Programming practice issues

hi,
i'm now working on a project that requires me to create an UI with Swing...but before i start to actually code anything...i have a small question...it is sort of a programming practice/convention question...
my project has 2 major interfaces (or i should say 2 major "main windows" kind of thing)...the concept is...when the application runs...it first pops up a simple dialog box (could be a simple JFrame with 2 buttons)...the 2 buttons decide which of the 2 "main windows" you want to launch...let's say the 2 "main windows" are called interfaceA.java and interfaceB.java...
my thinking is...i should create a file called launcher.java which contains just a JFrame with the 2 necessary buttons...and by clicking 1 of the buttons would launch the indicated "main window" (interfaceA or interfaceB)...
i'm not exactly sure whether this approach is correct...because for most cases...i'd probably be writing a single "main window" and all other features like dialog boxes, menus, buttons, etc will be built on top of that main window...so the "centre" is the 1 "main window"...however...for my case...it seems to me that there'd no longer be any "centre"...the "centre" now seems to be just that simple JFrame and everything is building on top or spreading out of that JFrame...
is this a correct approach...?
thank you very much!

Are these two "major interfaces" connected to each
other at all? Will the user be able to switch from
one to the other, and is he at all likely to do so?
If not, then what you have is two applications, and
each should have its own entry point. They may just
be two shortcuts to the same program but with
different command-line arguments, but the user
doesn't need to be aware of that. Having them share
the same entry point is like setting the user up for
an ambush ("But what program did you really
want to run?").
Is the user much more likely to choose one interface
over the other (e.g., "Play Game" or "Change
Settings")? If so, then start the more likely one
while providing the means to suspend or quit it and
start the other.
Finally, if there's no way for you to decide
which interface should be the default, maybe the user
can. In that case, go ahead and show that dialog the
first time your app runs, but put a "Set as default"
checkbox on it.
</rant>hi uncle_alice,
thanks for your reply...you've definitely mentioned something meaningful...but my situation is a little bit different from the scenarios you talked about...
maybe i should have been a bit clearer when i first posted my question...in fact...there're 2 "major interfaces" in my project as i've said...and i would say that both interfaces are of almost equal likeliness to be used...
here is a scenario the decribes my project...there's a computer in a kindergarten library that would be used by either a 4-year-old kid or an adult kindergarten teacher to search for books...the interface will be different for the 2 kinds of user...for the kid one...it would be an interface with some graphics and large buttons...for the adult one...it would just be an ordinary book searching utility...
and now...what i want to do is to have a "launcher" that let the user to choose between the "kid interface" and the "adult interface"...there would be chances that a teacher would like to switch to the "kid interface" and browse around...what i planned to do is to have a "log out" button in both interfaces such that at any time if "log out" is clicked...the current interface will be dismissed and the "launcher" pops back again...

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AJ-Phil wrote:
Hi,
This is a question about Good programming practices for creating Iterator objects of ArrayList objects. The following line of code works fine in my program (as ridiculous as it may sound):
        Iterator cheesesIterator = cheeses.iterator();but I was wondering whether Java is automatically inserting the <Type> and new code to make:
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iterator() is just a method that returns an iterator. It constructs an instance of a private or nested class that implements iterator, and returns a reference to it.
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Separate from that is your declaration of that variable as type Iterator, rather than Iterator<String>. Regardless of what you declare on the LHS, the iterator() method returns Iterator<T>. Your bare Iterator is essentially Iterator<Object> or Iterator<? extends Object> (not sure which, or what the difference is), which is assignment compatible with Iterator<T>. If you had declared it Iterator<String>, you wouldn't have to cast after calling next().
Edited by: jverd on Nov 23, 2008 11:33 AM

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Message was edited by: macjack

