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• Understanding the Java Ecosystem

  - by syrion

  I have traditionally had the "luxury" of being a one-man development team. I've used Python extensively, have a reasonable command of Perl, PHP, and JavaScript. My problem is Java. I can write Java code. I'm not great at it--unlike Python, I rarely make use of anything unique to Java when I'm writing it. Furthermore, my experience is mostly in simple GUI/console programming. Unfortunately, I'm currently pursuing an IT degree where Java is the lingua franca. My database class is requiring that our projects be written in Java using servlets, and I just can't wrap my head around the ecosystem. Is there a good online overview of or tutorial on how the Java web ecosystem works? I have Thinking in Java, but it's mostly just the language itself (which I understand well enough to get by). I have looked at the Sun servlet tutorial, but it seems outdated.

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• Distance between two 3D objects' faces

  - by Arthur Gibraltar

  I'm really newbie on programming and I'm making some tests. I couldn't find nowhere on Internet how could I calculate the distance between two 3D objects' faces. Is there anyway? Detailing, as an example, I have two 3D cubes. Each one has a vector3 position designating it's center on the 3D space and an orientation matrix. And each cube has a size (float width, float height and float length). I could get a simple distance between them by calling Vector3.Distance(), but it doesn't consider its sizes, just the position. Then the distance would be between its centers. Is there any way to calculate the distance between the faces? Thanks for any reply.

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• Why is implementing copy-paste in a touch screen based smartphone such a big deal?

  - by EpsilonVector

  I'm not entirely sure this is on-topic, but it definitely needs a programmer's understanding to be answered, and deals with general development (for a specific scenario) as opposed to a specific piece of code. In a way it also translates into "what are the challenges in doing X in a touch screen app", and similar questions have been asked here in the past. So here it is: When Apple didn't implement copy-pasting on the iPhone since version 1 I just assumed it was a UI issue- they were waiting until they figured out a good UI for it. But now the idea is out there, and Microsoft still released Windows Phone 7 without copy-pasting, promising it'll be ready in a few months. My question is: why does this takes a few months to implement? Are there some technological challenges that are unique to programming for a touch screen that I'm not familiar with?

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• Web development tools/approaches?

  - by Clinton

  My day job involves a bit of programming, but I've recently been attempting some web development for personal reasons. I've got Drupal up and running and done basic things like add new content (i.e. heading and text) and add modules and themes, but I'm not sure how to approach actually designing pages. When I mucked around with webpages 15 years ago, it was just a mixture of HTML, CSS and Javascript, generally written with a text editor. Have things changed, or is this the way I'd make a Drupal page today? If it makes a difference, in my case the page's I want to design simply have static content, but I'd like them to be easily updatable.

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• How does throwing an ArgumentNullException help?

  - by Scott Whitlock

  Let's say I have a method: public void DoSomething(ISomeInterface someObject) { if(someObject == null) throw new ArgumentNullException("someObject"); someObject.DoThisOrThat(); } I've been trained to believe that throwing the ArgumentNullException is "correct" but an "Object reference not set to an instance of an object" error means I have a bug. Why? I know that if I was caching the reference to someObject and using it later, then it's better to check for nullity when passed in, and fail early. However, if I'm dereferencing it on the next line, why are we supposed to do the check? It's going to throw an exception one way or the other. Edit: It just occurred to me... does the fear of the dereferenced null come from a language like C++ that doesn't check for you (i.e. it just tries to execute some method at memory location zero + method offset)?

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• Are these interview questions too complex for entry-level C++ positions?

  - by Banana

  Hi All, I recently had a few interviews for programming jobs within the financial industry. I am looking for entry-level positions as I specify in the cover letter. However I am usually asked questions such as: - all two-letters commands you know in unix - representation of float/double numbers (ieee standard) - segmentation fault memory dump, and related issues - all functions you know to convert string to integer (not just atoi) - how to avoid virtual tables - etc.. Is that the custom? Because I don't think this kind of questions make sense for someone willing to get an entry-level job. Is it totally crazy to think that they should ask more conceptual questions? This is beginning to driving me nuts, honestly. Thanks

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• What is missing and should be added to Code Complete 3rd Edition? [closed]

  - by Peter Turner

  It's been quite a few years since Code Complete was published. I really love the book, I keep it in the bathroom at the office and read a little out of it once or twice a day. What developments in computer software... development need to be added to Code Complete 3e, and for the sake of reductionism, what should be removed to make room for them? Is it necessary even possible to call Code Complete Code Complete if it doesn't have language features that even Delphi has like anonymous methods and generics? Also, what languages would be more appropriate than C++ to use for a majority of code examples?

