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  • What's the reason exceptions are heavily used in managed (C# and Java) languages but not in C++? [on hold]

    - by ZijingWu
    AFAIK, a lot of C++ projects don't allow exceptions and deny them in coding guidelines. I have a lot of reasons, for example, exception is hard to handle correctly if your binary needs to be compiled by separate and different compilers. But it doesn't fully convince me, there is a lot of projects which are just using one compiler. Compared to C++, exceptions are heavily used in C# and Java and the reason can only be that exception are not bringing enough benefit. One point is debugbility in practice. Exception can not get the call stack in C++ code, but in C# and Java you can get the call stack from exception, it is significant and makes debugging easier. No-callstack is not the fault of the exception, it is the language difference, but it impacts the exception usage. So what's the reason that exceptions are frowned upon in c++ programs?

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  • Practices for domain models in Javascript (with frameworks)

    - by AndyBursh
    This is a question I've to-and-fro'd with for a while, and searched for and found nothing on: what're the accepted practices surrounding duplicating domain models in Javascript for a web application, when using a framework like Backbone or Knockout? Given a web application of a non-trivial size with a set of domain models on the server side, should we duplicate these models in the web application (see the example at the bottom)? Or should we use the dynamic nature to load these models from the server? To my mind, the arguments for duplicating the models are in easing validation of fields, ensuring that fields that expected to be present are in fact present etc. My approach is to treat the client-side code like an almost separate application, doing trivial things itself and only relying on the server for data and complex operations (which require data the client-side doesn't have). I think treating the client-side code like this is akin to separation between entities from an ORM and the models used with the view in the UI layer: they may have the same fields and relate to the same domain concept, but they're distinct things. On the other hand, it seems to me that duplicating these models on the server side is a clear violation of DRY and likely to lead to differing results on the client- and server-side (where one piece gets updated but the other doesn't). To avoid this violation of DRY we can simply use Javascripts dynamism to get the field names and data from the server as and when they're neeed. So: are there any accepted guidelines around when (and when not) to repeat yourself in these situations? Or this a purely subjective thing, based on the project and developer(s)? Example Server-side model class M { int A DateTime B int C int D = (A*C) double SomeComplexCalculation = ServiceLayer.Call(); } Client-side model function M(){ this.A = ko.observable(); this.B = ko.observable(); this.C = ko.observable(); this.D = function() { return A() * C(); } this.SomeComplexCalculation = ko.observalbe(); return this; }l M.GetComplexValue = function(){ this.SomeComplexCalculation(Ajax.CallBackToServer()); }; I realise this question is quite similar to this one, but I think this is more about almost wholly untying the web application from the server, where that question is about doing this only in the case of complex calculation.

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  • what's the overhead when allocating objects/arrays in Java?

    - by Gnijuohz
    How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 byte is called overhead, but didn't explain it. Also objects have overheads, which is 16 bytes. What exactly are these overheads? Also, do these overheads only exist in Java? How about C, C++ and Python?

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  • Managed game frameworks with Model loading support [on hold]

    - by codymanix
    Iam looking for an alternative to XNA with support of model loading. Does anybody know when/if there if a MonoGame release is planned which includes its own content pipeline which works without XNA beeing installed? If not, what are the alternatives in managed game development? As far as I know, SlimDX and SharpDX on its own brings no functionality for loading models. Are there any open source libraries that can do that?

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  • How to integrate Java ME SDK 3.2 with Eclipse

    - by SungmoonCho
    Here is also an instruction on how you can integrate Java ME SDK 3.2 with Eclipse. You need additional steps for Eclipse Juno, because it does automatically detect and download MTJ (Mobile Tools for Java) plugin. The following instruction is for Eclipse Indigo. 1. Download Java ME SDK and Eclipse plugins from here. 2. Install Java ME SDK 3. Launch Eclipse 4. Go to "Help" - "Install New Software" 5. Click "Archive", and choose the Eclipse Plugin zip file you downloaded. Name is something like "Java ME SDK Plugin" 6. Choose Java ME SDK Tools, and select "Next". 7. It will calculate requirements and dependencies. Simply follow the instruction. 8. You may also have to manually install the platform. Check out "Help" - "Preferences" - "Java ME" - "Device Management". If you do not see Java ME SDK 3.2 devices, click "Manual Install" on the right side, and specify the folder where Java ME SDK is installed. By default, it is installed at "C:\Java_ME_platform_SDK_3.2". 9. You're done. Now you can use the Java ME SDK plugins for Eclipse.

