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• trait implementation

  - by Jeriho

  If I have some traits like: trait A {...} trait B extends A{...} trait C1 extends B{...} trait C2 extends A{...} I can write class in two ways (C1 and C2 add same functionality) class Concrete1 extends B with C1 class Concrete2 extends B with C2 What variant is better(efficient)?

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• Centering strings with printf()

  - by Pieter

  By default, printf() seems to align strings to the right. printf("%10s %20s %20s\n", "col1", "col2", "col3"); /* col1 col2 col3 */ I can also align text to the left like this: printf("%-10s %-20s %-20s", "col1", "col2", "col3"); Is there a quick way to center text? Or do I have to write a function that turns a string like test into (space)(space)test(space)(space) if the text width for that column is 8?

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• Does Java allow you to use native UI widgets on Mac OS X?

  - by Colen

  Hello, If I write an application in java, does it use native widgets if run on Mac OS X? Or does it use "lookalike" widgets provided by the java runtime? Thanks.

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• How to get the list of price offers on an item from Amazon with python-amazon-product-api item_looku

  - by miernik

  I am trying to write a function to get a list of offers (their prices) for an item based on the ASIN: def price_offers(asin): from amazonproduct import API, ResultPaginator, AWSError from config import AWS_KEY, SECRET_KEY api = API(AWS_KEY, SECRET_KEY, 'de') str_asin = str(asin) node = api.item_lookup(id=str_asin, ResponseGroup='Offers', Condition='All', MerchantId='All') for a in node: print a.Offer.OfferListing.Price.FormattedPrice I am reading http://docs.amazonwebservices.com/AWSECommerceService/latest/DG/index.html?ItemLookup.html and trying to make this work, but all the time it just says: Failure instance: Traceback: <type 'exceptions.AttributeError'>: no such child: {http://webservices.amazon.com/AWSECommerceService/2009-10-01}Offer

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• Is there something like the OllyDbg / SoftICE disassembler + debugger for java?

  - by Ran Biron

  Is there a utility similar to OllyDbg / SoftICE for java? I.e. execute class (from jar / with class path) and, without source code, show the disassembly of the intermediate code with ability to step through / step over / search for references / edit specific intermediate code in memory / apply edit to file... If not, is it even possible to write something like this (assuming we're willing to live without hotspot for the debug duration)?

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• What has your experience been like developing for the Netbeans platform for cross platform developme

  - by Magwich

  I am familiar with the Netbeans IDE, but I want to know about people's experience with using Netbeans as a development platform (i.e. using its prebuilt modules for fast gui development). I have a program that I want to write, and I am thinking about using this platform.

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• Is it possible to update on Firebird database from a trigger in another Firebird database?

  - by williamsdb

  I have two firebird databases running on the same server and I want to write to a table on one of the databases from a trigger on the other database when certain actions occur. I have had a search and cannot find out if this is possible. Can it be done either natively in firebird or via a UDF? Thanks Neil

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• Simulated Annealing Applications

  - by Andrei Vajna II

  Do you know any real applications for Simulated Annealing? Simulated Annealing is a heuristic algorithm used for problems like the traveling salesman or the knapsack problem. And yes, this is homework. I have to write a paper on this, and I thought this would be the best starting point. Perhaps someone actually works on a project that relies on Simulated Annealing.

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• What's the proper way to override Rails ActiveRecord creation/deletion events in a subclass, such as

  - by Paul Gibler

  Hi, I have a class heirarchy as follows: class A < ActiveRecord::Base after_create { |i| #do something } end class B < A after_create { |i| #do something else after what A did } end I want to have A's behavior performed in B when after_create is invoked, but I am not sure of the proper way to write the after_create method in B.

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• a good smart phone for java development?

  - by pstanton

  Hi all, I'd like to do some development of smart phone apps and my native programming language is java. The first application I'd like to write will need to be able to (attempt to) connect to a network (LAN or WiFi) automatically in the background (on a schedule). would an android phone be the best path or are there competitive purer java options?

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• sizeof derived already from base

  - by Oops

  Hi, is it possible to return the sizeof a derived class already from base class/struct? imho the size of a class is a kind of property of itself, like the weight of a human being. But I don't want to write the same function in every class. many thanks in advance Oops

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• Change case of argument provided to C preprocessor macro

  - by andyvn22

  I'm fairly new to the C preprocessor. Is it possible to change the case of an argument provided to a function-like #define? For example, I want to write test(size) and then involve "Size" in the resulting replacement.

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• How do I test controllers and views?

