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• Why should I declare a class as an abstract class?

  - by Pied Piper

  I know the syntax, rules applied to abstract class and I want know usage of an abstract class Abstract class can not be instantiated directly but can be extended by other class What is the advantage of doing so? How it is different from an Interface? I know that one class can implement multiple interfaces but can only extend one abstract class. Is that only difference between an interface and an abstract class? I am aware about usage of an Interface. I have learned that from Event delegation model of AWT in Java. In which situations I should declare class as an abstract class? What is benefits of that?

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• Why I LOVE Dell

  - by Robert May

  We recently ordered a laptop for an employee.  It was delivered yesterday and we realized it had no web cam and wasn’t the 1080p resolution.  He wasn’t happy. So, this morning, I sent an e-mail to our rep and asked him what we could do.  Within an hour or two, he called me, arranged a replacement laptop with the corrected specs, set up a return and had everything arranged and charged us only for the difference.  No pain, no silly questions.  We won’t loose use of the laptop either.  The return and the new laptop will overlap so that we can just pack up the old laptop in the box of the new one, slap some labels on and away we go. This has been my experience with Dell over the past 10 years.  Their corporate service has always been fantastic, and it’s made me a huge fan.  Keep up the good work, Dell! Technorati Tags: Dell

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• Xubuntu Mail Watcher (XFCE Plugin) Won't Connect To IMAP

  - by Xophmeister

  I am trying to get the XFCE Mail Watcher panel plugin to check my IMAP mail, but it won't connect to my server. I have entered the details correctly -- they're exactly the same as those I use in Thunderbird -- but nothing! When I go to select the "New mail folders..." it returns with "Failed to get folder list". If I change my username from name@domain to name, I still get this error, but it takes a few seconds longer to appear. Nothing shows up in the log. If it makes a difference, my mail is hosted by Microsoft, in some way. Like I say, I can access it through Thurderbird using the IMAP credentials; but I have the Exchange 2010 web app, if I use webmail. Could this be the problem? (Thunderbird often complains with "Command Error. 12" with what it gets back from the server, but carries on regardless.)

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• Removing an element not currently in a list: ValueError?

  - by Izkata

  This is something that's bothered me for a while, and I can't figure out why anyone would ever want the language to act like this: In [1]: foo = [1, 2, 3] In [2]: foo.remove(2) ; foo # okay Out[2]: [1, 3] In [3]: foo.remove(4) ; foo # not okay? --------------------------------------------------------------------------- ValueError Traceback (most recent call last) /home/izkata/<ipython console> in <module>() ValueError: list.remove(x): x not in list If the value is already not in the list, then I'd expect a silent success. Goal already achieved. Is there any real reason this was done this way? It forces awkward code that should be much shorter: for item in items_to_remove: try: thingamabob.remove(item) except ValueError: pass Instead of simply: for item in items_to_remove: thingamabob.remove(item) As an aside, no, I can't just use set(thingamabob).difference(items_to_remove) because I do have to retain both order and duplicates.

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• Servlet : Usage of Constants.java class vs context param

  - by Pongsakorn Semsuwan

  I'm just wondering whether to keep some of my variables in Constants class or keep it in web.xml Say, I want to keep a variable of Facebook graph API prefix or api_key, client_id From my understand, the difference between Constants.java and web.xml is web.xml is easier to rewrite on compile using ant. So, you can replace your variables in web.xml according to what environment you are building you app for. (client_id varies by development environment/production environment, for example) If I understand it right, then Facebook graph API prefix should be kept in Constants.java (because it always is "https://graph.facebook.com/") and api_key, client_id should be kept in web.xml? What's the proper way to use them?

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• 50 Years of Space Exploration [Infographic]

  - by Jason Fitzpatrick

  We’ve sent over 200 missions out into space to check out the Moon, the Sun, planets, and more. Curious where they all went? Check out this awesome infographic to trace the launches to their destination. The infographic includes all international missions including visits to the Sun, observation orbits around the Earth, the Moon, other planets in our solar system, visits to asteroids, and the adventures of deep space probes like Voyager 1. The official image at National Geographic is trapped inside a clunky viewfinder style image viewer. If you want to look at the whole thing more comfortably or use it for desktop wallpaper, make sure to visit the full size image at Simple Complexity here. 50 Years of Exploration [National Geographic via Simple Complexity] How to Enable Google Chrome’s Secret Gold IconHTG Explains: What’s the Difference Between the Windows 7 HomeGroups and XP-style Networking?Internet Explorer 9 Released: Here’s What You Need To Know

