The only other possible way I can think of, and I would have to do so
experimenting to see if/how exactly it would work, would be something
like:
try {
Object a = b; // Where b might be declared or might not be
} catch (????) { // Not sure what exception would be thrown
// Do something when b wasn't declared
}
I'm assuming there is a runtime exception to check for... that may not be
true at all... part of me suspects there isn't... that's why I'd have to
do some experimenting :)
In fact, being in a JSP this might be the best option because I'm not sure
how you could use reflection as I suggested, i.e., what object would you
inspect when the field you want to check for is a JSP variable? I'm not
sure.
--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
On Mon, June 13, 2005 8:58 am, Charles P. Killmer said:
> Thanks. And I do mean declared. I have a jsp that is included by a few
> other jsp's. Some of them declare a variable and some do not. Right
> now I have two files that are almost identical. One expects the
> variable to be present and the other does not. I am looking to
> consolidate these two files.
>
> Charles
>
> -----Original Message-----
> From: Frank W. Zammetti [mailto:[EMAIL PROTECTED]
> Sent: Friday, June 10, 2005 5:46 PM
> To: Tomcat Users List
> Subject: Re: Probably an easy answer
>
> If it is a class member you could conceivably use reflection to see if a
> given object/class has a member you name... if it's local though, no,
> it's a purely compile-time check.
>
> Do you really mean declared or do you perhaps mean initialized?
>
> Frank
>
> Charles P. Killmer wrote:
>> Is there a way to, at runtime, check if a variable is declared? I
>> have some code that I want to behave differently depending on whether
>> or not a variable has been declared. I tried using a try catch block
>> but it gets caught at compile time.
>>
>> Thanks
>> Charles
>>
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>>
>>
>>
>>
>
> --
> Frank W. Zammetti
> Founder and Chief Software Architect
> Omnytex Technologies
> http://www.omnytex.com
>
>
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