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  • set arraylist element as null

    - by Jessy
    The first index is set to null (empty), but it doesn't print the right output, why? //set the first index as null and the rest as "High" String a []= {null,"High","High","High","High","High"}; //add array to arraylist ArrayList<Object> choice = new ArrayList<Object>(Arrays.asList(a)); for(int i=0; i<choice.size(); i++){ if(i==0){ if(choice.get(0).equals(null)) System.out.println("I am empty"); //it doesn't print this output } }

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  • Haskell: Constrain function on type Double to only work with Integers

    - by thurn
    Suppose I'm writing a function that takes a list of integers and returns only those integers in the list that are less than 5.2. I might do something like this: belowThreshold = filter (< 5.2) Easy enough, right? But now I want to constrain this function to only work with input lists of type [Int] for design reasons of my own. This seems like a reasonable request. Alas, no. A declaration that constraints the types as so: belowThreshold :: [Integer] -> [Integer] belowThreshold = filter (< 5.2) Causes a type error. So what's the story here? Why does doing filter (< 5.2) seem to convert my input list into Doubles? How can I make a version of this function that only accepts integer lists and only returns integer lists? Why does the type system hate me?

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  • schedule task with spring mvc

    - by user3586352
    I want to run the following method every specific time in spring mvc project it works fine and print first output but it doesn't access the database so it doesn't display list the method public class ScheduleService { @Autowired private UserDetailService userDetailService; public void performService() throws IOException { System.out.println("first output"); List<UserDetail> list=userDetailService.getAll(); System.out.println(list); } config file <!-- Spring's scheduling support --> <task:scheduled-tasks scheduler="taskScheduler"> <task:scheduled ref="ScheduleService" method="performService" fixed-delay="2000"/> </task:scheduled-tasks> <!-- The bean that does the actual work --> <bean id="ScheduleService" class="com.ctbllc.ctb.scheduling.ScheduleService" /> <!-- Defines a ThreadPoolTaskScheduler instance with configurable pool size. --> <task:scheduler id="taskScheduler" pool-size="1"/>

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  • Is it a good practice to perform direct database access in the code-behind of an ASP.NET page?

    - by patricks418
    Hi, I am an experienced developer but I am new to web application development. Now I am in charge of developing a new web application and I could really use some input from experienced web developers out there. I'd like to understand exactly what experienced web developers do in the code-behind pages. At first I thought it was best to have a rule that all the database access and business logic should be performed in classes external to the code-behind pages. My thought was that only logic necessary for the web form would be performed in the code-behind. I still think that all the business logic should be performed in other classes but I'm beginning to think it would be alright if the code-behind had access to the database to query it directly rather than having to call other classes to receive a dataset or collection back. Any input would be appreciated.

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  • MVC 3 Nested EditorFor Templates

