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  • Good Hash Function for Strings

    - by Leif Andersen
    I'm trying to think up a good hash function for strings. And I was thinking it might be a good idea to sum up the unicode values for the first five characters in the string (assuming it has five, otherwise stop where it ends). Would that be a good idea, or is it a bad one? I am doing this in Java, but I wouldn't imagine that would make much of a difference.

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  • Can a BufferedImage be written to file any format?

    - by ncoder
    Is it correct that if we have a BufferedImage object in java, we could potentially write it out in ANY format using ImageIO.write (if we have a Writer object for the same)? I tried writing a BufferedImage object into a jpg file, it outputted an empty image file however when i tried writing it in to a png file, it worked fine.

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  • pop a frame

    - by somya agrawal
    I am working on a project (Java, Swing) in which i have to pop a frame on clicking a hyperlink. but the coding for the frame and all its components is done in a different class and that hyperlink exists in a different class. what shall i do to pop that frame on clicking of the hyperlink please tell. thanks.

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  • Open source media player

    - by theringostarrs
    Hi, I am looking for an open-source iTunes style media player that I can use as a base for functionality I would like to develop. I am quite keen on Flex/Air, or C# or Java will do for languages. Does anyone know of any projects?

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  • Hibernate HQL with interfaces

    - by Benju
    According to this section of the Hibernate documentation I should be able to query any java class in HQL http://docs.jboss.org/hibernate/core/3.3/reference/en/html/queryhql.html#queryhql-polymorphism Unfortunately when I run this query... "from Transaction trans where trans.envelopeId=:envelopeId" I get the message "Transaction is not mapped [from Transaction trans where trans.envelopeId=:envelopeId]". Transaction is an interface, I have to entity classes that implement it, I want on HQL query to return a Collection of type Transaction.

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  • jdbc nested transactions

    - by Nrj
    What is the behaviour of nested transactions. I am using java + jdbc ? Eg: tx1.begin do stuff1 tx2.begin do stuff2 tx2.commit do stuff1.1 tx1.rollback tx2 is basically inside another function. Will the results from tx2 be persisted ? In case behaviour is db specific, what is it in case of Sql server 2005 ?

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  • Is it possible to gzip and upload this string to Amazon S3 without ever being written to disk?

    - by BigJoe714
    I know this is probably possible using Streams, but I wasn't sure the correct syntax. I would like to pass a string to the Save method and have it gzip the string and upload it to Amazon S3 without ever being written to disk. The current method inefficiently reads/writes to disk in between. The S3 PutObjectRequest has a constructor with InputStream input as an option. import java.io.*; import java.util.zip.GZIPOutputStream; import com.amazonaws.auth.PropertiesCredentials; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3Client; import com.amazonaws.services.s3.model.PutObjectRequest; public class FileStore { public static void Save(String data) throws IOException { File file = File.createTempFile("filemaster-", ".htm"); file.deleteOnExit(); Writer writer = new OutputStreamWriter(new FileOutputStream(file)); writer.write(data); writer.flush(); writer.close(); String zippedFilename = gzipFile(file.getAbsolutePath()); File zippedFile = new File(zippedFilename); zippedFile.deleteOnExit(); AmazonS3 s3 = new AmazonS3Client(new PropertiesCredentials( new FileInputStream("AwsCredentials.properties"))); String bucketName = "mybucket"; String key = "test/" + zippedFile.getName(); s3.putObject(new PutObjectRequest(bucketName, key, zippedFile)); } public static String gzipFile(String filename) throws IOException { try { // Create the GZIP output stream String outFilename = filename + ".gz"; GZIPOutputStream out = new GZIPOutputStream(new FileOutputStream(outFilename)); // Open the input file FileInputStream in = new FileInputStream(filename); // Transfer bytes from the input file to the GZIP output stream byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } in.close(); // Complete the GZIP file out.finish(); out.close(); return outFilename; } catch (IOException e) { throw e; } } }

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  • Performance testing Flex applications

    - by Fergal
    What's the best method for performance testing Flex applications with a BlazeDS/Java severs backend. We're looking at JMeter but can it be used with the amf the protocol at a more sophisticated level where values in a request can be manipulated?

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  • Runtime.getRuntime.exec() problem with running Word document

    - by Milan
    Hello everybody! when I write in commandline in windows: C:\Program Files (x86)\Microsoft Office\Office12>winword.exe /mOpenPage c:\Navod ilo.doc It starts the word document with the macro /mOpenPage. I want to do the same thing from Java but its not going. String[] cmd = {"cmd.exe","/c","start","c:\\Program Files (x86)\\Microsoft Office\\Office12\\WINWORD.exe","/mOpenPage","c:\\Navodilo.doc"}; Process proc = Runtime.getRuntime().exec(cmd); help?

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  • How to deploy axis2 + MyBatis

    - by henry
    I am trying to do webservice (I am quite new in Webservice under java). I am using netbeans. Axis2 is having problem trying to locate the the xml configuration file for mybatis Anyone can tell me how to successfully deploy mybatis configuration. Should I manually copy the configuration under .netbeans\6.8\apache-tomcat-6.0.20_base\webapps\axis2\WEB-INF\classes or there is any other setting?

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  • MDI in SWT on Linux??!

    - by Daziplqa
    I'd like to create an MDI application using SWT. I've done extensive searches and reach that the Decorations Object is the one responsable for trying supporting behavior. However, I've a Linux box, and the example provided here: http://java-gui.info/Apress-The.Definitive.Guide.to.SWT.and.JFace/8886final/LiB0070.html#ch08fig02 doesn't works with me. the output of the example provided by the above link is: However, On Linux (GTK), I see only labels without control bars or boxes!! could you please help?

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  • running python from an android app

    - by Stacia
    Hi everyone, I am trying to run a python script through an application I've written. I found some pages which say that this piece of code is doing it, but I can't figure it out. http://code.google.com/p/android-scripting/source/browse/android/AndroidScriptingEnvironment/src/com/google/ase/locale/LocaleReceiver.java Can someone explain what is going on and how I can edit that to run an arbitrary script file in my project directory?

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  • Is there a way to turn on some sort of JVM logging so I can see whats happening during classloading

    - by Spines
    I'm trying to optimize the startup time/class loading time of my Java web app because its on the Google App Engine and startup time is important. Is there a way I can turn on some sort of class loading debug messages or someway to see where time is being spent while class loading? I want to see if any specific libraries take a while to load and then get rid of them if they aren't essential.

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  • 2D Array values frequency

    - by Morano88
    If I have a 2D array that is arranged as follows : String X[][] = new String [][] {{"127.0.0.9", "60", "75000","UDP", "Good"}, {"127.0.0.8", "75", "75000","TCP", "Bad"}, {"127.0.0.9", "75", "70000","UDP", "Good"}, {"127.0.0.1", "", "70000","UDP", "Good"}, {"127.0.0.1", "75", "75000","TCP", "Bad"} }; I want to know the frequency of each value .. so I27.0.0.9 gets 2. How can I do a general solution for this ? In Java or any algorithm for any language ?

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