Cleaning jComboBox

Question

Hello again. I have a problem
i have two combobox , one Jcombobox1 is filled from my database
the second Jcombobox2 is filled with data when i select one item from the Jcombobox1
Now ... i need the informacion on Jcombobox2 refresh everytime i select one item on Jcombobox1
i'm trying with this code but the second Jcombobox additems everytime i select one item from the Jcombobox1
JComboBox2 code
try
            String codigo=null;
            DriverManager.registerDriver(new com.mysql.jdbc.Driver());
            Connection conexion = DriverManager.getConnection (
                "jdbc:mysql://localhost/adpostbd","adpost", "");
             PreparedStatement s = conexion.prepareStatement("select cod_depto from depto where edificio_cod_edificio= ?");
            s.setString(1, String.valueOf(jComboBox1.getSelectedItem()));
            ResultSet rs=s.executeQuery();
            while(rs.next())
            codigo=rs.getString("cod_depto");
             jComboBox2.addItem(codigo);
            s.close();
            rs.close();
            conexion.close();
        catch (Exception e)
            e.printStackTrace();
        }thx for the help.

Answer 1

i did something simular in one of my previous programs...
provided you have an action listener on your comboBoxes
public void ActionPerformed(ActionEvent e){
if(e.getSource == Jcombobox1)
Jcombobox2.removeAllItems();
for(int i = 0; i < (Arraylist listOfObjects = Jcombobox1.getObjects()).size()/*whatever objects associate with jcombobox1*/; i++)
Jcombobox1.add(listOfObjects.get(i));
}