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• try .. catch blocks - when to use

  - by Konrad

  I have always been of the belief that if a method can throw an exception then it is reckless not to protect this call with a meaningful try block. I just posted 'You should ALWAYS wrap calls that can throw in try, catch blocks.' to this question and was told that it was 'remarkably bad advice' - I'd like to understand why. Thanks!

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• Why and what for: java enum

  - by Mat Banik

  Today I was browsing through some question on this site and I found mention of enum being used in singleton pattern and that there are some thread safety benefits to such solution. I never used enums and I have been programing in java for more than couple a years now. And apparently they changed a lot and now they even do full blown support of OOP within them selfs. Now why and what for should I used enum in day to day programing?

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• Java Synchronized function

  - by leon

  Hi I have a question. In the following code, if a thread were blocked at wait statement, and another thread attempts to execute foo(), would the hello wolrd message be printed? and Why? Many Thanks synchronized foo(){ system.out.println("hello world"); ..... wait(); ..... }

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• Stopping/Starting a remote Windows service and waiting for it to open/close

  - by ripper234

  The top answer to this question tells me how to stop/start a remote service. Great. Now, all I need is to wait for the actual stop/start to complete. So, what I'm looking for is a dos command to: Start a service, should return only after the service is started (or after a timeout, raising error level) Stop a service, return only after the service is stopped

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• OpenGL - GL_FRONT versus GL_FRONT_AND_BACK

  - by Drew Noakes

  I'm tinkering with an open source project that uses OpenGL for rendering in 3D. In the construction of the materials I see code like this: // set ambient material reflectance glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mAmbient); In other examples, this is used: glMaterialfv(GL_FRONT, GL_AMBIENT, mAmbient); So my question is, what is the difference here? Under what circumstances would it look different and, if my volume is enclosed with all normals pointing outwards, is there any performance difference?

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• OpenEntityManagerInViewFilter and testing the presence of an EntityManager

  - by James P.

  I posted a question a few days ago mentionning Spring's OpenEntityManagerInViewFilter: http://stackoverflow.com/questions/2385858/uirepeat-inside-a-uirepeat-and-lazyinitexception An obvious thing that should have been asked and now comes to mind is how to test for the presence of an EntityManager in a JSF project. What is a good way of doing this?

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• asp.net gridview editing

  - by George

  I have a gridview (Edit and Delete enabled) that shows a table. A Text Box and A Button. When I type something in the textbox and click the button, the button runs the datasource.filterexpression and filters out the rows. The question whenever I click on the edit button after the filter has been applied The grid auto resets back to the original table? How can I solve this?

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• Why is NULL/0 an illegal memory location for an object?

  - by aioobe

  I understand the purpose of the NULL constant in C/C++, and I understand that it needs to be represented some way internally. My question is: Is there some fundamental reason why the 0-address would be an invalid memory-location for an object in C/C++? Or are we in theory "wasting" one byte of memory due to this reservation?

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• @Transient property should be added in equals/hashCode/toString

  - by Castanho

  Hi there, this is a quick question........... In objects from JPA that is mapping a table, I have some properties that is @Transient, shall I add this properties into equals/hashCode/toString methods? My first thought is NO but.... I don't know why. Tips? Ideas? Explanations? Thanks in advance

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• What is this syntax #[] in REBOL?

  - by Gregory Higley

  In another question, I saw the following syntax: #[unset!] What is that? If I say type? #[unset!] in R3, it tells me unset!, but it doesn't solve the mystery of what #[] is. So curious.

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• Unit Testing a CSV Parser and Column Mapping Tool

  - by PieterG

  I am really starting to enjoy unit testing and have the following question to the gurus of unit testing. Let's for example say I have the following class public class FileMapper { public Dictionary<string, string> ReadFile(string filename, string delimeter){} } How do you guys generally go about unit testing a Parser or ReadFile method in my case?

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• is hashCode() must return a prime number

  - by subhashis

  The signature of the hashCode() method is public int hashCode(){ return x; } in this case x must be an int(primitive) but plz can anyone explain it to me that the number which the hashCode() returns must be a prime number, even number...etc or there is no specification ? the reason behind i am asking this question is i have seen it in different ids the auto generated code always returns a prime number, so i need to know why? thanks in advance

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• Retrieving currently playing song from Windows Media Player (C#)

  - by DMan

  I realize there is a similar question to this, but it really has no information in it. I want to retrieve the currently playing song title (similar to MSN Messenger) within a C# app. The Windows Media Player I want to control is EXTERNAL- that is, it is running on the computer, not within the app. Anyway to do this?

