how can I detect which combobox state changed?

Question

I have two JComboBox in a form and I added an ItemListener to them and I should overwrite itemStateChanged(), now I wanna say if the first JComboBox items selected do something and else if the second JComboBox items selected do another thing, but I don't know how? Maybe code can help you.

public void itemStateChanged(ItemEvent e) {
if(e.getStateChange()==ItemEvent.SELECTED)
   picture.setIcon(pics[box.getSelectedIndex()]);
}        

In the second line of code I don't know how to recognize which JComboBox state has changed.

Answer 1

You can use ItemEvent#getSource()

Example:

public void itemStateChanged(ItemEvent e) {

if(e.getSource() instanceof JComboBox){
  JComboBox combo = (JComboBox) e.getSource();
  //rest of code
}

Now for distinct combo1 from combo2 , you have 2 options , you can set names to that components like this.

combo1.setName("combo1");
combo2.setName("combo2");

And in the itemListener

if(e.getSource() instanceof JComboBox){
  JComboBox combo = (JComboBox) e.getSource();

   if("combo1".equals(combo.getName())){
        // your code
   }
    .
    .// rest of code
}

Or if you know that they are the same instance, then you can always use ==.

   if(combo1 == e.getSource() ){
        // your code
   }else if (combo2 == e.getSource()){
        //code for combo 2
   }