While Loop - Object Creation

Hello,
I have a question on object creation and while loops. Have a look at the following code snippet:
while(true)
       Object obj = new Object();
       // Pass off obj to a new thread
       Thread job = new Thread(new ObjectHandler(obj));
       job.start();
}My question is, do I have to wait until the newly created Thread is finished with the Object obj before I can create a new Object called obj in the while loop?
Also does anyone have any documentation on this sort of thing?
Thanks,
Tony.

Jaxie wrote:
I'm still not sure you get what I'm on about, you might want to read up on java methods and pass by value.I think we know how it works. Most of us have been programming in Java for serveral years.
>
When you pass an object to a method in java you pass it a copy of a reference to that object. Leading on from that, before an object is eligible for garbage collection in java, all references to that object must be dropped.
So with all that in place, my question was, is the creation of an object in a while loop dependent on previous objects of the same name? Objects don't have names. Have we mentioned that before?
You have a reference, larry that is referencing an unnamed object. You can also create other references that reference the same object. The thread will have one reference. You can then make larry reference another object. That will not change anything in the thread. It will still reference the old object, and that object will not be claimed by the gc until that thread stops referencing it.
So the second time we go through the loop below, do we have to wait until larry has been garbage collected, before a new larry can be created?Read the articles/tutorials and what I have written above. What do you think?
Do also note that the GC isn't executed synchronously.

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Hi
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Error: "Total length of lock argument for table XXXXXXXXX longer than 150"
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Hi,
I think the error is becoz you have given too many LOCK parameters in the lock object. the total length of the PARAMTERS of lock object should not exceed 150.
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While loop using a timer object

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Hi,
You can use break:
http://ss64.com/ps/break.html
EDIT: Alternatively, you can try this:
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$found = $false
Do {
$file = Test-Path -Path $filePath
If ($file) {
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$found = $true
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Until ($found -eq $true)
This will loop until the file is found instead of relying on a timer.
Don't retire TechNet! -
(Don't give up yet - 12,700+ strong and growing)

What's wrong with this while loop?

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How can i get the while loop to enter a different loop beside the first one

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function Execute-MySQLCommand {param( [string]$Server, #the host name of the SQL server
[string]$DATABASE3, #the name of the database
[System.Data.SqlClient.SqlCommand]$Command) #the command to execute (name of stored procedure)
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$Command.CommandType = 1 # 1 is the 'Text' command type
$Command.Connection = $mysqlConnection
$mysqlConnection.Open()
$Result = $Command.ExecuteNonQuery()
$mysqlConnection.Close()
if ($Result -gt 0) {return $True} else {return $False}
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[System.Data.SqlClient.SqlCommand]$Command) #the command to execute (name of stored procedure)
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$sqlConnection.Open()
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copy $original.FullName -destination $result
cd /d/DATABASE4/code_st
install ../DATABASE0980453.pkg
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[string]$DATABASE1,$DATABASE2,$DATABASE3,$DATABASE4, #the name of the database
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$Command.CommandType = 1 # 1 is the 'Text' command type
$Command.Connection = $sqlConnection
$sqlConnection.Open()
$Result = $Command.ExecuteNonQuery()
$sqlConnection.Close()
if ($Result -gt 0) {return $TRUE} else {return $FALSE}
install ../DATABASE0980453.pkg
While($ProductionDistro -match $Cyc) {
write-host "Sets up location you want to run staging"
$ElementDistro = Read-Host -Prompt "Which Element do you want to run? (DATABASE1/DATABASE2/DATABASE3/DATABASE4/ALL)"
While($ElementDistro -notmatch "(DATABASE1|DATABASE2|DATABASE3|DATABASE4|ALL)") {
write-host "you have enterd an error" -ForgroundColor Red
write-host "You must type DATABASE1 or DATABASE2 or DATABASE3 or DATABASE4 or ALL"
write-host "you typed $ElementDistro"
write-host "set location you want to run staging"
$ElementDistro = Read-Host -Prompt "Which Element do you want to run? (DATABASE1/DATABASE2/DATABASE3/DATABASE4/ALL)"