    - by Gordon Hickley
    I am working with MVC 3, Razor views and EditorFor templates. I have three simple nested models:- public class BillingMatrixViewModel { public ICollection<BillingRateRowViewModel> BillingRateRows { get; set; } public BillingMatrixViewModel() { BillingRateRows = new Collection<BillingRateRowViewModel>(); } } public class BillingRateRowViewModel { public ICollection<BillingRate> BillingRates { get; set; } public BillingRateRowViewModel() { BillingRates = new Collection<BillingRate>(); } } public class BillingRate { public int Id { get; set; } public int Rate { get; set; } } The BillingMatrixViewModel has a view:- @using System.Collections @using WIP_Data_Migration.Models.ViewModels @model WIP_Data_Migration.Models.ViewModels.BillingMatrixViewModel <table class="matrix" id="matrix"> <tbody> <tr> @Html.EditorFor(model => Model.BillingRateRows, "BillingRateRow") </tr> </tbody> </table> The BillingRateRow has an Editor Template called BillingRateRow:- @using System.Collections @model IEnumerable<WIP_Data_Migration.Models.ViewModels.BillingRateRowViewModel> @foreach (var item in Model) { <tr> <td> @item.BillingRates.First().LabourClass.Name </td> @Html.EditorFor(m => item.BillingRates) </tr> } The BillingRate has an Editor Template:- @model WIP_Data_Migration.Models.BillingRate <td> @Html.TextBoxFor(model => model.Rate, new {style = "width: 20px"}) </td> The markup produced for each input is:- <input name="BillingMatrix.BillingRateRows.item.BillingRates[0].Rate" id="BillingMatrix_BillingRateRows_item_BillingRates_0__Rate" style="width: 20px;" type="text" value="0"/> Notice the name and ID attributes the BillingRate indexes are handled nicely but the BillingRateRows has no index instead '.item.'. From my reasearch this is because the context has been pulled out due to the foreach loop, the loop shouldn't be necessary. I want to achieve:- <input name="BillingMatrix.BillingRateRows[0].BillingRates[0].Rate" id="BillingMatrix_BillingRateRows_0_BillingRates_0__Rate" style="width: 20px;" type="text" value="0"/> If I change the BillingRateRow View to:- @model WIP_Data_Migration.Models.ViewModels.BillingRateRowViewModel <tr> @Html.EditorFor(m => Model.BillingRates) </tr> It will throw an InvalidOperationException, 'model item passed into the dictionary is of type System.Collections.ObjectModel.Collection [BillingRateRowViewModel] but this dictionary required a type of BillingRateRowViewModel. Can anyone shed any light on this?

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  • "more" as a target of piped command breaks bash

    - by xavier
    Consider following source, reduced for simplicity int main() { int d[2]; pipe(d); if(fork()) { close(1); dup(d[1]); execlp("ls", "ls", NULL); } else { close(0); dup(d[0]); execlp("cat", "cat", NULL); } } So it creates a pipe and redirects the output from ls to cat. It works perfectly fine, no problems. But change cat to more and bash breaks. The symptoms are: you don't see anything you type pressing "enter" shows up a new prompt, but not in a new line, but in the same one you can execute any command and see the output reset helps fixing things up. So there is a problem with input from keyboard, it is there, but is not visible. Why is that?

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  • Is "}while(0);" always equal to "break;}while(1);" ?

    - by Hernán Eche
    I have compared gcc assembler output of do{ //some code }while(0); with do{ //some code break; }while(1); The output is equal, with or without optimization but.. It's always that way? No experiment can prove theories, they can only show they are wrong And because (I hope) programming is not an experimental science, and results can be predicted (at least simple things) I want to be sure next time I reeplace a break;}while(1); for the clearer (and less risky) while(0); Thank you for reading

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  • How can I rewrite Verilog code to remove extra reg?

    - by EquinoX
    How can I rewrite the code below so that I don't need to have an extra reg mul. I just wanted to take the 32 bits of the resulting 32 * 32 bit multiplication and put it into Result input signed[31:0] Reg1; input signed[31:0] Reg2; output[31:0] Result; reg signed[31:0] Result; reg[63:0] mul; mul = Reg1 * Reg2; Result = mul[31:0];

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  • How to hide button value in url?

    - by Levani
    This is my search form: <form action="" method="get" name="search"> <input name="s" type="text" size="40" value="<?php echo $_GET["s"]; ?>" /> <input name="submit" type="submit" value="Search" /> </form> When someone clicks the search button the url in browser's address bar is something like this: http://example.com/?s=someting&submit=Search How can I change it so that it only displays: http://example.com/?s=someting Hope I'm clear...