  - by ryeguy

  I'm using rails for the first time, and I love how test-oriented it is and how it encourages you to write tests. I'm just having a hard time figuring out what I should be testing when I test controllers and views. I know that you should test redirects and authorization in the controller tests, but what else? And what should go in view tests? If I'm "following the rules" and only putting loops, conditionals, and echoes in my views, then what is there left to test?

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• nokogiri: how to insert tbody tag immediately after table tag ?

  - by wefwgeweg

  i want to make sure all table's immediate child is tbody.... how can i write this with xpath or nokogiri ? doc.search("//table/").each do |j| new_parent = Nokogiri::XML::Node.new('tbody',doc) j.replace new_parent new_parent << j end

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• How to define a predicate as a function argument

  - by devoured elysium

  I want to be able to write something as void Start(some condition that might evaluate to either true or false) { //function will only really start if the predicate evaluates to true } I'd guess it must be something of the form: void Start(Predicate predicate) { } How can I check inside my Start function whenever the predicate evaluated to true or false? Is my use of a predicate correct? Thanks

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• How do I rewrite a plist if its data types are immutable?

  - by dugla

  I am getting comfortable with using plists for initializing my app. I now want to save app state back to the plist used to initialize the app and I find myself stuck. At application startup I ingest the plist into an NSDictionary which is immutable. I now want to update the NSDictionary by replacing old values with new values for existing keys and write to the plist via [NSDictionary writeToFile:atomically]. How do I get around the immutability of NSDictionary? Thanks, Doug

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• Spec. for JUnit XML Output

  - by Gilad Naor

  Where can I find the specification of JUnit's XML output. My goal is to write a UnitTest++ XML reporter which produced JUnit like output. See: "Unable to get hudson to parse JUnit test output XML" and "http://stackoverflow.com/questions/411218/hudson-c-and-unittest"

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• Java - Interfaces

  - by RayAllen

  I had a doubt .. Why do we need interface in Java ? Instead of interface can't we write the methods in the class itself ? Why do we need seperate interface?

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• Easiest way to transfer data between 2 C programs/threads?

  - by Shawn

  In ANSI C on Windows what is the best/easiest way to transfer data between two programs running concurrently without needing to write/read from a file? Data will be basic text. Thanks.

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• C# Double.ToString()

  - by Betamoo

  To format a double to certain precision in C# I write this: d.ToString("#0.00"); What if I want to force a the sign to appear.. e.g +2.54 and -2.54

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• C# monkey patching - is it possible?

  - by Adal

  Is it possible to write a C# assembly which when loaded will inject a method into a class from another assembly? If yes, will the injected method be available from languages using DLR, like IronPython? namespace IronPython.Runtime { public class Bytes : IList<byte>, ICodeFormattable, IExpressionSerializable { internal byte[] _bytes; //I WANT TO INJECT THIS METHOD public byte[] getbytes() { return _bytes; } } } I need that method, and I would like to avoid recompiling IronPython if possible.

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• How to register file types/extensions with a WiX installer?

  - by OregonGhost

  I didn't find an explicit answer to this question in the WiX Documentation (or Google, for that matter). Of course I could just write the appropriate registry keys in HKCR, but it makes me feel dirty and I'd expect this to be a standard task which should have a nice default solution. For bonus points, I'd like to know how to make it "safe", i.e. don't overwrite existing registrations for the file type and remove the registration on uninstall only if it has been registered during installation and is unchanged.

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• PHP cron script with twitter (problem with oauth)

  - by James Lin

  Hi guys, I am trying to write an php twitter script which will be run by crontab, what the script does is to get the tweets from a dedicated twitter account. I have looked at some of the php twitter oauth libraries, all of them seem to use redirect to a twitter page to get a token, then goes back to a callback link. In my case I don't want to have any user interaction at all. Could anyone please tell me what I should do? Regards James

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• union on the same table

  - by StupidDeveloper

  I have a table: ID | Id1 | Id2 1 | 100 | 12 2 | 196 | 140 3 | 196 | 141 4 | 150 | 140 5 | 150 | 199 I want to write a query that will give me a table containing records with the same ID2 and with id1 equal to 196 or 150. I thought about union: select * from table where itemId = 196 union select * from table where itemId = 150 but that doesn't cover the ID2 requirement. How should I do that?

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• Date object javascript

  - by Isis

  Hello. var date = new Date();//Mon Mar 15 2010 12:40:05 GMT+0300 (MSK) var omg = date.getDate() + 19;// 34 date.setDate(omg); document.write(date.toLocaleString()); //Sat 03 Apr 2010 12:43:00 PM MSK How do I echo the values 3 (ie: day of month), 4 (April) and the current year? alert(day); // Need 3 alert(month); // Need 4 Thank you

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