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  • Is Unit Testing important?

    - by PieterG
    I've recently been catching up on my podcasts and reading and found this article from Joel Spolsky. The Question that I for all of you is the following. Is Unit Testing Important? What do you test? Do you write unit tests on all your projects? I suppose this question is a bit more of a poll on unit test coverage.

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  • Is it good practice to use the XOR (^) operator in Java for boolean checks?

    - by Pete
    I personally like the 'exclusive or' operator when it makes sense in context of boolean checks because of its conciseness. I much prefer to write if (boolean1 ^ boolean2) { //do it } than if((boolean1 && !boolean2) || (boolean2 && !boolean1)) { //do it } but I often get confused looks (from other experienced java developers, not just the newbies), and sometimes comments about how it should only be used for bitwise operations. I'm curious as to the best practices others use around the '^' operator.

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  • Resources for writing kernel in C

    - by anon
    I don't want to write my own boot loader -- happy to use Grub. I just want to implement pre-emptive multi threading, a basic file system, and virtual memory. I want something that can run on top of qemu. What's a good resource (book / tutorial) for accomplishing this goal? Thanks!

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  • How do you unit test the real world?

    - by Kim Sun-wu
    I'm primarily a C++ coder, and thus far, have managed without really writing tests for all of my code. I've decided this is a Bad Idea(tm), after adding new features that subtly broke old features, or, depending on how you wish to look at it, introduced some new "features" of their own. But, unit testing seems to be an extremely brittle mechanism. You can test for something in "perfect" conditions, but you don't get to see how your code performs when stuff breaks. A for instance is a crawler, let's say it crawls a few specific sites, for data X. Do you simply save sample pages, test against those, and hope that the sites never change? This would work fine as regression tests, but, what sort of tests would you write to constantly check those sites live and let you know when the application isn't doing it's job because the site changed something, that now causes your application to crash? Wouldn't you want your test suite to monitor the intent of the code? The above example is a bit contrived, and something I haven't run into (in case you haven't guessed). Let me pick something I have, though. How do you test an application will do its job in the face of a degraded network stack? That is, say you have a moderate amount of packet loss, for one reason or the other, and you have a function DoSomethingOverTheNetwork() which is supposed to degrade gracefully when the stack isn't performing as it's supposed to; but does it? The developer tests it personally by purposely setting up a gateway that drops packets to simulate a bad network when he first writes it. A few months later, someone checks in some code that modifies something subtly, so the degradation isn't detected in time, or, the application doesn't even recognize the degradation, this is never caught, because you can't run real world tests like this using unit tests, can you? Further, how about file corruption? Let's say you're storing a list of servers in a file, and the checksum looks okay, but the data isn't really. You want the code to handle that, you write some code that you think does that. How do you test that it does exactly that for the life of the application? Can you? Hence, brittleness. Unit tests seem to test the code only in perfect conditions(and this is promoted, with mock objects and such), not what they'll face in the wild. Don't get me wrong, I think unit tests are great, but a test suite composed only of them seems to be a smart way to introduce subtle bugs in your code while feeling overconfident about it's reliability. How do I address the above situations? If unit tests aren't the answer, what is? Thanks!

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  • need an alternative tool for DB visualiser..

    - by san6086
    Hi, I am having netessa db as the backend for my application.I need to write procedure so as to handle many complex logic but my db visualiser version doesnt support procedures. Please suggest me a tool instead of this db visualiser. A freeware would be preferable. Please suggest

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  • Backslash in JavaScript

    - by erasmus
    In my javascript code I have onchange="document.getElementById('user_name').value = document.getElementById('theDomain').value + '\\' + document.getElementById('fake_user_name').value" here backslash doesn't work. What is the problem? How should I write it?

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  • download file exception handling

    - by klaus-vlad
    Hi, In my application I download several critical files from a server, and I want to write some code that handles the case where the a file download didn't complete for a reason or other ,to retry downloading it at next startup. The function that downloads a file at a time however throws only MalformedURLException and IOException , but if these exceptions are thrown that means that the download didn't even begin. How should I arrange things so I can treat the case where a download failed , even if it began ? download(String file) throws MalformedURLException ,IOException { }

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  • How do I update a cumulative field in a Rails database (using ActiveRecord or Mongoid)?

    - by picardo
    I want to update a field in a database table that has to have a cumulative value. So basically I need to find the current value of the field and update it using a new number. My first inefficient try at this (in Mongoid) is: v = Landlord.where(:name=>"Lorem") v.update_attributes(:violations=>v.violations + 10) Is there a simple method than making one query to read, then sum up, and another query to write?

