TreeSet problem: last() returns with NoSuchElementException

[sanka_82]

Hi all!

I have a small problem using TreeSet.
Given:
I am using a TreeSet with a comparator. While I have debugged my application I found that I have some elements in this set but I got a NoSuchElementException when I try to get the last element.

SortedSet<TimeBarSection> elementsBefore = sections.headSet(section);
return elementsBefore.isEmpty() ? null : elementsBefore.last();

where sections is the TreeSet I mnetioned above.

Thank you for your comments.

[sanka_82]

Hi again!

I found a solution (workaround?!):

TreeSet<TimeBarSection> elementsBefore = new TreeSet<TimeBarSection>(TimeBarSection.BY_START_COMPARATOR);

elementsBefore.addAll(sections.headSet(section));

In this case I could see the whole structutre of the tree (root, left, right,...).
Does anyone have any idea why it works in this way?

Thx