Creating instances by reflection - how expensive?

[PerfectDayToChaseTornados]

Hi All, I was wondering what peoples opinions, or experience were with
creating instances by reflection. How expensive is the following code? It is
from a factory class, I was wondering whether to create a cache of the
instances when first created & then return clones.

Command returnCommand = null;
String requestedComman d = request.getPath Info();
if(requestedCom mand != null){
try {
Class commandClass = Class.forName(r equestedCommand );
Class[] parameterTypes = new Class[0];
Constructor commandConstruc tor =
commandClass.ge tConstructor(pa rameterTypes);
Object[] initArgs = new Object[0];
returnCommand = (Command)
commandConstruc tor.newInstance (initArgs);
}
catch (ClassNotFoundE xception ....etc etc

Thanks :-)
--
-P

[Tony Morris]

That's one of those things where you'll just have to Try It And See(TM).
Run some benchmarks on different VMs and operating environments.
I'm sure they'll come in handy to yourself or someone else one day - post
them to a web site even.

--
Tony Morris
(BInfTech, Cert 3 I.T., SCJP[1.4], SCJD)
Software Engineer
IBM Australia - Tivoli Security Software
Home : [phone]
Work : [phone]
Mobile : [phone]
(2003 VTR1000F)
"PerfectDayToCh aseTornados" <pd***@emailadd ress.invalid> wrote in message
news:Z9******** *****@news-binary.blueyond er.co.uk...

Hi All, I was wondering what peoples opinions, or experience were with
creating instances by reflection. How expensive is the following code? It is from a factory class, I was wondering whether to create a cache of the
instances when first created & then return clones.

Command returnCommand = null;
String requestedComman d = request.getPath Info();
if(requestedCom mand != null){
try {
Class commandClass = Class.forName(r equestedCommand );
Class[] parameterTypes = new Class[0];
Constructor commandConstruc tor =
commandClass.ge tConstructor(pa rameterTypes);
Object[] initArgs = new Object[0];
returnCommand = (Command)
commandConstruc tor.newInstance (initArgs);
}
catch (ClassNotFoundE xception ....etc etc

Thanks :-)
--
-P