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Posted to user@struts.apache.org by Neil Meyer <ne...@cxchange.co.za> on 2006/03/24 07:37:54 UTC
[OT]
Hi All,
This ons is off topic again.
When I loop for an arraylist I normally use the the first option as it seems
to me that it will execute the quickest. I know supposedly I should use the
foreach loop.
All that I want to do is go through the list no adding new elements or
anything.
Am I correct to say that the first option is best in this case?
for (int i = 0; i < a.size(); i++) {
System.out.println(a.get(i));
}
for (Iterator<String> iter = a.iterator(); iter.hasNext();) {
System.out.println(iter.next());
}
Regards
Neil Meyer
-----Original Message-----
From: Frank W. Zammetti [mailto:fzlists@omnytex.com]
Sent: 14 March 2006 05:31 PM
To: Struts Users Mailing List
Cc: user@struts.apache.org
Subject: Re: [OT]Struts - AJAX, best solution
On Tue, March 14, 2006 9:32 am, Ashish Kulkarni said:
> Hi
> I have a couple of questions below
> 1 What is the best soluction to have struts and AJAX
> work together?
> I have read about DWR, Java Web parts, AjaxAnywhere,
> But which is the good one, and why?
Well, of course I'm going to say AjaxTags in Java Web Parts :) I think it
is unique among AJAX solutions at this time because it is almost entirely
declarative. There is (in most cases) zero client-side code to write, yet
it also offers a great deal of extensibility to make it even more
powerful. This makes it, I think, attractive to many people, those that
don't quite have the client-side skill but have a ton of server-side
skill. It can in essence grow with your Javascript skills.
However, I will say that I recently used DWR for a project and I totally
love it! It's very clean, very easy (*IF* you have some Javascript
knowledge) and really, in my experience, works very well. It also offers
some ready-made integration with popular libraries like Struts, Spring and
Hibernate. I have no problem at all recommending DWR (I liked it so much
that I'm hoping at some point I can contribute to it).
(FYI, because of the extensibility AjaxTags in JWP offers, I'm thinking of
writing a handler to integrate with DWR, so you'll be able to use it, to a
limited degree at least, in the same declarative fashion).
Dojo also gets a lot of rave reviews, as does Scriptaculous. I think it
all depends on what your looking to accomplish... DWR and JWP are a bit
more low-level than some of the others... for instance, they don't offer
widgets and such. If your after some of the more high-level things like
widgets and special effects and such, Dojo and Scriptaculous are
definitely worth exploring.
> 2 What is better for response XML file or comman
> delimeted string, or build HTML in action class and
> pass it to java script to replace it.
Very much depends on what your doing. I will say that contrary to the X
in AJAX, my experience has been that people tend to NOT use XML at all.
XML parsing on the client is a somewhat expensive operation, so certainly
if your returning more than a small chunk of XML, you might want to
consider if XML is the best choice. In the end though, it depends on what
your returning.
(FYI: I'm not sure this is common knowledge, but I wrote a client-side
implenentation of Commons Digester, which can be found in Java Web Parts.
It doesn't offer the full Digester capabilities of course, but if you like
Digester for XML parsing, as I do, you may want to have a look).
> 3 Also if i have my own java script to do Ajax
> what do i return in Action class, normally in action
> class i do
> mapping.findForward("success"); after loading the
> form, this will redirect response to the required JSP.
> How does this change in AJAX, how do i reload only
> part of JSP.
You can do one of two things... first, you can render the entire response
in your Action, and then return null. This tells Struts that teh response
is fully formed and no forward/redirect is required.
Alternatively, and again I'm not so sure this is common knowledge, you can
simply forward to a JSP like always and allow IT to render the AJAX
response. For instance, if your rendering some XML, how easy is that to
do with JSTL and Struts tags? Pretty easy! No need to write a bunch of
out.println's in an Action, just use a JSP! The client doesn't know how
the response was generated, it just takes the response as-is.
Hope that helps!
Frank
--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
AIM: fzammetti
Yahoo: fzammetti
MSN: fzammetti@hotmail.com
Java Web Parts -
http://javawebparts.sourceforge.net
Supplying the wheel, so you don't have to reinvent it!
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Re: [OT]
Posted by Tamas Szabo <sz...@gmail.com>.
Hi,
for ArrayList it is.
But you should code to interfaces so you can change the implementation
without any problems.
Anf if your a is declared as a List then you won't know.
The for loop is faster for an ArrayList but it can't be faster for a linked
listed for example.
If you take it on step further you can use Iterators on all Collections, the
for will work only for loops.
I am always using Iterator and a is always declared as a List.
