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• Why does this code sometimes throw a NullPointerException?

  - by Tiberiu Hajas

  Consider the following Java source: if( agents != null ) { for( Iterator iter = agents.keySet().iterator(); iter.hasNext(); ) { // Code that uses iter.next() ... // } } The agents is a HashMap. Why does the for statement sometimes throw a NullPointerException? Thank you.

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• Why must I make a protocol like this?

  - by mystify

  @protocol SomeDelegate<NSObject> //stuff... @end Why the <NSObject> part? Couldn't I just do @protocol SomeDelegate //stuff... @end ?

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• Why are filename underscores better than hyphens

  - by Jasie

  From Building Skills in Python: "A file name like exercise_1.py is better than the name execise-1.py. We can run both programs equally well from the command line, but the name with the hyphen limits our ability to write larger and more sophisticated programs." Why?

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• Why -use-network=false

  - by dejaninic

  Hi guys. Dose anyone knows why I have to use -use-network=false in my Flex Builder?!?!?! This is set inside the Project Properties and is Additional compiler argument. This is only when I want to read in a external file like XML. Others in my team doesn't have to have -use-network=false ????

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• Why the generated key size is not constant?

  - by Tom Brito

  The following code prints randomly 634, 635, 636, each time I run it. Why its not constant? public static void main(String[] args) throws Exception { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA", "BC"); keyPairGen.initialize(1024); RsaKeyPair keyPair = new RsaKeyPair(keyPairGen.generateKeyPair()); System.out.println(keyPair.getPrivate().getEncoded().length); }

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• Why use Hibernate/nHibernate?

  - by ProgrammingPope

  I have found myself doing a lot of work to get nHibernate setup and am left wondering: Why use a framework like Hibernate/NHibernate? I am sure that quite a few people love the framework but I am unclear on the advantages and disadvantages. What are the advantages and disadvantages of lazy loading, and are there other features to Hibernate? Is there anything that makes a framework like this easier to use (best practices, other frameworks, etc)?

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• Why do people run Java GUI's on the Event Queue

  - by asmo

  In Java, to create and show a new JFrame, I simply do this: public static void main(String[] args) { new JFrame().setVisible(true); } However, I have seen many people doing it like this: public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { new JFrame().setVisible(true); } }); } Why? Are there any advantages?

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• why tempspace results here??

  - by SubPortal

  if we supposed that "A.B." is a value for an xml element called given-names the following code converts this value to "A.tempspacetempspaceB." instead of "A. B." foreach (XElement initial in doc.XPathSelectElements("//given-names")) { string v = initial.Value.Replace(".", ". ").TrimEnd(' '); initial.SetValue(v); } So why tempspace comes here instead of literal space?? thank you for any help.

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• Why getResourceAsStream method is in Class class?

  - by anupsth

  Why public InputStream getResourceAsStream(String name) is in Class class? It just give inputstream of file which is in jar file and there is no relation with Class class. so it can be static method and it can be in any class.

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• Why is there no middleware in Erlang?

  - by Zubair

  I asked a question earlier about ESBs written in Erlang or Java, and there didn't seem to be anything in Erlang, and only products in Java. http://stackoverflow.com/questions/2453641/what-would-be-the-best-language-in-which-to-write-an-esb/2453683#2453683 I guess I find it difficult to understand why a language like Erlang has no such middleware products, especially seeing as it should be ideally suited to the job.

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• why is apache not clearing the semaphores?[Reasons]

  - by mike

  Could some shed some light on why apache semaphore are left over? Might be bcoz of Buggy php module/Defective RAM? Thanks.

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• Why isn't there a regular expression standard?

  - by weiy

  I know there is the perl regex that is sort of a minor de facto standard, but why hasn't anyone come up with a universal set of standard symbols, syntax and behaviors?

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• C++ Why isn't call by reference needed for strcpy()

  - by Ribbs

  I have a homework assignment with a number of questions. One is asking why the strcpy() function doesn't need the call by reference operator for CStrings. I've looked through the book numerous times and I can't, for the life of me, find the answer. Can anyone help explain this to me? It is an array of sorts so I would think you would need the call by reference.

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• Why is T() = T() allowed in C++?

  - by Rimo

  I believe the expression T() creates an rvalue (by the Standard) However the following code compiles (at least on gcc4.0) class T {... }; int main() { T() = T(); } I know technically this is possible because member functions can be invoked on temporaries and the above is just invoking the operator= on the r-value temporary created from T(). But conceptually this is like assigning a new value to an r-value. Is there a good reason why this is allowed?

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• Why to use static method with Json ?

  - by Zerotoinfinite

  Hi Experts, I am clueless to find out why should we use static method with JSON. Is it possible that I click a button and I load a gridview with JSON ?? Thanks in advance

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• Why do we need break after case statements?

  - by kunjaan

  Why doesn't the compiler automatically put break statements after each code block in the switch? Is it for historical reasons? When would you want multiple code blocks to execute?

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• Why abstract classes necessary?

  - by bala3569

  1.What is the point of creating a class that can't be instantiated? Most commonly to serve as a base-class or interface (some languages have a separate interface construct, some don't) - it doesn't know the implementation (that is to be provided by the subclasses / implementing classes) 2.Why would anybody want such a class? For abstraction and re-use 3.What is the situation in which abstract classes become NECESSARY?can anyone brief it with an example?

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• Why doesn't Microsoft.SqlServer.Smo appear in the Add References dialog

  - by Sisiutl

  I have used Microsoft.SqlServer.Smo.dll and Microsoft.SqlServer.ConnectionInfo.dll in a number of VS2008 projects but they don't appear in the VS2010 Add Reference dialog. Why did they disappear and how can I add them to my VS2010 project?

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• Why is setscheduler not forcing need resched

  - by EpsilonVector

  I noticed that in Linux kernel 2.4 setscheduler doesn't force need_resched. Why is that? is it just some convention, or does that happens somewhere else?

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• Can Events be declared as Static, if yes how and why

  - by sameer

  Hi All, I want to know can we declare the events as static if yes why and application of such declaration. Sample please as seeing is believing

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• Why is CompareAndSwap instruction considered expensive?

  - by eyalw

  Why is CompareAndSwap instruction considered expensive? I read in a book: "Memory barriers are expensive, about as expensive as an atomic compareAndSet() instruction." Thanks!

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• Why is 0.2 + 0.7 not 0.9? [closed]

  - by jAndy

  Possible Duplicate: Is JavaScript’s math broken? Example: var result = 0.2 + 0.7; alert(result); In Javascript, the result is NOT as expected 0.9 Why?

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• Why use Visual Studio 6 for C++

  - by robUK

  Hello, I am just wondering why programmers who program in C++ for windows always use Visual Studio 6 instead of Visual Studio 2008? Isn't the compiler in 2008 much better than the one in VS6? The reason I ask as I have used many sdk's that are always written in VS6? Many thanks, Steve

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• Why is `goog.Disposable.call(this);` necessary?

  - by David Faux

  In this snippet of Google Closure javascript code involving a constructor, why is goog.Disposable.call(this); necessary? Doesn't Foo already inherit from Disposable with goog.inherits(foo, goog.Disposable);? goog.provide('foo'); /** * @constructor */ foo = function(){ goog.Disposable.call(this); } goog.inherits(foo, goog.Disposable); foo.prototype.doSomething = function(){ ... } foo.prototype.disposeInternal = function(){ ... }

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• why java Object class is not abstract ?

  - by JavaUser

  Hi, Why java's Object class is not an abstract class . Is there any specific reason ? Thx.

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