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• Java Compare Two Lists

  - by agazerboy

  Hi All, Thanks for stoping to help me :) I have a question, may be for some of you, it will be a basic question :) I have two lists ( not java lists, you can say two columns) For example **List 1** **Lists 2** milan hafil dingo iga elpha binga hafil mike meat …

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• Elusive race condition in Java

  - by nasufara

  I am creating a graphing calculator. In an attempt to squeeze some more performance out of it, I added some multithreaded to the line calculator. Essentially what my current implementation does is construct a thread-safe Queue of X values, then start however many threads it needs, each one calculating a point on the line using the queue to get…

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• Java List use through use of JSTL <c:forEach>

  - by Mark Lewis

  Hello If I have a JSF backing bean return an object of type ArrayList, I should be able to use to iterate over the elements in the list. Each element contains a map and although the question of how to access the map content through JSTL has been answered here, if I pass an array of such maps, I can't find how to iterate over them and still…

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• Building TimeZone object in Java

  - by Harish

  I build a Java TimeZone object using the TimeZone String like GMT-8,GMT,PST,EST etc. This did not consider whether the timezone is daylight saving enabled or not.Now there is a requirement to include this check and instead of giving the input as PDT or EDT the daylight saving is given as a seperate flag.I am not sure whether TimeZone has a…

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• Am i passing values or adresses? [Java]

  - by Samuel

  Hello World, I am new to java and i was asking myself, if i have a class 'Example' and somewhere i make a: Example example1 = new Example(); and i add some stuff to it, lets say example1.setExampleBoolean(false); and now i make: Example example2 = example1; example2.setExampleBoolean(true); Did i say with Example example2 = example1…

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• Why in java enum is declared as Enum<E extends Enum<E>>

  - by atamur

  if language designers were to use simply Enum<E extends Enum> how would that affect the language? The only difference now would be that someone coud write A extends Enum<B> but since it is not allowed in java to extend enums that would be still illegal. I was also thinking about someone supplying jvm a bytecode that…

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• Java OpenGL color material darkens when depth test is disabled

  - by Jeff Storey

  I've been working with the depth buffer in OpenGL (JOGL) to ensure certain items are rendered in front of others by disabling the depth buffer (detailed in my previous question http://stackoverflow.com/questions/2516086/java-opengl-saving-depth-buffer). This works, except when I set the color of an item that is being drawn when the…

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• JAVA: Sort ArrayList<ArrayList<Integer>> on multiple columns

  - by Bob

  First, I did do my homework searching before posting here. My requirement seems to be slightly different compared to questions posted out there. I have a matrix like ArrayList<ArrayList<Integer>> in the following form | id1 | id2 | score | |-----|-----|-------| | 1 | 3 | 95% | | 1 | 2 | 100% | | 1 | 4 |…

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• Creating a CD-burning feature for a music player based on Java

  - by jjanggoo

  Hi, I'm trying to create a CD-burning feature for a Java-based music player for my school project. Since I'm new to real-life programming (I've only learned to write codes on AP Computer Science A level), I don't know how I can apply the concepts I learned from APCS A to this task. A friend of mine who is studying computer…

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• Translate Java to Python -- signing strings with PEM certificate files

  - by erikcw

  I'm trying to translate the follow Java into its Python equivalent. // certificate is contents of https://fps.sandbox.amazonaws.com/certs/090909/PKICert.pem // signature is a string that I need to verify. CertificateFactory factory = CertificateFactory.getInstance("X.509"); X509Certificate x509Certificate = …

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• Question regarding Manifest in Java jar file

  - by Tara Singh

  Hi All, Is is mandatory to have classpath inside a Manifest file inside the java jar file? can we do work without having the classpath inside it? The reason why I am asking this is because I have a jar file for a server application. When I tried to connect many connections with Server, Server went down and the error was…

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• How to specify behavior of Java BufferedImage resize: need min for pixel rows instead of averaging

  - by tucuxi

  I would like to resize a Java BufferedImage, making it smaller vertically but without using any type of averaging, so that if a pixel-row is "blank" (white) in the source image, there will be a white pixel-row in the corresponding position of the destination image: the "min" operation. The default algorithms (specified in…

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• How does Garbage Collection in Java work?