Tamas
On 3/24/06, Neil Meyer <ne...@cxchange.co.za> wrote:
>
> Hi All,
>
> This ons is off topic again.
>
> When I loop for an arraylist I normally use the the first option as it
> seems
> to me that it will execute the quickest. I know supposedly I should use
> the
> foreach loop.
>
> All that I want to do is go through the list no adding new elements or
> anything.
>
> Am I correct to say that the first option is best in this case?
>
>
> for (int i = 0; i < a.size(); i++) {
> System.out.println(a.get(i));
> }
>
> for (Iterator<String> iter = a.iterator(); iter.hasNext();) {
> System.out.println(iter.next());
> }
>
> Regards
> Neil Meyer
>
> -----Original Message-----
> From: Frank W. Zammetti [mailto:fzlists@omnytex.com]
> Sent: 14 March 2006 05:31 PM
> To: Struts Users Mailing List
> Cc: user@struts.apache.org
> Subject: Re: [OT]Struts - AJAX, best solution
>
> On Tue, March 14, 2006 9:32 am, Ashish Kulkarni said:
> > Hi
> > I have a couple of questions below
> > 1 What is the best soluction to have struts and AJAX
> > work together?
> > I have read about DWR, Java Web parts, AjaxAnywhere,
> > But which is the good one, and why?
>
> Well, of course I'm going to say AjaxTags in Java Web Parts :) I think it
> is unique among AJAX solutions at this time because it is almost entirely
> declarative. There is (in most cases) zero client-side code to write, yet
> it also offers a great deal of extensibility to make it even more
> powerful. This makes it, I think, attractive to many people, those that
> don't quite have the client-side skill but have a ton of server-side
> skill. It can in essence grow with your Javascript skills.
>
> However, I will say that I recently used DWR for a project and I totally
> love it! It's very clean, very easy (*IF* you have some Javascript
> knowledge) and really, in my experience, works very well. It also offers
> some ready-made integration with popular libraries like Struts, Spring and
> Hibernate. I have no problem at all recommending DWR (I liked it so much
> that I'm hoping at some point I can contribute to it).
>
> (FYI, because of the extensibility AjaxTags in JWP offers, I'm thinking of
> writing a handler to integrate with DWR, so you'll be able to use it, to a
> limited degree at least, in the same declarative fashion).
>
> Dojo also gets a lot of rave reviews, as does Scriptaculous. I think it
> all depends on what your looking to accomplish... DWR and JWP are a bit
> more low-level than some of the others... for instance, they don't offer
> widgets and such. If your after some of the more high-level things like
> widgets and special effects and such, Dojo and Scriptaculous are
> definitely worth exploring.
>
> > 2 What is better for response XML file or comman
> > delimeted string, or build HTML in action class and
> > pass it to java script to replace it.
>
> Very much depends on what your doing. I will say that contrary to the X
> in AJAX, my experience has been that people tend to NOT use XML at all.
> XML parsing on the client is a somewhat expensive operation, so certainly
> if your returning more than a small chunk of XML, you might want to
> consider if XML is the best choice. In the end though, it depends on what
> your returning.
>
> (FYI: I'm not sure this is common knowledge, but I wrote a client-side
> implenentation of Commons Digester, which can be found in Java Web Parts.
> It doesn't offer the full Digester capabilities of course, but if you like
> Digester for XML parsing, as I do, you may want to have a look).
>
> > 3 Also if i have my own java script to do Ajax
> > what do i return in Action class, normally in action
> > class i do
> > mapping.findForward("success"); after loading the
> > form, this will redirect response to the required JSP.
> > How does this change in AJAX, how do i reload only
> > part of JSP.
>
> You can do one of two things... first, you can render the entire response
> in your Action, and then return null. This tells Struts that teh response
> is fully formed and no forward/redirect is required.
>
> Alternatively, and again I'm not so sure this is common knowledge, you can
> simply forward to a JSP like always and allow IT to render the AJAX
> response. For instance, if your rendering some XML, how easy is that to
> do with JSTL and Struts tags? Pretty easy! No need to write a bunch of
> out.println's in an Action, just use a JSP! The client doesn't know how
> the response was generated, it just takes the response as-is.
>
> Hope that helps!
>
> Frank
>
> --
> Frank W. Zammetti
> Founder and Chief Software Architect
> Omnytex Technologies
> http://www.omnytex.com
> AIM: fzammetti
> Yahoo: fzammetti
> MSN: fzammetti@hotmail.com
> Java Web Parts -
> http://javawebparts.sourceforge.net
> Supplying the wheel, so you don't have to reinvent it!
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
Re: [OT]
Posted by Jonathan Revusky <re...@wanadoo.es>.
