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• White screen between Canvases

  - by user315647

  Hello everyone, I am having, what i believe is a minor issue. I am developing a J2ME application which predominantly uses canvases for display. The problem is I have set all these canvases to fullscreen and when i navigate from one class to another i am first given a white screen and then taken to the canvas i intend to go. I am not understanding what i am doing wrong I am using the following statement for navigation javax.microedition.lcdui.Display.getDisplay(MIDlet).setCurrent(Canvas); Please help!!

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• Which is a strongly typed language: Python or Prolog?

  - by User1

  I am new to Python and prolog. From my understanding, Python is a strongly typed language. Is Prolog a strongly typed language also?

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• Example usage of AX in PHP OpenID

  - by Supercharged

  I'm using JanRain's PHP OpenID library. It comes with example script which is using SReg extension. But I want it to work with Google (and it works for auth actually), but Google uses AX (attribute exchange) instead of SReg for additional data. For some reason, JanRain's library is missing AX support in example script, and code comments in AX script are out of my understanding, though comments in SReg script are clear as 1-2-3. Does anyone know how to implement AX without too much pain?

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• Capistrano, Mercurial and branches

  - by J. Pablo Fernández

  It is my understanding that although Mercurial has support from branches, the community generally clone repos instead of creating branches. Similar to the Darcs model, unlike the Git model. I'm deploying a Ruby on Rails app with Capistrano and there I'd like to separate the production from the development branch. Should I point Capistrano to a different repo or should I use branches?

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• What's an example of duck typing in Java?

  - by Cuga

  I just recently heard of duck typing and I read the Wikipedia article about it, but I'm having a hard time translating the examples into Java, which would really help my understanding. Would anyone be able to give a clear example of duck typing in Java and how I might possibly use it?

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• L2E for insert, update, delete

  - by 5YrsLaterDBA

  I am using .Net3.5. Just wondering my understanding about the insert, update, delete are correct when use L2E. For insert, we need two statements: context.AddObject("entityName", newRow); context.SaveChanges(); For update, we only need one statement: context.SaveChanges(); For delete, we need two statements: context.DeleteObject(deletedRow); context.SaveChanges();

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• Multiple Columns as Primary keys

  - by rockbala

  CREATE TABLE Persons ( P_Id int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255), CONSTRAINT pk_PersonID PRIMARY KEY (P_Id,LastName) ) The above example is taken from w3schools. From the above example, my understanding is that both P_Id, LastName together represents a Primary Key for the table Persons, correct ? Another question is why would some one want to use multiple columns as Primary keys instead of a single column ? How many such columns can be used in together as Primary key in a given table ? Thanks Balaji S

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• Looking for a good book on microprocessor internals

  - by David Holm

  I'm looking for a good book on how modern microprocessors are designed and work as I would like to increase my understanding of what makes them tick. Something that covers pipelines, superscalar architectures, caches etc. A book that is suitable for a programmer with several years of experience and has done and understands assembly programming and machine language, so basically not "CPUs for Dummies" or anything such. What books do people who design today's processors read for instance?

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• Query on Booleans in Lambda Calculus

  - by darkie15

  Hi All, I have following query on lambda calculus which am not able to understand: Here is the lambda calculus representation for the AND operator: lambda(m).lambda(n).lambda (a).lambda (b). m(n a b) b Can anyone help me in understanding this representation? Regards, darkie

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• Can someone clarify what this Joel On Software quote means?

  - by Bob

  I was reading Joel On Software today and ran across this quote: Without understanding functional programming, you can't invent MapReduce, the algorithm that makes Google so massively scalable. The terms Map and Reduce come from Lisp and functional programming. MapReduce is, in retrospect, obvious to anyone who remembers from their 6.001-equivalent programming class that purely functional programs have no side effects and are thus trivially parallelizable. What does he mean when he says functional programs have no side effects? And how does this make parallelizing trivial?

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• Do you guys know of any good File based caching for PHP?

  - by Scott Faisal

  The data to be cached is going to be HTML files and are to be retained anywhere from 3 days to a week. My understanding is that memcached would not be a good solution here since if the server goes down, we lose everything. Thank You

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• How to create a Turing machine that takes a single digit decimal number from 0 - 9 and output the cu

  - by Julian

  I'm working on a project for a Turning machine but having problems conceptualizing the steps. f(x) = x^3, where x is a single digit between 0 - 9 inclusive. Based on my understanding I am to convert the number to binary but how do I find the cube of a number in binary. Also, how do I write the cube on the tape. So far I'm thinking I should create a state diagram that accepts the binary versions of 0-9 but what next?

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• SPRING: What is AOP, Dependency Injection and Inversion Of Control in Simple English

  - by Rachel

  I have tried to understand AOP, Dependency Injection and Inversion of Control SPRING related concepts but I am having hard time understanding it. Can anyone explain this in simple English ?

