Creating a List Component
The list fires a list selection event whenever its set of selected items changes. 

 
 // A multiple selection list.
 String[] items = {"item1", "item2"};
 JList list = new JList(items);
 // The next two lines should be in one line.
 list.addListSelectionListener(
   new MyListSelectionListener());
     
 // Make the list single selection mode
 // The next two lines should be in one line.
 list.setSelectionMode(
   ListSelectionModel.SINGLE_SELECTION);
     
 // The next two lines should be in one line.
 class MyListSelectionListener implements
    ListSelectionListener {
 // The next two lines should be in one line.
     public void valueChanged(
       ListSelectionEvent evt) {
         if (!evt.getValueIsAdjusting()) {
             JList list = (JList)evt.getSource();
            // The next two lines should be in one line.
             Object[] selected =
               list.getSelectedValues();
             for (int i=0; i<selected.length; i++) {
                 process(selected[i]);
             }
         }
     }
 }