Copying sets Java

Question

Is there a way to copy a TreeSet? That is, is it possible to go

Set  itemList;
Set  tempList;

tempList = itemList;
<         


        

Answer 1

With Java 8 you can use stream and collect to copy the items:

Set newSet = oldSet.stream().collect(Collectors.toSet());

Or you can collect to an ImmutableSet (if you know that the set should not change):

Set newSet = oldSet.stream().collect(ImmutableSet.toImmutableSet());