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• Simple logger, how to ?

  - by Andrei Ciobanu

  Hello, I want to write a default Logger for my application. Currently I am using the default Java API Class Logger . I was wondering if it's possible to format my logs to look somthing like this: [level] [dd:MM:YYYY] [hh:mm:ss] message The logger should also be able to print the messages into the System.out and into a file ? Where should I look for this functionality ? Can you please give me some code snippets ?

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• Ternary operator in if-statement?

  - by Pindatjuh

  I've written the following if-statement in Java: if(methodName.equals("set" + this.name) || isBoolean() ? methodName.equals("is" + this.name) : methodName.equals("get" + this.name)) { ... } Is this a good practice to write such expressions in if, to separate state from condition? And can this expression be simplified?

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• How to pass a word macro a String parameter

  - by Holograham

  I would like to call a word macro from a java program and pass the macro a search string. Is there anyway to do this?

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• How to send PUT, DELETE HTTP request in HttpURLConnection ? Looks like not working.

  - by user128647

  I want to know if it is possible to send PUT, DELETE request (practically) through java.net.HttpURLConnection to HTTP-based URL. I have read so many articles describing that how to send GET, POST, TRACE, OPTIONS request but still not finding any sample code which successfully perform PUT and DELETE request. Can any one give idea regarding that?

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• Will this ever result in a stack overflow error?

  - by David

  Will incrementing the instance variables of an object ever lead to a stack overflow error? For example: This method (java) will cause a stack overflow error: class StackOverflow { public static void StackOverflow (int x) { System.out.println (x) ; StackOverflow(x+1) ; } public static void main (String[]arg) { StackOverflow (0) ; } but will this?: (..... is a gap that i've put in to shorten the code. its long enough as it is.) import java.util.*; class Dice { String name ; int x ; int[] sum ; .... public Dice (String name) { this.name = name ; this.x = 0 ; this.sum = new int[7] ; } .... public static void main (String[] arg) { Dice a1 = new Dice ("a1") ; for (int i = 0; i<6000000; i++) { a1.roll () ; printDice(a1) ; } } .... public void roll () { this.x = randNum(1, this.sum.length) ; this.sum[x] ++ ; } public static int randNum (int a, int b) { Random random = new Random() ; int c = (b-a) ; int randomNumber = ((random.nextInt(c)) + a) ; return randomNumber ; } public static void printDice (Dice Dice) { System.out.println (Dice.name) ; System.out.println ("value: "+Dice.x) ; printValues (Dice) ; } public static void printValues (Dice Dice) { for (int i = 0; i<Dice.sum.length; i++) System.out.println ("#of "+i+"'s: "+Dice.sum[i]) ; } } The above doesn't currently cause a stack overflow error but could i get it too if i changed this line in main: for (int i = 0; i<6000000; i++) so that instead of 6 million something sufficiently high were there?

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• Creating a Type object corresponding to a generic type

  - by Alexey Romanov

  In Java, how can I construct a Type object for Map<String, String>? System.out.println(Map<String, String>.class); doesn't compile. One workaround I can think of is private Map<String, String> dummy() { throw new Error(); } Type mapStringString = Class.forName("ThisClass").getMethod("dummy", null).getGenericReturnType(); Is this the correct way?

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• Disabling access to wsdl file in Axis Service Listing (listing services from wsdl's)

  - by aquitted-mind

  The listing of all deployed Services can be disabled by setting 'disableServiceList' to true in Axis; which is used in AxisServlet.java - reportAvailableServices() . However, is there a way to disable access to the wsdls ?

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• Android Calendar API vs Calendar Provider API

  - by John Roberts

  I'm a little bit confused about the difference between the two. An example of the Calendar API is supposedly located here: http://samples.google-api-java-client.googlecode.com/hg/calendar-android-sample/instructions.html, but the author himself suggests using the Calendar Provider API, details about which are here: http://developer.android.com/guide/topics/providers/calendar-provider.html. Can someone explain to me the difference between the two, and which would be better for me to use for a simple calendar app?

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• MySQL and SQLite differences in SQL

  - by Darth

  I'm writing java application that is using both SQLite and MySQL using JDBC. Are there any differences in SQL for those databases? Can I use same queries for both SQLite and MySQL, or is there any db specific stuff, that doesn't work on the other one? As far I've worked only with MySQL, so I don't really know much about SQLite.

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• How do you simulate a click on a JTextField? Equivalent of JButton doClick()?

  - by qwert302

  I am working on a Java project and need to have a keypress simulate a click on a JTextField. What I'm looking for is the equivalent of the JButton doClick() method. I am trying to have the keypress "enter" perform the exact same function as a click on the JTextField. Not sure what other info to provide. Thanks in advance.

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• How to get a random letter from a list of specific letters ?

  - by Ivan

  I've started writing some JAVA code and now I want to get a random letter from list of letters given so what should I use for this.

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• May I use com.google.code prefix for my packages?