OK, so you've got a reasonable input loop early on:
write-host "This script sets up DATABASE Staging"
$ProductionDistro = Read-Host -Prompt "Which production do you `enter code here`want to run?(TC/MonsterLock/Cyc)"
While($ProductionDistro -notmatch "^(TC|MonsterLock|Cyc)$"){
write-host "You have entered an error" -ForegroundColor Red
write-host "You must type TC or MonsterLock or Cyc"
write-host "you typed $ProductionDistro"
write-host "This script sets up DATABASE Staging"
$ProductionDistro = Read-Host -Prompt "Which production do you `enter code here`want to run?(TC/MonsterLock/Cyc)"
I've only added two things to that code: a ^ and $ at the beginning and end of your regex pattern. As originally written, it would have successfully matched any string containing TC, MonsterLock or Cyc (such as "bogusTCwhatever", etc).
Now, instead of a bunch of extra While loops based on $ProductionDistro, what you need is some conditionals (either a Switch statement, or some If/ElseIf). For example:
switch ($ProductionDistro)
'TC'
# Do TC Stuff
break
'MonsterLock'
# Do MonsterLock Stuff
break
'Cyc'
# Do Cyc stuff
break

Can't break out of a while loop

Hi, I am doing a networking course, for which an assignment was to write an echo client and server. I did the assignment in Java and it works just fine. However, there is something I don't understand that is bugging me. I wanted a way to stop the server by either detecting when the client entered "quit" or when the user of the server entered "quit". This was not part of the assignment, but after trying many different things I really want to know (1) what I am doing wrong and (2) what the correct way to do things would be.
I tried to put an "if" clause within the while loop so that if the client entered "quit" the server would detect that, close the socket connections, and break the while loop. But... it seems that I have done this wrong and I am not sure why.
(Note - I am not a Java programer - just a beginner, and the course in question isn't a programming course. I did the program below by following some brief guidelines/tutorial. I don't even have any books on Java to consult right now - just ordered few from Amazon for any future projects.)
The code:
// EchoServer.java     - a simple server program. It listens on a predetermined port for an incoming connection.
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//                the server will echo the exact same line back.
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import java.net.*;
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               input = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
               output = new PrintWriter(clientSocket.getOutputStream(), true);
          } catch (IOException e) {
               System.out.println(e);
          String theLine;
          while(true){
               theLine = input.readLine();
               output.println(theLine);
               output.flush();
                    if (theLine.equals("quit")) {
                         input.close();
                         output.close();
                         clientSocket.close();
                         myServer.close();
                         break;
                    }     // end if
          }     // end while
     }     // end main
}          // end EchoClient

A few observations:
- You might as well exit after you have caught your exceptions, since none of the conditions I see would allow your program to run properly afterwards. You can either do that by a System.exit(int) or a return;
- Although this s an example program, you should take advantage of doing things right. Addining a try-finally would be good for tidying things up. First declare your variables before the main try, otherwise the finally won't be able to do its job. For example (this won't compile as is):
Socket clientSocket = null;
ServerSocket myServer = null;
InputStream in = null;
OutputStream out =null;
try {
String theLine = null;
while( (theLine = input.readLine()) != null ){
    output.println(theLine);
    output.flush();
    if (theLine.equals("quit")) {
       break;
}     // end while
} catch ( IOException ex ) {
ex.printStackTrace();
} finally {
if ( in != null ) {
     in.close();
if ( out != null ) {
     out.close();
// add other conditions to close other closeable objects
}The reasoning is that if an exception were ever to happen you would be sure that the clean up would be done. In your current example you may risk having an inputstream left open. Also note that BufferedReader.readLine() returns null when its arrived at the end of its content.