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total 2 24.83 45.67 145127 695479 602714 560730
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total 3 4.99 4.88 58315 61770 0 1
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Parsing user id: 70 (recursive depth: 1)
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1 SORT AGGREGATE (cr=61770 pr=58315 pw=0 time=4887337 us)
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---------------------------------------- Waited ---------- ------------
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Misses in library cache during parse: 0
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(B.FLEX_VALUE)) = TRIM(UPPER (:B1 )) AND B.ENABLED_FLAG = 'Y' AND UPPER
(B.VALUE_CATEGORY) = UPPER ('SLCHR_INTERFACE_CLEANUP')
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 2 0.00 0.00 0 0 0 0
Fetch 2 0.25 0.86 1640 3286 0 2
total 5 0.25 0.86 1640 3286 0 2
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 70 (recursive depth: 1)
Rows Row Source Operation
2 NESTED LOOPS (cr=3286 pr=1640 pw=0 time=866461 us)
2 TABLE ACCESS FULL FND_FLEX_VALUES (cr=3280 pr=1637 pw=0 time=848331 us)
2 TABLE ACCESS BY INDEX ROWID FND_FLEX_VALUES_TL (cr=6 pr=3 pw=0 time=18101 us)
2 INDEX UNIQUE SCAN FND_FLEX_VALUES_TL_U1 (cr=4 pr=2 pw=0 time=9705 us)(object id 849241)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
db file sequential read 4 0.00 0.02
db file scattered read 208 0.30 0.71
SELECT PHASE_CODE, STATUS_CODE, COMPLETION_TEXT, PHASE.LOOKUP_CODE,
STATUS.LOOKUP_CODE, PHASE.MEANING, STATUS.MEANING
FROM
FND_CONCURRENT_REQUESTS R, FND_CONCURRENT_PROGRAMS P, FND_LOOKUPS PHASE,
FND_LOOKUPS STATUS WHERE PHASE.LOOKUP_TYPE = :B3 AND PHASE.LOOKUP_CODE =
DECODE(STATUS.LOOKUP_CODE, 'H', 'I', 'S', 'I', 'U', 'I', 'M', 'I',
R.PHASE_CODE) AND STATUS.LOOKUP_TYPE = :B2 AND STATUS.LOOKUP_CODE =
DECODE(R.PHASE_CODE, 'P', DECODE(R.HOLD_FLAG, 'Y', 'H',
DECODE(P.ENABLED_FLAG, 'N', 'U', DECODE(SIGN(R.REQUESTED_START_DATE -
SYSDATE),1,'P', R.STATUS_CODE))), 'R', DECODE(R.HOLD_FLAG, 'Y', 'S',
DECODE(R.STATUS_CODE, 'Q', 'B', 'I', 'B', R.STATUS_CODE)), R.STATUS_CODE)
AND (R.CONCURRENT_PROGRAM_ID = P.CONCURRENT_PROGRAM_ID AND
R.PROGRAM_APPLICATION_ID= P.APPLICATION_ID ) AND REQUEST_ID = :B1
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 971 0.25 0.16 0 0 0 0
Fetch 971 0.53 0.65 0 13605 0 971
total 1943 0.78 0.81 0 13605 0 971
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 70 (recursive depth: 1)
Rows Row Source Operation
971 TABLE ACCESS BY INDEX ROWID FND_LOOKUP_VALUES (cr=17489 pr=0 pw=0 time=877481 us)
2913 NESTED LOOPS (cr=16518 pr=0 pw=0 time=1643550 us)
971 NESTED LOOPS (cr=11663 pr=0 pw=0 time=658551 us)
971 NESTED LOOPS (cr=5837 pr=0 pw=0 time=95374 us)
971 TABLE ACCESS BY INDEX ROWID FND_CONCURRENT_REQUESTS (cr=2924 pr=0 pw=0 time=63054 us)
