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• How to switch data pins on/off on parallel port?

  - by Matt

  I want to simply switch certain data pins on and off, so that they can control a set of relays. I'm not asking about the hardware bit (should be easy), but I don't know where to begin writing the software. I don't want a high level library that can send bytes to a device - I literally want to switch on/off certain pins. I'm running Linux and I want to do this in Java, so would I just need a library? It would be nice if the library has good documentation and is easy to use, but if not then a short example code will help me get started.

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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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• 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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• 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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• Should I create a new window or modify the old one?

  - by Roman

  I am programming a GUI application in Java. I do it for the first time. I would like to have a form (with radio buttons and so on). After the form is filled in and the "Submit" button is pressed I would like to have a new window. I see two potential ways to do it: Close the "old" window and open a "new" one. Remove "old" elements from the existing window and put there "new" elements. What is the standard way to go? If it is the first way, what is the command to close the window? If it is the second one, how can I remove elements from the existing window?

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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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• 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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• 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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• In a JDBC ResultSet, what should happen when getLong() or getShort() is called on an int result colu

  - by Uri

  Say that I have a JDBC ResultSet, and I call the getLong() or getshort() method. For which of the following SQL types {SMALLINT, INT, BIGINT} should I get long, and for which types should I get an error? In other words, if I have an INT and I want a SMALLINT (A short), would I get it, or would I get an error? Similarly, if I have an INT and want a BIGINT (a long), would I get it, or would I get an error? The Javadocs (listed below) say nothing. public long getLong(int columnIndex) throws SQLException Retrieves the value of the designated column in the current row of this ResultSet object as a long in the Java programming language. Parameters: columnIndex - the first column is 1, the second is 2, ... Returns: the column value; if the value is SQL NULL, the value returned is 0 Throws: SQLException - if a database access error occurs

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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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• convert object to in

  - by hoora

  hello! i'm beginner and i want to write a java code in eclipse! this program take two linkedlist of integers(for exp:a & b) and make a linkedlist (for exp:d) that every elements of it are summation of elements of that linkedlist! but i can't add this two element of linkedlist because these are Object!! please help me!! exp: a=[3,4,6,7,8] b=[4,3,7,5,3,2,1] d=[7,7,13,12,11,2,1] THANK YOU VERY VERY VERY MUCH!

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• Android camera to take multiple photos

  - by user2975407

  problem.java public class problem extends Activity { ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.problem); iv=(ImageView) findViewById(R.id.imageView1); Button b=(Button) findViewById(R.id.button1); b.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, 0); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); Bitmap bm=(Bitmap) data.getExtras().get("data"); iv.setImageBitmap(bm); } } From this code I can only take one photo and it displayed in the screen. **But I want to take more photos nearly 5 photos and display in the screen** Further I want to add these photos to MySQL database.please help me to do that.I am new to android

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• @MustOverride annotation?

  - by Harrypotter2k5

  In .NET, one can specify a "mustoverride" attribute to a method in a particular superclass to ensure that subclasses override that particular method. I was wondering whether anybody has a custom java annotation that could achieve the same effect. Essentially what i want is to push for subclasses to override a method in a superclass that itself has some logic that must be run-through. I dont want to use abstract methods or interfaces, because i want some common functionality to be run in the super method, but more-or-less produce a compiler warning/error denoting that derivative classes should override a given method.

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• Deleting the first occurrence of a target in aList [closed]

  - by Bandz Jooz

  /** Replaces each occurrence of oldItem in aList with newItem */ public static void replace(List<Student> aList, Student oldItemStudent newItem) { int index = aList.indexOf(oldItem); while(index != -1){ aList.set(index, newItem); index = aList.indexOf(oldItem); } /** Deletes the first occurrence of target in aList */ public static void delete(List<Student> aList, Student target){ Object o = //stuck here, dont know how to set up boolean stuff } } I figured out how to do the first method by looking up Java documentation, however I can't figure out how to finish my code for the second method even though I looked up the documentation which states: boolean remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.

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• What language should I write my 2D game in? [closed]

  - by jmgrosen

  I'm thinking of writing a game. It's inspired by Minecraft/Terraria (but don't worry it will be different). My main question is what language I should write it in -- it'll be relatively simple graphics, more like Terraria than Minecraft. I know Java relatively well and Minecraft is written in it, but C++ seems like the industry standard for game development. However, I know next to no C++. I'm willing to learn but am worried how it will turn out for my first real project in the language. In addition to that, I'd also like suggestions on a good game engine for the language that you suggest. I'd like it to run on: Windows for sure Linux for sure Mac for sure Android would be really nice iOS is optional Thank you in advance!