  - by lbownik

  I have a hobby opne source Java project hosted at google code (linkset). May I use a prefix "com.google.code.linkset" as a package name for this project? P.S. I dont own "org.linkset" domain :( but i like the name :)

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• Update function

  - by kosmaks

  Hello everyone! I try to learn java for android devices.. i have to create the update function. But still have one question: How???? in class root public void update(){ maindebug("update"); // This is my debug function } public void run(){ while(isRunning){ // isRunning is a boolean variable SystemClock.sleep(100); update(); } } and inside onCreate run(); but it doesnt work :(

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• Memory Size Allocation on GPU - opengl texture loading question

  - by beyondsleepytime

  I'm loading pixels from an image which is 32 w by 32 height. The format I'm loading them in is ARGB via java. When I bind this to the video card, I can expect that the video card might use somewhere around 32*32*4 bytes, or 4K. Similarly, 1024 w, 1024 h would be 1024*1024*4 = 4MB. Is my understanding correct? Now I understand where all the memory goes!

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• Force a delay on Ajax responses when using the App Engine eclipse plugin?

  - by Joren

  I'd like to increase the time it takes the ajax to return in order to test various animations. By default it takes ~3-5ms. Is there a way to force a delay? I'm using java.

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• CompletionService.take().isDone() always true?

  - by jfager

  Is it safe to assume that java.util.concurrent.CompletionService.take().isDone() will always return true? If so, why does take() return a Future, rather than the value directly? If not, what does "completed task" as used in the documentation mean?

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• ThreadPoolExecutor fixed thread pool with custom behaviour

  - by Simone Margaritelli

  i'm new to this topic ... i'm using a ThreadPoolExecutor created with Executors.newFixedThreadPool( 10 ) and after the pool is full i'm starting to get a RejectedExecutionException . Is there a way to "force" the executor to put the new task in a "wait" status instead of rejecting it and starting it when the pool is freed ? Thanks Issue regarding this https://github.com/evilsocket/dsploit/issues/159 Line of code involved https://github.com/evilsocket/dsploit/blob/master/src/it/evilsocket/dsploit/net/NetworkDiscovery.java#L150

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• Swing UI does not have native OS look

  - by Virat Kadaru

  I am building an application in java swing and I am using the following code to give the UI a native OS look try { UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { e.printStackTrace(); } On a OS X, the look is fine, but on windows (XP and 7) the buttons look like this. I have used this exact same code on other projects and it works fine. But in this particular project I get a completely different look. Thanks in advance!

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• Does IBM Websphere 5.1.2 support jstl

  - by Suresh S

  Guys i have included jstl and standard.jar in lib directory under classpath. It says absolute uri http://java.sun.com/jstl is not found either in web.xml or in application. please let me know how to configure in websphere 5.1.2

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• Regex expression in plain english

  - by Sebi

  I'm working on a new Java project and therefore im reading the already existing code. On a very important part of the code if found the following regex expression and i can't really tell what they are doing. Anybody can explain in plain english what they do?? 1) [^,]*|.+(,).+ 2) (\()?\d+(?(1)\))

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• Scraping data from Flash (Games)

  - by awegawef

  I saw this video, and I am really curious how it was performed. Does anyone have any ideas? My intuition is that he scraped pixels from the screen (one per 'box'), and then fed that into some program to determine the next move. Is scraping pixel-by-pixel the way to do this, or is there a better way? I am looking to do something similar with either Java or Python. Thanks

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• Is it possible to create a DateFormatter which converts a two-digit year into a four-digit year?

  - by DR

  In my Java application I use a DateFormat instance to parse date inputs. DateFormat fmt; fmt = DateFormat.getDateInstance(DateFormat.DEFAULT) // dd.MM.yyyy for de_DE The problem is that the user insists to enter dates in the form 31.12.11. Unfortunately this is parsed to 31.12.11. (0011-12-31 in ISO format) Instead I want the parsed date to become 31.12.2011 (2011-12-31 in ISO format). Can I modify the date format to somehow parse inputs that way?

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• When you call remove(object o) on an arraylist, how does it compare objects?

  - by Thomas.Winsnes

  When you call remove(object o) on an arraylist in java, how does it compare the objects to find the correct one to remove? does it use the pointer? or does it compare the objects using the interface Comparable?

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• How to fetch parameters when using the Apache Commons CLI library

  - by Mridang Agarwalla

  I'm using the Apache Commons CLI to handle command line arguments in Java. I've figured out my way around it to a decent extent but I need a little help. I've declared the a and b options and I'm able to access the value using CommandLine.getOptionValue. Usage: myapp [OPTION] [DIRECTORY] Options: -a Option A -b Option B How do I declare and access the DIRECTORY variable? Thank you.

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• A good open source web crawler for indexing Specific website for specific contents?

  - by Peeyush

  Hello Please suggest me a good open source web crawler written in C++,JAVA or PHP. i just need to crawl/index some specific websites for specific contents(images,text,videos). i know that their are already a lot of question & answers about this topic on this website but i am a little confused after reading all of them. So i am sorry if i am repeating the same question again. -Thanks in advance

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