Comment programmer jcombobox ???

si ce code peut résoudre ton problème :

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Fenetre extends JFrame {

private JPanel container = new JPanel();
private JComboBox combo = new JComboBox();
private JLabel label = new JLabel("Une ComboBox");

public Fenetre(){

this.setTitle("Animation");
this.setSize(300, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);

container.setBackground(Color.white);
container.setLayout(new BorderLayout());

combo.setPreferredSize(new Dimension(100,20));
combo.addItem("Option 1");
combo.addItem("Option 2");
combo.addItem("Option 3");
combo.addItem("Option 4");

JPanel top = new JPanel();
top.add(label);
top.add(combo);

container.add(top, BorderLayout.NORTH);
this.setContentPane(container);
this.setVisible(true);
}
}

alors qu'il te faut un vecteur pour les listes dynamiques

par exemple :

import java.util.Vector;

import javax.swing.JComboBox;
import javax.swing.JFrame;

public class MainClass extends JFrame {
MainClass(String title) {
super(title);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Vector v = new Vector();
v.add("A");
v.add("B");
v.add("C");
JComboBox jcb = new JComboBox(v);

getContentPane().add(jcb);

setSize(200, 50);
setVisible(true);
}

public static void main(String[] args) {
new MainClass("Combo box Demo1");
}
}