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Groups > comp.lang.java.programmer > #24436
| Date | 2013-06-17 14:46 +0100 |
|---|---|
| From | lipska the kat <"nospam at neversurrender dot co dot uk"> |
| Organization | Trollbusters 3 |
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: About java program. |
| References | <324f929f-772e-4004-81e1-6b454cdae794@googlegroups.com> <b24an6FlpvpU1@mid.individual.net> <UoednTl5R618JiDMnZ2dnUVZ8iadnZ2d@bt.com> <b263siF2vkkU1@mid.individual.net> <uBDvt.60965$5i1.39234@newsfe15.iad> |
| Message-ID | <ILKdnZ-vg53OjiLMnZ2dnUVZ7tmdnZ2d@bt.com> (permalink) |
On 17/06/13 13:49, Arved Sandstrom wrote:
> On 06/16/2013 12:28 PM, Robert Klemme wrote:
>> On 16.06.2013 15:21, lipska the kat wrote:
>>> On 16/06/13 00:12, Robert Klemme wrote:
>>>> On 15.06.2013 22:38, rajbhaumik@gmail.com wrote:
>>>>> import acm.program.*;
>>>>> public class askYesNoQuestion extends ConsoleProgram {
>>>>> public void run(){
>>>>> String str=readLine("Would you like instructions");
>>>>> println(askYesNoquestion(str));
>>>>> }
>>>>> 7. private boolean askYesNoquestion (String str){
>>>>> if(str.equals("yes"))return true;
>>>>> if(str.equals("no")) return false;
>>>>> }
>>>>>
>>>>> }
>>>>> the false is that , the program cannot be executed, because no 7
>>>>> said, this method must return a type of boolean.
>>>>
>>>
>>> One possible solution (not compiled or tested)
>>>
>>> private boolean askYesNoquestion (String str){
>>> boolean response = false;
>>> if(str.equals("yes")){
>>> response = true;
>>> }
>>> return response;
>>> }
[snip]
> To the original point, I agree to an extent. But the actual idiom that
> lipska used is not bad in general, if you're used to single return. It's
> sort of like *always* providing braces for conditionals, even for one
> liners, defensive coding in part, but also adhering to personal coding
> style.
... and what is your opinion of defensive coding?
Anyone who has ever written software to interact with a user via a
device interface knows (or should know) that defensive coding is de-riguer.
If you don't want the device to crash every time someone does something
unexpected you need to anticipate no only the unexpected but the
unanticipated. There is *no* room for error.
This discipline is hard to learn and once learned even harder to
un-learn. This is why I don't like things like
return str.equals("yes");
It's lazy coding and harder to understand than my example and yes, I
realize that it's only a one liner but the next stage in the
'development' of this style is
if(something){
return something;
}
else if(something else){
return something else;
}
else{
return some other value
}
It is much easier to understand and debug
the following
type var;
if(something){
var = something;
}
else if(something else){
var = something else;
}
else{
var = some other value
}
return var;
If I was doing a proper job and not just providing a simple example I
would have had a pre-condition on the method *and* exception handling
*and* braces around every conditional, even one liners,
*and* a fallback position if the operation was mission critical. So yes,
it's my personal style learned from painful experience.
