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Groups > comp.lang.java.programmer > #21450

Re: idea for more efficient HashMap

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On Tuesday, January 15, 2013 6:56:29 AM UTC+1, Kevin McMurtrie wrote:
> In article <9hc2f8ltgn1bmdsrk8vb9kuu1vi5dkl2r5@4ax.com>,
>  Roedy Green <see_website@mindprod.com.invalid> wrote:
> > Inside HashMap are little glue Entry objects that point to the key and
> > value.
> 
> > What if you could implement an interface on your objects so that
> > HashMap could use them directly without separate key or Entry glue?.
> > 
> 
> > e.g. getKey()
> >        getPrev()
> >        getNext()
> >        setPrev()
> >        setNext()
> > 
> 
> > One drawback would be your objects could live on only one such
> > space-efficient HashMap.
> 
> I've done this when efficiency demanded it.  The downside is that you 
> can't implement java.util.Map or java.util.Dictionary because of the way 
> put(K,V) is declared.

Why that?  I actually have done that implementation (see above) and it is consistent with the Map interface.

> I will not see posts from Google because I must filter them as spam

That might be a mistake - you'll might lose valuable feedback that way.

Kind regards

robert

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idea for more efficient HashMap Roedy Green <see_website@mindprod.com.invalid> - 2013-01-12 01:55 -0800
  Re: idea for more efficient HashMap v_borchert@despammed.com (Volker Borchert) - 2013-01-12 14:21 +0000
  Re: idea for more efficient HashMap Robert Klemme <shortcutter@googlemail.com> - 2013-01-13 19:44 +0100
  Re: idea for more efficient HashMap Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2013-01-14 21:56 -0800
    Re: idea for more efficient HashMap Robert Klemme <shortcutter@googlemail.com> - 2013-01-16 14:31 -0800
      Re: idea for more efficient HashMap Lars Enderin <lars.enderin@telia.com> - 2013-01-17 10:23 +0100
        Re: idea for more efficient HashMap Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2013-01-17 19:30 -0800
          Re: idea for more efficient HashMap Robert Klemme <shortcutter@googlemail.com> - 2013-01-20 20:28 +0100
          Re: idea for more efficient HashMap Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-01-20 14:49 -0500
          Re: idea for more efficient HashMap Roedy Green <see_website@mindprod.com.invalid> - 2013-01-29 01:41 -0800
            Re: idea for more efficient HashMap Arne Vajhøj <arne@vajhoej.dk> - 2013-01-29 22:03 -0500
              Re: idea for more efficient HashMap Gene Wirchenko <genew@telus.net> - 2013-01-30 11:34 -0800
                Re: idea for more efficient HashMap Arne Vajhøj <arne@vajhoej.dk> - 2013-01-30 21:35 -0500
                Re: idea for more efficient HashMap Gene Wirchenko <genew@telus.net> - 2013-01-31 10:47 -0800
                Re: idea for more efficient HashMap Arne Vajhøj <arne@vajhoej.dk> - 2013-02-01 19:57 -0500

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