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  • Advice on String Similarity Metrics (Java). Distance, sounds like or combo?

    - by andreas
    Hello, A part of a process requires to apply String Similarity Algorithms. The results of this process will be stored and produce lets say SS_Dataset. Based on this Dataset, further decisions will have to be made. My questions are: Should i apply one or more string similarity algorithms to produce SS_Dataset ? Any comparisons between algorithms that calculate the 'distance' and the 'Sounds Like' similarity ? Does one family of algorithms produces more accurate results over the other? Does a combination give more accurate results on similarity? Can you recommend implementations that you have worked with? My implementation will include packages from the following libraries http://www.dcs.shef.ac.uk/~sam/simmetrics.html http://jtmt.sourceforge.net/ Regards,

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  • Trying to calculate the 10001st prime number in Java.

    - by user247679
    Greetings. I am doing Problem 7 from Project Euler. What I am supposed to do is calculate the 10001st prime number. (A prime number being a number that is only divisible by itself and one.) Here is my current program: public class Problem7 { public static void main(String args []){ long numberOfPrimes = 0; long number = 2; while (numberOfPrimes < 10001){ if(isPrime(number)){ numberOfPrimes++; } number++; } System.out.println("10001st prime: "+ number); } public static boolean isPrime(long N) { if (N <= 1) return false; else return Prime(N,N-1); } public static boolean Prime(long X,long Y) { if (Y == 1) return true; else if (X % Y == 0) return false; else return Prime(X, Y-1); } } It works okay with finding, say the 100th prime number, but when I enter very large numbers such as 10001 it causes a stack overflow. Does anyone know of a way to fix this? Thanks for reading my problem!

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  • I am having trouble using FileReader to write a txt file to an array (Java), what am I doing wrong?

    - by deliriumtremens
    Scanner s = null; try { s = new Scanner(new BufferedReader(new FileReader("rates.txt"))); for (int i=0; i<9; i++){ while(s.hasNext()){rates[i] = s.next();} System.out.println(rates[i]); } }catch (IOException e){ System.out.println(e); } finally { if (s != null) { s.close(); } } When I run this code, it reads the last chunk of characters in my txt file, places them in rates[0], sticks null in 1-8, then puts that same last chunk in rates[9]. I'm not sure why it's reading the end of my file first. The contents of the txt are below.. USD 1.34 EUR 1.00 JPY 126.28 GBP 0.88 INR 60.20 It reads the 60.20, which is all it is recording in the array. Any help would be appreciated.

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  • Simple MPEG Video Stream player, cross-platform, in java, via NetBeans + Swing?

    - by DanM
    Hello all, Trying to build a very simple video player component in a JPanel (or something similar) to sit in a swing app, connect to an mpeg (or, really, anything VLC can output) video stream, and play it. Don't need any controls or anything -- just a live connection to the video stream. It has to be cross-platform -- at least Mac and Windows (linux would be a nice bonus, but not necessary). I'm developing in NetBeans, so any specifics regarding that would be extra-helpful. JMF? Xuggler? Help! Thanks.

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  • Java: How to get the first day of the current week and month?

    - by cesarlinux
    Hello, I have the date of several events expressed in milliseconds*, and I want to know which events are inside the current week and the current month, but I can't realize how to obtain the first day (day/month/year) of the running week and convert it to milliseconds, the same for the first day of the month. *Since January 1, 1970, 00:00:00 GMT Thanks in advance.

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  • java: can I convert strings with String.getBytes() without the BOM?

    - by Cheeso
    Suppose I have this code: String encoding = "UTF-16"; String text = "[Hello StackOverflow]"; byte[] message= text.getBytes(encoding); If I display the byte array in message, the result is: 0000 FE FF 00 5B 00 48 00 65 00 6C 00 6C 00 6F 00 20 ...[.H.e.l.l.o. 0010 00 53 00 74 00 61 00 63 00 6B 00 4F 00 76 00 65 .S.t.a.c.k.O.v.e 0020 00 72 00 66 00 6C 00 6F 00 77 00 5D .r.f.l.o.w.] As you can see, there's a BOM in the beginning. How can I: generate a UTF-16 byte array that lacks a BOM ? convert from a byte array that contains UTF=16 chars but lacks a BOM, back to a string?

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  • How to limit an upload speed in java servlet?

    - by den-javamaniac
    Hi. I'm working on an app (based on Spring as DI and MVC framework) that has a file upload function which is currently implemented using Spring Multipart Upload (which in it's turn utilizes commons fileupload libs). So what I'm looking for is a way to lower the upload bandwidth consumption. How can I accomplish that?

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  • Should primitive types or non-primitive types be preferred in Java interfaces?

