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• Vim plugin only works when file is provided as arg to launch command

  - by nsfyn55

  I am using the plugin java_getset.vim. The issue is that the plugin's commands are only available when I launch vim with the file as an argument. user@machine~: vim myfile.java If launch vim and use command-t or NerdTree to open the file in a buffer the plugin's commands are not accessible. All the filetype detection stuff is configured and working(I have syntax highlighting and indentation). The plugin source appears to be written to the letter according the the vim docs for a filetype plugin. Can anyone help me understand what changes a can make so that I can use this plugin in conjunction with Command-t?

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• How to edit files on the users file system from my web server?

  - by Abs

  Hello all, I am really looking for implementation advice as I have entered a new realm that I am not familiar with. At the simplest level, I would like to find a way that I can read/write to a users machine from my web server. For this to work, I think I will have to install some sort of "plugin" on the users machine which can receive (or poll?) the server for instructions. The above is the line of thought that I currently have, maybe using JAVA to do this. This needs to work on Linux, Mac and Windows OS. I am really looking for advice on the above, is it a good idea? Is there a better way of doing this? Is there something out there already that I can build on top of? I really appreciate all input and advice as this is something I have not done before. Thanks all

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• Template can not be resolved to a type

  - by chaoticca

  I have this code in an android project, which I am working on, where SomeService refers to SomeService.template. Intent intent = new Intent(getApplicationContext(), SomeService.class); bindService(intent, conn, 0); when I run my code, however, I become this error: "SomeService can not be resolved to a type. - Java Problem" This code was not written by me. I need it for farther use, but I can not even test, if it does, what it's supposed to be doing. Where should I look for an error?

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• Usage examples of binary search

  - by python dude

  I just realized that in my 4+ years of Java programming (mostly desktop apps) I never used the binary search methods in the Arrays class for anything practical. Not even once. Some reasons I can think of: 100% of the time you can get away with linear search, maps or something else that isn't binary search. The incoming data is almost never sorted, and making it sorted requires an extra sorting step. So I wonder if it's just me, or do a lot of people never use binary search? And what are some good, practical usage examples of binary search?

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• how do I repaint an applet while moving a sprite?

  - by Nagrom_17

  I have a little java applet where I create 2 threads, one thread repaints and the other moves an image from a point to where the user clicks. The problem is that when I call the move function it loops until the image is where the user clicks but it wont repaint until I break out of the loop even though the thread doing the moving and the thread doing the painting are separate. shortened version of key points: my program is an applet using the paint() method I have 2 threads one moves an image and the other paints that image when I am moving the image it is in a while loop the painting thread is still calling repaint() but that is as far as the call goes, it never repaints thank you for your time.

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• Create tables for a dictionary?

  - by heffaklump

  I'm making a dictionary database in SQLite and need some tips. My SQL is a bit rusty ;) Would you consider this good SQL? It's done with Java JDBC. This is for creating the tables. CREATE TABLE word ( id INTEGER, entry STRING, pos STRING ); CREATE TABLE translation ( word_id INTEGER REFERENCES word(id), entry STRING ); And when filling with data i give each word a number (id) and that words translations get the same number as word_id. What would be the best way of pulling out translations for a specific word?

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• JButtons don't imediatly change on mouse event

  - by out_sider

  I'm using the java swing library to develop a board game called DAO. The problem is that after the human player makes its move, by clicking on the JButton with the piece image that he wants to play, I call the computer AI routine but inside the mouse event function. By doing this only when the function returns, the computer ends its turn, do the JButtons refresh their Images (setIcon comes in). I'd like to know how can I force the JButtons to change their image at the moment they are clicked and not only when the mouse event function ends (as I need to handle data inside it). I've tried all of this myButtons[i][j].setIcon(xIcon); myButtons[i][j].revalidate(); myButtons[i][j].repaint(); myButtons[i][j].validate(); None worked. Thx in advance

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• Annotation retention policy: what real benefit is there in declaring `SOURCE` or `CLASS`?

  - by watery

  I know there are three retention policies for Java annotations: CLASS: Annotations are to be recorded in the class file by the compiler but need not be retained by the VM at run time. RUNTIME: Annotations are to be recorded in the class file by the compiler and retained by the VM at run time, so they may be read reflectively. SOURCE: Annotations are to be discarded by the compiler. And although I understand their usage scenarios, I don't get why it is such an important thing to specify the retention policy that retention policies exist at all. I mean, why aren't all the annotations just kept at runtime? Do they generate so much bytecode / occupy so much memory that stripping those undeclared as RUNTIME does make that much difference?

