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From: Gene Wirchenko <genew@ocis.net>
Newsgroups: comp.lang.java.programmer
Subject: Re: StringBuilder Difficulties
Date: Tue, 05 Jul 2011 17:29:27 -0700
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On 5 Jul 2011 21:16:44 GMT, blmblm@myrealbox.com
<blmblm.myrealbox@gmail.com> wrote:

>In article <jsu6171vmasu6jfvsbroa052n8u7ukarr3@4ax.com>,
>Gene Wirchenko  <genew@ocis.net> wrote:
>> On 5 Jul 2011 19:12:39 GMT, blmblm@myrealbox.com
>> <blmblm.myrealbox@gmail.com> wrote:
>> 
>> [snip]
>> 
>> >What I found is that HashSet was noticeably faster on all the
>> >systems where I ran the benchmarks.  Unless you need for the set
>> >to be sorted (and it's not apparent from your code that you do),
>> >why not .... ?  (I'm curious too about why you chose TreeSet in
>> >the first place.  ? )
>> 
>>   1) I can output the set in order without having to do anything else.
>> My real program has a lot of debugging info dumping.  (Read as "checks
>> that I have not done something wrong".)
>
>
>Ah.  Well, yes, then you probably do need a SortedSet, though
>considering that you initially build the set from a string that's in
>order, maybe you could use that (the string) instead.  Just sayin',
>maybe.

     I set the string value that way so that the binary search would
work.

>>   2) When I read "hash", I think "collision", and I get nervous.
>> Nothing I read reassured me that that could not happen.

>Why would that make you nervous?  If you're worried about
>correctness, um, as far as I know hash tables are supposed to
>deal with collisions in some way that preserves the overall "map"
>semantics.  Performance may suffer if there are a lot of collisions,
>but -- benchmark on the system(s) of interest and check?

     I would need to know what the behaviour is supposed to be.  I
have something that works for now.  Optimisation comes after getting
it working.

>>   3) I had to pick something.  If it works, I can change it later.  If
>> it does not, I have not solved my problem yet.  The former is safer.

>Sure.  Then again, if you were only concerned about getting something
>that works, why try various alternatives ....  <shrug>

     1) Just in case there was a BIG difference.  2) To learn more
about Java.  At some point though, I have to do something useful with
it.

     My preprocessor is shaping up nicely.  I have to write the symbol
define command code, handle the include command, and handle output to
a file.  That is about it.  Which means that there are probably only
about three other things that I will come up.

Sincerely,

Gene Wirchenko