Sepand:
google under "java pass by reference vs. pass by value" and look at the very
first result. It contains a real nice discussion about this..
Geeta
EXCELSIS - Sepand Oboudiyat wrote:
> Hi,
>
> I am currently using Struts 1.0.2 and have notice something with regard to
> handling of ActionForms.
>
> Why is it, that in the "perform()" method of my Action I am able to modify
> the passed-in ActionForm and all modifications that I make to the
> ActionForm in my Action have effect on the ActionForm in the session,
> without the need to reset the modified form in the session. e.g.
>
> public ActionForward peform(ActionMapping mapping,
> ActionForm form,
> HttpServletRequest request,
> HttpServletResponse response,
> )throws IOException, ServletException
>
> {
> MyForm myForm = (MyForm)form;
>
> form.setMemberA("valA");
> form.setMemberB("valB");
>
> // why dont I have to do the following: session.setAttribute
> ("myFormName", myForm);
>
> return "success";
>
> }
>
> I thought that since Java passes method arguments by value and not by
> reference, then I would have to reset my modifed copy back into the session
> for changes on the form to be visible in the form in the session ?
>
> Any insights on how this mechanism works would be greatly appreciated.
>
> Thanks,
>
> Sepand
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