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  • Programming in Python; writing a Caesar Cipher using a zip() method

    - by user1068153
    I'm working on a python program for homework and the problem asks me to develop a program that encrypts a message using a caesar cipher. I need to be able to have the user input a number to shift the encryption by, such as 4: e.g. 'A' to 'E'. The user also needs to input the string to be translated. The book says to use a zip() to do the problem. I am confused on how I would do this though. I have this but it doesn't do anything >>>def ceasarCipher(string, shift): strings = ['abc', 'def'] shifts = [2,3] for string, shift in zip(strings, shifts): print ceasarCipher(string,shift) >>>string = 'hello world' >>>shift = 1

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  • Load a single symbol from a LaTeX package

    - by Martijn
    When using the MnSymbol package, pdflatex gives two font warnings: LaTeX Font Warning: Encoding 'OMS' has changed to 'U' for symbol font (Font) 'symbols' in the math version 'normal' on input line 120. LaTeX Font Info: Overwriting symbol font 'symbols' in version 'normal' (Font) OMS/cmsy/m/n --> U/MnSymbolF/m/n on input line 120. It turns out that this is probably due to a clash with the AMSSymb package. Since I need just a few symbols from the package: is there a way to load one symbol from a package, in stead of all?

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  • Unexpected token from webservice

    - by Kenneth B
    I got this little snippet where I call a Battlefield 3 stat server. If you visit this URL, which I'm calling, we'll be getting no errors: http://api.bf3stats.com/pc/server/?output=json&id=534f7035-cef8-48aa-b233-8d44a0956e68 But when I try to get the stats via Ajax call, I get: Uncaught SyntaxError: Unexpected token : ... In my console I can see that the response is coming in, as when I visit the url, but I can't get the data with the ajax call... Is there something wrong with my code??? $.ajax({ type: "GET", url: "http://api.bf3stats.com/pc/server/?output=json&id=534f7035-cef8-48aa-b233-8d44a0956e68", dataType: "jsonp", success: function(response) { console.log(response); } }); Thank you in advance...

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  • In OCaml, how can I create an out_channel which writes to a string/buffer instead of a file on disk

    - by Tianyi Cui
    I have a function of type in_channel -> out_channel -> unit which will output something to an out_channel. Now I'd like to get its output as a string. Creating temporary files to write and read it back seems ugly, so how can I do that? Is there any other methods to create out_channel besides Pervasives.open_out family? Actually, this function implemented a repl. What I really need is to test it programmatically, so I'd like to first wrap it to a function of type string -> string. For creating the in_channel, it seems I can use Scanf.Scanning.from_string, but I don't know how to create the out_channel parameter.

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  • Threadpool with pasistant worker instances

    - by Matt Smokey-waters Holmes
    So basically what im trying to do is queue up tasks in a thread pool to be executed as soon as a worker becomes free, i have found various examples of this but in all cases the examples have been setup to use a new Worker instance for each job, i want persistent workers. Im trying to make a ftp backup tool, i have it working but because of the limitations of a single connection it is slow. What i ideally want to do is have a single connection for scanning directories and building up a file list then four workers to download said files. Here is an example of my worker /** * FTP Worker */ public class Worker implements Runnable { protected FTPClient _ftp; // Connection details protected String _host = ""; protected String _user = ""; protected String _pass = ""; // worker status protected boolean _working = false; public Worker(String host, String user, String pass) { this._host = host; this._user = user; this._pass = pass; } // Check if the worker is in use public boolean inUse() { return this._working; } @Override public void run() { this._ftp = new FTPClient(); this._connect(); } // Download a file from the ftp server public boolean download(String base, String path, String file) { this._working = true; boolean outcome = true; //create directory if not exists File pathDir = new File(base + path); if (!pathDir.exists()) { pathDir.mkdirs(); } //download file try { OutputStream output = new FileOutputStream(base + path + file); this._ftp.retrieveFile(file, output); output.close(); } catch (Exception e) { outcome = false; } finally { this._working = false; return outcome; } } // Connect to the server protected boolean _connect() { try { this._ftp.connect(this._host); this._ftp.login(this._user, this._pass); } catch (Exception e) { return false; } return this._ftp.isConnected(); } // Disconnect from the server protected void _disconnect() { try { this._ftp.disconnect(); } catch (Exception e) { /* do nothing */ } } } and basically i want to be able to call Worker.download(...) for each task in a queue whenever a worker becomes available without having to create a new connection to the ftp server for each download Any help would be appreciated as iv'e never used threads before and I'm going round in circles at the moment

