>>need to be a space between the quotes if null
Please check before you post more potentially misleading info.
There were more than enough correct answers.
laszlo
"blueads.com" wrote:
>
> I stand corrected,
> However, I believe that there need to be a space between the quotes if
> null.
>
> Tom K.
>
> -----Original Message-----
> From: A mailing list for discussion about Sun Microsystem's Java Servlet
> API Technology. [mailto:[EMAIL PROTECTED]]On Behalf Of Milt
> Epstein
> Sent: Monday, April 17, 2000 8:19 PM
> To: [EMAIL PROTECTED]
> Subject: Re: checking for null in a doPost method
>
> On Mon, 17 Apr 2000, blueads.com wrote:
>
> > Hi Stephen,
> >
> > I noted there is not a space between the pQ2="", so maybe put pQ2="
> > " or pQ2=' ' where a single quotation mark denotes a char space. The
> > difference between == and .equals() should not matter since you are
> > working with a String A.K.A. an Object.
>
> I hate to respond to such an off-topic post, but this response has
> some serious misinformation. There is a *huge* difference between ==
> and .equals(), and that in fact is causing the problem here, as a
> couple of other posters have pointed out. Basically, using .equals()
> accesses a method of an object, and if that object is null, voila,
> NullPointerException. You want to check if it is == null, i.e. if it
> doesn't refer to anything.
>
> There is a bit of confusion added here by the fact that a null String
> object prints out as "null" (no strings), which I'm not sure was the
> greatest decision in the world.
>
> > -----Original Message-----
> > From: A mailing list for discussion about Sun Microsystem's Java Servlet
> > API Technology. [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Lambert, Stephen : CO IR
> > Sent: Monday, April 17, 2000 5:40 PM
> > To: [EMAIL PROTECTED]
> > Subject: checking for null in a doPost method
> >
> >
> > I'm trying to pass blanks for a null into my db from an html form.
> > Code as follows:
> >
> > String pQ2 = request.getParameter("check2");
> > if (pQ2.equals("null") {pQ2="";
> > }
> >
> > I end up with the error "java.lang.NullPointerException".
> > Even though when I display the variable pQ2, it gives me "null"(no
> quotes)
> > using:
> >
> > out.println(pQ2);
> >
> > Anybody know how to check for null data from a doPost method?
> > Thanks,
> > Stephen.
>
> Milt Epstein
> Research Programmer
> Software/Systems Development Group
> Computing and Communications Services Office (CCSO)
> University of Illinois at Urbana-Champaign (UIUC)
> [EMAIL PROTECTED]
>
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