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  • Confused about my future. Doubt about .Net or Java way.

    - by dotNET
    I'm very confused about choosing the programming langage to follow in the next step of my life. I'm right now so familiar with C++, VB.NET and PHP, but to jump to a higher level I must choose between JEE(JSP, Servlets, JSF, Spring, EJB, Struts, Hibernate,...) and .NET(ASP.NET, C#). Because I cant learn them at the same time. And you realize that, when I mentioned JEE a lot of things comes to the head. In my personnal experience I prefere the .NET, but Java seems to be a better choice. believe me, i'm not writing a subjective topic. I just want to know what must I follow to get succes in my life. The question here is : Is there any things that can be done with Java, and cannot be done with .NET. Is there any chances that I can follow the uncounted number of frameworks that are always in developpement. ... (also something not said) ?

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  • Technical Article: Experimenting with Java Timers

    - by Tori Wieldt
    OTN's new tech article is "Experimenting with Java Timers" by T. Lamine Ba. This article studies time—how Java handles timers and the scheduling of tasks. Java timers are utilities that let you execute threads or tasks at a predetermined future time, and these tasks can be repeated according to a set frequency. The article starts with a simple "Hello World" program in a web application that's composed of JavaServer Pages (JSP) and uses the model-control-view (MVC) design pattern. The IDE used in this article is NetBeans IDE 7.1, but you can use any IDE that supports Java. "Experimenting with Java Timers" demonstrates how to get started scheduling jobs with Java. To learn about Swing timers, check out the Java tutorial "How to Use Swing Timers" and additional information in the Java Platform, Standard Edition 7 API Specification for Class Timer. 

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  • Frameworks for targetting multiple environments

    - by Werlang
    What should drive the decision behind doing development upon one or more than one framework? For instance, an ERP is (mostly) run on a Windows station. It leverages full access to device's resources, like printers, barcode readers, fingerprint readers and the like. It's usually more responsive and easier do develop with. That being said, some parts of it must be accessed exclusively in self-service mode, by enterprise's customers, suppliers and partners. This could be accomplished with smartphones, tablets, or even desktops running a web browser. What are the economics behind that? Should two team be kept, each one doing work upon its own framework? Or the most permissive framework should be chosen? Should I care something other than HTML technologies? Should I consider native technology for each device?

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  • How do you learn to effectively use more than one framework

    - by LongTTH
    Someday, my leader told me that don't reinvent the wheels, use framework built-in classes. (with a serious mood) when I implement some algorithm has been supported by .NET fx. And seriously, I didn't know about these support before, cause this is the first time I work with .NET). So I have this questions. For example, for building an Web-App we have some ways: C# with ASP.NET framework Java with JavaEE (and friends like Struts, Spring v.v.) framework. PHP with Zend framework. ... It just takes about 1 months to learn language (C#, Java, PHP...), BUT learning to use a framework effectively takes you at least SOME YEARS working (to know every bit of code has been built-in). So, how do you learn to use effectively 2 (or more) frameworks? Any ideas are welcome!

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  • How do you usually manage callbacks in Java using Swing library?

    - by none
    I'm quite new to the Java Swing programming, and GUI development as well. As a beginner, I'm currently reading Design Pattern, but finding what I'm looking for is quite hard, most of the times. So far, I've never had huge problems defining a view hierarchy - I just use to subclass component from component. But the hard-to-do here is how managing callbacks, which often become hard to maintain due to the hard code. During my last projects, I tried to separate GUI, Listener and Callbacker objects which cooperated together, but in this way it was really hard adding new features. So, which kind of best patterns or best practices do you tend to use when trying to maintain, add new features or even worst avoid to hard-code classes which manage callbacks method in this kind of frameworks (mainly Java Swing)?

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  • where can i learn to make 3d games in java from scratch?

