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• how to add a xml document to another xml document in java.

  - by Jagadesh

  I have a xml document like this rootXMLDoc=<root></root> . I need to insert paramxmlDoc= <parameter par='1'>abc</parameter>. how to insert paramxmlDoc to rootXMLDoc in java.?

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• Does anyone know of a good guide to configure GC in Java?

  - by evilpenguin

  I'm having trouble with a JVM running an app, whose heap memory looks like a comb. It's constantly jumping from 1.5 GB to 3 GB and slowly deteriorating to higher values. I'm using G1 GC algorithm, but have no idea how to configure it. I do not have access to the code of the app I'm running and, needless to say, it's a rather large app. So, bottom line, does anyone know of a good guide to configure GC in Java?

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• How to display html formatted text in text area of java application?

  - by Deepak

  I am scrapping data from web site using my java application and want to display the result after parsing code of html page in a Text Area made in Swing. Text like: hello <b>every</b>one should be displayed as: 'hello everyone' in text area. Thanks!!

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• Where can I find sample java questions for hands-on ? Not certifications type questions

  - by 29b5k

  Hi all, Most google results for sample questions/problems for java, results in a link directing to mock certification questions. Does anyone know where can i find sample problems for practice ? Thanks

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• Is it possible to instantiate a Java Annotation given a Class<? extends Annotation>?

  - by Steve

  I have a Class<? extends Annotation> and tried calling newInstance() but Java yelled at me for the obvious reason that I can't instantiate an interface. But I know frameworks like EasyMock are perfectly capable of instantiating interfaces. What would it take to get a completely dumb Annotation instance out of my Class?

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• How to pop items from a collection in Java?

  - by Tom Brito

  Is there a method in JDK or apache commons to "pop" a list of elements from a java.util.List? I mean, remove the list of elements and return it, like this method: public Collection pop(Collection elementsToPop, Collection elements) { Collection popped = new ArrayList(); for (Object object : elementsToPop) { if (elements.contains(object)) { elements.remove(object); popped.add(object); } } return popped; }

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• When do you use Java's @Override annotation and why?

  - by Alex B

  What are the best practices for using Java's @Override annotation and why? It seems like it would be overkill to mark every single overridden method with the @Override annotation. Are there certain programming situations that call for using the @Override and others that should never use the @Override?

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• Is Java worth learning in my late forties? [closed]

  - by bobi

  Hi guys. First I want to say is that I am 37 years old and not from programmer background (actually from biology). And my question is should I start learning Java? I have coded in PHP and JavaScript for a year and a half. Every answer would be appreciated. Thanks in advance Bobi.

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• How to learn .wav duration in Java media frame work?

  - by yaseemin

  Hi all, I am tyring to merge an .mov file with a .wav file using java media framework, thus I need to know their duration. How can I do this? Any ideas would be appreciated..

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• Java: Multi-dimensional array vs. One-dimensional.

  - by Mikolan

  For example: a) int [x][y][z] vs b) int[x*y*z] Initially thought i'd go with a) for simplicity I know that Java doesn't store arrays linearly in memory like C does. But what implications does this have for my program?

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• Which is the best java driver for mongodb access?

  - by Samuel

  I have no experience with MongoDB and we are trying to port a JPA application to be based on MongoDB. There are 3 drivers mentioned for porting java here. Which driver would be the easiest to use for converting my existing JPA application? Would it be morphia, mungbean or daybreak. Would prefer some practical experiences with users who have gone through this path before.

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• Is there a "best" or more popular database for standalone Java app?

  - by Tom Brito

  Is there a "best" or more popular database for standalone Java app? I'm currently writing by hand, but I would like to know what is commonly done, if there is something that is commonly done.

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• Is there a solution to parse wikipedia xml dump file in Java?

  - by Syed

  I am trying to parse this huge 25GB Plus wikipedia XML file. Any solution that will help would be appreciated. Preferably a solution in Java.

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• What is the corresponding WPF .NET component to a JTable in Java Swing?

  - by Jonas

  I have a small Java Swing application that I want to rewrite in WPF .NET. The application uses a JTable with an AbstractTableModel and a custom TableCellRenderer. I use my custom cell renderer to display the objects in two rows. What is the corresponding WPF .NET component to JTable?

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• in java what is the syntax for commenting out multiple lines?

  - by David

  in java what is the syntax for commenting out multiple lines? i want to do something like: (comment) LINES I WANT COMMENTED LINES I WANT COMMENTED LINES I WANT COMMENTED (/comment)

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• How would you convert a String to a Java string literal?

  - by Simon Nickerson

  This is sort of the Java analogue of this question about C#. Suppose I have a String object which I want to represent in code and I want to produce a string literal that maps to the same thing. I was just about to write a state machine that ingests the string character by character and escapes appropriately, but then I wondered if there was a better way, or a library that provides a function to do this.

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• I'm trying to simulate a directly mapped cache in java. Any ideas on which data structure to use to

  - by bananamana

  I'm trying to simulate a directly mapped cache in java. Any ideas on which data structure to use to represent the cache?

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• I need a Java code that takes tab delimited info from a file to a displayed table and updates the fi

  - by Rin

  I need a Java code that takes tab delimited info from a file to a displayed table. The user should be able to click a row and update it, this is followed by updating the file. The code should use Swing objects.

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• Java Servlets - How do I detect if a user is from a mobile device?

  - by Spines

  Java Servlets - How do I detect if a user is from a mobile device? I'm using the TinyMCE javascript editor, and it doesn't work on the iphone. How can I detect if the user is coming from a mobile device?

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• How do I increment a variable to the next or previous letter in the alphabet in Java?

  - by raleighJ

  I'm relatively new to Java coding, and was looking for some help. I have a capital letter defined in a variable string, and I want to output the next and previous letters in the alphabet. For example, if the variable was equal to C, I would want to output B and D. Thanks in advance for any help.

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• Can anyone provide Java program for btree or b+tree???

  - by rohit

  Hi, I am doing a project in which i require btree or b+tree data structure. but its not an important part of project. it would take my time to write a code for it. I googled it but didn't get anything.... So, can anyone provide java code for btree or b+tree implementation (with insert, delete, search algorithms)?????? it should accept string as input and form btree or b+tree of these string.

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• Does the for foreach construct in java create a hard or soft copy?

  - by Doug

  Say I have the following piece of java code ArrayList<Double> myList = new Double[100]; for (Double x : myList) x = randomDouble(); Does this actually modify myList or just the dummy variable? I realize I should just try this code segment out, but I think this is the sort of thing I should be able to google or search for on this site, and several queries so far have turned up nothing useful.

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• How and where do you define your own Exception hierarchy in Java?

  - by EugeneP

  How and where do you define your own Exception hierarchy in Java? My main question concerns package location where they your Exception classes must be defined. Do we create a special package ourexceptions and put all classes inside it?

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• How to do method chaining in Java? o.m1().m2().m3().m4()

  - by Pentium10

  Maybe the title might be better, if someone knows a better one, please edit. I've seen in many Java code notation that after a method we call another, here is an example. Toast.makeText(text).setGravity(Gravity.TOP, 0, 0).setView(layout).show(); As you see after calling makeText on the return we call setGravity and so far. How can I do this with my own classes? Do I have to do anything special?

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• Tool for converting subset of PHP code into Java/Scala/Groovy?

  - by Alex R

  Do any exist? Ideally it would also come with a library of basic PHP functions. I have a bunch of simple PHP scripts (no extensions, no fancy dynamic hacks, etc) I'd like to convert to Java... It would be great if a tool could do 80% of the work while I do the other 20%.

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