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• home page of my site is not appear in google search, when I type site:mario--games.com

  - by Bimal Das

  I am totally confused, when I place site:mario--games.com in google I see every page of my website in serp(search engine result page) except the home page. I don’t know why it’s happening but I check everything according to google SEO rule. But not getting success.I try to check my site through google webmaster tool everything is perfect there, Please help me to solve this. htaccess rule of my site RewriteEngine on #RewriteBase / #RewriteCond %{HTTP_REFERER} !^$ #RewriteCond %{HTTP_REFERER} !^http://(www\.)?jocuri-barbie.ro/.*$ [NC] #RewriteCond %{HTTP_REFERER} !^http://(www\.)?joc-jocuri-barbie.ro/.*$ [NC] #RewriteRule \.(gif|jpg|swf|flv|png)$ / [F] RewriteCond %{HTTP_HOST} ^sitename\.com$ RewriteRule ^(.*)$ http://www.sitename.com/$1 [R=301,L] RewriteRule ^privacy_policy.html$ privacy.php RewriteRule ^contact_us.html$ contact.php #RewriteCond %{HTTP_HOST} !^sitename.com$ #RewriteRule ^(.*)$ http://sitename.com/$1 [L,QSA,R=301] RewriteRule ^index\.php$ / [QSA,R=301] RewriteRule ^([A-Za-z0-9_]+)_([0-9]+).html$ articol.php?id=$2 RewriteRule ^([a-z_]+).html$ categorii.php?abbr=$1 RewriteRule ^([A-Za-z0-9+]+)$ search.php?cuvinte=$1 RewriteRule ^images/$ images [F] RewriteRule ^o_articole/$ o_articole [F]

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• Wifi connection frequently dropping in hotspots and university campus, home Wifi works fine.

  - by Olivier Lalonde

  For some reason, my Wifi connection frequently drops everywhere except at home. I didn't have this problem with Windows 7 so I guess it's not a hardware problem. My best guess so far is that my connection timeout is very low so if my connection isn't able to reach the router after a few second, the connection drops. Is that likely to be the problem? If so, how could I fix this? Otherwise, what would be an alternative cause for this strange behavior?

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• home page of my site is not appear in google search, when I type site:example.com

  - by Bimal Das

  I am totally confused, when I place site:example.com in google I see every page of my website in serp(search engine result page) except the home page. I don’t know why it’s happening but I check everything according to google SEO rule. But not getting success.I try to check my site through google webmaster tool everything is perfect there, Please help me to solve this. htaccess rule of my site RewriteEngine on #RewriteBase / #RewriteCond %{HTTP_REFERER} !^$ #RewriteCond %{HTTP_REFERER} !^http://(www\.)?example.ro/.*$ [NC] #RewriteCond %{HTTP_REFERER} !^http://(www\.)?exa-example.ro/.*$ [NC] #RewriteRule \.(gif|jpg|swf|flv|png)$ / [F] RewriteCond %{HTTP_HOST} ^sitename\.com$ RewriteRule ^(.*)$ http://www.sitename.com/$1 [R=301,L] RewriteRule ^privacy_policy.html$ privacy.php RewriteRule ^contact_us.html$ contact.php #RewriteCond %{HTTP_HOST} !^sitename.com$ #RewriteRule ^(.*)$ http://sitename.com/$1 [L,QSA,R=301] RewriteRule ^index\.php$ / [QSA,R=301] RewriteRule ^([A-Za-z0-9_]+)_([0-9]+).html$ articol.php?id=$2 RewriteRule ^([a-z_]+).html$ categorii.php?abbr=$1 RewriteRule ^([A-Za-z0-9+]+)$ search.php?cuvinte=$1 RewriteRule ^images/$ images [F] RewriteRule ^o_articole/$ o_articole [F]

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• Commandline shortcut for current directory similar to ~ for home directory?

  - by NES

  When i use the cp or move command in a terminal window, i'm currently with bash in a certain folder like this. NES@server:~/Desktop/dir1$ And now i wanna copy a file from here ~/anotherdir/dir2 into the current chosen folder in bash (dir1) i would use the command cp ~/anotherdir/dir2/file ~/Desktop/dir1 does a shortcut string exist to refer to the current chosen directory? So that in this example i don't have to provide the full path to the target dir, but the command knows it should use the current chosen directory in bash? i.e. as ~ stands for the home directory?

