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Re: SortedMap question?

From David Lamb <dalamb@cs.queensu.ca>
Newsgroups comp.lang.java.programmer
Subject Re: SortedMap question?
Date 2012-11-25 08:49 -0500
Organization A noiseless patient Spider
Message-ID <k8t7l5$l22$2@dont-email.me> (permalink)
References <k8rkud$i3o$1@dont-email.me> <q4qoyde15lpk$.13amx8nbfrj28.dlg@40tude.net>

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On 24/11/2012 6:57 PM, Joerg Meier wrote:
> On Sat, 24 Nov 2012 15:23:55 -0800, Knute Johnson wrote:
>>  I wrote a
>> little test program to measure the amount of time it took to look for
>> non-existent data in a Map and a SortedMap and it took somewhere between
>> twice and three times as long to look for the data in the SortedMap.
>
> Considering Map is an Interface, I question your claim that you measured
> its get(x) performance :p
>
> Assuming you used HashMap, as far as I recall, its get(x) performance is
> already at O(1) unless you mess up your hashcodes. Doesn't really go lower.

The constant factors can matter a lot. 100 > 1 even though both are O(1).

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SortedMap question? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2012-11-24 15:23 -0800
  Re: SortedMap question? Joerg Meier <joergmmeier@arcor.de> - 2012-11-25 00:57 +0100
    Re: SortedMap question? David Lamb <dalamb@cs.queensu.ca> - 2012-11-25 08:49 -0500
      Re: SortedMap question? David Lamb <dalamb@cs.queensu.ca> - 2012-11-25 08:59 -0500
        Re: SortedMap question? "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-11-25 14:02 +0000
          Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 14:20 -0500
        Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 14:24 -0500
          Re: SortedMap question? David Lamb <dalamb@cs.queensu.ca> - 2012-11-25 21:25 -0500
            Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 22:24 -0500
            Re: SortedMap question? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-11-26 15:45 -0800
              Re: SortedMap question? Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-26 20:29 -0500
    Re: SortedMap question? Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-25 09:02 -0500
      Re: SortedMap question? Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-25 17:47 +0000
        Re: SortedMap question? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2012-11-25 16:25 -0800
          Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 19:36 -0500
            Re: SortedMap question? Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-25 22:58 -0500
          Re: SortedMap question? Lew <lewbloch@gmail.com> - 2012-11-25 16:53 -0800
          Re: SortedMap question? Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-26 02:20 +0000
      Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 14:20 -0500
        Re: SortedMap question? Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-25 14:44 -0500
          Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 16:18 -0500
            Re: SortedMap question? Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-25 17:35 -0500
              Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 19:58 -0500
              Re: SortedMap question? Jim Janney <jjanney@shell.xmission.com> - 2012-11-26 12:45 -0700
                Re: SortedMap question? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-11-26 14:26 -0600
        Re: SortedMap question? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-11-25 14:16 -0600
          Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 16:21 -0500
            Re: SortedMap question? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-11-25 17:07 -0600
              Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-25 20:05 -0500
          Re: SortedMap question? "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-11-26 01:34 +0000
            Re: SortedMap question? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-11-25 20:36 -0600
              Re: SortedMap question? "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-12-15 12:27 +0000
  Re: SortedMap question? Robert Klemme <shortcutter@googlemail.com> - 2012-11-25 01:36 +0100
  Re: SortedMap question? Arne Vajhøj <arne@vajhoej.dk> - 2012-11-24 20:00 -0500
  Re: SortedMap question? markspace <-@.> - 2012-11-24 17:34 -0800
    Re: SortedMap question? Robert Klemme <shortcutter@googlemail.com> - 2012-11-25 15:28 +0100
      Re: SortedMap question? Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-25 17:49 +0000
  Re: SortedMap question? "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-11-25 14:00 +0000

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