While loop problem

I have a problem with a while loop in this code and it is really holding me up doing my degree. I can see nothing wrong with it but perhaps someone here can help. I would be really greatful if someone could. I have commented the line where the while loop starts about a third of the way down the code.
Thanks
Michael
if (ae.getSource()==client_open)
int row=0;
check=true;
row=client_listing.getSelectedRow();
try
System.out.println("information[row][1] is "+information[row][1]);
if(information[row][1]!=null) //if the index is not null. Comment out this if statement to troubleshoot
try
InetAddress inet=InetAddress.getByName(information[row][1]);
//Create a client socket on the listeners machone on port 7070
client_socket=new Socket(inet,7070);
System.out.println("Client port open on 7070 ");
//Get the output as well as the input streams on that socket
BufferedOutputStream out=new BufferedOutputStream(client_socket.getOutputStream());
BufferedInputStream br_socket=new BufferedInputStream(client_socket.getInputStream());
XMLWriter writer=new XMLWriter();
writer.requestFString("SHOWFILES"," ");
String file_data=writer.returnRequest();
byte file_bytes[]=file_data.getBytes();
int file_size=file_bytes.length;
byte b[]=new byte[1024];
// The methos takes a byte array and it's length as parameters and return
// a byte array of length 1024 bytes....
add_on upload=new add_on();
System.out.println("Class of add_on created sucessfully");
b=upload.appropriatelength(file_bytes,file_size);
out.write(b,0,1024);
/*An output stream is also initialised. This is used to store all the response
from the listener */
BufferedOutputStream out_file=new BufferedOutputStream(new FileOutputStream("response.xml"));
int y=0;
byte f[]=new byte[32];
System.out.println("Entering while loop");
//This while loop is not working. Any ideas. It just hangs here
while((y=br_socket.read(f,0,32))>0) //the socket input stream is read
out_file.write(f,0,y); //written on to the file output stream, y bytes from f start @ ofset 0
out.close();
br_socket.close();
out_file.close();
System.out.println("Exited while loop and closed streams");
catch(Exception e)
client_socket=null;
check=false;
System.out.println("Didnt enter try");
try
client_socket.close();
catch(Exception e)
System.out.println("Error occuered "+e.getMessage());
row=0;
if(check) //If the exception occurs then do not come here
Vector parameters=new Vector();
// A class SParser is also used here this class has a function/method of
// the name perform which calls the xml parser to parse the xml file
// generated by the response from the client soket...
// the function perform returns a Vector which has the files/directories,
// along with their flag information and size in case of files....
SParser sp=new SParser();
System.out.println("SParser object created sucessfully");
parameters=sp.perform("response.xml");
System.out.println("Parsing finished ");
// The vector value returned by the xml parseris then passed as one of
// the parameters to a class named file_gui this class is responsible for
// displaying GUI consisting of a table and some buttons along with the
// root information and flag..
// Initially since the class is called for the first time the parameter
// for the root is given the name "ROOT" and the Flag is set to "0"..
file_gui showfiles=new file_gui(parameters,information[row][1],"Root","0");
showfiles.show();
check=false;
} //end if
} // end if
} //end try
catch(Exception e)
row=0;
} //end of ae.getSource()

Why do you think it hangs at the while loop, eh? You need to put in additional printlns to justify your assertion. It takes alot less time to diagnose if you put in specific try/catch blocks with their own printlns - even if it is not as much fun. When you get into these kinds of troubles, there is no shame in putting in prints at each statement or logical point to track down the actual fault.
~Bill

FIM MA Export errors. There is an error executing a web service object creation.

While checking for the permission, we have figured that the Built-In Synchronization account is being deleted by an Expiration Workflow.
FIM MA Export errors. There is an error executing a web service object creation.
While checking for the permission, we have figured that the Built-in Synchronization account was deleted by an Expiration Workflow
Is there a way to restore. Thanks.

I would re-run FIM setup - I think it can re-create this account
If you found my post helpful, please give it a Helpful vote. If it answered your question, remember to mark it as an Answer.

