Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!nuzba.szn.dk!pnx.dk!fu-berlin.de!uni-berlin.de!news.dfncis.de!not-for-mail
From: =?ISO-8859-1?Q?Sven_K=F6hler?= <remove-sven.koehler@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: simple StringBuilder proposal
Date: Wed, 27 Feb 2013 03:47:24 +0100
Lines: 46
Message-ID: <ap5aalFrj3dU1@mid.dfncis.de>
References: <qa8pi8tgm6kpbcn19l69rfvbclio6spivt@4ax.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Trace: news.dfncis.de jTfnObgN6jZ8T+CUonlx1wSTFcq1BVcnKLWgyTKpR8XHcxT/QXrWyAy4l+
Cancel-Lock: sha1:cwhv9RC6Q3wPbiE5ONk4TO8vJ1w=
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130223 Thunderbird/17.0.3
In-Reply-To: <qa8pi8tgm6kpbcn19l69rfvbclio6spivt@4ax.com>
Xref: csiph.com comp.lang.java.programmer:22562

Hi,

Am 26.02.2013 12:53, schrieb Roedy Green:
> With FastCat, I can write:
> 
>  sb.append( "<input name=\"cx\" type=\"hidden\" value=\"", cseAccount,
> ":", cseCode, "\">\n" );

So I googled and found a FastCat class that has append(String ...) and
append(Object ...) methods. And just by coincidence, you're a co-author
of that class.

So basically, whatever arguments you pass, they are first wrapped in an
array, and then passed to the append method. To make things worse, if
you'd pass a mix of char, int, double, etc. - some of these things would
first be wrapped in Char, Integer, Double, etc. - and then the
toString() method is called.

> It is just shorthand for
> 
> sb.append( "<input name=\"cx\" type=\"hidden\" value=\"",)
> sb.append(cseAccount);
> sb.append(":");
> sb.append(cseCode);
> sb.append( "\">\n" );

No it is not.

> I propose StringBuilder learn the same trick.

So, are you aware of the performance hit? Are you trying to say, that
you prefer convenience over performance here? And if you don't care
about performance in this particular case, why don't you use the +
operator for Strings which is pretty convenient? Or why don't you
exploit the fact that append() returns the StringBuilder instance?

I'm not sure, what to make of your posting. Are you just trying to
promote the FastCat class?

Would you happen to have a benchmark, where you append lots of integers
to a FastCat and a StringBuilder? I would love to see what happens if
you use the append(Object...) method for that.


Regards,
  Sven