Firing Item Events
An object wishing to fire item events must implement ItemSelectable. This example shows typical code that an object must implement to fire item events. When an item event is to be fired, fireItemEvent() should be called. 

 
 public class ItemEvents implements ItemSelectable {
     protected EventListenerList listenerList =
        new EventListenerList();
     
     public Object[] getSelectedObjects() {
         return selectedObjects;
     }
     
     public void addItemListener(ItemListener l) {
         listenerList.add(ItemListener.class, l);
     }
         
     public void removeItemListener(ItemListener l) {
         listenerList.remove(ItemListener.class, l);
     }
     
     void fireItemEvent(int selected) {
         ItemEvent evt = null;
         // The next two lines should be in one line
         Object[] listeners =
           listenerList.getListenerList();
     
         for (int i=0; i<listeners.length-2; i+=2) {
             if (listeners[i] == ItemListener.class) {
                 if (evt == null) {
                     // The next two lines should be in one line
                     evt = new ItemEvent(
                       this, ItemEvent.ITEM_STATE_CHANGED,
                         this, selected);
                 }
                 // The next two lines should be in one
                   // line.
                 ((ItemListener)listeners[i+1])
                   .itemStateChanged(evt);
             }          
         }
     }
 }