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• Why is String final in Java?

  - by Alex

  From when I learned that the class java.lang.String is declared as final in Java, I was wondering why is that? I didn't find any answer back then, but this post: How to create a replica of String class in Java? reminded me of my query. Sure, String provides all the functionality I ever needed, and never thought of any operation that would require an extension of class String, but still you'll never know what someone might need! So, does anyone know what was the intent of the designers when they decided to make it final? See also: Why is String a sealed class in C#?

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• Passing an array for setting variable

  - by mathk

  Hi, I often see this idiom when reading php code: public function __construct($config) { if (array_key_exists('options', $config)) { ... } if (array_key_exists('driver_options', $config)) { ... } } Here I am concern with the way the parameter is used. If I were in lisp I would do: (defun ct (&key options driver_options) (do-something-with-option-and-driver_option)) But since I am in PHP I would rather have a constructor that take a list of parameter and let them be null if there a not require. So what do you guys think about having an array as parameter in other to do some initialization-or-whatever? In other to answer you have to take in account the point of view of the user of the function and the designer of the API. Also have you ever heard this has a code-smell? thanks

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• jQuery/javascript events - prototype event handler

  - by Brian M. Hunt

  The following code doesn't work as I intuitively expect it to: function MyObject(input) { input.change(this._foo); this.X = undefined; } MyObject.prototype._foo = function() { alert("This code is never called"); // but if it did this.X = true; } var test_input = $("input#xyz"); // a random, existing input var m = MyObject(test_input); // attach handler (or try to) test_input.change(); // trigger event alert(m.X); // undefined I'd expect that _foo() would be called (and, if that ever happens, that the this variable in _foo() would be an instantiation of MyObject. Does anyone know why this doesn't work, and of any alternative pattern for passing an object to an event handler? Thank you for reading. Brian

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• SQL Server: Mitigating schema changes/upgrades

  - by bradhe

  I haven't spent a ton of time researching this yet, mostly looking for best practices on upgrading/changing DB schemas. We're actively developing a new product and as such we often have additions or changes to our DB schema. We also have many copies of the DB -- one for the test environment, one for the prod environment, dev environments, you name it. We don't really want to have to blow away test data every time we want to make a change to the DB. Are there good ways of automating this or handling this? None of us have really ever had to deal with this so...

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• how to use expressons as function parameters in powershell

  - by rmeador

  This is a very simple task in every language I have ever used, but I can't seem to figure it out in PowerShell. An example of what I'm talking about in C: abs(x + y) The expression x + y is evaluated, and the result passed to abs as the parameter... how do I do that in PowerShell? The only way I have figured out so far is to create a temporary variable to store the result of the expression, and pass that. PowerShell seems to have very strange grammar and parsing rules that are constantly catching me by surprise, just like this situation. Does anyone know of documentation or a tutorial that explains the basic underlying theory of the language? I can't believe these are all special cases, there must be some rhyme or reason that no tutorial I have yet read explains. And yes, I've read this question, and all of those tutorials are awful. I've pretty much been relegated to learning from existing code.

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• Disk Cost does not change for a per machine and a per user install

  - by eddie

  I want to know how can i change or rather the computer changes the disk cost in case of a per user or a per machine install. I have an installer that is approximate 50 MB in size when i check in the program files how ever when i am using the DiskCostDlg it shows me 96 MB , i am doing a per user and a per machine install and i am surprised to see that in both the cases the disk requirement is same. I need to know if there is a possibility of changing the disk requirements or is it a default property of the Wix Installer. Thanks

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• Help needed in filling a questionnaire for dissertation will only take 5 minutes

