I add more details. I need to sort DocumentCollection from dql search.
I've just tried intersect with a viewentrycollection, but with big query the performance are too slow!

I haven't personally used it, but the org.openntf.domino.helpers.DocumentSorter class looks like what you're talking about. You'd use it like:

DocumentSorter sorter = new DocumentSorter(docColl, Arrays.asList("LastName"));
DocumentCollection sorted = sorter.sort();

You could probably then get reverse ordering by using:

List<Document> docs = new ArrayList<>(sorted);
Collections.reverse(docs);

That said, I think it's likely that performance wouldn't necessarily be better than what you're seeing without it - the sorting loads each document in the collection to read the fields and has no special acceleration from Domino.