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• What tools are available for remote communication when working from home or with a distributed team?

  - by Ryan Hayes

  My supervisor is allowing my team to dip our toes in the water of working from home. Considering a recent aquisition of another company is requiring some employees to love this new idea which will hack up to an hour off their commute into work every morning, I really want this to succeed. In order to make it a success, we need good tools to make our lives a lot easier. We currently are set up with OpenVPN, and Team Foundation Server 2010 with SharePoint 2010, and use Live Messenger (for SharePoint integration and easier remote desktop) for IM. These are just what we use (and they are currently working well) , but you can suggest other products. So, what are some great tools that will helps us collaborate, communicate, and generally work together when we're hours apart?

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• Own an iPad, iPhone, or Touch? Add GWB to your Home

  - by Staff of Geeks

  I know it is goofy to geek out about such things, but I am a pretty goofy geek.  Today we published support for the Apple icons for devices like the iPhone, iPad, or iPod Touch.  Now when you add Geekswithblogs.net to your home screen (via the little + in Safari) it will load the icon to the left instead of a screenshot of the site.  We have been using my iPhone and iPad to surf to GWB for awhile and we were tired of that screenshot.  Simple Google/Bing search and a little Photoshop CS5 (Amazing!!!) work and there it is.  Next step we are taking in the Apple iPad/Phone arena is getting our developer kit and seeing what possiblities there are for Geekswithblogs.net and a custom App.  Got any ideas? Here is a shot of my iPad 3G: Also, would anyone be interested in a Geekswithblogs.net custom background for the iPhone or iPad?  I can put something together real quick if there are any takers.

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• How do I set up hosting a domain name at home with Apache?

  - by Andrew McIntyre

  I am relatively new to Ubuntu Linux and I am struggling to figure out the basic set-up of hosting a domain name at home with Apache2. I understand that you have to change your IP from dynamic to a static IP Address but I am not sure how you achieve that step. I am looking for some assistance on this on how to enable self signing certificates, make the domain name resolve on the Internet from hosting the website on the web server, enabling protected directories and the basic commands of accessing the directory where the website files can be uploaded and available on the World Wide Web.

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• How do I get rid of duplicates in Rhythmbox even though the music in my Home folder is not showing duplicates?

  - by Drake

  I clicked import within Rhythmbox in Ubuntu 12.04 so I could get music to Ubuntu from my windows partition. The music appeared in my Rhythmbox library and I started playing it. However, when I restarted my computer the imported music did not show up. I looked in my music library and it was completely empty. So, I copied all of my music from my Windows partition into my music folder and launched Rhythmbox, but now it shows duplicates of all of the music I have. How can I get rid of the duplicate files if they are not showing in my Home folder?

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• How do I configure my 2 RAID drives so I can use it as /home?

  - by Kenn

  I've installed Ubuntu 11 64-bit to a 2 TB drive. it is on /dev/sda - port 1 of SATA Host Adaptor. This contains /dev/sda1 (1 MB boot), /dev/sda2 (2TB EXT4), /dev/sda3 8.6GB SWAP. I also have: /dev/sdb 2TB RAID COMPONENT /dev/sdc 2TB RAID COMPONENT which also show as /dev/dm-0 not partitioned /dev/dm-2 not partitioned which is mounted as /media/RAID_HOME I'm completely stumped as to how to use this version of Ubuntu to make these drives seem as just one raid mirrored drive and then how to transfer /home onto it.

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• How Does Your Home Based Business Rank? Unlock the Mystery of Search Engine Optimization

  For many, the words "search engine optimization" (SEO) are simply confusing buzz words used by tech heads buried in the mysterious world of internet marketing. But listen up home based business owners, SEO can be a critical component of your marketing strategy, and when broken down to its basic level, SEO is merely a tool allowing you to use the various search engines such as Google or Yahoo! and others to gain visibility for your business and drive prospects to your website. SEO marketing is the process of improving the volume of traffic to a website through natural/organic (un-paid) search results. Unlike promoting your business via pay-per-click (PPC) strategies, which lists your business at the top of search engines such as Google or Yahoo! for a fee, SEO is a strategy with the goal of ensuring placement at the top without incurring expensive placement costs.

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