Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #19167

Re: Glitch in Java Collections (No descendingMap in LinkedHashMap)

Show all headers | View raw

Jan Burse schrieb:
> glen herrmannsfeldt schrieb:
>>> But I was not aspiring in detecting this glitch. I am more interested
>>> >in the reverse iterator. Any route to get at a reverse iterator?
>> Write a loop that takes objects and pushes them onto a stack.
>> Then remove them from the stack in the appropriate order.
>
> The idea would of course be to have an iterator and not
> do a copy of the LinkedHashMap. Copying the LinkedHashMap
> could be a last resort, but for larger LinkedHashMaps and
> frequent iteration this is not an option.
>
> Bye
>

On the other hand.

One could hold a parallel structure to the LinkedHashMap,
and already fill this parallel structure during put(). And
then use this parallel structure for the reverse iteration.

For example instead:

     put(key, value);

One could do:

     if (put(key, value)==null)
       list.add(key);

And then use the list in reverse order to get a
keySet reverse iterator.

Bye

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-04 14:09 +0200
  Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Robert Klemme <shortcutter@googlemail.com> - 2012-10-04 23:01 +0200
    Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Lew <lewbloch@gmail.com> - 2012-10-04 14:43 -0700
      Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-05 00:17 +0200
      Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Robert Klemme <shortcutter@googlemail.com> - 2012-10-05 19:11 +0200
        Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Lew <lewbloch@gmail.com> - 2012-10-05 11:05 -0700
          Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-05 20:18 +0200
          Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-10-05 12:06 -0700
            Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Lew <lewbloch@gmail.com> - 2012-10-05 13:04 -0700
              Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-05 23:44 +0200
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-05 23:50 +0200
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-06 00:00 +0200
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-10-05 23:39 +0000
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-06 12:18 +0200
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-06 12:22 +0200
              Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-10-05 15:51 -0700
          Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Robert Klemme <shortcutter@googlemail.com> - 2012-10-06 13:53 +0200
  Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-09 14:16 -0600
    Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-10 09:00 -0600
      Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-10-10 11:34 -0400
        Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-10 10:28 -0600
          Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-10 11:45 -0600
            Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Lew <lewbloch@gmail.com> - 2012-10-10 10:52 -0700
              Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-10 12:47 -0600
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-11 14:17 -0600
            Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-10-10 18:20 -0400
              Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-10 16:51 -0600
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-12 14:34 +0200
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jim Janney <jjanney@shell.xmission.com> - 2012-10-12 09:12 -0600
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-10-12 11:42 -0400
                Re: Glitch in Java Collections (No descendingMap in LinkedHashMap) Jan Burse <janburse@fastmail.fm> - 2012-10-12 21:02 +0200

csiph-web