Need help on a while loop

Hi...I am somewhat new to Java and I am trying to do a nested while loop. Basically I have a result set from a query and I want to loop though that result set BUT I need a second loop to put together 150 of the results at a time and add them to a GeoCodeRequest to send to MapInfo.....this is how I think the code should look, I need some advice if it is the proper way to loop through....
ArrayList aal = new ArrayList();
ServiceMessage sm = new ServiceMessage();
ServiceMessage rsm = new ServiceMessage();
while (rset.next())
statRecord = statRecord + currentRecord;
while (rset.next() && currentRecord <= 150)
AddressEx a = new AddressEx(rset.getString(6));
ContentColumn cc = new ContentColumn("mmhid");
cc.setValue(rset.getString(1));
StreetAddress streetAddress = new StreetAddress(rset.getString(3));
streetAddress.setBuildingName(rset.getString(2));
a.setCountrySubdivision(rset.getString(5));
a.setMunicipality(rset.getString(4));
a.setPostalCode(rset.getString(6));
a.setContentColumn(0,cc);
aal.add(a);
currentRecord++;
System.out.println("Inside inner while loop now..");
System.out.println("Add 150 to request...");
GeocodeRequestEx gr = new GeocodeRequestEx("","3.0","id",(AddressEx[])aal.toArray());
gr.setGeocodePreference(pref);
sm.addRequest(gr);
System.out.println("going to geocode now...");
try{
LocationUtilityServiceLocator lus = new LocationUtilityServiceLocator();
LocationUtility lu = lus.getLocationUtility(new URL(url));
XLSType xr = lu.perform(sm.toXLS());
rsm = new ServiceMessage(xr);......
code goes on to do oter things but this is the basis..............
I hope that all made since.....please help.

I am not sure if there is a problem, that is what I am
asking......if I have the logic correct.
I haven't been able to test it correct because I am
getting an:
Exception in thread "main"
java.lang.ClassCastException: [Ljava.lang.Object; at
geoClient.main(geoClient.java:127)
That means you don't have it correct. :-)> on the following line:> > GeocodeRequestEx gr = new> GeocodeRequestEx("","3.0","id",(AddressEx[)aal.toArray
and I haven't figured out to correct that yet......You need to use toArray(Object[]).

Reference in a while loop

If you open references to a LabVIEW object, such as an application,
control, or VI, close the references by using the Close LV Object
Reference function. Otherwise, the reference stays in memory even
though the VI no longer uses it.
The above quote is from Development Guide from NI. I realized that I have been using references without closing them. Even though I have never encountered any problem, I decided to add close reference to my programs. My question is, should I put the reference and close reference vis both in a while loop and open/close every iteration or should I use open reference in front of a while loop and close it after the while loop, this way, I will have to use a shift register to keep the reference. Or whether there are some other options. Can someone give some advice?
Thanks in advance,
Guangde Wang
Solved!
Go to Solution.

The fact that you didn't encounter problems with keeping the refs open is because LabVIEW has some quite good garbage collection.
In the case of a for loop you should use shift registers, because a for loop can run zero (0) times after which you will have a NULL-reference.
Ton
Free Code Capture Tool! Version 2.1.3 with comments, web-upload, back-save and snippets!
Nederlandse LabVIEW user groep www.lvug.nl
My LabVIEW Ideas
LabVIEW, programming like it should be!

Use the LabView time delay in a while loop instead of using the instrument inherent time loop.

I have a zes lmg500 that I use. It has the option of continues measuring data, with a user control cycle loop (still using a while loop but the delay is coming from the instrument). The problem is that the loop time is not constant. Can I use a very short time (100ms) as the instrument cycle time but use a longer time delay in the while loop that collect the data?
I know many instrument offer the same abilities, so the question is relevant to all of them.
Thanks for any help
Solved!
Go to Solution.

Does that measurement VI have built-in wait functionality and a timeout?
If not, then you are simply polling the VI at 1 kHz, but I suspect that this is not the case or your Waveform Chart probably wouldn't look as you expect (getting 0's put in everytime measurement data is not available).
I expect that if you have the instrument set up to send data at a fixed time interval (i.e. 100 ms), all the data that it is sending you will end up residing in your serial buffer (or the instrument driver will have taken it out and put it in another internal buffer), so if you come back to read it 1 sec later, then you will have 10 data points to go through. Whether you can read them all at once with the read VI or have to call it a whole bunch of times until empty I can't say.
What is your objective?