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• Resources on learning to program in machine code?

  - by AceofSpades

  I'm a student, fresh into programming and loving it, from Java to C++ and down to C. I moved backwards to the barebones and thought to go further down to Assembly. But, to my surprise, a lot of people said it's not as fast as C and there is no use. They suggested learning either how to program a kernel or writing a C compiler. My dream is to learn to program in binary (machine code) or maybe program bare metal (program micro-controller physically) or write bios or boot loaders or something of that nature. The only possible thing I heard after so much research is that a hex editor is the closest thing to machine language I could find in this age and era. Are there other things I'm unaware of? Are there any resources to learn to program in machine code? Preferably on a 8-bit micro-controller/microprocessor. This question is similar to mine, but I'm interested in practical learning first and then understanding the theory.

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• Rotate a vector by given degrees (errors when value over 90)

  - by Ivan

  I created a function to rotate a vector by a given number of degrees. It seems to work fine when given values in the range -90 to +90. Beyond this, the amount of rotation decreases, i.e., I think objects are rotating the same amount for 80 and 100 degrees. I think this diagram might be a clue to my problem, but I don't quite understand what it's showing. Must I use a different trig function depending on the radians value? The programming examples I've been able to find look similar to mine (not varying the trig functions). Vector2D.prototype.rotate = function(angleDegrees) { var radians = angleDegrees * (Math.PI / 180); var ca = Math.cos(radians); var sa = Math.sin(radians); var rx = this.x*ca - this.y*sa; var ry = this.x*sa + this.y*ca; this.x = rx; this.y = ry; };

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• What are some recommended video lectures for a non-CS student to prepare for the GRE CS subject test?

  - by aristos

  Well the title kinda explains all there is to explain. I'm a non-cs student and was preparing to apply PhD programs in applied mathematics. But for my senior thesis I've been reading lots of machine learning and pattern recognition literature and enjoying it a lot. I've taken lots of courses with statistics and stochastics content, which I think, would help me if I get accepted to a program with ML focus, but there are only two CS courses -introduction to programming- in my transcript and therefore I decided to take the CS subject test to increase my chances. Which courses do you think would be most essential to have a good result from CS subject test? I'm thinking of watching video lectures of them, so do you have any recommendations?

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• How to link subprograms to a main program's game loop?

  - by Jim

  I recently discovered Crobot which is (briefly) a game where each player codes a virtual robot in a pseudo-C language. Each robot is then put in an arena where it fights against other robots. A robots' source code has this shape : /* Beginning file robot.r */ main() { while (1) { /* Do whatever you want */ ... move(); ... fire(); } } /* End file robot.r */ You can see that : The code is totally independent from any library/include Some predefined functions are available (move, fire, etc…) The program has its own game loop, and consequently is not called every frame My question is roughly : how does it work ? It seems that each robot's code is compiled by the main program and then used in a way I cannot understand. I thought it could yields a thread for each robot, but I have not any proof of this and it seems a bit complicated to achieve it. Any idea how it could work, someone ?

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• Do leaderboard sets (in Game Center) allow 500 unique leaderboards?

  - by Korey Hinton

  The Game Kit Programming Guide for iOS claims: The number of different leaderboards allowed increases to 500 leaderboards per game when leaderboard sets have been enabled...Leaderboard sets offer developers the ability to combine several leaderboards into a single group. But their example (see image below) implies that a single leaderboard is placed into multiple leaderboard sets. Is that the only way to be able to use the full 500 leaderboards? by combining the same leaderboard into multiple sets? I want to be able to have 500 unique leaderboards that are not duplicated between sets. Is this possible?