Neil Meyer wrote:
> Hi All,
>
> This ons is off topic again.
>
> When I loop for an arraylist I normally use the the first option as it seems
> to me that it will execute the quickest. I know supposedly I should use the
> foreach loop.
>
> All that I want to do is go through the list no adding new elements or
> anything.
>
> Am I correct to say that the first option is best in this case?
>
>
> for (int i = 0; i < a.size(); i++) {
> System.out.println(a.get(i));
> }
The above is very slighly faster for an ArrayList object but the code
only works if a is a list.
>
> for (Iterator<String> iter = a.iterator(); iter.hasNext();) {
> System.out.println(iter.next());
> }
In JDK 1.5 at least, the preferred way to write the above is:
for (String s : a) {
System.out.println(s);
}
It is very clean. Writing the loop this way has the least points of
(human) failure. It works for any a as long it is a Collection
objection. (And your own custom objects as long as they implement
java.util.Iterable.)
HTH,
Jonathan Revusky
--
lead developer, FreeMarker project, http://freemarker.org/
>
> Regards
> Neil Meyer
>
> -----Original Message-----
> From: Frank W. Zammetti [mailto:fzlists@omnytex.com]
> Sent: 14 March 2006 05:31 PM
> To: Struts Users Mailing List
> Cc: user@struts.apache.org
> Subject: Re: [OT]Struts - AJAX, best solution
>
> On Tue, March 14, 2006 9:32 am, Ashish Kulkarni said:
>
>>Hi
>>I have a couple of questions below
>>1 What is the best soluction to have struts and AJAX
>>work together?
>>I have read about DWR, Java Web parts, AjaxAnywhere,
>>But which is the good one, and why?
>
>
> Well, of course I'm going to say AjaxTags in Java Web Parts :) I think it
> is unique among AJAX solutions at this time because it is almost entirely
> declarative. There is (in most cases) zero client-side code to write, yet
> it also offers a great deal of extensibility to make it even more
> powerful. This makes it, I think, attractive to many people, those that
> don't quite have the client-side skill but have a ton of server-side
> skill. It can in essence grow with your Javascript skills.
>
> However, I will say that I recently used DWR for a project and I totally
> love it! It's very clean, very easy (*IF* you have some Javascript
> knowledge) and really, in my experience, works very well. It also offers
> some ready-made integration with popular libraries like Struts, Spring and
> Hibernate. I have no problem at all recommending DWR (I liked it so much
> that I'm hoping at some point I can contribute to it).
>
> (FYI, because of the extensibility AjaxTags in JWP offers, I'm thinking of
> writing a handler to integrate with DWR, so you'll be able to use it, to a
> limited degree at least, in the same declarative fashion).
>
> Dojo also gets a lot of rave reviews, as does Scriptaculous. I think it
> all depends on what your looking to accomplish... DWR and JWP are a bit
> more low-level than some of the others... for instance, they don't offer
> widgets and such. If your after some of the more high-level things like
> widgets and special effects and such, Dojo and Scriptaculous are
> definitely worth exploring.
>
>
>>2 What is better for response XML file or comman
>>delimeted string, or build HTML in action class and
>>pass it to java script to replace it.
>
>
> Very much depends on what your doing. I will say that contrary to the X
> in AJAX, my experience has been that people tend to NOT use XML at all.
> XML parsing on the client is a somewhat expensive operation, so certainly
> if your returning more than a small chunk of XML, you might want to
> consider if XML is the best choice. In the end though, it depends on what
> your returning.
>
> (FYI: I'm not sure this is common knowledge, but I wrote a client-side
> implenentation of Commons Digester, which can be found in Java Web Parts.
> It doesn't offer the full Digester capabilities of course, but if you like
> Digester for XML parsing, as I do, you may want to have a look).
>
>
>>3 Also if i have my own java script to do Ajax
>>what do i return in Action class, normally in action
>>class i do
>>mapping.findForward("success"); after loading the
>>form, this will redirect response to the required JSP.
>>How does this change in AJAX, how do i reload only
>>part of JSP.
>
>
> You can do one of two things... first, you can render the entire response
> in your Action, and then return null. This tells Struts that teh response
> is fully formed and no forward/redirect is required.
>
> Alternatively, and again I'm not so sure this is common knowledge, you can
> simply forward to a JSP like always and allow IT to render the AJAX
> response. For instance, if your rendering some XML, how easy is that to
> do with JSTL and Struts tags? Pretty easy! No need to write a bunch of
> out.println's in an Action, just use a JSP! The client doesn't know how
> the response was generated, it just takes the response as-is.
>
> Hope that helps!
>
> Frank
>
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