  - by Bright010957

  I was wondering how the garbage collector in Java deals with the following situation. Object A has a reference to Object B and Object B has a reference to Object C. The main program has a reference to Object A. So you can use Object B trough Object A, and Object C trough Object B trough Object A. What happens to…

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• Sparse matrices / arrays in Java

  - by DanM

  I'm working on a project, written in Java, which requires that I build a very large 2-D sparse array. Very sparse, if that makes a difference. Anyway: the most crucial aspect for this application is efficency in terms of time (assume loads of memory, though not nearly so unlimited as to allow me to use a standard…

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• Java webapp: adding a content-disposition header to force browsers "save as" behavior

  - by WizardOfOdds

  Even though it's not part of HTTP 1.1/RFC2616 webapps that wish to force a resource to be downloaded (rather than displayed) in a browser can use the Content-Disposition header like this: Content-Disposition: attachment; filename=FILENAME Even tough it's only defined in RFC2183 and not part of HTTP 1.1 it works…

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• Converting UTF-8 to ISO-8859-1 in Java - how to keep it as single byte

  - by luckylak

  Hi, I am trying to convert a string encoded in java in UTF-8 to ISO-8859-1. Say for example, in the string 'âabcd' 'â' is represented in ISO-8859-1 as E2. In UTF-8 it is represented as two bytes. C3 A2 I believe. When I do a getbytes(encoding) and then create a new string with the bytes in ISO-8859-1 encoding, I…

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• Best practices for defining and initializing variables in web.xml and then accessing them from Java

  - by DutrowLLC

  I would like to define and initialize some variables in web.xml and the access the values of these variables inside my Java application. The reason I want to do this is because I would like to be able to change the values of these variables without having to recompile the code. What is the best practice for…

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• Java 64bit install throwing non compatible 64bit error in 64bit Windows 7

  - by ThunderWolf

  JRE and JDK 64bit install executable are throwing a non compatible win32 error: jre_7u1_windows-x64bit.exe is not a valid Win32 application. I thought this could be a system environment variable problem, but from what I can tell it is not, the variable PROCESSOR_ARCHITECTURE is set as: AMD64 and the…

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• Java library for HTML analysis

  - by Raj

  Hi, (I've seen similar questions, but I think none of them cater to my specific needs, hence...) I would like to know if there is a Java library for analysis of real-world (read: incomplete, ill-formed) HTML. By analysis, I mean things like: figuring out the most prominent color in an HTML chunk…

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• Java Implementing htonl

  - by Hamza Yerlikaya

  I am communicating with a server, each message sent to the server has to be padded with the length of the message, unsigned int len = htonl(msg.size()); In C running the length through htonl and padding the message works, in Java AFAIK byte order is already in network order so I assumed all I…

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• "code too large" compilation error in java

  - by trinity

  Hello all, Is there any maximum size for code in java.. i wrote a function with more than 10,000 lines. Actually , each line assigns a value to an array variable.. arts_bag[10792]="newyorkartworld"; arts_bag[10793]="leningradschool"; arts_bag[10794]="mailart"; …

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• Java Concurrency: CAS vs Locking

  - by Hugo Walker

  Im currently reading the Book Java Concurrency in Practice. In the Chapter 15 they are speaking about the Nonblocking algorithms and the compare-and-swap (CAS) Method. It is written that the CAS perform much better than the Locking Methods. I want to ask the people which already worked with…

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• Using a PreparedStatement to persist an array of Java Enums to an array of Postgres Enums

  - by McGin

  I have a Java Enum: public enum Equipment { Hood, Blinkers, ToungTie, CheekPieces, Visor, EyeShield, None;} and a corresponding Postgres enum: CREATE TYPE equipment AS ENUM ('Hood', 'Blinkers', 'ToungTie', 'CheekPieces', 'Visor', 'EyeShield', 'None'); Within my database I have a table…

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• java immutable object question

  - by cometta

  String abc[]={"abc"}; String def[]={}; def=abc; def[0]=def[0]+"changed"; System.out.println(abc[0]); by changing "def" object, my abc object is changed as well. Beside String[] array has this characteristic what other java object has similar characteristic? can explain more? in order…

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• java cosine similarity problem

  - by agazerboy

  Hi again :) I developed some java program to calculate cosine similarity on the basis of TF*IDF. It worked very well. But there is one problem.... :( for example: If I have following two matrix and I want to calculate cosine similarity it does not work as rows are not same in length doc…

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