On Tue, 2002-11-12 at 22:24, Henrik Olsson wrote:
> >On Tue, 2002-11-12 at 20:22, Laszlo Hornyak wrote:
> >> ok, sorry for the disturbance.
> >>
> >> Laszlo Hornyak
> >>
> >> ps:
> >> StringBuffering code:
> >> time for test: 45479
> >>
> >> String += code:
> >> time for test: 52011
> >
> >+= is slow
> >
> >+ is faster.
> >
> The important thing here are not realy the time it takes to do += or + to
> strings, the biggest cost in handling strings is the creation and gc
>
> Creation and destruction of string objects costs alot in the FOP since
> there are huge misuse of them.
>
> se patch 14013 that runs 20-30% faster and the biggest things are
> optimization of string handling.
>
> So I think StringBuffers shall be used instead of adding strings together.
The add and store operation is slow.
eg
String a = "foo";
a += "bar";
String a = "foo" + "bar";
compiles to approximatly
StringBuffer xxx.append("foo").append("bar");
Which is faster than
StringBuffer xxx.append("foo");
xxx.append("bar");
It's even slightly faster than
StringBuffer xxx.append("foo").append("bar");
understanding what the compiler does is the secret to optimizing
Strings.
For details of why see my earlier post.
> /Henrik
-k.
--
If you don't test then your code is only a collection of bugs which
apparently behave like a working program.
Website: http://www.rocketred.com.au/blogs/kevin/
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