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• Modulo operator in Objective-C returns the wrong result

  - by Greg Maletic

  I'm a little freaked out by the results I'm getting when I do modulo arithmetic in Objective-C. -1 % 3 is coming out to be -1, which isn't the right answer: according to my understanding, it should be 2. -2 % 3 is coming out to -2, which also isn't right: it should be 1. Is there another method I should be using besides the % operator to get the correct result?

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• What techinical skills should a programmer have?

  - by Samuel Carrijo

  Besides "non-technical" skills, like communication and teamwork, what are skills programmer should work on having? From the top of my head, I thought understanding math and concurrency. What are other necessary/recommended skills for a programmer?

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• COM IUnknown and do I need a pointer to it first before calling CoGetClassObject?

  - by Tony

  In COM, when you want to create an instance of some COM Server object, do you first need to get a pointer to it's IUnknown interface and only then create a class object using CoGetClassObject? As far as I understand it, IUnknown is used to manage object lifetimes, so from my understanding, whatever object the client wants to create, one needs a pointer to it's IUnknown interface implementation first. Sound correct? If not, can anyone tell me how it works?

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• Getting Response.End() behavior in JSP

  - by Sam Ingrassia

  Thanks to everyone in advance - I am aware of closing the jspwriter/outputstream and returning as a method to stop further execution in the main context. Has anyone found a way to stop execution outside of the main context? From my understanding of how jsp is 'compiled' etc I do not think this is possible, but I thought I should see if anyone has any clever solutions - Thanks, Sam

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• Example of an ASP.NET MVC post model?

  - by Anthony Potts

  I was watching the HaHaa presentation on ASP.NET MVC from MIX and they mentioned using a Post Model where I guess they were saying you could use a model that was ONLY for posting. I have tried looking for examples for this. Am I not understanding what they are saying? Does anyone have an example of how this might work in a strongly typed view where the view model and post model are not of the same type?

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• Network Security [closed]

  - by kapilg

  I have been a .net developer for the past three yrs. Just curious to know about the network security field. What kind of work does the developers working in these area do? I really have not much idea about network security but what my understanding is these people are involved in securing network, preventing attacks on network as obvious. Could any one please give me some details about this field and also what does it take to move to this field.

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• another porter stemming algorithm implementation question ?

  - by mike

  Hi, I am trying to implement porter stemming algorithm, but i am having difficualties understanding this point Step 1c (*v*) Y -> I happy -> happi sky -> sky Isn't that the the opposite of what we want to do , why does the algorithim convert the Y into I. for the complete algorithm here http://tartarus.org/~martin/PorterStemmer/def.txt Thanks

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• Difference between scrollViewDidEndScrollingAnimation and scrollViewDidEndDecelerating

  - by Michael

  and scrollViewDidScroll... In terms of view movement/animation and user experience. My understanding is that both fired at the end of bouncing scroll animation.

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• JPA/EJB3 Relationship

  - by sdoca

  I have been reading about JPA and EJB3 and would like to confirm that my understanding of their relationship is correct. Here's what I think I know... JPA is a specification that has been implemented by a number of vendors including: JBoss/Hibernate Oracle/TopLink Essentials (now EclipseLink) Apache/OpenJPA EJB3 is a specification that is implemented in Application Servers including: Glassfish JBoss Is this correct?

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• Legal to decompile an SWF licensed under Apache 2.0

  - by PeterG

  Is it legal to decompile an SWF that is licensed under Apache 2.0 with no additional terms? I'm also planning on modifying and using for commercial purposes. My understanding is that Apache License 2.0 allows for modification of source and object, but I'm not sure if I can convert from object to source. Thanks.

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• What is WCF (and pros and cons)?

  - by user279521

  I am trying to understand what is WCF, but can't get a visual understanding of how it adds value (reading msdn does'nt help). I have worked with COM in the past, and I know about webservices. Can someone shed some light on what is WCF and its pros and cons (maybe how it relates to COM or replaces COM etc)? Links to reference web sites would also be great. Thanks

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• NSFileCoordinator correct usage

  - by Johannes

  when writing a file using NSFileCoordinator i need to specify to correct NSFileCoordinatorWritingOptions. Although they are explained in detail, i am not sure when to use which one. The available options are: NSFileCoordinatorWritingForDeleting NSFileCoordinatorWritingForReplacing NSFileCoordinatorWritingForMoving NSFileCoordinatorWritingForMerging For example, what option is the correct one if i want to create a file(a plist for example)? Wich one when i modify a file? Can someone explain the NSFileCoordinatorWritingOptions for a better understanding? Greetings, Johannes

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