Re: StringBuilder Difficulties
On Jun 29, 6:58 pm, Gene Wirchenko <ge...@ocis.net> wrote:
On Wed, 29 Jun 2011 15:52:46 -0700, Patricia Shanahan <p...@acm.org>
wrote:
[snip]
It is relatively rare to decide, part way through a build, to throw away
the work so far and begin again with entirely different contents.
I am going to be doing it in a loop. why create a new objec=
t
each iteration?
To avoid promotion of the object to the tenured generation, which
makes GC stuff far less efficient. Quite often it's better to create
the temporary object inside the loop.
You should do what makes sense for the logic of the algorithm and not
try to second-guess and micromanage optimization issues. You totally
have your head in the wrong place here. If the scope of the object,
say the 'StringBuilder', is inside the loop, declare it inside the
loop. Only declare it outside the loop if it's needed outside the
loop. Don't try to be a human HotSpot engine, and stop trying to
defeat the GC optimizations.
--
Lew