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• Sending compres data via socket

  - by Pizza

  Hi, I have to make a log server in java, and one task is to send the data compressed. Now I am sending it line by line in plain text, but I must compress it. The server handle "HTTP like" request. For example, I can get a log sending "GET xxx.log". This will entablish a TCP connection to the server, the server response with a header and the log, and close the connection. The client, reads line by line and analyzes each LOG entry. I tried some ways without success. My main problem is that I don't know where each line ends(in the client size). Any idea?

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• How to transfer large file (File size > Heap Size) over the network?

  - by neo

  How to transfer large file (File size Heap/RAM Size) over the network ? Lets say I have file (size 10GB) I want to transfer it machine a (RAM 512mb) to machine b (RAM 512mb). Want achieve this using java code. First, is it possible ? Any recommendation on framework. If possible, can we speed this up using threading ? Important criteria: file's data sequence needs to be maintained during transfer. Any example will be great help.

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• How to change the text int JLabel under the while or for loop?

  - by guilgamos

  I want to create a simple clock by using java. The code is very simply that i will give an example shown below for(int i=0;i<=60;i++) jLabel11.setText( Integer.toString(i) ); The problem is while I'm running my program the result didn't show the update in sequence. I mean it show only 60 digit immediately. It didn't show the change from 1 to 2 to 3 ... something like this. How can i fix this problem. Thank you in advance.

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• Interview Q: given an array of numbers, return array of products of all other numbers (no division)

  - by polygenelubricants

  I was asked this question in a job interview, and I'd like to know how others would solve it. I'm most comfortable with Java, but solutions in other languages are welcome. Given an array of numbers, nums, return an array of numbers products, where products[i] is the product of all nums[j], j != i. Input : [1, 2, 3, 4, 5] Output: [(2*3*4*5), (1*3*4*5), (1*2*4*5), (1*2*3*5), (1*2*3*4)] = [120, 60, 40, 30, 24] You must do this in O(N) without using division.

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• Any reason NOT to slap the 'synchronized' keyword everywhere?

  - by unknown

  In my java project, almost every non-static method I've written is synchronized. I've decided to fix up some code today, by removing most of the synchronized keywords. Right there I created several threading issues that took quite a while to fix, with no increase in performance. In the end I reverted everything. I don't see anyone else writing code with "synchronized" everywhere. So is there any reason I shouldn't have "synchronized" everywhere? What if I don't care too much about performance (ie. the method isn't called more than once every few seconds)?

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• What can we do to make XML processing faster?

  - by adpd

  We work on an internal corporate system that has a web front-end as one of its interfaces. The front-end (Java + Tomcat + Apache) communicates to the back-end (proprietary system written in a COBOL-like language) through SOAP web services. As a result, we pass large XML files back and forth. We believe that this architecture has a significant impact on performance due to the large overhead of XML transportation and parsing. Unfortunately, we are stuck with this architecture. How can we make this XML set-up more efficient? Any tips or techniques are greatly appreciated.

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• char '0x8' what character is this?

  - by OHHAI

  I have a large amount of data in a database. When I attempt to read a certain portion of the data and generate some xml and send it to a webservice I get the following exception... The char '0x8' in 'java.lang.IllegalArgumentException'. I'm guessing it is some bad data, as it has worked perfectly for about 7 months but now some user uploaded some new data that seems to have some issues. Anyone know what character this is so I can just run a sql query and clean it from the db? Thanks in advance.

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• Can I load lots of data only once and use it on each request?

  - by eikes

  Is there a way to load a big data object into the memory, which usually has to be loaded at each request, only once? In Java you can instantiate an object in a servlet when this servlet is loaded, but once it's there you can use it in any request. Example is below. Can this be done in PHP? public class SampleServlet extends HttpServlet { private static HugeGraphObject hgo; public void init() { hgo = HugeGraphObjectFactory.get(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String param = request.getParameter("q"); response.getWriter().write(hgo.getSomeThing(param)); } }

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• Looking for a way to highlight specific words in textareas?

  - by Dan

  Hi i'm looking for a way to highlight specific words in text kind of like how a text editor might work with syntax highlighting. The highlighting will consist of the text being different colours and/or different styles such as italic, bold or regular. In order to narrow focus, how this might be achieved using Java Swing components. There are most probably a number of ways of doing this but one that is efficient in dealing with multiple highlighted words and large amounts of text. Any feedback is appreciated. Thanks.

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• BufferedInputStream.read(byte[]) Causes problems. Anyone have this problem before?