971 INDEX UNIQUE SCAN FND_CONCURRENT_REQUESTS_U1 (cr=1953 pr=0 pw=0 time=43874 us)(object id 240792)
971 TABLE ACCESS BY INDEX ROWID FND_CONCURRENT_PROGRAMS (cr=2913 pr=0 pw=0 time=28198 us)
971 INDEX UNIQUE SCAN FND_CONCURRENT_PROGRAMS_U1 (cr=1942 pr=0 pw=0 time=17956 us)(object id 849182)
971 TABLE ACCESS BY INDEX ROWID FND_LOOKUP_VALUES (cr=5826 pr=0 pw=0 time=558105 us)
971 INDEX RANGE SCAN FND_LOOKUP_VALUES_U1 (cr=4855 pr=0 pw=0 time=539171 us)(object id 906518)
971 INDEX RANGE SCAN FND_LOOKUP_VALUES_U1 (cr=4855 pr=0 pw=0 time=172115 us)(object id 906518)
SELECT MAX(LT.SECURITY_GROUP_ID)
FROM
FND_LOOKUP_TYPES LT WHERE LT.VIEW_APPLICATION_ID = :B2 AND LT.LOOKUP_TYPE =
:B1 AND LT.SECURITY_GROUP_ID IN (0,
TO_NUMBER(DECODE(SUBSTRB(USERENV('CLIENT_INFO'),55,1), ' ', '0', NULL, '0',
SUBSTRB(USERENV('CLIENT_INFO'),55,10))))
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1945 0.11 0.11 0 0 0 0
Fetch 1945 0.18 0.10 0 3890 0 1945
total 3891 0.29 0.21 0 3890 0 1945
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 70 (recursive depth: 1)
Rows Row Source Operation
1945 SORT AGGREGATE (cr=3890 pr=0 pw=0 time=142954 us)
1945 FIRST ROW (cr=3890 pr=0 pw=0 time=96520 us)
1945 INDEX RANGE SCAN (MIN/MAX) FND_LOOKUP_TYPES_U1 (cr=3890 pr=0 pw=0 time=89938 us)(object id 906517)
INSERT INTO HRAPPS.SLC_HRINF_INT_SUMMARY (INT_SUMMARY_ID,
INT_SUMMARY_CREATE_DATE ,INT_SUMMARY_LAST_UPDATE_DATE, INTERFACE_NAME ,
HANDLER_CONC_REQUEST_ID, INT_CONC_REQUEST_ID ,SET_SEQUENCE_NUMBER,
SET_RECORD_COUNT, INT_FROM_DATE ,INT_TO_DATE, INT_STATUS_1_STATE,
INT_STATUS_1_MESSAGE ,INT_STATUS_1_STARTED, INT_STATUS_1_COMPLETED ,
INT_STATUS_1_SUCCESS_COUNT, INT_STATUS_1_ERROR_COUNT ,INT_STATUS_2_STATE,
INT_STATUS_2_MESSAGE ,INT_STATUS_2_STARTED, INT_STATUS_2_COMPLETED ,
INT_STATUS_2_SUCCESS_COUNT, INT_STATUS_2_ERROR_COUNT ,INT_STATUS_3_STATE,
INT_STATUS_3_MESSAGE ,INT_STATUS_3_STARTED, INT_STATUS_3_COMPLETED ,
INT_STATUS_3_SUCCESS_COUNT, INT_STATUS_3_ERROR_COUNT ,INT_STATUS_4_STATE,
INT_STATUS_4_MESSAGE ,INT_STATUS_4_STARTED, INT_STATUS_4_COMPLETED ,
INT_STATUS_4_SUCCESS_COUNT, INT_STATUS_4_ERROR_COUNT ,INT_STATUS_5_STATE,
INT_STATUS_5_MESSAGE ,INT_STATUS_5_STARTED, INT_STATUS_5_COMPLETED ,
INT_STATUS_5_SUCCESS_COUNT, INT_STATUS_5_ERROR_COUNT )
VALUES
(:B7 , :B6 , :B6 , :B5 , :B4 , NULL , NULL, NULL, :B3 , :B2 , :B1 , NULL ,
NULL, NULL , NULL, NULL , :B1 , NULL , NULL, NULL , NULL, NULL , :B1 , NULL
, NULL, NULL , NULL, NULL , :B1 , NULL , NULL, NULL , NULL, NULL , :B1 ,
NULL , NULL, NULL , NULL, NULL )
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.01 0.12 12 1 12 1
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.01 0.12 12 1 12 1
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 70 (recursive depth: 1)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
db file sequential read 12 0.02 0.12
Thanks & Regards,
Rup

