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Groups > comp.lang.java.programmer > #27937
| From | Jeff Higgins <jeff@invalid.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: LinkedHashMap - get latest key? |
| Date | 2014-04-02 12:06 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <lhhcmb$9p7$1@dont-email.me> (permalink) |
| References | <slrnljo8ia.rhr.avl@login.logic.tuwien.ac.at> |
On 04/02/2014 10:44 AM, Andreas Leitgeb wrote: > Given a LinkedHashMap instance, what would be a > reasonable way to obtain the latest added key? > > The specific definition of "reasonable" being: > - no separate keeping track of key-sequence > - it should be a O(1) operation, and not > have to iterate all keys. > > Unlike TreeMap, the LinkedHashMap doesn't implement > NavigableMap. > > If nothing else helps, I'll need to switch to a LinkedList, > and thereby sell the "O(1)" of searching for an Object (by > key) in exchange for a "O(1)" of obtaining the last Object. > > It just seems odd to me, that a LinkedHashMap doesn't > have such a nobrainer getter, or, that a LinkedHashMap > isn't also a NavigableMap with the natural ordering > induced by position. > ? Collections.max(myMap.entrySet())
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LinkedHashMap - get latest key? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-02 14:44 +0000
Re: LinkedHashMap - get latest key? Jeff Higgins <jeff@invalid.invalid> - 2014-04-02 12:06 -0400
Re: LinkedHashMap - get latest key? Jeff Higgins <jeff@invalid.invalid> - 2014-04-02 12:44 -0400
Re: LinkedHashMap - get latest key? Jeff Higgins <jeff@invalid.invalid> - 2014-04-02 13:13 -0400
Re: LinkedHashMap - get latest key? Jeff Higgins <jeff@invalid.invalid> - 2014-04-02 13:19 -0400
Re: LinkedHashMap - get latest key? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-02 21:58 +0000
Re: LinkedHashMap - get latest key? Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-04-16 21:33 -0700
Re: LinkedHashMap - get latest key? leif.roar@invalid.com (Leif Roar Moldskred) - 2014-04-17 03:32 -0500
Re: LinkedHashMap - get latest key? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-19 12:51 +0000
Re: LinkedHashMap - get latest key? v_borchert@despammed.com (Volker Borchert) - 2014-04-21 20:38 +0000
Re: LinkedHashMap - get latest key? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-25 09:18 +0000
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