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  • Floating point arithmetics restricted to integers

    - by user396672
    I use doubles for a uniform implementation of some arithmetic calculations. These calculations may be actually applied to integers too, but there are no C++-like templates in Java and I don't want to duplicate the implementation code, so I simply use "double" version for ints. Does JVM spec guarantees the correctness of integer operations such a <=,=, +, -, *, and / (in case of remainder==0) when the operations are emulated as corresponding floating point ops? (Any integer, of course, has reasonable size to be represented in double's mantissa)

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  • transpose graph

    - by rana123
    how can i write program in java to find the transpose of the graph G, where the input and the output of the program are represented as adjacency list structure. for example: input: 12341 outout: 1432

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  • Is there a common way to access files, that works both on android and PC?

    - by m01
    Hi, I'm writing an application that will ship in two versions: Android and PC version. Is there a simple way to access files from the shared code? Using java.io is simple, but I don't know how to access android resources or assets using it. And I can't write methods that operate on FileInputStreams instead, because some files contain references to another ones, so I need a way to access them from the method code. Any suggestions?

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  • What will be the OOP approach? (or YOUR approach?)

    - by hsmit
    I'm having difficulties with some general OOP & Java approach. There are various ways to let classes/objects communicate with each other. To give a simple example: I need object A to perform action X. Object A needs P, Q and R to perform this action X. Will then Object A retrieve P, Q and R by itself (within action X), or must these values be parameters for action X?

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  • Dynamic Cocoon Block list

    - by Crischan
    Hi, I have a Cocoon 2.2 based application which uses blocks for different tasks and one block for shared pipeline fragments. All blocks are mounted within an Cocoon webapp. Now I would like to have an block which generates an overview of all other mounted blocks. I probably will have to use Java code - which is fine - but I am kinda lost where to start. Can anyone point me the right direction?

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  • Can I assign array size using NSMutableArray?

    - by Tattat
    I used to be a Java Programmer, which the array need to declare the very first time, like this: int[] anArray; // declares an array of integers anArray = new int[10]; // allocates memory for 10 integers I don't know whether the Objective C , NSMutableArray also give me this ability or not. Actually, I want to make a 10*10 array. thz in advance.

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  • What are all the concurrent things [data structure, algorithm, locking mechanism] missing in .Net 3.

    - by user49767
    First time I am bit disappointed in StackOverflow cause my http://stackoverflow.com/questions/2571727/c-concurrency-vs-java-concurrency-which-is-neatly-designed-which-is-better question was closed. My intension was just trying to gather knowledge from programming guru's who worked in both the programming technologies. Rather closing this question, please help me by discussing what is good, bad, and ugly in multi-threading part in both the platforms. It is also welcome, if someone would like to compare with .Net 4.0 with JDK 6 (or JDK 7)

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  • Use the right tool for the job: embedded programming

    - by EmbeddedProg
    I'm interested in programming languages well suited for embedded programming. In particular: Is it possible to program embedded systems in C++? Or is it better to use pure C? Or is C++ OK only if some features of the language (e.g. RTTI, exceptions and templates) are excluded? What about Java in this domain? Thanks.

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  • Is there any way static block is executed more than once? if so then how?

    - by learner
    My Understanding Static block is executed during class loading, If a class is already loaded then there is no way to load the class other than class reloading Doubt/Question 1) Is there any time JVM reloads the class? My Understanding In Class Loading JVM loads source of the Java file, so it can not keep all thousands files source is a memory, it should discard the rarely used code and reload again when it is necessary and during reload JVM is not initializing static variables and locks again(may be using some tracking mechanism) Doubt/Question 2) If my above understanding is incorrect then please correct me

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  • jQuery template and Backbone.js

    - by testndtv
    I am trying to create an app which uses a combination of jQuery templates and Backbone.js I have very little experience in both of them (though I know jQuery) Could you please provide some good examples where jQuery templates and Backbone.js are used effectively. Also I am loooking at using JSON for the model/data and trying to persist the data (I use Java at the backend)..So looking for ideas on how that can be integrated? Thank you.

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  • The device is not connected exception

    - by Dani
    I try to open a large number of files but after 5000 files or so I get Exception in thread "Main" java.io.IOException: The device is not connected Is this the expected behavior? Is there a way around it? I want to leave my code as straightforward as possible.

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  • How can I close a JFrame by click on a button?

    - by Roman
    I would like to have a button in my window such that if I click it (button) the window is closed. I found out that I can close a window in the following way: referenceToTheFrame.hide(); //hides the frame from view refToTheFrame.dispose(); //disposes the frame from memory But if I do this way, compiler complains: Note: myProgram.java uses or overrides a deprecated API Note: Recompile with -Xlint:deprication for details. Do I do something unsafe?

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  • How to I "scan" a website(or page) for info, and bring it into my program?

    - by James
    Well, I'm pretty much trying to figure out how to pull information from a webpage, and bring it into my program(in Java). For example, if I know the exact page I want info from, for the sake of simplicity a Best Buy item page, how would I get the appropriate info I need off of that page? Like the title, price, description? What would this process even be called? I have no idea were to even began researching this :'(

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  • The fundamentals of Hash tables?

    - by kylex
    I'm quite confused about the basic concepts of a Hash table. If I were to code a hash how would I even begin? What is the difference between a Hash table and just a normal array? Basically if someone answered this question I think all my questions would be answered: If I had 100 randomly generated numbers (as keys), how would I implement a hash table and why would that be advantageous over an array? Psuedo-code or Java would be appreciated as a learning tool...

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  • Is Spring hard compared to Ruby on Rails?

    - by johnny
    If I have no to little experience in either of them, but know enough Java and Ruby to be comfortable, is one framework harder to learn than the other? Is one easier to use for the beginner on these? I know it is hard to answer. Just looking for general thoughts on it.

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  • Difference between a Deprecated and an Legacy API?

    - by Vaibhav Bajpai
    I was studying the legacy API's in the Java's Collection Framework and I learnt that classes such as Vector and HashTable have been superseded by ArrayList and HashMap. However still they are NOT deprecated, and deemed as legacy when essentially, deprecation is applied to software features that are superseded and should be avoided, so, I am not sure when is a API deemed legacy and when it is deprecated.

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  • Jaxws notifications

    - by akmer
    Hi, Could you please help in the following? Is there an acceptable design guideline to implement WS Notification Messaging in java? My scenario is the following: a web service client makes a web service call to a web service. After that, the web service should be able to send asynchronous notifications to the web client (as a result of the first web method call). What approach should be used? Thank you, Regards

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  • Strange eclipse error

    - by Gandalf StormCrow
    Has anyone expirience this error before: this happens when I hit CTRL + space , here is the error : For those who has tinyurl blocked: This compilation unit is not on the build path of the java project. This is a maven project, mvn eclipse:eclipse doesn't help I mean it compiles and runs just fine just something is wrong and I can't figure out what. I checkouted this project from SVN, it wasn't developed on my PC.

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