Hi;
Please check our previous topic
Concurrent manager real time tune
Oracle apps database
tune concurrent manager
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Concurrent Manager very slow
Concurrent Manager very slow........
Regard
Helios

WRITEQUERY program output issue..

hi,
we are using writequery program for one of our apps. when using writequery prg. the description is not displalyed completly in the output, but displays properly in BEx query output. Any thoughts on this issue..we have to use writequery for our app..
thanks

Hi,
Create a Background job schedule it will runs in background automatically it will creates a spool.
To Create Background job schedule T-Code SM36
To Execute the Background job schedule T-code SM37
To see the spool T-code is SP01.
Thanks
Ganesh

Examples for good programming practice with multiple DAQmx tasks

I'm writing a program to continuously log data from 8 counters, 8 encoders, and 8 voltages. The proof of concept VI with a single counter was simple and elegant, but scaling up to all signals resulted in a wiring mess. I've been working through the Labview Core courses, and am currently on Core 3. I still haven't come across a discussion on how to work with multiple DAQmx tasks without making a mess of the block diagram. Can anyone point me in the right direction?
Also, say I have a state machine that has a configure, idle, and logging states. I need to set the initial values of the encoders during configuration, and keep up with their changes while in the idle state so I have appropriate starting values when entering the logging state. Can anyone point to an example that shows how this might be accomplished?
Thanks

I'm very familiar with AE's/Functional Globals - but I have struggled in the past with handling multiple DAQmx tasks - particularly when you're using multiple devices and using different types of measurements which require seperate tasks/handling (e.g. such as thermocouples which require extra compensation).
I'm not even sure I know whare the requirements are for needing multiple tasks - I know you can need multiple tasks for a single device if the type of measurement is different but can you share an Analogue Input task amongst multiple devices?
I think in hindsight (and without too much thought now) it looks like a good case for Object Oriented LabVIEW - with a base DAQmx class (initialise, configure, start, acquire, stop, close etc.) and then child classes for each type of measurement (with one task associated with each - and private data unique to that specific class). You then hold an array of objects (one for each task) and iterate through each one with dynamic despatch to get the data.
I don't know your particular experience level of using LabVIEW (and as such, OO may not be appropriate) - but as a wider discussion of 'best practice' it seems like an appropriate method I would use going forward.
Certified LabVIEW Architect, Certified TestStand Developer
NI Days (and A&DF): 2010, 2011, 2013, 2014
NI Week: 2012, 2014
Knowledgeable in all things Giant Tetris and WebSockets

General programming practice question (possibly re: clusters)

I apologize for this probably being an old topic or something I should have found elsewhere, but I simply didn't know what to search for.
I am tackling my first labview program of significant scale, and quickly discovering that the difficulty of wiring scales exponentially with the number of things you're trying to do. I marvel at the short and sweet pieces of code people post on here, and try my hardest to replicate the style to no avail.
If I've missed a good guide for good organizational practices when programming, please point the way!
Essentially, I'm grabbing info from a video signal via a daq card, using this to compute the location of objects in the video, and sending instructions to a robot to control its movement-- this means I have the image wires, serial wires, integer wires for pixel values, real wires for coordinates coordinates, and error wires flying around. It's not an extraordinary amount of data but it seems to be an extraordinary amount of scooting things around to make things look pretty and/or readable, every time I make a change.
Clearly use of subVIs is the way to go for each of the tasks, but I still have several pieces of data that need to be communicated from each task to the next.
Is it common practice to cluster the data even if it's unrelated, just to simplify the wiring? Is there significant overhead if you're unclustering and re-clustering it in each subVI? (I tried to write a quick benchmark program but I couldn't quite figure out how to use the profiler)
Any general veteran tips would be much appreciated!

Check out the following links: -
http://www.bloomy.com/resources/index.php#pres
Specifically here the Powerpoint presentations (five_techniques_for_better_labview_code.pps)
Some additional pointers/ resources below: -
http://forums.ni.com/ni/board/message?board.id=LVETF&message.id=1
http://zone.ni.com/devzone/cda/tut/p/id/4434
http://openg.org/tiki/tiki-index.php?page=Style%20Guide
There is a host of other information out there as well, try Google and use the term 'LabView style guide'.
Hope this helps put you on the right track.

AP Computer Programming Practice Exam

I am in Advanced Placement Computer Programming 12, a High school Java Class. My teacher is actually the AIT teacher, and the visual basic teacher, and does not seem to know much about Java since he cannot answer most of my questions. I was given a textbook and told to learn, because the teacher teaches us and the normal Computer Programming students (Visual Basic) at the same time, and they are more important. However, we do pass in assignments to him.
He has been marking me down for forgetting the date in the comments, for forgetting to name my variables with a type (double dblVarName, instead of my way, varName), not enough whitespace, etc. Is this even allowed? It is not in the textbook. I should also mention I have been programming for 4 years and I know 16 languages including C++, but my specialty is PHP, so I code WAY differently then him, and lose points because of my style.
All of my programs to work EXACTLY as the book shows they should. I do an exam for him and the official college level exam, so i don't know what to do. I should also mention that half of the people have failed HIS exam in the last 4 years, and all of them except 2 have failed the College Level Exam. My Physics teacher who is a programmer told me to download the practice exam for the College Level one, so I was wondering where to find it, any ideas?

