-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 David,
On 5/19/2009 3:04 PM, David kerber wrote: > I have a section of code in a frequently-called (~3.5 million times > per day) servlet where I had to process based on a parameter that > could take one of 6 different single-character string values. I had > been using an if .. else if construct. Then I discovered that java > 1.5 allowed constructing a switch on strings. So I did some speed > testing of a standalone java class that compared the 6-option switch > that vs my 6-step if/elseif. I'd be interested to see what the bytecode looks like. Javac compiles switch statements (using primitives) to one of two bytecodes: lookupswitch or tableswitch. If you can get the compiler to generate a tableswitch, your performance will increase dramatically due to the way the bytecode works. See http://java.sun.com/docs/books/jvms/second_edition/html/Compiling.doc.html#14942 for more information on these bytecodes. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkoVlE4ACgkQ9CaO5/Lv0PDzGgCeKdzJpFmzj8uBhaaC99IpSsky 6mQAoMRbUlgGymISSy9AZe79hstWMInR =/Zfb -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
