title: Get multiple selected items from a JList
body: <p>I am creating a screen with four lists on it.  Basically two pairs of lists where you can select lines on one list in the pair and move them to the other list in the pair.</p>
  
  <p>Looking at the documentation I need a ListSelectionModel for each list to determine which lines have been selected.  I will use a [Sel] or [Des] button to do the actual transfer.</p>
  
  <p><img src="https://i.stack.imgur.com/SnAED.jpg" alt="sample screen"></p>
  
  <p>The documentations and samples say I need a ListSelectionListener but as I will not access the model until the user clicks on the button do I actually need a listener?  Will the model still have the getMinSelectionIndex, getMaxSelectionIndex and isSelectedIndex set if I do not have a listener?</p>