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  • When would you prefer to declare an exception rather than handling it in Java?

    - by Epitaph
    I know we can declare the exception for our method if we want it to be handled by the calling method. This will even allow us to do stuff like write to the OutputStream without wrapping the code in try/catch block if the enclosing method throws IOException. My question is: Can anyone provide an instance where this is usually done where you'd like the super class to handle the exception instead of the current method?

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  • GWT Table that supports dynamic filtering

    - by Holograham
    This question is similar to http://stackoverflow.com/questions/161686/gwt-table-that-supports-sorting-scrolling-and-filtering However I would prefer open source and I am looking for snappy performance. I want a good way to perform dynamic filtering on rows. SmartGWT's adaptive filter looks interesting. http://www.smartclient.com/smartgwt/showcase/#grid_adaptive_filter_featured_category Anyone have any experience with this?

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  • Create a Editable Grid View as in iBooks

    - by tilomitra
    There have been some similar questions asked regarding Grid views, but none have been sufficiently answered (some have been left unanswered as the SDKs were under NDAs at the time). The question is: Can anyone direct me towards a tutorial, or explain to me what steps to take to create a Grid View similar to iBooks, or the Yahoo! Entertainment app on the iPhone? Here's a screenshot of what I mean.

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  • Calling a generic function in VB.NET / C#

    - by Quandary
    Question: I want to call a generic function, defined as: Public Shared Function DeserializeFromXML(Of T)(Optional ByRef strFileNameAndPath As String = Nothing) As T Now when I call it, I wanted to do it with any of the variants below: Dim x As New XMLserialization.cConfiguration x = XMLserialization.XMLserializeLDAPconfig.DeserializeFromXML(Of x)() x = XMLserialization.XMLserializeLDAPconfig.DeserializeFromXML(GetType(x))() x = XMLserialization.XMLserializeLDAPconfig.DeserializeFromXML(Of GetType(x))() But it doesn't work. I find it very annoying and unreadable having to type x = XMLserialization.XMLserializeLDAPconfig.DeserializeFromXML(Of XMLserialization.cConfiguration)() Is there a way to call a generic function by getting the type from the instance ?

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  • Calculating permutations in F#

    - by Benjol
    Inspired by this question and answer, how do I create a generic permutations algorithm in F#? Google doesn't give any useful answers to this. EDIT: I provide my best answer below, but I suspect that Tomas's is better (certainly shorter!)

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  • ThreadPooler in Spring 2.5.6

    - by MiKu
    My application uses Spring 2.5.6. I have a service that creates explicit threads for some specific task. Triggering of this service call happens through quartz time scheduler. Question : While executing service calls, i want to use some sort of thread pooler that can return me thread instances. Is there any implementations that i can use in Spring?

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  • Delphi Path Variables

    - by user337340
    Hey Everyone, I've got what I'm hoping is a simple question. In the Delphi IDE, the path to the Delphi installation is specified as $(DELPHI). I am wondering if there is a way to create my own path indicators, such as $(MY_LIBRARY) or something similar. I thought $(DELPHI) was specified as an environment variable, but apparently not. Any ideas? Thanks all! ~DJ DJ Quimby

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  • How can a test script inform R CMD check that it should emit a custom message?

    - by mariotomo
    I'm writing a R package (delftfews) here at office. we are using svUnit for unit testing. our process for describing new functionality: we define new unit tests, initially marked as DEACTIVATED; one block of tests at a time we activate them and implement the function described by the tests. almost all the time we have a small amount of DEACTIVATED tests, relative to functions that might be dropped or will be implemented. my problem/question is: can I alter the doSvUnit.R so that R CMD check pkg emits a NOTE (i.e. a custom message "NOTE" instead of "OK") in case there are DEACTIVATED tests? as of now, we see only that the active tests don't give error: . . * checking for unstated dependencies in tests ... OK * checking tests ... Running ‘doSvUnit.R’ OK * checking PDF version of manual ... OK which is all right if all tests succeed, but less all right if there are skipped tests and definitely wrong if there are failing tests. In this case, I'd actually like to see a NOTE or a WARNING like the following: . . * checking for unstated dependencies in tests ... OK * checking tests ... Running ‘doSvUnit.R’ NOTE 6 test(s) were skipped. WARNING 1 test(s) are failing. * checking PDF version of manual ... OK As of now, we have to open the doSvUnit.Rout to check the real test results. I contacted two of the maintainers at r-forge and CRAN and they pointed me to the sources of R, in particular the testing.R script. if I understand it correctly, to answer this question we need patching the tools package: scripts in the tests directory are called using a system call, output (stdout and stderr) go to one single file, there are two possible outcomes: ok or not ok, so I opened a change request on R, proposing something like bit-coding the return status, bit-0 for ERROR (as it is now), bit-1 for WARNING, bit-2 for NOTE. with my modification, it would be easy producing this output: . . * checking for unstated dependencies in tests ... OK * checking tests ... Running ‘doSvUnit.R’ NOTE - please check doSvUnit.Rout. WARNING - please check doSvUnit.Rout. * checking PDF version of manual ... OK Brian Ripley replied "There are however several packages with properly written unit tests that do signal as required. Please do take this discussion elsewhere: R-bugs is not the place to ask questions." and closed the change request. anybody has hints?

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  • JFileChooser - multiple file filters?

    - by waitinforatrain
    Hi guys, I have a question about the JFileChooser in Swing. I'm trying to get multiple file extensions in the drop-down box, but have no idea how to do it. There is the method extFilter = FileNameExtensionFilter(description, extensions); that I can then use by writing fileChooser.setFileFilter(extFilter); however, as you can see, this only supports one option in the drop-down list. How do I add more?