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  • DAO method retrieve single entry

    - by London
    Hello, How can I write DAO method which will return as a result only first entry from the database. For instance lets say I'm looking at Users table and I want to retrieve only the first entry, I'd declare method like: public User getFirstUser(){ //method logic } EDIT: User has primary key id if that matters at all. I apologize if this question is too simple/stupid/whatever I'm beginner with Java so I'm trying new things. thank you

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  • Linked lists in Java - help with assignment

    - by user368241
    Representation of a string in linked lists In every intersection in the list there will be 3 fields : The letter itself. The number of times it appears consecutively. A pointer to the next intersection in the list. The following class CharNode represents a intersection in the list : public class CharNode { private char _data; private int _value; private charNode _next; public CharNode (char c, int val, charNode n) { _data = c; _value = val; _next = n; } public charNode getNext() { return _next; } public void setNext (charNode node) { _next = node; } public int getValue() { return _value; } public void setValue (int v) { value = v; } public char getData() { return _data; } public void setData (char c) { _data = c; } } The class StringList represents the whole list : public class StringList { private charNode _head; public StringList() { _head = null; } public StringList (CharNode node) { _head = node; } } Add methods to the class StringList according to the details : (I will add methods gradually according to my specific questions) (Pay attention, these are methods from the class String and we want to fulfill them by the representation of a string by a list as explained above) public int indexOf (int ch) - returns the index in the string it is operated on of the first appeareance of the char "ch". If the char "ch" doesn't appear in the string, returns -1. If the value of fromIndex isn't in the range, returns -1. Pay attention to all the possible error cases. Write what is the time complexity and space complexity of every method that you wrote. Make sure the methods you wrote are effective. It is NOT allowed to use ready classes of Java. It is NOT allowed to move to string and use string operations. Here is my try to write the method indexOf (int ch). Kindly assist me with fixing the bugs so I can move on. public int indexOf (int ch) { int count = 0; charNode pose = _head; if (pose == null ) { return -1; } for (pose = _head; pose!=null && pose.getNext()!='ch'; pose = pose.getNext()) { count++; } if (pose!=null) return count; else return -1; }

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  • Windows XP GUI programming language

    - by bobir
    I need to write a Windows XP/Vista application, main requirements: Just one .exe file, without extra runtime, like Air, .Net; posstibly a couple of dlls. Very small file size. The application is for network centric usage, similar to ICQ or Gtalk clients. Thanks in advance.

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  • how to detect javascript features on Android 1.5

    - by Sirber
    I'm trying to write a code that can run on Android 1.5 and 2.0.1, but I have issues with the javascript engine used on Android 1.5. alert(localStorage); just hang on v1.5 while on v2.0.1 it alerts correctly. is there an unblocking way to do it or to detect the version of Android with javascript?

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  • System.Web.UI not available in console app?

    - by Walter
    Hey everybody, Im trying to write a quick console app that outputs data to an HTML file, however im having trouble accessing the System.Web.UI namespace. Adding System.Web to my references places a warning icon on top of the reference name in the solution explorer and System.Web is not available in the .NET reference list (in order for me to actually add it to the project I have to go to the object browser and add it from there). Anybody have any ideas about what I could be missing? Thanks alot people!

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  • One-liner javascript to collect values from object graph?

    - by Kevin Pauli
    Given the following object graph: { "children": [ { "child": { "pets": [ { "pet": { "name": "fido" } }, { "pet": { "name": "fluffy" } } ] } }, { "child": { "pets": [ { "pet": { "name": "spike" } } ] } } ] } What would be a nice one-liner (or two) to collect the names of my grandchildren's pets? The result should be ["fido", "fluffy", "spike"] I don't want to write custom methods for this... I'm looking for something like the way jQuery works in selecting dom nodes, where you can just give it a CSS-like path and it collects them up for you. I would expect the expression path to look something like "children child pets pet name"

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  • Creating content input form with custom theme (Drupal)

    - by AndrewSmith
    I'm creating a site which I want to place content input form in custom themed template. I opted to do this because I wanted the whole site to be looked uniform. That said, I'm not sure as to what is the best approach to do this. Is it proper to invoke hook_insert/delete/update and hook_perm/hook_access by myself or is there anyway I can still use my custom theme and write a code in a way that drupal would take care of invoking appropriate hooks accordingly? Thanks in advance PS : I'm on drupal 6.x

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  • simple IDE in C,link my program to gcc

    - by Moein Hoseini Manesh
    hi my friends, I wanna to write simple C compiler,I wrote some parts of it it can check synetic of C,now I need to link my program to gcc how can I do it? I wanna to link it,for example when user open file in my programm,gcc compile it and save it where the user want. now I don't now how to say gcc to complie this file,show error and ... [english is not my mother language,and my english is not so well,so I apologize for any mistake in my post or If I can't reached my mean]

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  • C# and WCF + Getting the location of execution

    - by user208662
    Hello, I have a WCF service that is responsible for writing a log file. I would like to write a log file relative to the location of my WCF service. This service does NOT have an HttpContext available. Because of this, I cannot use HttpContext.Current.Server.MapPath. How can I get the location of where my WCF service is running so that I can create a log file? Thank you

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  • Annotations present at compile time but absent at runtime

    - by deamon
    It is possible to use Java class files which includes annotations that are not present at runtime? Example: I want to write a class with the JPA @Embeddable annotation, which would be present at compile time (maven scope: "provided"). But the annoatation definition could be absent at runtime, if the class is used outside a JPA application.

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  • Open source web cam conference software

    - by BasicallyBoredWithoutAnOffice
    Quick question, has anyone ever come across either a web cam API or an open source alternative that can be easily integrated to a site without having any Flash or ActionScript experience. I should probably say what I'm trying to do.... The idea is to create a Facebook app that lets friends communicate (and meet new people too) in real time over web cam. However I don't have the required experience to write the Flash part so any help would be appreciated.

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