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Groups > comp.lang.java.programmer > #15607
| From | bilsch <bilsch01@gmail.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: I need a different approach - suggestions please |
| Date | 2012-06-26 13:24 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <jsd5p9$pu5$1@dont-email.me> (permalink) |
| References | <jsaos3$bht$1@dont-email.me> <jsarei$tfl$1@dont-email.me> <jsatb2$6ki$1@dont-email.me> <f5a21759-b102-4a8a-b701-c84e52855962@googlegroups.com> |
On 6/25/2012 6:36 PM, Lew wrote:
> bilsch wrote:
>> markspace wrote:
>>> bilsch wrote:
>>>> I'm trying to make a program that works like the calculator in Windows
>>>> Accessories - all input is from button clicks. ...
>>>> Everytime the method is called the string is reinitialized
>>>> with the result that my sequence of digits is only ever one digit long.
>>>> My plan would work if I could initialize the string outside the method,
>>>> however variable scope in Java doesn't allow it.
>>>
>>> First, good job on making a very reasonable SSCCE.
>>>
>>> Second, the trick to Java's scoping rules is to change the rules!
>>>
>>> Move the string strng1 from inside the actionPerformed to outside, right
>>> below the CalcGUIQ1 gui; line. Now Java's scoping rules help you rather
>>> than hinder you.
>>>
>>> BTW, this looks like a homework problem, and it looks like you've been
>>> getting help on it. Some if it is a bit sophisticated for someone who
>>> doesn't understand scoping. Please try to talk to your instructor or a
>>> TA, they need to understand when you're having problems with your lessons.
>>>
>> Thanks for the help. I could swear I tried that first but got error
>> messages about static and non-static conflict problem. i will be taking
>> Java in fall quarter. Right now I'm working from "Learn Java in 24
>> Hours" I thought up the calculator project myself. Thanks again.
>
> There are a few mistakes in your code.
>
> You don't need to call 'super()' in the constructor explicitly.
> That's what happens by default anyway.
>
> You called the constructor directly from the 'main()' routine. That means
> you called it from the primary thread of the program. You don't know this
> yet, probably, unless you've already studied concurrency in Java a little bit.
>
> The problem is that the GUI won't work right if you do that. You have to
> move GUI actions onto the "Event Dispatch Thread" (EDT), a background
> thread that the system creates to handle all GUI actions.
>
> Also, you start all the action from the constructor. That's bad. As its name
> implies, a constructor's purpose is to _construct_ an object, not run its logic.
> Run the logic after construction completes and the instance is no longer in a
> partially-built state.
>
> And make your indentation consistent with the Java coding conventions (available
> on line).
>
> So all together, you'd do something like:
>
> public static void main(String[] arguments) {
> java.awt.EventQueue.invokeAndWait( new Runnable() {
> @Override public void run() {
> CalcGUIQ1 calculator = new CalcGUIQ1();
> calculator.setVisible(true);
> }
> });
> }
Many things are because I mimic what I see in other programs. Your
advise is appreciated and noted. I know my indentation is wrong - it is
something I'll have to work on. I hope I can finish this project without
understanding threads because I read about them and I don't see that
they apply here. I don't really understand them.
Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-25 15:31 -0700
Re: I need a different approach - suggestions please markspace <-@.> - 2012-06-25 16:15 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-25 16:47 -0700
Re: I need a different approach - suggestions please markspace <-@.> - 2012-06-25 18:10 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-26 13:04 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-26 14:01 -0700
Re: I need a different approach - suggestions please Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-06-26 17:21 -0400
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-27 14:44 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-27 14:56 -0700
Re: I need a different approach - suggestions please Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-06-27 18:13 -0400
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-27 18:48 -0700
Re: I need a different approach - suggestions please Patricia Shanahan <pats@acm.org> - 2012-06-27 15:21 -0700
Re: I need a different approach - suggestions please Jail Bush Cronies <do.not@ask.me> - 2012-06-27 18:46 -0400
Re: I need a different approach - suggestions please markspace <-@.> - 2012-06-26 14:25 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 14:32 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-26 17:49 -0400
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 15:20 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-27 17:30 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-27 18:09 -0700
Re: I need a different approach - suggestions please Wanja Gayk <brixomatic@yahoo.com> - 2012-07-02 11:21 +0200
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-25 18:36 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-26 13:24 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 13:49 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-26 14:04 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 14:34 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-26 16:26 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 16:47 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-26 20:04 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-26 22:18 -0400
Re: I need a different approach - suggestions please Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-06-26 22:59 -0400
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-27 21:30 -0400
Re: I need a different approach - suggestions please Wanja Gayk <brixomatic@yahoo.com> - 2012-07-02 11:32 +0200
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-07-02 09:47 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-26 20:06 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-27 11:42 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-27 14:09 -0700
Re: I need a different approach - suggestions please Patricia Shanahan <pats@acm.org> - 2012-06-27 15:11 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-27 21:59 -0400
Re: I need a different approach - suggestions please Devil's Advocate <legal@hell.org> - 2012-06-27 22:17 -0400
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-27 21:40 -0400
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-27 19:12 -0700
Re: I need a different approach - suggestions please Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-06-27 20:47 -0500
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-27 19:12 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-27 21:28 -0400
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-27 19:14 -0700
Re: I need a different approach - suggestions please Hydrangea <hydrangea393@foo.mail.quuzzle.edu> - 2012-06-27 22:28 -0400
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-27 21:05 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-27 22:32 -0400
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-27 21:08 -0700
Re: I need a different approach - suggestions please markspace <-@.> - 2012-06-26 14:10 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 14:35 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-26 17:51 -0400
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 15:20 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-26 19:35 -0400
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-26 16:44 -0700
Re: I need a different approach - suggestions please Arne Vajhøj <arne@vajhoej.dk> - 2012-06-26 22:06 -0400
Re: I need a different approach - suggestions please Patricia Shanahan <pats@acm.org> - 2012-06-27 08:15 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-27 18:36 -0700
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-27 18:54 -0700
Re: I need a different approach - suggestions please B1ll G4tes <wm.gat3s@micro5oft.quux> - 2012-06-27 22:23 -0400
Re: I need a different approach - suggestions please Lew <lewbloch@gmail.com> - 2012-06-28 09:55 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-28 04:02 -0700
Re: I need a different approach - suggestions please Mike Winter <mlwinter@gmail.com> - 2012-06-28 04:55 -0700
Re: I need a different approach - suggestions please markspace <-@.> - 2012-06-28 07:33 -0700
[OT] Message IDs (Re: I need a different approach - suggestions please) Mike Winter <mlwinter@gmail.com> - 2012-06-28 08:45 -0700
Re: [OT] Message IDs (Re: I need a different approach - suggestions please) markspace <-@.> - 2012-06-28 09:39 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-28 09:44 -0700
Re: I need a different approach - suggestions please Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-06-28 12:51 -0400
Re: I need a different approach - suggestions please markspace <-@.> - 2012-06-28 09:58 -0700
Re: I need a different approach - suggestions please markspace <-@.> - 2012-06-28 07:32 -0700
Re: I need a different approach - suggestions please Roedy Green <see_website@mindprod.com.invalid> - 2012-06-26 03:49 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-26 13:59 -0700
Re: I need a different approach - suggestions please Patricia Shanahan <pats@acm.org> - 2012-06-29 08:12 -0700
Re: I need a different approach - suggestions please Gene Wirchenko <genew@ocis.net> - 2012-06-29 10:02 -0700
Re: I need a different approach - suggestions please bilsch <bilsch01@gmail.com> - 2012-06-29 13:07 -0700
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