  - by Ryan

  I am a Maltese student currently working on my dissertation which focuses on J2ME Wireless SOAP protocol. Since in my country i.e. Malta we don’t have professional mobile developers I had to turn myself to online questionnaires for my research methodology those of you who has done a thesis know what I am talking about ?. Please I anyone who has ever done any mobile development which concerns SOAP or any similar protocol used for web services, could you kindly answer my questionnaire as this is an essential core part of my thesis. Please respond with honesty and at your earliest convince since time is of top priority. Below is the link to the questionnaire: http://www.kwiksurveys.com/online-survey.php?surveyID=KHOHIO_c6f874da Thanks in advance

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• check external website registration

  - by Arsenal

  Hi, I'm trying to create a PHP based game where you have to do all sorts of simple but un-obvious tasks in order to progress to the next level (eg. refresh browser, press keyboard combination, ...) Kinda like the game "this is the only level" (if anyone has ever heard of it) Now I was thinking: Would it be possible to create a level where they'd have to sign up at a different page in order to progress to the next level? So say for example they need to sign up to goal.com and if they're signed up they proceed to the next level. The page would need to constantly check if the signup process on the other site is completed. Is this even possbible? And if so, any thoughts on how? Thanks!

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• Show extra info for Preference screens when CheckboxPreference summary field is not enough long?

  - by Pentium10

  I have situation when you can enabled/disable modules for my Android application. For this I use a CheckboxPreference screen. This is all good, but the summary field gets cut off if longer descriptions are added than 2 lines. Suppose I have 4-5 lines of description available for each module, I would like to display this in a helper window. I tried to bind a click event to the CheckboxPreference, but that fires for the whole line, so not only when the checkbox is clicked, and more, where ever you click on the line the checkbox is toggled. So now I am wondering if this can be fixed. So if the user needs more info, just taps the text and the helper opens up, and if want to toggle the settings it taps the checkbox. How would you do it? I am open to other ideas too, if they do work.

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• Capture output of another action within current action?

  - by wizzard

  I have been trying to find a way to capture the output (rendered view) of another action within the current action... something akin to output buffering. The scenario is that I need to save a "snapshot" of a report. The data used in the report is ever-changing, and for whatever reason I need to actually save the view HTML rather than just a data array. I have created a snapshotAction(), and I want to somehow capture the output of the separate reportAction() within it. I don't want to render the reportAction() to the screen, I want it to render within my current action, before the action completes. Is there any way to do this in ZF?

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• Conditional Regex Replace in C# without MatchEvaluator

  - by Buttink

  So, Im trying to make a program to rename some files. For the most part, I want them to look like this, [Testing]StupidName - 2[720p].mkv But, I would like to be able to change the format, if so desired. If I use MatchEvaluators, you would have to recompile every time. Thats why I don't want to use the MatchEvaluator. The problem I have is that I don't know how, or if its possible, to tell Replace that if a group was found, include this string. The only syntax for this I have ever seen was something like (?<group>:data), but I can't get this to work. Well if anyone has an idea, im all for it.

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• Why can't I access a web app running on my Mac via my iPhone?

  - by bpapa

  I'm developing an iPhone app that has a network component. I'm developing the app in Java (Google App Engine actually), running on port 8080. And it works, when I test my app in the iPhone simulator. But now I am trying to test on the device, and I can't hit my Jetty instance. I can certainly access my Mac via the iPhone because I'm able to hit http://10.0.1.7/~brianpapa/ and view my Home Folder when Web Sharing is turned on. But when I try to hit http://10.0.1.7:8080/, it says it can't connect to the server. Interestingly, if I try to hit http://10.0.1.7:8080/ from my mac, it doesn't work either - I have to use localhost as the hostname instead, then it's fine. Has anybody ever encountered this before, and know how to fix it?

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• Why prefix sql function names?

  - by AaronLS

  What is a scenario that exemplifies a good reason to use prefixes, such as fn_GetName, on function names in SQL Server? It would seem that it would be unnecessary since usually the context of its usage would make it clear that it's a function. I have not used any other language that has ever needed prefixes on functions, and I can't think of a good scenario that would show why SQL is any different. My only thinking is that perhaps in older IDE's it was useful for grouping functions together when the database objects were all listed together, but modern IDE's already make it clear what is a function.

