Several replies to this thread have suggested code that may crash (i.e.
throw a NullPointerException) if the parameter is not present. Instead of
doing this:
if (request.getParameter("sub").equals("")) ...
which will crash if getParameter() returns null, you should do this:
if ("".equals(request.getParameter("sub")) ...
which will work even if getParameter() does return null.
Hope this helps.
--
Martin Cooper
Tumbleweed Communications
----- Original Message -----
From: "Tony Leake" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 01, 2001 5:41 AM
Subject: Simple newbie question
> Hi,
>
> I'm trying to test a parameter to see if it exists:
>
> on page 1 i have a form with a text field
>
> <input type="text" name="thread">
>
> on page 2 i want to test if the box was filled in and if it contains a
> string or a number. I can't even seem to test if thread is empty.
>
> I've tried
>
> if(request.getParameter("sub")=="")
> {
> //stuff
> }
> but that doesn't seem to do anything.
>
> thanks for any help
> Tony
>
> _________________________________________________________________________
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>
>
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