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Groups > comp.lang.java.programmer > #18437
| From | Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Question about HashMap and Map.Entry ... |
| Date | 2012-08-30 17:39 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <slrnk3v9ba.u9l.avl@gamma.logic.tuwien.ac.at> (permalink) |
Given a (Hash)Map<Long,Long> map and two Long values k and v, Some task is to see if k is already in the map, and only if so, then update the value in the map based on previous value and v. Of course, that is trivial, and I've already implemented it with containsKey(), get() and put(). It's just, that it seems to me that my piece of code could be a bit *clearer*, if I could obtain the Map.Entry for "k", and (if that isn't null) do getValue() and setValue(...) on the Entry. What I'm missing, however, is: How would I get the Entry for a given key? (apart from scanning all through the entrySet()) PS: using 1.6, but also interested in future (i.e. 1.7 or even newer) prospects, and also in (any) explicit reasons for *not* having some map.getEntry(K k). Also, such an Entry should be tied to the Map just like those in the entrySet(). NavigableMap has methods that return Entries with "snapshot"-semantics, which is *not* what I'm looking for.
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Question about HashMap and Map.Entry ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-30 17:39 +0000
Re: Question about HashMap and Map.Entry ... markspace <-@.> - 2012-08-30 10:46 -0700
Re: Question about HashMap and Map.Entry ... Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-30 11:15 -0700
Re: Question about HashMap and Map.Entry ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-30 19:24 +0000
Re: Question about HashMap and Map.Entry ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-30 19:32 +0000
Re: Question about HashMap and Map.Entry ... Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-30 13:08 -0700
Re: Question about HashMap and Map.Entry ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-30 21:55 +0000
Re: Question about HashMap and Map.Entry ... Robert Klemme <shortcutter@googlemail.com> - 2012-08-31 07:27 +0200
Re: Question about HashMap and Map.Entry ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-31 10:26 +0000
Re: Question about HashMap and Map.Entry ... Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-31 11:22 -0700
Re: Question about HashMap and Map.Entry ... Robert Klemme <shortcutter@googlemail.com> - 2012-09-01 11:06 +0200
Re: Question about HashMap and Map.Entry ... markspace <-@.> - 2012-08-30 14:30 -0700
Re: Question about HashMap and Map.Entry ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-30 22:42 +0000
Re: Question about HashMap and Map.Entry ... markspace <-@.> - 2012-08-30 14:34 -0700
Re: Question about HashMap and Map.Entry ... Lew <lewbloch@gmail.com> - 2012-08-30 13:42 -0700
Re: Question about HashMap and Map.Entry ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-30 22:34 +0000
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