title: Adding an object to multiple java collections: Does this make multiple copies?
body: <p>If I add the same object to two different collections, does that make a copy of the object in each collection, or do the collections get references to the same object?  </p>
  
  <p>What I'm trying to do is use two different collections to manage the same set of objects, but allow me different methods to access and order the objects.  </p>