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  • Java - JPA - @Basic and @Embedded

    - by Yatendra Goel
    I am learning JPA from this tutorial. I have some confusions in understanding the following annotations: @Basic @Embedded Fields of an embeddable type default to persistent, as if annotated with @Embedded. If the fields of embeddable types defualt to persistent, then why would we need @Embedded

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  • Vim error E492: Not an editor command: dd

    - by Roberts Jameson
    I started learning vim today and installed it using sudo apt-get install vim Now, when I try to do something like :5dd it gives me the not an editor command error. I'm not sure why this is. Am I doing anything wrong? I looked at tutorials and everywhere I look I see that 5dd is a valid command.

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  • What is the best way to use whitespace while programming?

    - by Emmanuel Smith
    I'm fairly new to programming and from learning I have seen different ways of formatting code, comments, etc; and have been recommended on different techniques. I mostly program in C#, C++, and Java so I want to know what is the the best way to layout code so that if other people where to go through it, they would be impressed by how simple and easy to understand it is. I would like to know the same thing for commenting as well.

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  • Help me decipher this output

    - by Bragaadeesh
    Hi, I have started learning Ruby recently and I was trying out the following piece of code. a=[1,2] b='slam dunk' a.each { |b| c=a*b; puts c;} I am getting the following output. I have no clue why. I expected an error or something to be thrown. Can someone explain me why this happens? 1 2 1 2 1 2 Thanks

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  • C# Object Declarations

    - by pm_2
    Are there any overheads to using the following sytax: Form1 myForm = new Form1(); myForm.Show(); As opposed to: Form1 myForm; myForm = new Form1(); myForm.Show(); When I was learning VB6, I was told doing the quivelent in VB had an overhead - is the same true in .NET?

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  • Comparing Flash, HTML, Silverlight, X3D and Unity 3d

    - by Amira Elsayed
    I have to prepare a comparison between the following technologies to present it to my Project Manager, but I fell that I'm lost, so if any one can help I will be thankful I want to compare between them in the following areas: the support of online video streaming the budget of using each one Learning Time will be needed to learn the technology Which one is the standard and will target a lot of users The support if I found any problem Bugs and security issues connection to DB, SOA and web services supporting of multi player

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  • How does Python differentiate between the different data types?

    - by wrongusername
    Sorry if this is quite noobish to you, but I'm just starting out to learn Python after learning C++ & Java, and I am wondering how in the world I could just declare variables like id = 0 and name = 'John' without any int's or string's in front! I figured out that perhaps it's because there are no ''s in a number, but how would Python figure that out in something like def increase(first, second) instead of something like int increase(int first, int second) in C++?!

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  • Dynamic adding HttpModules and HttpHandlers

    - by pokrate
    Hi, Is adding / removing HttpModules and HttpHandlers at runtime from a website a good idea ? I am looking at ways to make my website as dynamic as possible without uploading changed content all over again. Something like config files. Rule engines exist, but learning them seems like a pain. I might be wrong in my perspective. Please suggest possible ways to change logic in the code at runtime.

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  • Dev-C++ Run Program in Background without GUI

    - by Lienau
    I recently began learning C++ in order to reach people w/o .net. I need to run my program in the background(without any visual indication to the user so no window or cmd). I know there a various methods to do this In C#, but I don't know how to do this in C++ (specifically Dev-C++). Any help is greatly appreciated.

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  • What should I do during the summer?

    - by zamN
    I have just recently graduated from High School and I am looking for something productive to do over the summer. I was thinking of possibly learning a new language that can give me an edge in school or a good project to pursue that will look good on my resume for future jobs. Also how would I go about getting a job right out of high school or interning for a company for the summer? Thanks in advance.

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  • Processing: popen() call to start subprocess?

    - by Mark Harrison
    Here's an example of opening and reading data from a TCP socket. Is there a a popen() call or equivalent that can start a child process and read its output? void setup() { c = new Client(this, "127.0.0.1", 12345); // Replace with your server's IP and port } void draw() { if (c.available() > 0) { input = c.readString(); http://www.processing.org/learning/libraries/sharedcanvasclient.html

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  • What's the best UML diagramming tool?

    - by eplawless
    I'm trying to choose a tool for creating UML diagrams of all flavours. Usability is a major criteria for me, but I'd still take more power with a steeper learning curve and be happy. Free (as in beer) would be nice, but I'd be willing to pay if the tool's worth it. What should I be using?

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  • Remove stateful EJB bean in client

    - by palto
    I'm currently learning EJB and as I understand when client gets a stateful session bean the server keeps it in memory(or passivates it) until the client removes the bean. Pretty simple, except nowhere I have seen any examples of how the client can actually remove the bean. How do you do that other than shutting down your client application? Or do I just have to implement a reset method in all my stateful beans if I want to start over?

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  • is c++ STL algorithms and containers same across platforms and performance?

    - by Abhilash M
    After learning good amount of c++, i'm now into STL containers and algorithms template library, my major concerns are, 1) Is this library same across different platforms like MS, linux n other os? 2) will quality or efficiency of program c++ module decrease with more use of STL containers and algorithms, i think i can't customize it to all needs. 3) Is this template library good to use in linux system programming, kernel modules? 4) lastly can i use this in programming contests, because it relives a lot of coding and pressure off shoulders.

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  • why make non-privileged methods?

    - by aharon
    I'm learning JavaScript, and I can't understand why you'd make methods that aren't 'privileged,' that is, that aren't defined in the constructor but rather the class' prototype. I understand the idea of encapsulation and all, but you never encapsulate parts of a class from the rest of it in most of the OO world.

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  • Where to learn about matrices?

    - by GummyBears
    I am programming in Ruby and have wanted to learn about matrices but I can't find any resources for actually learning about them. Are there any good tutorials on matrices and programming? It would be nice if it would be in ruby but other languages are fine too.

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  • Best editor for CodeIgniter?

    - by Rismo
    I'm learning CodeIgniter and I come from Microsoft Visual Studio so I'm used to the auto complete feature. I've been using notepad++ so far but I wonder if anyone knows an editor that works better with CodeIgniter. I would love to see features like: Right-click - Add new model Right-click - Add new view Autocomplete with CodeIgniter helpers and libraries

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