JComboBox et TextArea

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Bonjour ,
je suis debutant en programmation java et je dois finir ce p'tit programme aujourd'hui donc SVP vos reponses.
je cherche a retrouver la valeur choisit dans le combobox et l'afficher dans le TextArea mais j'arrive pas, j'ai cherché partout mais baf rien marche .
Voila mon Code :

Code:

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package javatool;
import java.awt.event.ActionEvent;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JComboBox;
import javax.swing.*;
/**
 *
 * @author micropixel
 */
public class TrafficSerialPort extends javax.swing.JFrame {
 
    /**
     * Creates new form TrafficSerialPort
     */
    public TrafficSerialPort() {
        initComponents();
    }
 
    /**
     * 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() {
 
        ListPort = new javax.swing.JComboBox();
        jToggleButton1 = new javax.swing.JToggleButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        Traffic = new javax.swing.JTextArea();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        ListPort.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "COM1", "COM2" }));
        ListPort.setToolTipText("");
        ListPort.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                ListPortActionPerformed(evt);
            }
        });
 
        jToggleButton1.setLabel("Start Capture");
        jToggleButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jToggleButton1MouseClicked(evt);
            }
        });
 
        Traffic.setEditable(false);
        Traffic.setColumns(20);
        Traffic.setRows(5);
        jScrollPane1.setViewportView(Traffic);
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(42, 42, 42)
                .addComponent(ListPort, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(69, 69, 69)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(128, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jToggleButton1)
                .addGap(139, 139, 139))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(78, 78, 78)
                        .addComponent(ListPort, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(68, 68, 68)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGap(116, 116, 116)
                .addComponent(jToggleButton1)
                .addContainerGap(68, Short.MAX_VALUE))
        );
 
        pack();
    }// </editor-fold>
 
    private void ListPortActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:
       JComboBox PL = (JComboBox)evt.getSource();
       String SI = (String) PL.getSelectedItem();
 
       ShowTraffic(SI);
 
 
    }                                          
 
    private void jToggleButton1MouseClicked(java.awt.event.MouseEvent evt) {                                            
        // TODO add your handling code here:
        String Port = (String) ListPort.getSelectedItem();
 
 
 
    }                                           
 
    /**
     * @param args the command line arguments
     */
 
    //** JComboBox Handling 
    public void ComboBox ()
    {
        String [] PortName = {"COM1","COM2"}; 
 
        JComboBox PortList = new JComboBox(PortName);
        PortList.setSelectedIndex(0);
        PortList.addActionListener(PortList);
    }
 
    /**
     *
     * @param SI
     */
    public void ShowTraffic (String SI)
    {
        Traffic.setText(SI);
 
    }
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see <a href="http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html" target="_blank">http://download.oracle.com/javase/tu...feel/plaf.html</a> 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(TrafficSerialPort.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TrafficSerialPort.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TrafficSerialPort.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TrafficSerialPort.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /* Create and display the form */
 
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TrafficSerialPort().setVisible(true);
 
            }
        });
    }
    // Variables declaration - do not modify
    public javax.swing.JComboBox ListPort;
    private static javax.swing.JTextArea Traffic;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JToggleButton jToggleButton1;

Bonjour.
Je te propose le code suivant qui fait la même chose que ton programme, mais qui est plus simple (du moins je le pense). Pour récupérer l'élément sélectionné dans une combo, on utilise la méthode

Code:

getSelectedItem()

après avoir au préalable vérifié qu'un élément est bien sélectionné avec la méthode

Code:

getSelectedIndex()

Et je te conseille d'utiliser un jbutton au lieu d'un jtogglebutton, car un simple bouton est bien plus adapté à ton problème.

Code:

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import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
 
public class ComboAndTextArea {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
	JFrame frame = new JFrame();
	DefaultComboBoxModel<String> model = 
                     new DefaultComboBoxModel<>();
	final JComboBox<String> combo = new JComboBox<>(model);
	JButton button = new JButton("Ajouter");
	final JTextArea textArea = new JTextArea(10, 20);
 
	// Ajout des éléments à la fenêtre. Méthode peu recommandée.
	frame.getContentPane().setLayout(new BorderLayout(5, 5));
	frame.getContentPane().add(combo, BorderLayout.PAGE_START);
	frame.getContentPane().add(button, BorderLayout.CENTER);
	frame.getContentPane().add(textArea, BorderLayout.PAGE_END);
 
	// Ajout des élts à la combo.
	model.addElement("Element 1");
	model.addElement("Element 2");
	model.addElement("Element 3");
 
	// Ajout de listener au bouton pour remplir le textarea lors d'un clic.
	button.addActionListener(new ActionListener() {
	    @Override
	    public void actionPerformed(ActionEvent arg0) {
		if (combo.getSelectedIndex() != -1) {
		    String elt = combo.getSelectedItem().toString();
		    textArea.setText(textArea.getText() + elt + "\n");
		}
	    }
	});
 
	// Affichage de la fenêtre.
	frame.pack();
	frame.setResizable(false);
	frame.setVisible(true);
    }
 
}

sa marche merci :D