  - by K-RAN

  Hello! I've written a Java program that downloads audio files for me and I'm using BufferedInputStream. The read() function works fine but is really slow so I've tried using the overloaded version using byte[]. For some reason, the audio becomes lossy and strange after download. I'm not totally sure what I'm doing wrong so any help is appreciated! Here's the simplified, sloppy version of the code. BufferedInputStream bin = new BufferedInputStream((new URL(url)).openConnection().getInputStream()); File file = new File(fileName); FileOutputStream fop = new FileOutputStream(file); int rd = bin.read(); while(rd != -1) { fop.write(rd); rd = bin.read(); }

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• Static referencing error

  - by maxflow

  public class HelloWorld { public static void main(String [] args) { char[] b = {'a', 'b', 'a', 'c'}; int p = 4; deleteRepeats(b, p); } public void deleteRepeats(char[] a, int size) { int currentElement; currentElement = 0; do { for (int i = currentElement; i < size-1; i++) { if (a[currentElement] == a[i+1]) a[i+1] = ' '; } currentElement++; } while (currentElement < size-1); } } I get the error: non-static method deleteRepeats(char[],int) cannot be referenced from a static context deleteRepeats(b,p); Can someone tell me what this means? I tried removing "static" from the main method, but I get the error: Exception in thread "main" java.lang.NoSuchMethodError: main. Thanks in advance

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• GregorianCalander

  - by namitjain23

  Hey guys, i know this is a very simple question but i am new to Java so please bare with me. I have create a program that can calculate the time a book is due to come back after being issed! So please help me out Here is the piece of code that i have: public void loan(int numOfDays) { if( onLoan == true) { System.out.println("Already on Loan, Return Date : "+Calendar.DATE ); } else { due.set( numOfDays, Calendar.DATE ); System.out.println("Available"); onLoan = true; } } // Mark the book as having been returned Basically i need to replace that Calendar.DATE to get me calculations right. I need to calculate the date passed by the TEST file and calulate the date it will be returned. This project needs to be submitted TOMORROW, so please please help me out!

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• sending request to a page

  - by gklots

  hi there. I'm trying to fill-out a form automatically and press a button on that form and wait for a response. How do I go about doing this? To be more particular, I have a a --HUGE-- collection DNA strains which I need to compare to each-other. Luckily, there's a website that does exactly what I need. Basically, I type-in 2 different sequences of DNA and click the "Align Sequences" button and get a result (the calculation of the score is not relevant). Is there a way to make a Java program that will automatically insert the input, "click" the button and read the response from this website? Thanks!

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• Shedule tasks question

  - by gabac

  Hi everyone I have a though question :) Let's say you get some data which is due at a certain point int the future. You get A saying my task is due in 1h and other which says his task is due in 1.5h. The information is collected on your server. In which programming language or even how would solve that? So task a will be executed in 1h, task B in 1.5h. I read something about java scheduler but I'm not yet sure if this is the right way. What are ur ideas? Cheers

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• problem with pageFetcher

  - by kate

  hello i use this code for(int i=0; i < citylink.length; i++){ body=pF.fetchpage(citylink[i][1]); //it's for taking the url from the table citylink and returns the source of this url!! i have also declare it in my pagefetcher.java class like this public String fetchPage(String url) { try { url = URIUtil.encodeQuery(url); } catch (URIException e) { // TODO Auto-generated catch block e.printStackTrace(); } but when i compile it it says that The method fetchpage(String) is undefined for the type PageFetcher and i can't run my problem!!! i don't know what to do

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• Is it possible to use a String as a seed for an instance Random? [duplicate]

  - by danpetruk

  This question already has an answer here: Converting String to long in Java 5 answers I have a String value and I would like to init a random class using the string as a seed? Is it possible to do this, and if so how? UPDATE 1: The string consists not only of ASCII. I can have any utf-8 symbols. UPDATE 2: Why did you close it? The questions really aren't about the same. Firstly because I've utf8 string and secondary because different strings can produce same seeds

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• What you would learn. [closed]

  - by NDeveloper

  Hi, I have a little free time and would like to learn new development language/technology. I know it can be very subective, but please share with us what you would learn and why. I have about 4 years of .NET development experience mostly distributed applications. And a little more than 2 years of c/c++. There are a lot of options to choose like Google Go/F#/Python/Scala/Java/ASP.NET/Mobile App development like for Android, BB, iPhone.../DB (MS SQL, Oracle or even MongoDB or CouchDB)/any new concepts, etc... I would like to use the time for investment, so gained knowledge will be useful.

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