    - by dfhgdfnhgfn
    Just wondering if anyone knows of anything i can read or watch that explains 3D graphics. i do not want to use any game engine like jogl etc. but i am looking for a way i can learn in detail how 3D works. preferably in java. I have used some game engines but would prefer to learn to make for myself. I would also like to do it without the java3d library. I have also watched some tutorials on 3d games in java, but would like to learn in more detail. Thanks.

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  • Java and Eclipse setup properly, how do I install JOGL or LWJGL?

    - by shadowprotocol
    I have my Java environment installed alongside Eclipse, and I was successfully able to create and run a new project (simple System.out.println("Yay I work!"); I have the OpenGL SuperBible, and I primarily want to code 3D things (I'll take my time using the book to learn how to draw shapes in 3D space, etc..) Can you help me get setup with OpenGL in Java? I dont really need LWJGL, although I WILL make games eventually. I just can't even figure out with all of these terrible (and old) tutorials floating around on the net how to install either JOGL or LWJGL. If you can give me a hand with that, I'd appreciate it. I'd like to feel I contributed by having this page show the answer to the question, so that other poor souls googling for this same information can benefit.

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  • How do I find a unit vector of another in Java?

    - by Shijima
    I'm writing a Java formula based on this tutorial: 2-D elastic collisions without Trigonometry. I am in the section "Elastic Collisions in 2 Dimensions". Part of step 1 says: Next, find the unit vector of n, which we will call un. This is done by dividing by the magnitude of n. My below code represents the normal vector of 2 objects (I'm using a simple array to represent the normal vector). int[] normal = new int[2]; normal[0] = ball2.x - ball1.x; normal[1] = ball2.y - ball1.y; I am unsure what the tutorial means by dividing the magnitude of n to get the un. What is un? How can I calculate it with my Java array?

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  • Why shouldn't I be using public variables in my Java class?

    - by Omega
    In school, I've been told many times to stop using public for my variables. I haven't asked why yet. This question: Are Java's public fields just a tragic historical design flaw at this point? seems kinda related to this. However, they don't seem to discuss why is it "wrong", but instead focus on how can they use them instead. Look at this (unfinished) class: public class Reporte { public String rutaOriginal; public String rutaNueva; public int bytesOriginales; public int bytesFinales; public float ganancia; /** * Constructor para objetos de la clase Reporte */ public Reporte() { } } No need to understand Spanish. All this class does is hold some statistics (those public fields) and then do some operations with them (later). I will also need to be modifying those variables often. But well, since I've been told not to use public, this is what I ended up doing: public class Reporte { private String rutaOriginal; private String rutaNueva; private int bytesOriginales; private int bytesFinales; private float ganancia; /** * Constructor para objetos de la clase Reporte */ public Reporte() { } public String getRutaOriginal() { return rutaOriginal; } public String getRutaNueva() { return rutaNueva; } public int getBytesOriginales() { return bytesOriginales; } public int getBytesFinales() { return bytesFinales; } public float getGanancia() { return ganancia; } public void setRutaOriginal(String rutaOriginal) { this.rutaOriginal = rutaOriginal; } public void setRutaNueva(String rutaNueva) { this.rutaNueva = rutaNueva; } public void setBytesOriginales(int bytesOriginales) { this.bytesOriginales = bytesOriginales; } public void setBytesFinales(int bytesFinales) { this.bytesFinales = bytesFinales; } public void setGanancia(float ganancia) { this.ganancia = ganancia; } } Looks kinda pretty. But seems like a waste of time. Google searches about "When to use public in Java" and "Why shouldn't I use public in Java" seem to discuss about a concept of mutability, although I'm not really sure how to interpret such discussions. I do want my class to be mutable - all the time.

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  • JUnit, Jenkins et Git seraient les outils préférés des développeurs Java, Java 8 adopté par 7% de développeurs

    JUnit, Jenkins et Git seraient les outils préférés des développeurs Java Java 8 adopté par 7% de développeurs, tandis que 26% utilisent encore Java 6L'écosystème Java dispose d'un nombre important d'outils et de piles logiciels qui sont utilisés au quotidien par les développeurs dans leurs applications.ZeroTurnaround, une entreprise spécialisée dans le développement d'outils à destination des développeurs Java, vient de publier son rapport annuel sur les outils et technologies de développement Java.L'étude...

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