Trouble with two actionListeners in Java?

Question

Why does my program crash when I have two JComboBoxes with action listeners attached to them, and how do I differentiate between the JComboBoxes?

Answer 1

any ActionListener can determine the source from the event object:

public void actionPerformed(ActionEvent ae){
Object src = ae.getSource();
if (src == combo1){
//do it's thing
}

If each action listener is only added to one combo box, then there isn't any sort of problem. You will need to tell us more if your problem is deeper than that.

Answer 2

Please be clear as to when the program crashes whether while selecting the first or second one