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From: =?ISO-8859-1?Q?Sven_K=F6hler?= <remove-sven.koehler@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: FastCat 'performance'
Date: Thu, 28 Feb 2013 05:19:46 +0100
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Am 27.02.2013 22:51, schrieb Joerg Meier:
> On Wed, 27 Feb 2013 13:42:00 -0800 (PST), Lew wrote:
> 
>> How does it compare to using String +?
> 
> I didn't include + in my initial benchmark because I learned some time ago
> that both javac as well as HotSpot will just convert it to StringBuilder
> behind the scenes in most circumstances.

Java Compilers will substitute any + operations on String with calls to
StringBuffer (-source 1.3 and below) or StringBuilder (-source 1.4 or
above). I'm not aware, of any optimizations within the JVM (e.g.
Hotspot), but at byte-code level there is no such thing as a + operator
for strings.


Regards,
  Sven