Re: baseline performance test using java ...

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 22 Jul 2011 23:41:11 -0400
Message-ID:
<4e2a42da$0$309$14726298@news.sunsite.dk>
On 7/3/2011 2:45 PM, Patricia Shanahan wrote:

On 7/3/2011 11:33 AM, Abu Yahya wrote:

On 7/3/2011 11:23 PM, lbrt chx _ gemale kom wrote:

~ We have all learned we should avoid String(s) and use
StringBuffer(s) or better yet StringBuilder(s) but there is

~

Er, no. Strings are great ...

~
I (obviously) meant to say String(s) if you need to build them
andStringBuilder(s)
if you are working (most of us by now) on some multiprocessing core
~


If you need to build them, you'd need a StringBuilder. And if you need
support for multiple threads AND need to modify them, you'd need a
StringBuffer.


Often, the StringBuffer locking is not strong enough to be really
useful. If, for example, a thread needs to append two strings to the
buffer and have them appear consecutively in the resulting string, it
needs synchronization at a higher level.


StringBuffer is better than StringBuilder in the case where
if >1 threads append N characters to it, then you are happy
if you get N characters appended don't care about the order.
That is practically never the case. The order of characters
is almost always significant.

Arne

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