Guardian-Mage wrote:
He has been marking me down for forgetting the date in the comments, for forgetting to name my variables with a type (double dblVarName, instead of my way, varName), not enough whitespace, etc. Is this even allowed?Obviously it is... quit complaining and do it right. You're going to have to please someone with your coding style no matter what you do.
It is not in the textbook. I should also mention I have been programming for 4 years...Congratulations, before I went to college I had programmed for at least that long and so had most of the people I was in college with.
and I know 16 languages including C++, but my specialty is PHP, ...in something like 8 different languages not including various dialects of assemblers... and that was back in the day before dinosaurs roamed the earth (before the internet and these things they call scripting languages).
so I code WAY differently then him, and lose points because of my style. Get over it and learn to do it the way the shop wants. It just sounds in this case both of you have a rather large case of themselves. You are going to be required to accept some standards in your programming career--even in college there is some discretionary points given for style--yes, white space, variable naming, the number of lines in your code, readability and etc. (I'm not saying he has the end all of styles or what he is requiring is correct, but he is the one you have to please right now with your style--it rather foolish not to--he's the one with the grade book.)
Getting a program to work it only part of the desired result, it's about time you learned that. You have to be able to cut easily readable, easily maintainable, highly cohesive, correct code. Yes, pretty print actually counts in the real world too. Decide to do it right now and you'll be a lot better off later on.
When you get to college you're going to find one thing: everyone is going to be the top of their class... AP placement... programmed for X years... knows XX languages... etc. You're finding that just getting it to work is not the end all of the problem. DO IT RIGHT, and learn what your instructor is trying to teach you... get some style that you can be proud to show in a job interview instead of what you are doing now.
BTW: I had a very similar attitude going into college, and shock of my life... everyone was the top of their HS programming classes. This was driving home to me in my Senior year in a Systems Programming class that was taught by the CS Department Chair. He stood up in front of the class and faced us very solumn faced and sternly asked: "Who here thinks they are gifted?"
I raised my hand and he looked at the others and siad: "What's the matter with the rest of you? You are the top 2%, if you're not gifted who is?"

Learning java programing - Array issues.

Hi Everyone,
I just started in java programming and into Arrays multidimensional. I started a simple 2 dimensional array with 5 names with genders. I 'm having issues because it does not want to print out the names with correct genders Male/ Female. The simple program should print out the 5 names with gender type.
example:
Jack - Male
Sally - Female
Dave - Male
Sue - Female
Brian - Male
Here is what I came up with so far:
public class Multiname
     public static void main(String[] args)
          //String[][] multiname;
          String [][] multiname =
                    {"Jack", "sally"},
                    {"Dave", "Brian"},
                    {"Sue"}
          /* multiname [0][0] = "Jack";
          multiname [0][1] = "Male";
          multiname [1][0] = "Sally";
          multiname [1][1] = "Female";
          multiname [2][0] = "Dave";
          multiname [2][1] = "Male";
          multiname [3][0] = "Sue";
          multiname [3][1] = "Female";
          multiname [4][0] = "Brain";
          multiname [4][1] = "Male";
          //int rows = 2;
     //int columns = 2;
               for(int i = 0; i < 4; i++)
                    {for(int j = 0; j < 2; j++)
                            System.out.println("multiname " + ": " + multiname [i][j]);
This is the result:
multiname : Jack
multiname : sally
multiname : Dave
multiname : Brian
multiname : Sue
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
     at MultiD.main(MultiD.java:29)
Can someone inform me what is wrong or missing, and what do I need to do to correct this. I'm new to this and I'm a visual person. Any assistance would be appreciated.
Thanks,

Welcome to the forum!
When you post code use \ on the line before and on the line after the code to preserve formatting (read the FAQ). You can use the 'Preview' tab on the reply window to see what your reply will look like.
Please edit your post and add the code tags.
{quote}
The simple program should print out the 5 names with gender
{quote}
How could it possibly do that when you commented out the lines the put the gender into the arrays?/* multiname [0][0] = "Jack";
multiname [0][1] = "Male";
multiname [1][0] = "Sally";
multiname [1][1] = "Female";
multiname [2][0] = "Dave";
multiname [2][1] = "Male";
multiname [3][0] = "Sue";
multiname [3][1] = "Female";
multiname [4][0] = "Brain";
multiname [4][1] = "Male";
When you are starting out don't use any more data than you need to get things working. You only need two name/gender combinations; any more just gets in the way.

Programming practice issues

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