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  • how to implement k-means for simple grouping in java

    - by thandar
    Hi all, I would like to know simple k-means algorithm in java. I want to use k-means only for grouping one dimensional array not multi. For example, before grouping the array consists of 2,4,7,5,12,34,18,25 if we want four group then we got group 1: 2,4,5 group 2: 7,12 group 3: 18,25 group 4: 34

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  • How is hashCode() calculated in Java.

    - by Jothi
    What value is hashCode() method is returning in java?. i read that it is an memory reference of an object. when i print hascode value for new Integer(1), its 1. for String(a) - 97. so i confused. is it ascii or what type of value is?

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  • Cross developping targetting both Java Swing and GWT

    - by WizardOfOdds
    Does anyone know of any tool that can facilitate/ease porting of an app to both Java Swing and GWT? I've got a few "screens" that makes complete sense to have both in a desktop app and in a browser and I was wondering if there was some kind of common API that could be targetted that would facilitate creating these two different "views" (see my comment)?

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  • java native Process timeout

    - by deltanovember
    At the moment I execute a native process using the following: java.lang.Process process = Runtime.getRuntime().exec(command); int returnCode = process.waitFor(); Suppose instead of waiting for the program to return I wish to terminate if a certain amount of time has elapsed. How do I do this?

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  • Cooking Units in Java

    - by gregm
    Are there any open source libraries for representing cooking units such as Teaspoon and tablespoon in Java? I have only found JSR-275 (http://jscience.org/jsr-275/) which is great but doesn't know about cooking units.

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  • Java applet for Tower of Hanoi

    - by Naren
    I am planning to write a Java applet for Tower of Hanoi similar to link( http://www.mazeworks.com/hanoi/index.htm ) Can you suggest how should I start and proceed. And, btw, does it require multi threading? And also, major part of my doubt is to make a disc being clickable and being able to drag and drop the disc on a tower. detect a tower (if a disc is being dragged using mouse)

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  • Output on namespaced xpath in java

    - by user347928
    I have the following code and have had some trouble with a specific field and it's output. The namespace is connected but doesn't seem to be outputting on the required field. Any info on this would be great. import org.w3c.dom.Document; import org.xml.sax.SAXException; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.ParserConfigurationException; import javax.xml.xpath.XPathFactory; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathExpressionException; import java.io.ByteArrayInputStream; import java.io.IOException; public class test { public static void main(String args[]) { String xmlStr = "<aws:UrlInfoResponse xmlns:aws=\"http://alexa.amazonaws.com/doc/2005-10-05/\">\n" + " <aws:Response xmlns:aws=\"http://awis.amazonaws.com/doc/2005-07-11\">\n" + " <aws:OperationRequest>\n" + " <aws:RequestId>blah</aws:RequestId>\n" + " </aws:OperationRequest>\n" + " <aws:UrlInfoResult>\n" + " <aws:Alexa>\n" + " <aws:TrafficData>\n" + " <aws:DataUrl type=\"canonical\">harvard.edu/</aws:DataUrl>\n" + " <aws:Rank>1635</aws:Rank>\n" + " </aws:TrafficData>\n" + " </aws:Alexa>\n" + " </aws:UrlInfoResult>\n" + " <aws:ResponseStatus xmlns:aws=\"http://alexa.amazonaws.com/doc/2005-10-05/\">\n" + " <aws:StatusCode>Success</aws:StatusCode>\n" + " </aws:ResponseStatus>\n" + " </aws:Response>\n" + "</aws:UrlInfoResponse>"; DocumentBuilderFactory xmlFact = DocumentBuilderFactory.newInstance(); xmlFact.setNamespaceAware(true); DocumentBuilder builder = null; try { builder = xmlFact.newDocumentBuilder(); } catch (ParserConfigurationException e) { e.printStackTrace(); } Document doc = null; try { doc = builder.parse( new ByteArrayInputStream( xmlStr.getBytes())); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } System.out.println(doc.getDocumentElement().getNamespaceURI()); System.out.println(xmlFact.isNamespaceAware()); String xpathStr = "//aws:OperationRequest"; XPathFactory xpathFact = XPathFactory.newInstance(); XPath xpath = xpathFact.newXPath(); String result = null; try { result = xpath.evaluate(xpathStr, doc); } catch (XPathExpressionException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } System.out.println("XPath result is \"" + result + "\""); } }

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  • Is Java assert broken?