    - by Greg Mattes
    (I thought I once read something about this in a book, but now I'm not sure where to find it. If this question reminds you of some material that you've read, please post a reference!) What are the pros and the cons of primitives in interfaces? In other words, is one of these preferable to the other and why? Perhaps one is preferable to the other in certain contexts? public interface Foo { int getBar(); } or public interface Foo { Integer getBar(); } Similarly: public interface Boz { void someOperation(int parameter); } or public interface Boz { void someOperation(Integer parameter); } Obviously there's the issue of having to deal with nulls in the non-primitive case, but are there deeper concerns?

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  • Java & android: Help linking an item in a listView to its correct view, but not the way i know of.

    - by Capsud
    Hi, i'm developing an android app, and what i have is a String array of restaurants in one class... static final String[] AtoZ = new String[] { "Ananda", "Brambles Cafe", "Brannigans", "Buona Sera", "Cafe Mao", "Cafe Mimo", "Dante", "Eddie Rockets", "Frango's World Cuisine", "Nando's", "Overends Restaurant @ Airfield House", "Pizza Hut", "Roly Saul", "Siam Thai","Smokey Joes","Sohag Tandoori", "TGI Friday","The Rockfield Lounge", "Winters Bar", "Al Boschetto","Baan Thai", "Bella Cuba", "Bellamys","Bianconis","Canal Bank Cafe", "Canalettos Restaurant","Chandni Restaurant", "Chill Out Cafe", "Crowes", "Da Vincenzo", "Druids", "Dylan", "Epic Restaurant", "Jewel in the Crown", "Juniors", "Kanum Thai","Kites", "Koishi","Maia Restaurant", "Mangetu Restaurant", "Millers Pizza Kitchens", "O'Connells Restaurant", "Ocras Restaurant", "Orchid Szechuan Restaurant", "Roly's Bistro", "Ryans Beggars Bush", }; i have created a view for each of these restaurants aswell in my layouts folder. so this array is going to be displayed in a listView in my android app. What i want to know is what is the quickest way of linking the item clicked to its correct view, without having to type out each position in the array and have a serious of if statements which would take a year with this! i dont want to be doing something like this if(position == 1){ setContentView(R.layout.bentleys); as it would take a year doing that for each one... Please help. thanks alot.

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  • h2 (embedded mode ) database files problem

    - by aeter
    There is a h2-database file in my src directory (Java, Eclipse): h2test.db The problem: starting the h2.jar from the command line (and thus the h2 browser interface on port 8082), I have created 2 tables, 'test1' and 'test2' in h2test.db and I have put some data in them; when trying to access them from java code (JDBC), it throws me "table not found exception". A "show tables" from the java code shows a resultset with 0 rows. Also, when creating a new table ('newtest') from the java code (CREATE TABLE ... etc), I cannot see it when starting the h2.jar browser interface afterwards; just the other two tables ('test1' and 'test2') are shown (but then the newly created table 'newtest' is accessible from the java code). I'm inexperienced with embedded databases; I believe I'm doing something fundamentally wrong here. My assumption is, that I'm accessing the same file - once from the java app, and once from the h2 console-browser interface. I cannot seem to understand it, what am I doing wrong here?

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  • OpenCV to JNI how to make it work?

    - by user293252
    I am tring to use opencv and java for face detection, and in that pursit i found this "JNI2OPENCV" file....but i am confused on how to make it work, can anyone help me? http://img519.imageshack.us/img519/4803/askaj.jpg and the following is the FaceDetection.java class JNIOpenCV { static { System.loadLibrary("JNI2OpenCV"); } public native int[] detectFace(int minFaceWidth, int minFaceHeight, String cascade, String filename); } public class FaceDetection { private JNIOpenCV myJNIOpenCV; private FaceDetection myFaceDetection; public FaceDetection() { myJNIOpenCV = new JNIOpenCV(); String filename = "lena.jpg"; String cascade = "haarcascade_frontalface_alt.xml"; int[] detectedFaces = myJNIOpenCV.detectFace(40, 40, cascade, filename); int numFaces = detectedFaces.length / 4; System.out.println("numFaces = " + numFaces); for (int i = 0; i < numFaces; i++) { System.out.println("Face " + i + ": " + detectedFaces[4 * i + 0] + " " + detectedFaces[4 * i + 1] + " " + detectedFaces[4 * i + 2] + " " + detectedFaces[4 * i + 3]); } } public static void main(String args[]) { FaceDetection myFaceDetection = new FaceDetection(); } } CAn anyone tell me how can i make this work on Netbeans?? I tried Google but help on this particular topic is very meger. I have added the whole folder as Llibrary in netbeans project and whe i try to run the file i get the followig wrroes. Exception in thread "main" java.lang.UnsatisfiedLinkError: FaceDetection.JNIOpenCV.detectFace(IILjava/lang/String;Ljava/lang/String;)[I at FaceDetection.JNIOpenCV.detectFace(Native Method) at FaceDetection.FaceDetection.<init>(FaceDetection.java:19) at FaceDetection.FaceDetection.main(FaceDetection.java:29) Java Result: 1 BUILD SUCCESSFUL (total time: 2 seconds) CAn anyone tell me the exact way to work with this? like what all i have to do?

