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Groups > comp.lang.java.programmer > #10466
| From | Eric Sosman <esosman@ieee-dot-org.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Verifying a list is alphabetized |
| Date | 2011-12-03 09:02 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <jbda6g$nh$1@dont-email.me> (permalink) |
| References | <722147ec-ab43-4d7c-8b41-32f8705ee7db@i8g2000vbh.googlegroups.com> <jb5k7n$g4u$1@dont-email.me> <4ed9732b$0$294$14726298@news.sunsite.dk> <jbd5k5$86c$1@dont-email.me> |
On 12/3/2011 7:44 AM, Eric Sosman wrote:
> On 12/2/2011 7:54 PM, Arne Vajhøj wrote:
>> On 11/30/2011 11:05 AM, Knute Johnson wrote:
>>> On 11/30/2011 7:52 AM, laredotornado wrote:
>>>> I'm using Java 1.6. Given a java.util.List of Strings, what is the
>>>> quickest way to verify that the list is sorted in ascending order?
>>>>
>>>> Thanks, - Dave
>>>
>>> If it could possibly unsorted, I'd just sort it. How big is this list
>>> anyway?
>>
>> If it is small it does not matter.
>>
>> But I would not recommend an O(nlogn) solution for a O(n)
>> problem unless there is a note in 72 pt red blinking
>> on top of it.
>
> What is the big-Oh complexity of Collections.sort(List<String>)
> on an already-sorted list?
>[...]
Just for fun, I tried it out. For a twenty-element ArrayList,
Vector, Stack, or LinkedList, Collections.sort() uses
19 comparisons if the List is in strictly increasing order,
19 comparisons if the List is in non-decreasing order but
with equal elements,
19 comparisons if the List is in strictly decreasing order,
70 comparisons (!) if the List is in non-increasing order but
with equal elements. (Likely data-dependent.)
Conclusion: I think using the color red for the 72-point
blinking note is overkill. Try white, on a white background. :)
--
Eric Sosman
esosman@ieee-dot-org.invalid
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Verifying a list is alphabetized laredotornado <laredotornado@zipmail.com> - 2011-11-30 07:52 -0800
Re: Verifying a list is alphabetized Knute Johnson <nospam@knutejohnson.com> - 2011-11-30 08:05 -0800
Re: Verifying a list is alphabetized Lew <lewbloch@gmail.com> - 2011-11-30 11:18 -0800
Re: Verifying a list is alphabetized Arne Vajhøj <arne@vajhoej.dk> - 2011-12-02 19:54 -0500
Re: Verifying a list is alphabetized Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-03 07:44 -0500
Re: Verifying a list is alphabetized Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-03 09:02 -0500
Re: Verifying a list is alphabetized Roedy Green <see_website@mindprod.com.invalid> - 2011-12-03 20:05 -0800
Re: Verifying a list is alphabetized Roedy Green <see_website@mindprod.com.invalid> - 2011-12-03 22:13 -0800
Re: Verifying a list is alphabetized Tom Anderson <twic@urchin.earth.li> - 2011-12-04 21:47 +0000
Re: Verifying a list is alphabetized Martin Gregorie <martin@address-in-sig.invalid> - 2011-12-04 12:42 +0000
Re: Verifying a list is alphabetized Patricia Shanahan <pats@acm.org> - 2011-12-04 12:18 -0800
Re: Verifying a list is alphabetized Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-12-04 13:17 -0800
Re: Verifying a list is alphabetized Patricia Shanahan <pats@acm.org> - 2011-12-04 15:32 -0800
Re: Verifying a list is alphabetized markspace <-@.> - 2011-12-04 15:59 -0800
Re: Verifying a list is alphabetized Patricia Shanahan <pats@acm.org> - 2011-12-04 16:14 -0800
Re: Verifying a list is alphabetized markspace <-@.> - 2011-12-04 17:12 -0800
Re: Verifying a list is alphabetized Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-04 21:17 -0500
Re: Verifying a list is alphabetized Tom Anderson <twic@urchin.earth.li> - 2011-12-04 22:11 +0000
Re: Verifying a list is alphabetized Martin Gregorie <martin@address-in-sig.invalid> - 2011-12-04 23:41 +0000
Re: Verifying a list is alphabetized Roedy Green <see_website@mindprod.com.invalid> - 2011-12-12 01:39 -0800
Re: Verifying a list is alphabetized Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-04 08:47 -0500
Re: Verifying a list is alphabetized Gene Wirchenko <genew@ocis.net> - 2011-12-04 21:34 -0800
Re: Verifying a list is alphabetized Patricia Shanahan <pats@acm.org> - 2011-11-30 12:52 -0800
Re: Verifying a list is alphabetized laredotornado <laredotornado@zipmail.com> - 2011-12-01 06:43 -0800
Re: Verifying a list is alphabetized Joshua Maurice <joshuamaurice@gmail.com> - 2011-11-30 13:16 -0800
Re: Verifying a list is alphabetized Roedy Green <see_website@mindprod.com.invalid> - 2011-12-02 01:43 -0800
Re: Verifying a list is alphabetized Patricia Shanahan <pats@acm.org> - 2011-12-02 05:58 -0800
Re: Verifying a list is alphabetized Arne Vajhøj <arne@vajhoej.dk> - 2011-12-02 19:55 -0500
Re: Verifying a list is alphabetized Roedy Green <see_website@mindprod.com.invalid> - 2011-12-03 02:54 -0800
Re: Verifying a list is alphabetized Patricia Shanahan <pats@acm.org> - 2011-12-03 06:17 -0800
Re: Verifying a list is alphabetized Roedy Green <see_website@mindprod.com.invalid> - 2011-12-03 03:10 -0800
Re: Verifying a list is alphabetized Arne Vajhøj <arne@vajhoej.dk> - 2011-12-02 19:52 -0500
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