Actionlistener/JComboBox clash

Question

I'm trying to write a program which will take the input from one drop-down box, and use that to calculate the drop down box for another field, but I keep running into a problem. To make it work, I have to remove all items from on JComboBox, before refilling it, but this causes the program to throw an exception.

jbox1.addActionListener(new ActionListener()
    {
    public void actionPerformed(ActionEvent e)
    {
    autoCalc();

    String s = jbox1.getSelectedItem().toString();
     workS.set1(s);  
    jbox2.removeAllItems();
     for(int i = 0; i <= workS.jbox1.getSelectedItem; i++)
         {
         String temp = ("" + i);
         jbox2.addItem(temp);
         } 
        autoCalc();
     }
});


jbox2.addActionListener(new ActionListener()
    {
    public void actionPerformed(ActionEvent e)
    {
    autoCalc();      
    String s = jbox2.getSelectedItem().toString();
     workS.set2(s);  
        autoCalc();
     }
});

As far as I can tell, removing all items from jbox2 calls the jbox2 actionlistener, which realises that the field is empty and throws an exception. Does anyone have a way around this?

Answer 1

Keep a reference of the ActionListener added to jbox2. Before removing the items and filling with new list remove the ActionListener and readd after model is filled with new items.