A TreeSet or TreeMap that allow duplicates

Question

I need a Collection that sorts the element, but does not removes the duplicates.

I have gone for a TreeSet, since TreeSet actu

Answer 1

You can use a PriorityQueue.

PriorityQueue pQueue = new PriorityQueue(); 

PriorityQueue(): Creates a PriorityQueue with the default initial capacity (11) that orders its elements according to their natural ordering.

This is a link to doc: https://docs.oracle.com/javase/8/docs/api/java/util/PriorityQueue.html