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• How to create an auto-grader in and for Python

  - by recluze

  I'm trying to create an auto-grader for one of my beginning programming courses for python. From my online search, I've come to know that it is effectively a unit test framework that tests the student's code rather than production code but I'm not really sure how to structure the flow of the program. Can anyone please provide a strategy for submission of code by students and automating the whole process of marking? For instance, how would the student code be submitted and then stored/structured on disk, how would the grades be stored/reported? I'm only looking for a broad strategy and will try on my own to fill in the blanks. (I asked this on stockoverflow.com initially but it's considered as off-topic and I was suggested to ask here.)

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• Free C# Online Classes

  Now you can learn C language online from expert teachers of WiZiQ. These are Free Online Classes on C# which are scheduled on different timings. You can join the class as per your convenience.  Below are some of the topics which are covered in the classes:Programming with Collections in C#.NETIntroduction to Complex NumbersC++ Fundamental 2C++ ProgrammingThe recordings of these classes are also available which you can view anytime. ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Why is there a "new" in Go?

  - by dystroy

  I'm still puzzled as why we have new in Go. When you want to instantiate a struct, you do t := Thing{} and, obviously, you can get a pointer to a new instance by doing t := &Thing{} But there's also this possibility : t := new(Thing) This last one seems a little alien to me. &Thing{} is as clear and concise as new(Thing) and it uses only constructs you often use elsewhere. It's also more extensible as you might change it to &Thing{3} or &Thing{Feets:7}. In my opinion, having a supplementary keyword is costly, it makes the language more complex and adds to what you must know. And it might mask to newcomers what's behind instantiating a struct. It also makes one more reserved word. So what's the reasoning behind new ? Is it something useful ? Should we use it ?

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• Extending jQuery with jQuery.Extend

  - by Jalpesh P. Vadgama

  We all know that jQuery is a great JavaScript framework. It’s provide lots of functionalities and most used framework in programming world. But sometimes we need a functionality that does not provided by jQuery by default. At that time we need to extend jQuery. We can extend jQuery with jQuery.Extend  Method. You can get complete information from the following link. http://api.jquery.com/jQuery.extend/ It merges the contents of two or more objects together into the first object. More on my personal blog @www.dotnetjalps.com

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• How do I start correctly in building database classes in c#?

  - by e4rthdog

  I am new in C# programming and in OOP. I need to dive into web applications for my company, and I need to do it fast and correct. So even that I know ASP.NET MVC is the way to go, I want to start with some simple applications with ASP.NET Webforms and then advance to MVC logic. Also regarding my db classes: I plan to create common database classes in order to be able to use them either from WinForms or ASP.NET applications. I also know that the way to go is to learn about ORM and EF. BUT I also want to start from where I am feeling comfortable and that is the traditional ADO.NET way. So about my Data Access Layer classes: Should I return my results in datasets or arraylists/lists? Should my methods do their own connect/disconnect from the db, or have separate methods and let the application maintain the connection?

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• .NET Libraries Cost More Than Windows?

  - by Kevin Mark

  When looking into libraries to make my programming life a little bit easier I've (almost) always been disappointed by the prices offered. For instance, Actipro's WPF Studio is $650. I suppose that's worth it if you plan to make money from the use of those controls. But take a look at, say, Windows. Windows 7 Ultimate is just about $220. I consider Windows to be a far more complex and "worth-it" product/purchase than a library that runs on it. Why the significant difference in pricing? Do libraries really need to be so expensive, or do they need to charge more in order to make a decent some of money?

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• Need Japanese IME with Dvorak keyboard with 13.10

  - by user916792

  I recently did a fresh install of 13.10 and enabled Japanese language support. In the past this seemed to work seamlessly with my other keyboard settings when I set up my Dvorak keyboard. But this time when I toggle the IME on it uses the standard QWERTY layout. Typing English uses the Dvorak layout as I expect. This just worked for me in the past to the point where I stopped paying attention to what the underlying IME is and I don't recall any special steps other then choosing my keyboard layout and enabling Japanese. Any help would be appreciated!