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• a constructor as a delegate - is it possible in C#?

  - by akavel

  I have a class like below: class Foo { public Foo(int x) { ... } } and I need to pass to a certain method a delegate like this: delegate Foo FooGenerator(int x); Is it possible to pass the constructor directly as a FooGenerator value, without having to type: delegate(int x) { return new Foo(x); } ? EDIT: For my personal use, the question refers to .NET 2.0, but hints/responses for 3.0+ are welcome as well.

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• Array of function pointers in Java

  - by Waltzy

  I have read this question and I'm still not sure whether it is possible to keep pointers to methods in an array in Java, if anyone knows if this is possible or not it would be a real help. I'm trying to find an elegant solution of keeping a list of Strings and associated functions without writing a mess of hundreds of 'if's. Cheers edit- 'functions' changed to 'methods', seems to bug people.

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• Which version of .NET 4.0 is needed for web site hosting? Client or Full?

  - by Pure.Krome

  Hi folks, Simple question - for dedicated website hosting, do i need to download and install the full ASP.NET 4.0 package, or just the client. I understand the client is required for end users who need the .NET framework for their windows form applications. But i'm not sure for a web hosting sceanrio. Also, don't worry about talking about x86 or x64 - i understand the differences with the packages, etc.

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• VB6 - View Code will not display code

  - by zSysop

  Hi all, This is probably a really dumb question but i'll ask anyway. I was wondering if there was any reason as to why a form wouldn't display its code when i click "view code" from the right click context menu in vb6? It was working awhile ago so i'm kind of stumped. Thanks

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• Does knowing a Natural Language well help with Programming?

  - by Earlz

  We all hear that math at least helps a little bit with programming. My question though, does English or other natural language skills help with programming? I know it has to help with technical documentation, but what about actual programming? Are certain constructs in a programming language also there in natural languages? Does knowing how to write a 20 page research paper help with writing a 20k loc programming project?

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• What's the new way to iterate over a Java Map in Scala 2.8.0?

  - by Alex R

  How does scala.collection.JavaConversions supercede the answers given here: http://stackoverflow.com/questions/495741/iterating-over-java-collections-in-scala (doesn't work because the "jcl" package is gone) and here http://www.eishay.com/2009/05/iterating-over-map-with-scala.html (doesn't work me in a complicated test which I'll try to boil down and post here later) The latter is actually a Scala Map question but I think I need to know both answers in order to iterate over a java.util.Map. Thanks

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• JQuery: Selector that contains some text, but doesn't contain others

  - by BPotocki

  Sorry if this question is mind numbingly easy to answer, but I'm a bit new to JQuery and I have a tight deadline. I am looking for a selector for textbox elements that have this format: id = "FixedName_#" "FixedName" will always be "FixedName", but I only want to find elements where the # is positive. So I would want to find "FixedName_1", and "FixedName_2" for example, but skip over "FixedName_-1" and "FixedName_-2". Thanks!

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• Get crashing application stack trace

  - by Tony

  Is there any program that anyone knows off (not a debugger) that will produce a stack trace of a crashing application? The application crash can be simulated at will on a server on which I cannot necessarily install a debugger. That's why the question if there's no other way to get a stack trace so I can then have a look.

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• Does changing background color in android destroy the widget's appearance?

  - by cibercitizen1

  I've noticed that changing the background color of an android widget (f.ex. Button or TextView) by program: myButton.setBackgroundColor(Color.BLUE); makes it to loose its 3D shape, border, and shadows effects, and then appears like a ugly flat square. What am I missing? Sorry for the very naive question but I couldn't get it right although tried for a time.

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• how can i disable label or label from ib after displaying text on to it

  - by ven in Iphone world

  hi i would like to ask one intresting question i should disable or remove label from my view when certain event ocuurs how can i disable it can any one give me a syntax for that one i hope i will get answer

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• How do I customize a table view?

  - by Nathan

  Interface Builder Question I know there's a way to change the background color of a table, but is there a way to change the text color? Please Help

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• What are the most popular version control softwares and why?

  - by gnucom

  Hey Everyone, I'm an employee at a small company that is going to be launching a version control system soon and I'm trying to consider which software would best serve this company for version control. I wanted to get as many opinions as possible. Right now, I'm experimenting with Trac and Indefero running atop a SVN server. So my question is, what is the most popular/favorite version control software and why? ??t??!

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