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  • How to verify the Liskov substitution principle in an inheritance hierarchy?

    - by Songo
    Inspired by this answer: Liskov Substitution Principle requires that Preconditions cannot be strengthened in a subtype. Postconditions cannot be weakened in a subtype. Invariants of the supertype must be preserved in a subtype. History constraint (the "history rule"). Objects are regarded as being modifiable only through their methods (encapsulation). Since subtypes may introduce methods that are not present in the supertype, the introduction of these methods may allow state changes in the subtype that are not permissible in the supertype. The history constraint prohibits this. I was hoping if someone would post a class hierarchy that violates these 4 points and how to solve them accordingly. I'm looking for an elaborate explanation for educational purposes on how to identify each of the 4 points in the hierarchy and the best way to fix it. Note: I was hoping to post a code sample for people to work on, but the question itself is about how to identify the faulty hierarchies :)

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  • Google won't display site

    - by Markasoftware
    My website (markasoftware.getenjoyment.net) doesn't seem to be indexed properly by Google (I haven't tried other search engines). When I type in the URL of my site it appears right at the top of the list like it should. When I type in the entire contents of the title, however, the site doesn't appear! The title is quite long (Thermonuclear War Game Online: Thermonuclear War By Mark) and it has little (if any) competition. Have I been punished by Google for some reason, or is it something else? I have received zero hits from search engines. Can someone tell me why my site down't appear?

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  • Can aynone tell me what exactly 32bit/64bit and x86 and AMD64 have to do with the different choices on the download site of Ubuntu?

    - by Elysium
    SORRY for the newbie question, but I am still learning. I am wondering if x86 simply refers to the intel CPUs and AMD64 simply refers to the AMD CPUs? While....32bit and 64bit to the processor types? I was trying to download the intel 64bit version of the Ubuntu installer, but it wont give the option of x86 and AMD64....only the 32bit and 64bit can be chosen. Does this mean that someone with an Intel CPU and another person with an AMD CPU will download the same install file? (obviously depending on the bit version of their CPUs this might differ....but that's another thing).

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  • access denied when trying to open terminal on desktop

    - by chris
    ok so heres the skinny. I just moved some file using the sudo su command so i can move them to bin folder in file system then after closing terminal tried to reopen from desktop and got permission denied. I then rebooted and now i cant access my account and when trying to login it starts to boot then back to login screen. I then boot up in xterm and i get this message bash: /home/chris/.bashrc:Permission denied. I'm currently running xubuntu 10.04 and would like to get back in to that user. Can someone please help me. Not a noob but close to it. Thanks to anyone who helps and the quicker the better.

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  • Thunderbird cant open due to GLiB Error

    - by Elli
    i recently updated Lubuntu to 13.10 and now after some days Thunderbird stopped working. It just won't open. When i try to open it with the terminal i get the following text: user@user-rechner:~$ thunderbird (process:6231): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed (thunderbird:6231): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::sm-connect after class was initialised (thunderbird:6231): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::show-crash-dialog after class was initialised (thunderbird:6231): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::display after class was initialised (thunderbird:6231): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::default-icon after class was initialised GNOME-Tastaturkürzel-Verzeichnis »/home/user/.gnome2/accels« konnte nicht angelegt werden: Keine Berechtigung (Translation: gnome shortcut-directory could not be created - no permission) Now i reinstalled it once, deleted this .thunderbird folder in my home directory and it still won't work. I hope someone can help me. Thanks.

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  • portfolio building, working for closed-source vs open-source?