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• Ant task does not return properly if slept longer than 9 seconds executing from jruby.

  - by Christopher Dancy

  So here is a strange error/bug/idk ... I'm running jruby 1.4 with ant 1.8 ... from within jruby I execute an ant task with system(command_to_execute_ant_script) and everything works as expected ... however if the ant should sleep for longer than 9 seconds the script does not return EVER from within jruby. If the script sleeps for exactly 9 seconds or less the script returns properly. I've tried using jruby.1.5.0.rc1 as well as older versions of ant and still the same problem ... Any ideas?

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• Is Microsoft's Ribbon UI really that great, from a usability perspective?

  - by Thomas Owens

  The first time I ever used it was at my current job. Among my coworkers, the feelings toward it for usability are mixed. The other developer doesn't really care one way or the other, as long as Office does everything he needs it to do when writing reports. The top manager likes it because it feels natural, and I feel the same way. But another coworker finds in klunky and hard to use (although she admits that she only uses it at home as her machine hasn't been upgraded yet, and that might change if she uses it more often at work). So - is the Ribbon UI really that innovative? What qualities about it make it a good or bad user interface mechanism? Possibly related: Adoption of the Ribbon UI

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• What good timesheet should and shouldn't have for a small (non programming) 50 people company?

  - by MadBoy

  I'm sure most people here had to fill at least one time sheet in their life that made their life miserable, hell it's even the worst time taker ever especially after you have to fill it in hurry. I will be developing some simple TimeSheet application for a small company of 50 people (non programming related, it's actually 4 companies working together) and would like it to be user friendly and as less disturbing as possible. So what in your opinion makes it a good timesheet (lack of it doesn't count :p), what data it should store? Should be only hours per day with possibility to choose project, company and simple overview what you have worked on like: Day 1, 3:00, 'Company 1', 'Project5', 'Name', Short Overview Day 1, 5:00, 'Company 2', 'Project6', 'Name', Short Overview Or should it gather more data? Would it be realy bad if it were an WinForms application considering that I don't know ASP.NET or any other web based language? I would be deploying it using ClickOnce or so.

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• Why are not all texts of my MFC applicatiopn displayed using ClearType?

  - by mxp

  I've got an MFC application that is built with VC6. When ClearType is enabled (Windows XP) some texts are rendered smoothly, i.e. with ClearType, and others are not. Dialog texts don't seem to ever get rendered with ClearType. Some list controls, however, have it enabled completely, others only in their headers. What could be the reason for this? Where should I look to find out why it works only in some places and doesn't in others?

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• Should we create Virtual Machine environment so a consultant can develop in similiar environment?

  - by ChrisNel52

  This is a large project and currently there are only 3 developers working on it. We have some money in the budget to contract development help from a software consulting firm. However, because the location of our business it would be beneficial if the consultant could do their development off-site. Also, our company policy doesn't allow contract help to VPN into our network, so that is not an option. My question is, would it be a good idea to create a Virtual Machine that copies our internal environment (particularly our database and WCF service) and give the consultant the Virtual Machine image so that they can replicate the environment at their place of work? I haven't worked much with Virtual Machines, so I'm not sure if this is a good idea or if there are huge obstacles that I'm not thinking of. If anyone has ever done anything like this, it would be great to hear the pros/cons. Any help would be appreciated.

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• Database indexes and their Big-O notation

  - by miket2e

  I'm trying to understand the performance of database indexes in terms of Big-O notation. Without knowing much about it, I would guess that: Querying on a primary key or unique index will give you a O(1) lookup time. Querying on a non-unique index will also give a O(1) time, albeit maybe the '1' is slower than for the unique index (?) Querying on a column without an index will give a O(N) lookup time (full table scan). Is this generally correct ? Will querying on a primary key ever give worse performance than O(1) ? My specific concern is for SQLite, but I'd be interested in knowing to what extent this varies between different databases too.