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  • IE6 forces Two clicks to trigger javascript style=display:inline; event

    - by JiminyCricket
    I have a web form that has 2 radio buttons, depending on which one is clicked it displays a hidden element This works fine in all browsers except for IE6, which, after I click on the radio button, I have to click again (anywhere on the window) and then the element is displayed...has anyone had behavior like this before? I tried to not use jQuery and do straight getElementById() but I get the same behavior... JSCRiPT function showHidden(divid) { $('#'+divid).css( {'display':'inline'} ); } HTML <input type=radio name=borp value=1 onChange='showHidden("brandchecks")' > Brand <input type=radio name=borp value=2 onChange='showHidden("productchecks")' > Product <div id='brandchecks' style='display:none;'> Blah </div> <div id='productchecks' style='display:none;'> Blah </div>

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  • Form Arrays support across browsers

    - by Stomped
    I'm not even sure if form arrays is the proper term, but it looks a bit like this: <input name='element[]' type='text' /> <input name='element[]' type='text' /> Which is then retrieved in PHP as an array stored in $_POST['element'] -- in this case with 2 values. I've tested it in the browsers I have available to me, but I've never seen this before and I'm wondering is this supported pretty much in all browsers? Or is this something very old that I've just not run into? Thanks!

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  • Submit button outside form_for loop

    - by user1152142
    I have set up some horizontal tabs using twitter bootstrap and I am rendering a form inside each of the tabs: <div class="tab-content"> <div id="tab1" class="tab-pane active"> <%= render :partial => "shipdr/websites/form", locals: {:@shipdr_website => shipdr_website} %> </div> <div id="tab2" class="tab-pane"> Another form (not yet implemented) </div> <div id="tab3" class="tab-pane"> Another form (not yet implemented). </div> </div> Then in shipdr/websites/form I have: <%= simple_form_for(@shipdr_website) do |f| %> <% if @shipdr_website.errors.any? %> <div id="error_explanation"> <h2><%= pluralize(@shipdr_website.errors.count, "error") %> prohibited this shipdr_website from being saved:</h2> <ul> <% @shipdr_website.errors.full_messages.each do |msg| %> <li><%= msg %></li> <% end %> </ul> </div> <% end %> <div class="field"> <%= f.input :name %> </div> <div class="field"> <%= f.input :url %> </div> <div class="field"> <%= f.input :api_key %> </div> <div class="actions"> <%= f.submit nil, :class => "btn btn-primary" %> </div> <% end %> I want to move the submit button outside of the "tab-content" area so when a user clicks the submit button, all three forms area submitted. All forms will use that same model and the same action but will have different field. The idea is similar to a wizard except I am using tabs. Does anyone have any idea how I can move the submit button outside of the form_for loop and how I can submit the three forms with a single button?

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  • How to close jQuery Dialog within the dialog?

    - by imperialx
    Hello, How to close jQuery Dialog within the dialog without using the close button? Inside the ui dialog is a simply form request and if a successful submission occurs, then the ui dialog automatically closes and refreshes the parent page. <script type="text/javascript"> $(document).ready(function () { $("#form-dialog").dialog({ autoOpen: true, modal: true, width: 200, draggable: true, resizable: true }); }); </script> <div id="form-dialog" title="Form Submit"> <form action="default.aspx" method="post"> <input type="text" name="name" value=" " /> <input type="submit" value="submit" /> </form> </div> -imperialx

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  • How to align checkboxes and their labels consistently cross-browsers

    - by One Crayon
    This is one of the minor CSS problems that plagues me constantly. How do folks around StackOverflow vertically align checkboxes and their labels consistently cross-browser? Whenever I align them right in Safari (usually using vertical-align: baseline on the input), they're completely off in Firefox and IE. Fix it in Firefox, and Safari and IE are inevitably messed up. I waste time on this every time I code a form. Here's the standard code that I work with: <form> <div> <label><input type="checkbox" /> Label text</label> </div> </form> I usually use Eric Meyer's reset, so form elements are relatively clean of overrides. Looking forward to any tips or tricks that you have to offer!