    - by jondavidjohn
    I've currently graduated from my first run at higher education, landed my first full-time gig as a web application developer, and absolutely love it. My question is that in looking for jobs I ran across many jobs that require a certain level of experience and code examples. Much of the work I am doing is both protected by a login, and closed source. How does someone, that is just starting out and needs to be building a resume, go about preparing for the next job. (no matter how much i love my current job, i feel like it's only responsible to always be preparing)

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  • Reasons for Pair Programming

    - by Jeff Langemeier
    I've worked in a few shops where management has passed the idea of pair programming either to me or another manager/developer, and I can't get behind it at all. From a developer stand-point I can't find a reason why moving to this coding style would be beneficial, nor as a manager of a small team have I seen any benefit. I understand that it helps on basic syntax errors and can be helpful if you need to hash something out, but managers that are out of the programming loop seem to keep seeing it as a way of keeping their designers from going to Facebook or Reddit than as a design tool. As someone close to the development floor that apparently can't quite understand from a book tossed my way or a wiki page on the subject... from a high level management position, what are the benefits of Pair Programming when dealing with Scrum or Agile environments?

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  • How do I create and link to a database in ASP.NET (Razor) with Visual studio 2013?

    - by Blake
    We have a simple web app, part of which allows users to create accounts and then, hopefully soon, to write blog posts. The user log in system is working great, it utilizes the given .sdf database created when a new project is created. We would like to expand it now to allow for blog data (the title, body of the blog, image posts perhaps, etc). However, I'm unsure of how to add another table to the user database for this purpose - or if that would even be best since it has sensitive information in it. I've been reading blog post after blog post and still can't find anything current on this. All of the articles are for MVC projects or older versions of VS. If someone could point me in the right direction it would be greatly appreciated!

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  • How can I refactor a code base while others rapidly commit to it?

    - by Incognito
    I'm on a private project that eventually will become open source. We have a few team members, talented enough with the technologies to build apps, but not dedicated developers who can write clean/beautiful and most importantly long-term maintainable code. I've set out to refactor the code base, but it's a bit unwieldy as someone in the team out in another country I'm not in regular contact with could be updating this totally separate thing. I know one solution is to communicate rapidly or adopt better PM practices, but we're just not that big yet. I just want to clean up the code and merge nicely into what he has updated. Would a branch be a suitable plan? A best-effort-merge? Something else?

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  • Creating a 2D Line Branch (Part 2)

    - by Danran
    Yesterday i asked this question on how to create a 2D line branch; Creating a 2D Line Branch And thanks to the answered provided, i now have this nice looking main branch; *coloured to show the different segments in the final item. Now is the time now to branch things off as discussed in the article; http://drilian.com/2009/02/25/lightning-bolts/ Again however i am confused as to the meaning of the following pseudo code; splitEnd = Rotate(direction, randomSmallAngle)*lengthScale + midPoint; I'm unsure how to actually rotate this correctly. In all honesty i'm abit unsure what to-do completely at this part, "splitEnd" will be a Vector3, so whatever happens in the rotate function must then return some form of directional rotation which is then * by a scale to create length and then added to the midPoint. I'm not sure. If someone could explain what i'm meant to be doing in this part that would be really grateful.

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  • Upload ICS (calandar) file to my server

    - by IEnumerable
    I want to upload my ICS file to my server, well this is the easy part. What I really want is to be able to share this *.ics file with 2-3 people so they can edit. I have currently uploaded the file on the www/ (root) mydomain.com.au/myfile.ics of my server and added it to my Email/Cal client. Was all looking ok until I tried to save changes. Can someone please direct me to some documentation on how I do this properly. The easy solution would be to upload to google, but I would rather learn how to manage the file myself. Thank you

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  • How to I teach my artist to do arts for games?

    - by Holm76
    So my girlfriend is an artist and I'm a programmer and we often talk about joining talents and doing some small games or other fun stuff for the different popular platforms currently out. But because I haven't really done any serious games development yet I have a hard time explaining to her how she should create or package the assets she'd make so we always end up not doing nothing about it. What I'm mostly thinking about here is when doing frame by frame animation. I know sprite sheets are used for this kind of thing but then comes questions like frames per second and stuff like like that. Not program wise but art wise. Is there a reference site or sites out there that teach someone with the skills of art how to manage and arrange the assets in sprite sheets and other stuff in words that artists understand?