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• Easy Server-Side Language

  - by Nizar

  Most of programming languages (Server-side languages for web development) needs a learning curve and requires some time to learn. However, I'm sure there is a difference between them. So, for example you can master the 'X' language in less time than the 'Y' language. I'm a beginner in web development, meaning that I just know HTML and CSS and now want to choose the right tool for building dynamic sites. What I'm looking for is a language that is easy to master in less time than other languages. So, is there a language that can suit my needs? If so, please let me know about what should I learn in it? (for example, which frameworks?, libraries?, IDEs?, databases?, etc). In the end, I don't want to regret my choice of the language and want to learn solid basics in it and in programming in general.

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• Hard Disk Spins Down as long as Battery is in Laptop

  - by Brock Dute

  Hi, I just figured out today that as long as the battery is in my laptop, it doesn't matter if it's fully charged while plugged in, Ubuntu always spins down my hard drive. I noticed this because there was a huge difference in speed when I removed the batteries. My settings for power management is basically: on AC power, don't spin down harddrive, dont suspend or anything on battery power, basically save as much power as possible I assumed that if I plug in my laptop, it'll use the On AC Power settings no matter what but apparently, this isn't so. Is there a way to "fix" this?

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• hp XW8000 work station power supply

  - by user281745

  My power supply went up in the XW8000 and I bought a new corsair cx500. I installed it but when I hook it up and I turn the computer on I get a beeping noise from the computer. I looked at the old power supply and the new power supply. The only difference is that the new power supply has 500 watts and the old one is 450 watts and the old PSU has a brown wire and the new power supply has 2 orange wires at the end. I found out that it is a sense wire that is in a different location so I was wondering how do I fix this problem.

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• Thinktecture IdentityServer Azure Edition RC

  - by Your DisplayName here!

  I found some time over the holidays to finalize the Azure edition of IdentityServer. http://identityserver.codeplex.com/releases/view/81206 The biggest difference to the on-premise version (and earlier Azure betas) is, that by default IdSrv now uses Azure Storage for all data storage (configuration & user data). This means that there is no need anymore for SQL Azure (which is still supported out of the box – just not the default anymore). The download includes a readme file with setup instructions. In a nutshell: Create a new hosted service and upload your certificates Modify the service configuration file in the download to your needs (signing cert, connection strings to storage…) Deploy the package via the portal or other tools Use the new Powershell scripts to add users If you encounter any problem, please give me feedback.

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• Ubuntu 12.10 live-usb won't boot

  - by user109175

  I own an Aleutia "Tango" low power PC. It uses a Intel Atom CPU N2800 @1.86GHz processor. I know there are Linux issues with the "Cedar Trail" graphics on this hardware but I can happily run Ubuntu 12.04 using the VESA graphics driver. I wanted to try out Ubuntu 12.10 so I created a live USB under 12.04 but I am unable to get this to boot. It gets as far as the Grub screen but after that the monitor shuts down. I have tried the F6 "nomodeset" option but that doesn't make any difference. Does anyone have any knowledge of this problem? Thanks in advance.

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• Why distance field text rendering have clear outline?

  - by jinhwan

  http://www.valvesoftware.com/publications/2007/SIGGRAPH2007_AlphaTestedMagnification.pdf All the process for doing distance rendering is clear, but 'how does it work' is not clear for me. It looks like that distance field pixels which are created around original pixel may affect 2d texture sampling interpolation process. But I can't understand the interpolation process. I've read that the distance field rendering is processed under nearest-neighbour interpolation. If it is true, shouldn't the distance field redering creates non interpolated result? In my thought, they should looks liked retro style pixel art. Where do i misunderstand in this process? So far, It is no difference with alpha test for me. Both of them throw away all pixcel which are not in. How does extra distance field pixel affect rendering under nearest-neighbour interpolation?

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• E-commerce + CMS: 2 sites or one?

