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Re: SortedMap question?

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From Robert Klemme <shortcutter@googlemail.com>
Newsgroups comp.lang.java.programmer
Subject Re: SortedMap question?
Date Sun, 25 Nov 2012 15:28:11 +0100
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On 25.11.2012 02:34, markspace wrote:
> On 11/24/2012 3:23 PM, Knute Johnson wrote:
>> So am I know correct in thinking that the only real advantage of a
>> SortedMap is if you wish to iterate over the keys of the map in some
>> order?
>
>
> What Robert said.  Also HashMap might have to "grow" itself, resulting
> re-inserting every single element already in the Map.  I think TreeMap
> has a more predictable O(ln n) insertion time for each insertion.
>
> I might be wrong about that: a balanced tree could resort itself pretty
> heavily too on any given insertion.

TreeMap uses a red black tree:
http://docs.oracle.com/javase/6/docs/api/java/util/TreeMap.html

It has some characteristics which according to my memory avoid the 
extreme rebalancing overhead of other binary trees:
http://en.wikipedia.org/wiki/Red_black_tree

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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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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