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  • regular expression to remove original message from reply mail using in java ?

    - by ravi ravi
    In my forum, users can reply through email. I am handling mails from their reply. When they are replying the original message getting appended. I want to get only the reply message not the original message. I have to write regular expression for gmail & hotmail. I written regex for gmail as follows : \n.wrote:(?s).--End of Post-- It is removing the original message except date. I want to remove the date also. before removing the original message : " hi 33 On Tue, May 11, 2010 at 4:18 PM, Mmmmm, Rrrrr wrote: The following update has been posted to this discussion: test as user 222 [$MESSAGE_SIGNATURE_HEADER$] --End of Post-- " When I use the above regex it is filtering as follows : " hi 33 On Tue, May 11, 2010 at 4:18 PM, Mmmmm, Rrrrr " Here i want only the actual message 'hi 33' not that date. How can I filter the date using above regex? Also I need regex for Hotmail also. I appreciate for any reply. Thanks in advance.

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  • importing an existing x509 certificate and private key in Java keystore to use in ActiveMQ ssl context

    - by Aleksandar Ivanisevic
    I have this in activemq config <sslContext> <sslContext keyStore="file:/home/alex/work/amq/broker.ks" keyStorePassword="password" trustStore="file:${activemq.base}/conf/broker.ts" trustStorePassword="password"/> </sslContext> I have a pair of x509 cert and a key file How do I import those two to be used in ssl and ssl+stomp connectors? All examples i could google always generate the key themselves, but I already have a key. I have tried keytool -import -keystore ./broker.ks -file mycert.crt but this only imports the certificate and not the key file and results in 2009-05-25 13:16:24,270 [localhost:61612] ERROR TransportConnector - Could not accept connection : No available certificate or key corresponds to the SSL cipher suites which are enabled. I have tried concatenating the cert and the key but got the same result How do I import the key?

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  • Java - JPA - When we need more than one EntityManager?

    - by Yatendra Goel
    I am learning JPA and have one question: In which situations we need more than one EntityManager in our application? The two situations that I am aware of are as follows: When our application is a multi-threaded application and more than one thread needs JPA transaction because EntityManager is not thread-safe and we need one EntityManager per thread. When any of the thread needs multiple concurrent transactions, we need more than one EntityManager in that thread because there is one-to-one relationship between EntityManager and EntityTransaction. Q1. Are there any other situations when we need more than one EntityManager? ================================================================================= Q2. Upto my understanding, there should be only one EntityManagerFactory per Persitence Unit. Am I correct? If not, then what are those situations when we need multiple EntityManagerFactory per Persistence Unit?

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  • How do I avoid repetition in Java ResourceBundle strings?

    - by Trejkaz
    We had a lot of strings which contained the same sub-string, from sentences about checking the log or how to contact support, to branding-like strings containing the company or product name. The repetition was causing a few issues for ourselves (primarily typos or copy/paste errors) but it also causes issues in that it increases the amount of text our translator has to translate. The solution I came up with went something like this: public class ExpandingResourceBundleControl extends ResourceBundle.Control { public static final ResourceBundle.Control EXPANDING = new ExpandingResourceBundleControl(); private ExpandingResourceBundleControl() { } @Override public ResourceBundle newBundle(String baseName, Locale locale, String format, ClassLoader loader, boolean reload) throws IllegalAccessException, InstantiationException, IOException { ResourceBundle inner = super.newBundle(baseName, locale, format, loader, reload); return inner == null ? null : new ExpandingResourceBundle(inner, loader); } } ExpandingResourceBundle delegates to the real resource bundle but performs conversion of {{this.kind.of.thing}} to look up the key in the resources. Every time you want to get one of these, you have to go: ResourceBundle.getBundle("com/acme/app/Bundle", EXPANDING); And this works fine -- for a while. What eventually happens is that some new code (in our case autogenerated code which was spat out of Matisse) looks up the same resource bundle without specifying the custom control. This appears to be non-reproducible if you write a simple unit test which calls it with and then without, but it occurs when the application is run for real. Somehow the cache inside ResourceBundle ejects the good value and replaces it with the broken one. I am yet to figure out why and Sun's jar files were compiled without debug info so debugging it is a chore. My questions: Is there some way of globally setting the default ResourceBundle.Control that I might not be aware of? That would solve everything rather elegantly. Is there some other way of handling this kind of thing elegantly, perhaps without tampering with the ResourceBundle classes at all?