Writing a file for prescribed amount of time in a while loop after the triggering condition is met

Hello Guys,
I am trying to program an application in which if the trigger condition is met it should start to write the file.
I was able to do that, but if I want it to be written for certain amount of time, and once the trigger condition is met, it should continue to write the files for prescribed amount of time. I was not able to do this. The file name should also be updated accordingly.
I tried to with some options by keeping the creation of the file outside of the loop, if I do that then if the trigger condition is not met it will stop writing and I dont want that, as once the trigger condition is met it should be true thereafter.
So I cant keep any thing outside the while loop, bcaz then it checks the condition of the shift register for the trigger and I have it as a false constant.
I am attaching my application which is kind of mess and I have written in the application where I am having problems. For every iteration of while loop it makes a new file, and i dont want that, I want to write specific amount of time data to the each file.
Please take a look at my code and help me in solving the problem. Any insights and examples on how to do this thing will be a relief to me.
Thanks in advance.
Regards,
Nitin
Attachments:
PXI_4462_Sync_and_Stream_trigger.zip ‏192 KB

what i am saying is to keep track of how much data you have written and whenever you need to make a new file you make 1.
here is a vi that i just made that should show you. let me know if you need any help understanding it.
Attachments:
new file exemple.vi.zip ‏21 KB

While loop and for loop condition terminal

Hello friends,
I am using labview 8.6. The condition terminal of the while loop and conditional for loop is behaving in just the opposite way.
When i wire a true to the condition terminal of my loop, the while loop continues to run when I click on run. when I wire a FALSE, it stops.
Is there any setting change that I have to make it to get it work properly.
Please suggest on this.
Thanks and regards,
Herok

Please do NOT attach .bmp images with the extension changed to .jpg to circumvent the forum filters!
Herok wrote:
I am sending you the VI. I am not sure if this would help you because only in 2 computers this behaviour is seen. In others, it works as it is supposed to work.
Whatever you are seeing must be due to some corruption or folding error. It all works fine here.
To make sure there are no hidden objects, simply press the cleanup button which would reveal any extra stuff (which is obviously not there). Does it fix itself if you click the termination terminal an even number of times? What if you remove the bad loop and create a new one?
Could it be you have some problems with the graphics card and the icon of the conditional terminal does not update correctly?
Whay happens if you connect a control instead of a diagram constant?
What is different on the computers where it acts incorrectly (different CPU (brand, model), #of cores, etc.)
LabVIEW Champion . Do more with less code and in less time .

Can we execute a query in resultset while loop

can we execute a query in resultset while loop
for ex:
rs=st.executeQuery("SQL");
while(rs.next())
rs1=st.executequery("SQL1");
while(rs1.next())
}

If you do this, you lose "rs". Create a second
Statement object for the other query.This is right. We have done it many times, It is not the issue as long as you use different statement with in the body of the loop

Empty while-loop taking too much power

Hi all!
Would someone help me out with a better implementation of the below code. 'guard' is a class handling validation of users againt a database. I'm waiting for it to finish in an empty while loop in my GUI-class (extending JFrame). This obviously takes all CPU causing bad response time. Any smart suggestion on how to reduce this in my case?
Thanks in advance.
//Wait for the guard to validate user
while(guard.getGrantedPermission() == guard.PENDING) {}
if(guard.getGrantedPermission() == guard.ACCESS_ALLOWED) {
    setVisible(true);
* We should be able to work with the config object since it should
* be initialized when the password dialog prompts the user
   try {
      user = guard.getValidatedUsername();
      //Set the name of the customer
      config = new Config(user, new Date());
   } catch(NullPointerException npe) {
      npe.printStackTrace();
}

Don't use an empty while loop. It's a terrible construct. Listen to zurdo (the first reply). Don't use Thread.sleep() either, as it's inappropriate in your case.
If you don't want to use Observer and Observable, then use a new Thread using the wait() and notifyAll() constructs. See the tutorial at
http://java.sun.com/docs/books/tutorial/essential/threads/index.html
Pay careful attention to its warnings, though.

While Loop - Object Creation

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