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I am trying to get the key value from a Map and cast to a String.

I am getting a class cast exception.

Map queryArgs = request.getParameterMap();

urlSurveyIdInt = ((Integer) session.getAttribute("surveyid")
).intValue();

The intended behavior is to capture the URL parameter surveyid value
from a URL such as this:

http://myDomain.com/survey.jsp?surveyid=1
Can someone help?

Thanks in advance

> urlSurveyIdInt = ((Integer) session.getAttribute("surveyid")
> ).intValue();
>
> The intended behavior is to capture the URL parameter surveyid value
> from a URL such as this:
>
> http://myDomain.com/survey.jsp?surveyid=1
> Can someone help?
>
> Thanks in advance

You can't just cast one object type to another. In this case, you
could try something like this:

urlSurveyIdInt = new Integer( session.getAttribute( "surveyid" )
).intValue();

This is very basic Java, BTW. Questions like this might be better
directed to comp.lang.java.help in future.

ps. Be sure to catch the NumberFormatException...

"dolobran" <> skrev i en meddelelse
news: ups.com...
> I am trying to get the key value from a Map and cast to a String.

Are you sure that is what you are trying to do? Your use if the terms is a
little ambiguous also: with a map one talks about "keys" and "values"; to
talk about "key values" is a bit confusing.


> I am getting a class cast exception.
>
> Map queryArgs = request.getParameterMap();
>
> urlSurveyIdInt = ((Integer) session.getAttribute("surveyid")
> ).intValue();

This is not from the request. Are you trying to get it from the session
(HttpSession) ?


> The intended behavior is to capture the URL parameter surveyid value
> from a URL such as this:
>
> http://myDomain.com/survey.jsp?surveyid=1
> Can someone help?

Something like this?

String s = request.getParameter( "surveyid" );
if ( s != null ) {
int i = Integer.parseInt( s );
}

(Could still get a NumberFormatException if the string is not convertible).

"Sudsy" <> skrev i en meddelelse
news:z_Ovd.55$...
>
> > urlSurveyIdInt = ((Integer) session.getAttribute("surveyid")
> > ).intValue();
> >
> > The intended behavior is to capture the URL parameter surveyid value
> > from a URL such as this:
> >
> > http://myDomain.com/survey.jsp?surveyid=1
> > Can someone help?
> >
> > Thanks in advance
>
> You can't just cast one object type to another. In this case, you
> could try something like this:
>
> urlSurveyIdInt = new Integer( session.getAttribute( "surveyid" )
> ).intValue();
>
> This is very basic Java, BTW. Questions like this might be better
> directed to comp.lang.java.help in future.
>
> ps. Be sure to catch the NumberFormatException...

Also, if he is using the session, why not just store the Integer object
there? Then he can do

int myInt = ((Integer)session.getAttribute( "surveyid" )).intValue;

But if it is the request he is using, why not rather

int myInt = Integer.parseInt( request.getParameter( "surveyid" );

Peter Kirk wrote:
<snip>
> Also, if he is using the session, why not just store the Integer object
> there? Then he can do
>
> int myInt = ((Integer)session.getAttribute( "surveyid" )).intValue;
>
> But if it is the request he is using, why not rather
>
> int myInt = Integer.parseInt( request.getParameter( "surveyid" ) );

Both good points! I was presuming (never a good thing!) that the OP
actually /wanted/ the Integer object at some point further on. If not
then simply using Integer#parseInt is a lot more appropriate.
Just don't try to use Integers in your Struts forms!