    - by BlairHippo
    While poking around the questions, I recently discovered the assert keyword in Java. At first, I was excited. Something useful I didn't already know! A more efficient way for me to check the validity of input parameters! Yay learning! But then I took a closer look, and my enthusiasm was not so much "tempered" as "snuffed-out completely" by one simple fact: you can turn assertions off.* This sounds like a nightmare. If I'm asserting that I don't want the code to keep going if the input listOfStuff is null, why on earth would I want that assertion ignored? It sounds like if I'm debugging a piece of production code and suspect that listOfStuff may have been erroneously passed a null but don't see any logfile evidence of that assertion being triggered, I can't trust that listOfStuff actually got sent a valid value; I also have to account for the possibility that assertions may have been turned off entirely. And this assumes that I'm the one debugging the code. Somebody unfamiliar with assertions might see that and assume (quite reasonably) that if the assertion message doesn't appear in the log, listOfStuff couldn't be the problem. If your first encounter with assert was in the wild, would it even occur to you that it could be turned-off entirely? It's not like there's a command-line option that lets you disable try/catch blocks, after all. All of which brings me to my question (and this is a question, not an excuse for a rant! I promise!): What am I missing? Is there some nuance that renders Java's implementation of assert far more useful than I'm giving it credit for? Is the ability to enable/disable it from the command line actually incredibly valuable in some contexts? Am I misconceptualizing it somehow when I envision using it in production code in lieu of statements like if (listOfStuff == null) barf();? I just feel like there's something important here that I'm not getting. *Okay, technically speaking, they're actually off by default; you have to go out of your way to turn them on. But still, you can knock them out entirely.

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  • java double[][] - display as image

    - by joe_shmoe
    Hi all, just wondering if there is a simple way in java to display the contents of say 16x16 array of doubles [0..1] as a greyscale image (ala matlab)? using an unfamiliar matrix library, so I'd like to check that I'm on the right track. don't really care if it is slow or ugly, or if it requires external library - it's just there for a quick look, so as long as it works, I'm fine.

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  • Getting A File's Mime Type In Java

    - by Lee Theobald
    I was just wondering how most people fetch a mime type from a file in Java? So far I've tried two utils: JMimeMagic & Mime-Util. The first gave me memory exceptions, the second doesn't close its streams off properly. I was just wondering if anyone else had a method/library that they used and worked correctly?

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  • Cleanest way to build an SQL string in Java

    - by Vidar
    I want to build an SQL string to do database manipulation (updates, deletes, inserts, selects, that sort of thing) - instead of the awful string concat method using millions of "+"'s and quotes which is unreadable at best - there must be a better way. I did think of using MessageFormat - but its supposed to be used for user messages, although I think it would do a reasonable job - but I guess there should be something more aligned to SQL type operations in the java sql libraries. Would Groovy be any good? Any help much appreciated.

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  • Pop-up window in Java Swing

    - by Gabriel Parenza
    Hey, Can someone suggest me how to implement a pop-up window in Java Swing. I want the pop-up window to be a modal window (user cannot return to the main window when the pop-up is open). I tried doing it using JDialog but it allows only one widget for user input to be in it whereas I need multiple widgets. I may be wrong here but this is what I was able to do. Appreciate your help.

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  • Java Equivalent to .NET's DateTime.Parse?

    - by Superdumbell
    I'm working on a java class that I will use with Pervasive Data Profiler that needs to check if a Date String will work with .NET's DateTime.Parse. Is there an equivalent class or 3rd party library that can give me this functionality that is very close to .NET's DateTime.Parse?

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  • Java 6 ScriptEngine and JSON.parse problem

    - by Tim
    The Rhino release that is included in Java 6 ScriptEngine does not have a JSON parser. I've tried including crockfords JSON2.js in my script on the scriptengine.eval(). When I try to do the JSON.parse, it ends up giving me a script error that .replace is an unknown function. .replace is referenced several places in JSON2, and it works fine inside a browser (IE7, IE8, FF3). Anyone see this and have a suggestion?

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