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  • How to manage the default Java SwingWorker thread pool?

    - by Guy Lancaster
    I've got an application that uses 2 long-running SwingWorker tasks and I've just encountered a couple of Windows computers with updated JVMs that only start one of the them. There are no errors indicated so I have to assume that the default thread pool has only a single thread and therefore the second SwingWorker object is getting queued when I try to execute it. So, (1) how do I check check how many threads are available in the default SwingWorker thread pool, and (2) how do I add threads if I'm going to need more? Anything else that I should know? This apparent single-thread thread-pool situation goes against all of my expectations. I'm setting up a ThreadPoolExecutor but this seems so wrong...

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  • Is there a standard Java utility to parse XSD files at runtime?

    - by Andrew
    I've been looking around for a way to programmatically parse XSD files to generate an XML mapping so that I can take any XSD file and create a parser that will parse any XML file that conforms to it, and my google-fu has been coming up short. XSOM looks promising, as it will parse an XSD file and make all its attributes available in a straight forward way. Are there any other options or standard libraries available that will produce an XML file parser from an XSD file? [Conclusion] Thanks everyone for your responses, they were a real help. I was able to write implementations using JAXP, Eclipses EMF and in XSOM that all worked as desired. JAXP was very straight forward and easy to learn and do. EMF was actually a pain to get going properly, there were so many jars that had to be included for it to work standalone that I would not recommend it. XSOM was even simpler than the JAXP implementation, so I went with it in the end.

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  • I'm getting an error in my Java code but I can't see whats wrong with it. Help?

    - by Fraz
    The error i'm getting is in the fillPayroll() method in the while loop where it says payroll.add(employee). The error says I can't invoke add() on an array type Person but the Employee class inherits from Person so I thought this would be possible. Can anyone clarify this for me? import java.io.*; import java.util.*; public class Payroll { private int monthlyPay, tax; private Person [] payroll = new Person [1]; //Method adds person to payroll array public void add(Person person) { if(payroll[0] == null) //If array is empty, fill first element with person { payroll[payroll.length-1] = person; } else //Creates copy of payroll with new person added { Person [] newPayroll = new Person [payroll.length+1]; for(int i = 0;i<payroll.length;i++) { newPayroll[i] = payroll[i]; } newPayroll[newPayroll.length] = person; payroll = newPayroll; } } public void fillPayroll() { try { FileReader fromEmployee = new FileReader ("EmployeeData.txt"); Scanner data = new Scanner(fromEmployee); Employee employee = new Employee(); while (data.hasNextLine()) { employee.readData(data.nextLine()); payroll.add(employee); } } catch (FileNotFoundException e) { System.out.println("Error: File Not Found"); } } }

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  • How can I do batch image processing with ImageJ in Java or clojure?

    - by Robert McIntyre
    I want to use ImageJ to do some processing of several thousand images. Is there a way to take any general imageJ plugin and apply it to hundreds of images automatically? For example, say I want to take my thousand images and apply a polar transformation to each--- A polar transformation plugin for ImageJ can be found here: http://rsbweb.nih.gov/ij/plugins/polar-transformer.html Great! Let's use it. From: [http://albert.rierol.net/imagej_programming_tutorials.html#How%20to%20automate%20an%20ImageJ%20dialog] I find that I can apply a plugin using the following: (defn x-polar [imageP] (let [thread (Thread/currentThread) options ""] (.setName thread "Run$_polar-transform") (Macro/setOptions thread options) (IJ/runPlugIn imageP "Polar_Transformer" ""))) This is good because it suppresses the dialog which would otherwise pop up for every image. But running this always brings up a window containing the transformed image, when what I want is to simply return the transformed image. The stupidest way to do what I want is to just close the window that comes up and return the image which it was displaying. Does what I want but is absolutely retarded: (defn x-polar [imageP] (let [thread (Thread/currentThread) options ""] (.setName thread "Run$_polar-transform") (Macro/setOptions thread options) (IJ/runPlugIn imageP "Polar_Transformer" "") (let [return-image (IJ/getImage)] (.hide return-image) return-image))) I'm obviously missing something about how to use imageJ plugins in a programming context. Does anyone know the right way to do this? Thanks, --Robert McIntyre

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  • Anyone know of a good open source spam checker in java or c#?

    - by Spines
    I'm creating a site where users can write articles and comment on the articles. I want to automatically check to see if a new article or comment is spam. What are good libraries for doing this? I looked at bayesian classifier libraries, but it seems that I would have to gather a large amount of samples and classify them all as spam or not spam myself... I'm looking for something that can hopefully just tell me right out of the box.

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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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