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  • I Don't Understand Anything About Randomly Generated Worlds [closed]

    - by Alex Larsen
    What tools do I need to make a Minecraft-like generated world? I heard about Perlin noise and Simplex, but I don't understand anything about them. So far all I found on the internet was a Simplex version for C#, and all it has is functions, and this is what I get: Console.WriteLine(Noise.Generate(SomeNumber, SomeNumber, SumNumber)); Outputs random floats. I'm really lost. I don't understand the whole random generated worlds concept. Can someone help me? And if I use the noise thing I don't understand how to use it.

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  • I can't even login, black screen! [SOLVED]

    - by Elisa Velasco Lorenzo
    I wanted to fix something, and I followed the advice given by someone on the #ubuntu IRC chat. I don't think I did it properly, because now, I cannot even login and I have a black screen. Ii must be a Gdm / Lightdm issue... I am writing this from another computer. Is there a way I can solve this without formatting and losing all my files? All I have is the GRUB menu. I don't even have the recovery mode on the GRUB menu...

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  • How should I pronounce the :: and -> in PHP?

    - by NickC
    When I read these lines aloud to someone: $controller->process(); UserManager::getInstance(); How should the -> and :: be pronounced? Reading the characters themselves in cumbersome and I don't know of any nicknames for them. Being a developer who is used to C-style syntax, I'd like to say "dot", but I'd like something that is easy to say and people can easily understand. It would also be good to know if there are any pronunciations that have become de-facto standards among teams of developers.

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  • Opensource package for securly allowing users to log in and provide information

    - by JTS
    I have a site written in mostly php and html. I also have a sql database of personal information like names and addresses. I would like my users to be able to log in to my website with a login I can email or snail mail to them, and view and edit their information on my database. Users can currently enter information online I and store it in my database but they can't view or edit stored information. I can add the code to do this, but when I give users the ability to view information I suddenly have a lot more security concerns. Is there an open source package to deal with allowing users to do something like this? Or is there an established convention for this? I know this is a pretty basic question, and there might be some good literature about it that I have yet to find, so if someone can just point me in the direction of some of that information, or better yet give me firsthand some information about this that would be great.

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  • Web Development Internship Interview Help

    - by Todd
    Tomorrow morning I'm interviewing for a web development internship position and I'm seeking general advice pertaining to the questions that interviewers might ask, some questions I should ask them during the interview, and any general tips/suggestions that might help. They're looking for someone with knowledge mainly in HTML/CSS, Joomla, MySQL and PHP, all of which I have excluding Joomla (which I'm installing/doing as much research on as possible at the moment) and I was able to provide them a link to a site I'd been paid to build for a small business which they mentioned they were impressed with. I'd like to prepare myself for the interview as much as I possibly can but I'm wondering how much time I should spend rehashing elements of the languages they're looking for, or if it'd be a better use of my time to research their company and figure out how I'd respond to general questions. I feel that perhaps because I showed them a project I've completed that they'll know that I can grasp the technical side of what they're going for... but this is my first internship interview in this field so I'm not exactly sure what to expect. Thanks

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  • How to create email request forms and auto-responder?

    - by mfc
    I'm building a site in css and I'm pretty new to any code or script other than html and css. I'm trying to create a landing page that requires an email from visitors and set up an auto responder to send to that newly submitted email. This would also be a signup for email newsletters. I have some idea how to create the form and have looked into a bit. I don't know how to make it a requirement to get past the landing page and into the actual website or set up the auto-responder. Any help would be much appreciated. Or if someone knows of a source that explains how to do this thing in particular it would be wonderful. I tried lynda.com but everything is so general and I can't seem to find info on exactly how to do this but I know its quite common. Thanks!

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  • Logitech K260 keyboard responds very, very slow

    - by Pierre
    I bought a Logitech K260 wireless keyboard/mouse combination and connected it to my Ubuntu 12.04 workstation. The mouse seems to work fine for now, it is quick and is working quite smoothly. The keyboard however is very, very slow. It takes about two to three seconds for a character to appear after being typed. What might be the problem? I have found even a review of someone who states that he's gaming with this keyboard, which I am not planning to do, for me it will serve as a writing keyboard only as soon as it works properly. Who might be able to help?

