
}

class Cadre3_jMenuItem5_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem5_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem5_actionPerformed(e);
  }
}

class Cadre3_jMenuItem2_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem2_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem2_actionPerformed(e);
  }
}

class Cadre3_jMenuItem8_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem8_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem8_actionPerformed(e);
  }
}

class Cadre3_jMenuItem4_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem4_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem4_actionPerformed(e);
  }
}

class Cadre3_jMenuItem7_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem7_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem7_actionPerformed(e);
  }
}

class Cadre3_jMenuItem1_actionAdapter implements java.awt.event.ActionListener {
  Cadre3 adaptee;

  Cadre3_jMenuItem1_actionAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuItem1_actionPerformed(e);
  }
}

class MouseAdapter extends java.awt.event.MouseAdapter {
  Cadre3 adaptee;

  MouseAdapter(Cadre3 adaptee) {
    this.adaptee = adaptee;
  }
  public void mouseClicked(MouseEvent e) {
    adaptee.jList2_mouseClicked(e);
  }
}
merci d'avance
salutation