title: Select Multiple Items In JList Without Using The Ctrl/Command Key
body: <p>I am looking for a way to select multiple items within a JList by just clicking each item.</p>
  
  <p>The normal way to do this is to hold the command/ctrl key and then click.</p>
  
  <p>I think it would be more intuitive just to allow the user to click the items on and off without the need to hold an additional key.</p>