  - by Guandalino

  Ok, let's say that a customer already has a CMS managed web site but now wants to sell goods online using an E-commerce platform (Magento in this case). My question is, does it make any difference between choosing to have just one site running both CMS and E-commerce (www.mycompany.com, or to have one site for the CMS (www.mycompany.com) and another (www.mycompany-shop.com) for E-commerce? I'd like to know the pros and cons of these approaches, so that I can advice the customer for the best. --EDIT I forgot to say that I'd prefer to have 2 separated web sites. This way I shouldn't have to learn how to integrate them together (one in Python, the other in PHP).

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• HTG Explains: What Is Windows RT and What Does It Mean To Me?

  - by Chris Hoffman

  Windows RT is a special edition of Windows 8. It runs on ARM and you’ll find it alongside Intel x86 machines in stores, but you’ll be surprised just how much Windows RT differs from the Windows you know. Windows RT is so different  that Microsoft has told Mozilla Windows RT “isn’t Windows anymore.” If you’re looking to buy a Windows system in stores, you should know the difference between Windows RT and the other editions of Windows 8. Image Credit: Kiwi Flickr HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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• Installed fprint, can't login anymore

  - by Otto

  Tried Fprint, was stupid enough not to backup the common-auth file before changing it. Somehow I'm locked out of the system, trying to fingerscan doesn't do any difference. Even when I've done it 5 times and it asks for password, when it asks for password and I write it in and it says that it's the wrong password. I use the same password for root as for my user. Tried to go into Recovery Mode - root - sudo nano /etc/pam.d/common-auth and remove the rows saying that you need the fingerprint to login, but when I try to overwrite, it says the file is read only, even when I try to open it with root. I have a lot of schoolwork files and programs on the system, so I can't afford losing them. Help?

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• Launcher icon differences in pixels between monitors usign same resolution

  - by Luis Alvarado

  Today I got to test a Samsung SyncMaster 2043nwx. My normal monitor was a 1080p Soniview TV that supports 1920x1080. I use 1680x1050 (16:10) as my common resolution. My amazed is when I see that the launcher icons looks more to a "correct size" of 32px to what they show in my Soniview where they actually take about 50% more using the same resolution. They are both the same resolution but in the Soniview the launcher icons look 50% bigger than the ones in the Samsung. My question is then, why the difference between both monitors since they are using the same resolution but are showing different launcher icon sizes.

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• Share on Facebook does not show thumbnail images

  - by matt74tm

  I have a PHP application which has a "Share on Facebook" button that, On the development server shows the thumbnail images correctly and allows the user to select between them On the live server, it does NOT show the thumbnail images at all. The relevant portion of the .htaccess file is: # Set up caching on media files for 2 days <FilesMatch "\.(gif|jpg|jpeg|png|flv)$"> ExpiresDefault A172800 Header append Cache-Control "public" </FilesMatch> I'm using the exact same set of php files and .htaccess, but the server configuration is different. What could be causing this? Note that the text appears fine. Edit1 We are also doing some URL rewriting related to images in the .htaccess (on both servers): ... RewriteRule ^.*/content/image/(.*)$ content/image/$1 [L] ... RewriteRule ^.*/images/(.*)$ images/$1 [L] ... Would that be somehow making a difference? Images appear fine all throughout the site. (I posted this question earlier as http://stackoverflow.com/questions/4142597/share-on-facebook-does-not-show-thumbnail-images) )

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• How to devise instruction set of a stack based machine?

  - by Anindya Chatterjee

  Stack based virtual machines like CLR and JVM has different set of instructions. Is there any theory behind devising the instruction set while creating a virtual machine? e.g. there are JVM instruction sets to load constants from 0-5 onto the stack iconst_0 iconst_1 iconst_2 iconst_3 iconst_4 iconst_5 whereas in CLR there are instruction set to load number from 0 to 8 onto the stack as follows ldc.i4.0 ldc.i4.1 ldc.i4.2 ldc.i4.3 ldc.i4.4 ldc.i4.5 ldc.i4.6 ldc.i4.7 ldc.i4.8 why there is no ldc.i4.9 and if ldc.i4 is there why we need the above opcodes? And there are others like these. I am eager to know what is the reason behind this difference between opcodes of different VMs? Is there any specific theory to devise these opcodes or it is totally driven by the characteristics of the VM itself or depends on the high-level language constructs?

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• Is it a good practice to use smaller data types for variables to save memory?

