Je commence a developer en SWING.
quelqu'un peut-il m'aider a comprendre pourquoi le comboBox ne se rafraichit pas comme il se doit....Il se rafraichit au second EVENT/click dans le comboBox, mais il garde toujours le dernier element 'USA'

voici le code
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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package day1;
 
import java.util.*;
import javax.swing.*;
 
/**
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class RefreshJTable extends JFrame {
 
	private JPanel jContentPane = null;
	private Vector columnName = new Vector();
	private Vector columneData = new Vector();
 
 
	private JComboBox jComboBox = null;
 
	public static void main(String[] args) {
		RefreshJTable rt = new RefreshJTable();
		}
 
	/**
         * This is the default constructor
         */
	public RefreshJTable() {
		super();
		initialize();
 
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
 
	}
	/**
         * This method initializes this
         */
	private void initialize() {
		this.setSize(300, 200);
		this.setContentPane(getJContentPane());
	}
	/**
         * This method initializes jContentPane
         */
	private javax.swing.JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new javax.swing.JPanel();
			jContentPane.setLayout(null);
			jContentPane.add(getJComboBox(), null);
		}
		return jContentPane;
	}
	/**
         * This method initializes jComboBox
         */
	private JComboBox getJComboBox() {
		if(jComboBox == null) {
			jComboBox = new JComboBox();
			columnName.addElement("1");
			columnName.addElement("2");
			columnName.addElement("3");
			jComboBox = new JComboBox(columnName);
 
			jComboBox.setBounds(83, 14, 181, 26);
 
			jComboBox.addActionListener(new java.awt.event.ActionListener() { 
				public void actionPerformed(java.awt.event.ActionEvent e) {    
					System.out.println("actionPerformed()"); 
 
					columnName.addElement("France");
					columnName.addElement("Canada");
					columnName.addElement("USA");
					jComboBox = new JComboBox(columnName);
					repaint();
 
				}
			});
 
		}
		return jComboBox;
	}
}  //  @jve:visual-info  decl-index=0 visual-constraint="15,4"