Thank you for understanding
lipska
--
Lipska the Kat©: Troll hunter, sandbox destroyer
and farscape dreamer of Aeryn Sun
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About java program. rajbhaumik@gmail.com - 2013-06-15 13:38 -0700
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-06-15 16:50 -0400
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-06-16 01:12 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-16 14:21 +0100
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-06-16 17:28 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-16 19:52 +0100
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-06-16 15:50 -0400
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-17 09:36 +0100
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-17 09:49 -0300
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-17 14:46 +0100
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-17 13:32 -0300
Re: About java program. Joerg Meier <joergmmeier@arcor.de> - 2013-06-17 20:32 +0200
Re: About java program. Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-06-17 14:49 -0400
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-17 18:38 -0300
Re: About java program. Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-06-17 18:30 -0400
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-18 17:33 -0300
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-04 22:56 -0400
Re: About java program. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-06-18 00:13 +0200
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-18 17:50 -0300
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-19 08:50 +0100
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-19 15:16 -0300
Re: About java program. Lew <lewbloch@gmail.com> - 2013-06-19 16:20 -0700
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-07 13:31 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-07 18:16 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-07 19:21 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-07 20:07 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-07 20:21 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-07 20:40 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-07 22:20 -0400
Re: About java program. Lew <lewbloch@gmail.com> - 2013-07-07 21:47 -0700
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-08 06:58 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-08 08:07 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-08 08:58 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-08 09:18 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-08 09:47 -0400
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-07-08 10:07 -0400
Re: About java program. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-06-19 16:42 +0200
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-20 23:33 -0300
Re: About java program. Martin Gregorie <martin@address-in-sig.invalid> - 2013-06-21 04:16 +0000
Re: About java program. Joerg Meier <joergmmeier@arcor.de> - 2013-06-21 12:27 +0200
Re: About java program. Martin Gregorie <martin@address-in-sig.invalid> - 2013-06-21 21:14 +0000
Re: About java program. Joerg Meier <joergmmeier@arcor.de> - 2013-06-21 23:37 +0200
Re: About java program. Martin Gregorie <martin@address-in-sig.invalid> - 2013-06-21 23:42 +0000
Re: About java program. Gene Wirchenko <genew@telus.net> - 2013-06-24 13:00 -0700
Re: About java program. Martin Gregorie <martin@address-in-sig.invalid> - 2013-06-24 21:29 +0000
Re: About java program. Martin Gregorie <martin@address-in-sig.invalid> - 2013-06-24 21:42 +0000
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-21 23:59 -0300
Re: About java program. Martin Gregorie <martin@address-in-sig.invalid> - 2013-06-22 13:30 +0000
Re: About java program. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-06-21 16:24 +0200
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-21 22:39 -0300
Re: About java program. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-06-22 19:25 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-22 19:41 +0100
Re: About java program. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-06-23 03:53 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-23 09:21 +0100
Re: About java program. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-06-24 18:57 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-24 18:14 +0100
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-22 09:03 +0100
Re: About java program. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2013-06-22 19:26 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-22 18:51 +0100
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-04 22:58 -0400
Re: About java program. Joerg Meier <joergmmeier@arcor.de> - 2013-06-19 00:38 +0200
Re: About java program. Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-06-18 18:56 -0400
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-18 21:26 -0300
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-06-19 21:20 +0200
Re: About java program. Sven Köhler <remove-sven.koehler@gmail.com> - 2013-06-20 11:23 +0300
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-06-20 19:18 +0200
Re: About java program. blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2013-07-15 20:20 +0000
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-19 09:14 +0100
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-19 09:11 +0100
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-04 23:11 -0400
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-07-05 09:13 +0100
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-07-05 23:15 +0200
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-05 22:03 -0400
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-07-06 13:01 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-07-06 13:43 +0100
Re: About java program. Martin Gregorie <martin@address-in-sig.invalid> - 2013-07-06 14:17 +0000
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-06 16:18 -0400
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-07-06 21:42 +0100
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-07-06 09:16 +0100
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-07-06 13:14 +0200
Re: About java program. Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-07-06 08:22 -0400
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-07-07 20:43 +0200
Re: About java program. Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-07-07 18:07 -0400
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-07 19:35 -0400
Re: About java program. Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-07-07 20:42 -0400
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-07-08 20:50 +0200
Re: About java program. Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-07-08 15:01 -0400
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-07-08 23:29 +0200
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-06 16:27 -0400
Re: About java program. Lew <lewbloch@gmail.com> - 2013-07-06 13:41 -0700
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-05 21:59 -0400
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-17 21:06 +0100
Re: About java program. Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2013-06-17 17:36 -0500
Re: About java program. Robert Klemme <shortcutter@googlemail.com> - 2013-06-18 08:24 +0200
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-18 09:03 +0100
Re: About java program. Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2013-06-18 13:07 -0500
Re: About java program. Lew <lewbloch@gmail.com> - 2013-06-18 14:48 -0700
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-19 08:36 +0100
Re: About java program. Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-06-18 23:33 -0300
Re: About java program. lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-06-19 08:34 +0100
Re: About java program. Arne Vajhøj <arne@vajhoej.dk> - 2013-07-04 22:53 -0400
Re: About java program. Roedy Green <see_website@mindprod.com.invalid> - 2013-06-16 07:04 -0700
Re: About java program. Jeff Higgins <jeff@invalid.invalid> - 2013-06-18 04:06 -0400
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