Question

I am working on Java swing application using data base with MySQL

I need to know if I can deactivate components until select an element from JComboBox? I must know the choice of the 1st jcombobox to fill the 2nd JComboBox; the 1st choice is a foreign key on the 2nd, like that :

ResultSet res = st.executeQuery("SELECT NomF FROM famille_de_type");
while (res.next()) {
    comboBox_Fam_innewT.addItem(res.getString(1));                
}

this is my example :

Answer 1

Of course, you can. When you start work call setEnabled(false) to second comboBox. And add to 1st combobox ItemListener. It will be listen item selection.

firstComboBox.addItemListener(new ItemListener()
    {
        public void itemStateChanged(ItemEvent e)
        {
            if (e.getStateChange()==ItemEvent.SELECTED)
            {
                Object selectedItem = e.getItem(); // new item selected
                // TODO select values for 2nd combobox
                // TODO fill 2nd combobox
                secondComboBox.setEnabled(true);
            }
        }
    });