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• Batch backup a harddrive without modifying access times C#

  - by johnathan-doena

  I'm trying to write a simple program that will backup my flash drive. I want it to work automatically and silently in the background, and I also want it to be as quick as possible. The thing is, resetting all the access times is useless to me, and something I want to avoid. I know I can read the access times and set them back, but I bet it will fail one day in the future. It would be much simpler to read the files without ever changing it. Also, what is the fastest way to do this? What differences would there be between, say, a flash drive and an external hard drive. I am writing this in C#, as it is the simplest way to do it and it will probably last more generations of Windows..

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• Thread Local Memory for Scratch Memory.

  - by Hassan Syed

  I am using Protocol Buffers and OpensSSL to generate, HMACs and then CBC encrypt the two fields to obfuscate the session cookies -- similar Kerberos tokens. Protocol Buffers' API communicates with std::strings and has a buffer caching mechanism; I exploit the caching mechanism, for successive calls in the the same thread, by placing it in thread local memory; additionally the OpenSSL HMAC and EVP CTX's are also placed in the same thread local memory structure ( see this question for some detail on why I use thread local memory and the massive amount of speedup it enables even with a single thread). The generation and deserialization, "my algorithms", of these cookie strings uses intermediary void *s and std::strings and since Protocol Buffers has an internal memory retention mechanism I want these characteristics for "my algorithms". So how do I implement a common scratch memory ? I don't know much about the rdbuf of the std::string object. I would presumeably need to grow it to the lowest common size ever encountered during the execution of "my algorithms". Thoughts ?

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• debugging on bsd using gdb or similar tootls

  - by agent.smith

  I have started using freebsd lately and realized gdb does not support remote debugging on it. Whenever, I try to do remote debugging using gdbserver, I run into SIGSEGV crashes and error message says can’t find definition of “r_debug_state”. Has anyone ever experienced this and solved it? Statically compiled single threaded programs can be compiled using gdbserver. However, other than that it is mostly looking difficult to use. Let me know if anyone knows any other tools to do remote application debugging on bsd or how to fix the issue. (I am on x64 freebsd 9) Thanks

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• How to show / hide multiple elements at the same time with javascript

  - by DerNalia

  So, I have this between my head tags <script type="text/javascript"> hidden_links = document.getElementsByName("javascript_needed"); for (i = 0; i < hidden_links.length; i++) { hidden_links[i].style.display = "visible"; } </script> And my divs are all similar to <div name="javascript_needed" style="display: none;">stuff</div> the overall goal here, is to have these divs hide when javascript is disabled, and re-enable them when javascript is enabled.... but for whatever reason, my code doesn't work. I ever tried it in the webkit console, and nothing errored =\

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• How to get <select> options either (value or text) using jQuery

  - by Muhammad Sajid

  Hello, i have a code for <select id='list'> <option value='1'>Option A</option> <option value='2'>Option B</option> <option value='3'>Option C</option> </select> and i want that how ever i select any option, it will show in an alert message. i have try <script type='text/javascript'> //var value = $("#list option[value=2]").text(); //var value = $("#list option:selected").text(); //var value = $('#list').val(); var value = $(this).val(); alert(value); </script> but fail.

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• what kind of credentials/prerequisites do you need to be a professional penetration tester ?

  - by dfafa

  does it take more than knowing Bt4 ? are there any one that just runs a scanner and no real labor involved ? would you be expected to be able to code your own exploits without having to dl from milw0rm and discover entry into a system by yourself, in other words, do you have to think outside the box even when there's so many tools that makes the job a lot easier ? would you ever be expected to be able to write your own scanners, exploits and etc ? i am also curious how people are able to write long pages of hex address, that magically causes some type of memory overflow...how are people guessing at the hex values for game hacks for instance ? are certification important ? what about formal school education ? I am a CS major.

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