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  • Printf ubuntu Segmentation fault (core dumped)

    - by Someone
    I have this code: int a; printf("&a = %u\n",(unsigned)&a); printf("a\n"); printf("b\n"); printf("c\n"); printf("d\n"); I tried to print the pointer of a variable. But it fail on the row printf("a\n"); and says Segmentation fault (core dumped) Output: &a = 134525024 Segmentation fault (core dumped) When I remove the row printf("&a = %u\n",(unsigned)&a); from the code, its success. Output: a b c d What worng in my code?

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  • Dynamic creation of a pointer function in c++

    - by Liberalkid
    I was working on my advanced calculus homework today and we're doing some iteration methods along the lines of newton's method to find solutions to things like x^2=2. It got me thinking that I could write a function that would take two function pointers, one to the function itself and one to the derivative and automate the process. This wouldn't be too challenging, then I started thinking could I have the user input a function and parse that input (yes I can do that). But can I then dynamically create a pointer to a one-variable function in c++. For instance if x^2+x, can I make a function double function(double x){ return x*x+x;} during run-time. Is this remotely feasible, or is it along the lines of self-modifying code?

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  • Determining Terminal lines/cols via PHP CLI

    - by eFrane
    I know that it is quite easy to figure out a terminal's size parameters via the stty -a command. When using local CLI PHP scripts, there is no problem at all on grabbing that output via system() or so. But I am trying the same thing via a php script started from an ssh command. Sadly, all that stty ever returns is: stty: standard input: Invalid argument. The calling code is: exec('stty -a | head -n 1', $query); echo $query[0]; So the question is: If I can output to the terminal and read input from it (e.g. can fread() from STDIN and fwrite() to STDOUT in PHP, shouldn't stty also have valid STDIN and STDOUT?

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  • Convert String containing several numbers into integers

    - by GobiasKoffi
    I realize that this question may have been asked several times in the past, but I am going to continue regardless. I have a program that is going to get a string of numbers from keyboard input. The numbers will always be in the form "66 33 9" Essentially, every number is separated with a space, and the user input will always contain a different amount of numbers. I'm aware that using 'sscanf' would work if the amount of numbers in every user-entered string was constant, but this is not the case for me. Also, because I'm new to C++, I'd prefer dealing with 'string' variables rather than arrays of chars.

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  • Dynamically generate Triangle Lists for a Complex 3D Mesh

    - by Vulcan Eager
    In my application, I have the shape and dimensions of a complex 3D solid (say a Cylinder Block) taken from user input. I need to construct vertex and index buffers for it. Since the dimensions are taken from user input, I cannot user Blender or 3D Max to manually create my model. What is the textbook method to dynamically generate such a mesh? Edit: I am looking for something that will generate the triangles given the vertices, edges and holes. Something like TetGen. As for TetGen itself, I have no way of excluding the triangles which fall on the interior of the solid/mesh.

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  • Python: Regex outputs 12_34 - I need 1234

    - by Guy F-W
    So I have input coming in like: 12_34 5_6_8_2 4___3 1234 and the output I need from it is: 1234, 5682, 43, 1234 I'm currently working with r'[0-9]+[0-9_]*'.replace('_','') which (as far as I can tell) successfully rejects any input which is not a combination of numeric digits and under-scores, where the underscore cannot be the first character. However, replacing the _ with the empty string causes 12_34 to come out as 12 and 34. Is there a better method than 'replace' for this? Or could I adapt my regex to deal with this problem?

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