  - by ThePlan

  When I learned the C++ language for the first time I learned that besides int, float etc, smaller or bigger versions of these data types existed within the language. For example I could call a variable x int x; or short int x; The main difference being that short int takes 2 bytes of memory while int takes 4 bytes, and short int has a lesser value, but we could also call this to make it even smaller: int x; short int x; unsigned short int x; which is even more restrictive. My question here is if it's a good practice to use separate data types according to what values your variable take within the program. Is it a good idea to always declare variables according to these data types?

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• Les débits annoncés par les FAI dans leurs publicités sont-ils mensongers ? Faut-il afficher des vitesses plus proches de la réalité ?

  Les débits annoncés par les FAI dans leurs publicités sont-ils mensongers ? Faut-il modifier ces "jusqu'à" pour afficher des vitesses plus proches de la réalité ? C'est une pratique courante. Dans leurs publicités, les FAI affichent ostensiblement un débit pour vanter leurs offres. Mais, lorsque vous y regardez de plus près, vous apercevez les petits caractères "jusqu'à". Ceci vous indique que le la vitesse annoncée n'est en fait qu'un maximum théorique, et pas ce que vous aurez dans votre salon. Une différence qu'une majorité de consommateurs ne saisit pas. Outre manche, une procédure est actuellement en cours pour tenter de bannir ce type d'accroche des publicités liées aux offres haut débit. L...

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• Is there any research about daily differences in productivity by the same programmer?

  - by Rice Flour Cookies

  There has been a flurry of activity on the internet discussing a huge difference between the productivity of the best programmers versus the productivity of the worst. Here's a typical Google result when researching this topic: http://www.devtopics.com/programmer-productivity-the-tenfinity-factor/ I've been wondering if there has been any research or serious discussion about differences in day-to-day productivity by the same programmer. I think that personally, there is a huge variance in how much I can get done on a day by day basis, so I was wondering if anyone else feels the same way or has done any research.

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• What are the most important programming skills you need to improve as a team Leader or project manager?

  - by Aba Dov

  I decided to ask this question after I read the valuable answers to the great question What is the single most effective thing you did to improve your programming skills? and after attending Ad Burns "Secrets of a rock star programmer". It made me think about me and what programming skills I try to improve. I came to realize that there should be a difference in the programming skills you try to improve as developer and the programming skills you should improve as a team leader or project manager. My question is: What are the most important programming skills you need to improve as a team Leader or project manager? What would you recommend to others that want to improve?

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• How an LED-lit LCD Monitor Works [Video]

  - by Jason Fitzpatrick

  There’s a good chance you’re staring at one right now, the common LCD monitor. How exactly does it work? Find out by watching this informative video. Bill Hammack, the engineer behind the Engineer Guy video series, takes apart an LCD monitor and gives a detailed analysis of what’s going on inside as he rebuilds it–including how the pixels function, what the screen is constructed off, and how the light is diffused. LCD Monitor Teardown [YouTube via Hack A Day] HTG Explains: What’s the Difference Between the Windows 7 HomeGroups and XP-style Networking?Internet Explorer 9 Released: Here’s What You Need To KnowHTG Explains: How Does Email Work?

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• Using "prevent execution of method" flags

  - by tpaksu

  First of all I want to point out my concern with some pseudocode (I think you'll understand better) Assume you have a global debug flag, or class variable named "debug", class a : var debug = FALSE and you use it to enable debug methods. There are two types of usage it as I know: first in a method : method a : if debug then call method b; method b : second in the method itself: method a : call method b; method b : if not debug exit And I want to know, is there any File IO or stack pointer wise difference between these two approaches. Which usage is better, safer and why?

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• NoSQL : JSON, indexation distribuée et géoréplication débarquent dans Couchbase, le concurrent de MongoDB

  Base de données NoSQL : documents JSON, indexation distribuée et géoréplication débarquent dans Couchbase Le concurrent de MongoDB Couchbase Server, le système de gestion de bases de données NoSQL, vient de subir une mise à jour assez importante. La version 2.0 de Couchbase introduit un modèle de stockage de documents et un magasin clé-valeur (key-value), permettant à l'outil de faire un grand pas dans le support du Big Data (gros volumes de données). Pour rappel, CouchBase est un projet initialement basé sur le système noSQL Apache CouchDB, à la différence que le code Erlang de CouchDB a été entièrement réécrit en C++, avec des ajustements et ajouts en tirant profit du système de ...

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