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• Expressing the UI for Enterprise Applications with JavaFX 2.0 FXML - Part Two

  - by Janice J. Heiss

  A new article by Oracle’s Java Champion Jim Weaver, titled “Expressing the UI for Enterprise Applications with JavaFX 2.0 FXML -- Part Two,” now up on otn/java, shows developers how to leverage the power of the FX Markup Language to define the UI for enterprise applications. Weaver, the author of Pro JavaFX Platform, extends the SearchDemoFXML example used in Part One to include more concepts and techniques for creating an enterprise application using FXML. Weaver concludes the article by summarizing its content, “FXML provides the ability to radically change the UI without modifying the controller. This task can be accomplished by loading different FXML documents, leveraging JavaFX cascading style sheets, and creating localized resource bundles. Named parameters can be used with these features to provide relevant information to an application at startup.” Check out the article here.

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• Windows Phone 7 dev: C# or silverlight for a simple app?

  - by OneWorld

  I'm about to hire a programmer to develop Windows Phone 7 apps. The current app that shall be developed is quite simple. The app will download content from a Web-API. There are two lists to select content. There is a single item content page. Users can rate the content and upload photos. The screens will be produced by our artist. I am pretty sure that most of the available programmers haven't touched WP7 development yet. Now the questions are: What technology is suitable for this kind of app? What technology requires less research, learning and production time? Do you already have experience of limitations of silverlight compared to C#? (I am also thinking of future projects) My guess is that silverlight programmers are more experienced in UI programming than C# coders. Do you feel the same way?

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• Choosing a subject to create a site for

  - by Daniel

  For 6 years I'm working as web developer and I would like to finally create my own site. I thought I have everything needed: programming and administration skills, found a good designer, own servers and understanding how to operate site. But I've missed very important (or the most important) point: how do I find a subject for my site? My hobby and my work are the same: IT, but I don't want to create just another tech blog or news aggregator, I want something different. First I thought things like Google Trends or Google top 1000 could help, but I've got lost in thousands of options I can't see them all (I actually can, but it'll take at least a couple of month). So my question is: how did you start? Where did you get the idea?

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• Liskov substitution and abstract classes / strategy pattern

  - by Kolyunya

  I'm trying to follow LSP in practical programming. And I wonder if different constructors of subclasses violate it. It would be great to hear an explanation instead of just yes/no. Thanks much! P.S. If the answer is no, how do I make different strategies with different input without violating LSP? class IStrategy { public: virtual void use() = 0; }; class FooStrategy : public IStrategy { public: FooStrategy(A a, B b) { c = /* some operations with a, b */ } virtual void use() { std::cout << c; } private: C c; }; class BarStrategy : public IStrategy { public: BarStrategy(D d, E e) { f = /* some operations with d, e */ } virtual void use() { std::cout << f; } private: F f; };

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• 2d shapes in XNA 4.0?

  - by Lautaro

  Having some experience of XNA but none of 3D programming. I have an idea i want to realize but i have not decided to do it in 3d or 2d. Im not sure which one will be best in XNA. I want to have a shape like a blob that can reshape depending on input. The morphing does not need to be very advanced. It could be a circle (2d) or globe (3d) that just has one point that moves slightly in a random direction. In ASP.NET i have made this through the 2d Draw classes where i can make lines, circles, squares etc and then modify the points that makes them up. But it seems to me that XNA does not have classes for making 2d shapes (can i get this confirmed?). If it had, then this would be the quickest solution for me.

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• Keyboard shortcuts don't work continuously

  - by T. K.

  First I had the problem of the keyboard layout resetting itself on each reboot from DE (german) to EN (us). I followed the advice of using dconf in order to make the DE layout my personal default (see Keyboard layout switches to English each time I reboot). However, after that, my shortcuts didn't work properly anymore. In Firefox, Kile etc. everything works fine while in Nautilus, copying/erasing/pasting is impossible even when I change the keyboard layout back to En (us). Also, I'm not even able to select multiple items using the cursor in Nautilus while every acts normal on the desktop. It's quite confusing. I've read about a similar bug (see https://bugs.launchpad.net/unity/+bug/1226962) but since German is a latin language there is no appropriate solution given for my problem. Any help is really appreciated here. Edit: The third reboot resolved the problem so the shortcuts finally work in Nautilus again. Still, selecting multiple objects using the cursor isn't possible.

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