On Sat, 14 Aug 2004, Richard Welty wrote:
> the authors of 98%-99% of all introductory java textbooks have
> a lot to answer for. my favorite example of the lot is that
> they all teach programmers to use String in the following manner:
>
> String query
> = "SELECT foo "
> + "FROM bar "
> + "WHERE baz = 'bletch';"
>
There is actually nothing wrong with this particular example. I realize
you are pointing out an issue that can happen, so this is a just "for the
record" post. In this case the concatenation is done at compile time.
See:
http://www.java-performance-portal.org/article6.html
Further the usage of string concatenation is easier to read/write so you
need to actually consider wether the code in question is actually a
hotspot and worth StringBuffer(ifying). Again your example is pointing to
a database query in which case so many other things are going on it's
unlikely to make any performance difference.
Kris Jurka