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

Starting from Java 10:

Set oldSet = Set.of();
Set newSet = Set.copyOf(oldSet);

Set.copyOf() returns an unmodifiable Set containing the elements of the given Collection.

The given Collection must not be null, and it must not contain any null elements.