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  • Anybody knows how to make the JSon suggest close on click?

    - by melaos
    hi guys, i'm using this json suggest box and i was wondering if there's a way to include an option to make it close when the user click on somewhere else? else right now unless the user select something, the suggest box will never close. Or is there another suggest box out there that i can use? basically my data are in json format. sorry if this question sounds lazy, but i think if there's other json suggest users, they might appreciate this too.

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  • Does Marshal.ReleaseComObject call the garbage collector ?

    - by Shimrod
    Hi, I was asked this question today by a colleague, and couldn't find any clue on the Internet... Can someone tell me if calling Marshall.ReleaseComObject()directly calls the garbage collector ? As I understand it, it only removes COM references, and then the G.C. cleans memory on its next pass, but I can be mistaken... Thanks in advance for your help!

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  • Childwindows in MVVM

    - by VexXtreme
    Hi I'm having a problem understanding something about MVVM. My application relies on dialogs for certain things. The question is, where should these childwindows originate from? According to MVVM, viewmodels should contain only businesslogic and have zero actual knowledge about UI. However, what other place should I call my childwindows from, considering they're UI elements? Doesn't this create tight coupling between elements?

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  • How to auto-remove trailing whitespace in Eclipse?

    - by Jan Zankowski
    Hello, The question has two parts, one of which I already have the answer for. How to auto-remove trailing whitespace from the entire file being edited? - Answer: use the AnyEdit plugin, which can be set to do that on any save to the file. How to auto-remove trailing whitespace only from the lines I changed? - This I don't know and would appreciate any help. Thanks, Jan

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  • What are guard methods/classes?

    - by Paul Sasik
    i just noticed the guard method/class mentioned in this question and i don't really get the concept from the answers. And alas, Jon Skeet's link to an MS site never loaded. A few quick Google searches seemed to yield only products, not software engineering concepts. Any explanation and/or samples would be appreciated. (Especially from the .Net side of things.)

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  • Creating a 64bit build in Visual studio

    - by user48408
    I have an old .net 2.0 windows app I need to deploy on a windows 7 machine and its not going too well. I want to build a native 64 bit version rather than a 32bit capable of running on a 64bit environment. I'm working with Visual studio 2005 My question is what settings do I need to set within each project of my solution, (both the windows app + my dll's that it references) and what settings i should set on my install project (I have a deployment project for distribution)

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  • array interleaving problem

    - by Matt
    I was looking for something over the web when I came across this question. Have no idea of how to solve it. Help me out please. Suppose we have an array a1,a2,... ,an, b1,b2,..., bn How to change this array to a1,b1,a2,b2, ..., an,bn in O(n) time and in O(1) space.

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  • Valid Charset for CSS

    - by Alix Axel
    Quick question: what is the (full) valid / allowed charset for id and class CSS identifiers? Is there a regular expression that I can use to validate against? Is it browser agnostic?

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  • Grep / RegExp help

    - by Calvin
    Hi everyone! I apologize if this is a really stupid question. I have data in the format: etc etc etc <span>etc etc etc</span> etc etc etc etc etc etc <span>etc etc etc</span> etc etc etc etc etc etc <span>etc etc etc</span> etc etc etc Is there a way to grep each line for a match that falls outside of the span tags?

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  • How to set the cursor in kEventControlSetCursor?

    - by fret
    I want to be able to change the appearance of the mouse cursor as it moves over various hot spots in my view's and it seems to me that I should be doing that in the kEventControlSetCursor handler (which I can get). The function "SetCursor" is deprecated, which leads to the question, what do I call to actually change the cursor? And is there some standard list of cursors I can use? Things like horizontal and vertical arrows? I beam?

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  • How to 'assign' a value to an output reg in Verilog?

    - by Rafael Almeida
    ( insert really basic question disclaimer here ) More specifically, I have the following declaration: output reg icache_ram_rw And in some point of the code I need to put the zero value in this reg. Here's what I've tried and the outcomes: assign icache_ram_rw = 1'b0; ( declarative lvalue or port sink reg icache_ram_rw must be a wire ) icache_ram_rw <= 1'b0; ( instance gate/name for type "icache_ram_rw" expected - <= read ) How do I do it after all?!

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  • mysql enum performance: is enum slower than INT

    - by JP19
    Hi, Is it better to have a field status enum('active', 'hidden', 'deleted') OR status tinyint(3) with a lookup table. Assume that status can take only one value at a time. In particular, I am interested in knowing, are operations on enum significantly slower than or as fast as operations on int ? There is a related question on SO Mysql: enum confusion but i) It does not discuss performance at all ii) There is very little explanation on WHY one approach is better than the other. regards, JP

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  • What reasons have people had to write their own classloader

    - by montyontherun
    I was recently asked in an interview about the order in which classloaders are called when a class is loaded. Unfortunately I've never had the need to write my own classloader so at the time was unfamiliar with the intricacies of classloading. This got me wondering, what reasons are their to write your own classloader. So that's my question: What scenarios have people faced which required the need to writing their own classloaders?

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  • What are all the instances of syntactic sugar in Scala?

    - by Jackson Davis
    I decided to create this question to have a single source for all things syntactic sugar in Scala. I feel these details are some of the things most frustrating to starting users and are hard to search for since most/all of them are purely symbols and are thus hard to search for without knowing the name of the concept. TODO: implicit conversions _ syntax for anonymous functions Extractors(Unapply/UnapplySeq) Other things I'm forgetting

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