title: Android LRUCache Retrieval
body: <p>I have implemented a standard LRUCache in Android that stores Objects. Each key is a unique ObjectId associated with the Object stored. My problem is that the only way to retrieve an Object from cache is by the ObjectId (no iterator). What would be the best way to implement a getAll() method? 
  Another option would be to store all the ObjectIds in a list somewhere, so I can iterate over the lists and get all of the Objects - but what would be the best way of holding all of the ObjectIds?</p>
  
  <p>Thanks!</p>