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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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• 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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• 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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• How can I get the text color of a button using the Substance LaF?

  - by DR

  In my Java application I have to custom-paint a control and for that I need to use the same font colors as JButton. (Enabled an disabled) I don't want to to hard-code them, because the user can change the Substance skin at runtime. I'm aware of the ColorSchemes but I'm not sure how to proceed once I have the color scheme of the current skin. Also the Substance documentation says something about creating your own color scheme, but I just can't figure out the way to retrieve a certain color.

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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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• 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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• Error: Current Displayable is an Alert

  - by hsmit

  I get the following error: Illegal Argument java/lang/IllegalArgumentException Current Displayable is an Alert I'm not sure what is means and why this exception is fired.

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• How to create Binary Tree in a image(.jpeg)

  - by abc

  I have data structured in Binary tree format, i want to represent it into an image(*. jpeg) then i need to display that image on web page and all the data will come @ runtime, so image processing should be done @ runtime, how to do this ? This is what my thought solution any other suitable solution are also welcomed, web site is in .NET , i am thinking to produce image using java api then integrate it to .NET wither through WEB-SERVICE call or any other solutions are also welcomed.

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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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• DAO method retrieve single entry

  - by London

  Hello, How can I write DAO method which will return as a result only first entry from the database. For instance lets say I'm looking at Users table and I want to retrieve only the first entry, I'd declare method like: public User getFirstUser(){ //method logic } EDIT: User has primary key id if that matters at all. I apologize if this question is too simple/stupid/whatever I'm beginner with Java so I'm trying new things. thank you

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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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• Varying behavior for possible loss of precision

  - by szupie

  In Java, when you do int b; b = b + 1.0; You get a possible loss of precision error. But why is it that if you do int b; b += 1.0; There isn't any error?

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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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• 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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• What's your idea about transcript? Is it important?

  - by Mike Redford

  hi everyone I want to go the university for computer science faculty(java),what's your idea about this : Do you consider your transcript(s) of university-level work an accurate indication of your academic ability? Thanks a lot ...

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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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• Why don't Generics support primitive types?

  - by RayAllen

  Why Generics (in Java) works with the objects but not with primitive types? For example Gen<Integer> inum = new Gen<Integer>(100); // works fine, but Gen<int> inums = new Gen<int>(100); // is not allowed. Thanks !

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• How does JVM handles dynamic allocation

  - by Nile

  I want to understand how JVM manages heap for the dynamic allocations. Since every java program is invoked as a thread, when does JVM's garbage collector come into play. Also, how things work for javascript's dynamic allocation ?

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• How to change the cursor blink color?

  - by Nitz

  I don't know this is possible or not? But i want to change the this cursor blink color...which is normally black.... i am making one java-swing based project and in that...one of the requirement is to change the color of the cursor blink.... Is this possible?

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• JBoss AS 5 "Failed to add Resource"

  - by Mark

  Hello - We are stumped and looking for advice.. Were running: jdk1.6.0_20 , jboss-5.1.0.GA, messaging-2.0.0.BETA4 And trying to add a Topic or Queue but we are getting this error: Failed to add Resource: java.lang.IllegalStateException:Failed to find template for: TopicTemplate any advice?

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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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• Projects with browsable source using dependency injection w/ guice?

  - by André

  I often read about dependency injection and I did research on google and I understand in theory what it can do and how it works, but I'd like to see an actual code base using it (Java/guice would be preferred). Can anyone point me to an open source project, where I can see, how it's really used? I think browsing the code and seeing the whole setup shows me more than the ususal snippets in the introduction articles you find around the web. Thanks in advance!

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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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• Remember the values entered on standalone app on the client side

  - by kshtjsnghl

  We have a standalone java swing app, in which the user can print something that he drew, on a printer by giving its IP. Now the requirement is that the app needs to remember the ip that was given the last time by this user. What I could think of till now is (a brute one though) - keep a log file kind of storage on the client machine, and that everytime the app comes up it reads the last submitted one. Any suggestions would be helpful. Thanks in advance.

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• Removing all items of a given value from a hashmap

  - by Anthony Webb

  So I have a java hashmap like below: hMap.put("1", "One"); hMap.put("2", "Two"); hMap.put("3", "Two"); I would like to remove ALL items where the value is "Two" If I do something like: hmap.values().remove("Two"); Only the first one is deleted, I want to remove them all, how can this be done?

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