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  • brother MFC-J435W wireless scanning issue

    - by ogreen32
    Thanks for taking the time to read this. I have a brother MFC-J435W and I was able to get the printer set up for wireless printing, but it is not allowing me to scan wirelessly. It gives me the message to "check connection". I'll tell you what I've done so far and maybe someone can help me out. I've installed the scanner driver and scan tool I installed Xsane (to see if it would allow the scanner to communicate with the computer and that didn't help). I've tried restarting the computer. After those things I am now at a loss as to where to go from here. Any help would be great. Thanks. I've also searched for this question in the Brother FAQ as well as on here and I haven't found an answer. Thanks again.

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  • Debugging OpenOffice crashes

    - by JD Long
    This is partly an OpenOffice question and partly a Ubuntu question. I'm running OpenOffice 3.2.0 and Ubuntu 10.04. I get frequent crashes of OO, especially the Calc app, although I get crashes in the word processor as well. They are very abrupt and accompanies by no warning or error message. I'm just typing away and then the app is gone. Sometimes I even end up thinking I'm typing in OO and discover that OO has crashed and I'm typing in whatever application was under OO. However, I can't reproduce these crashes on demand. They seem random. I can open the same file and do the same exact thing but it does not crash. In Ubuntu how do I trace, track, or diagnose these types of crashes? Is there software I can invoke to help diagnose? Can I start OO from a command prompt with debugging of some sort enabled? Note: if someone could add the tag OpenOffice, I would appreciate it

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  • Real World ADF - another new ADF book hits the stands

    - by Grant Ronald
    I'm pleased to report that yet another Oracle ADF book hits the bookstores this month.  One of my fellow Product Managers, Jobinesh, has written Oracle ADF Real World Developer's Guide.   I'm currently awaiting a copy for review and can't wait to get into this book.  Jobinesh is an incredibly smart and switched-on technical ADF guru and I'm convinced I'm going to learn a whole lot of tips and techniques from this book. Once I get my hands on a copy I'll be writing up a full review. As someone who has written an Oracle ADF book already, I know the effort that goes into something like that, so well done Jobinesh.

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  • Avatar creation / dressing feature

    - by milesmeow
    What is the effort required to use a game engine such as Unreal or Unity, etc. and create an avatar customization features...complete with clothes. The user should be able to customize the body features and the clothes need to then fit onto the customized body. What is needed? Can you create one set of 3D models for clothes and somehow programatically have the clothes adapt to the body shape? I.e. The same shirt model will be able to fit on a skinny person vs. someone with a big beer belly. How difficult is this? What are the steps needed to implement this avatar creation/dressing feature. I'm basically talking about something like in Rockband 3.

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  • Avoiding lag when rendering Texture2D for first time

    - by Emir Lima
    I have found a similar question here, but it is about playing sounds. I am using 2048 x 2048 textures for sprite sheets and every time I call spriteBatch.Draw using a sheet for the first time in game execution, causes a considerable lag. The lag doesn't appears for the next times. Someone has faced this problem before? What can I do to overcome this? Update: I inserted a code in the end of content load routine that draws EVERY Texture2D that is loaded into ContentManager before follow to the game screen. This works well. None lag occurs when different textures are rendered over the time, EXCEPT if the IsFullScreen are changed. Apparently, changing this property makes the textures loaded in the GPU gone. Is that correct?

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  • How do you install less css command line compiler?

    - by chrisjlee
    From my understanding and correct me if I'm wrong, I have to get ruby or NPM installed to get the less css compiler working. I don't have any ruby installed and I'm not really sure how to get my computer to that point. I also want to minimize my footprint; installing the minimal amount of ruby libraries if possible (because i will never use ruby except for when i run less). What are the steps involved in getting less working and running? Before you down vote, I know there was this previous thread (Less CCS compiler install). This particular person already has some other packages installed. I'm trying to figure out all the packages needed to get to that point. Or if someone could point me to the right documentation I would be thrilled!

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