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• Is there a way to make eclipse report a general "catch (Exception e)" as an error/warning (in java)?

  - by Rog

  I'm trying to encourage a best practice of not catching general exceptions in Java code. eg: try { ... } catch (Exception e) { // bad! ... } Is there a way to flag this as an error/warning in Eclipse? I know PMD picks this up, but I'd rather avoid integrating it into everyone's build environment at the moment.

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• What is an instance in Java ? Confused between instance and object

  - by happysoul

  Are they same ? Came across this line when reading about Java's main method's signature "String args[ ] declares a parameter named args, which is an array of instances of the class String. Objects of type String store character strings."

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• How I can Optimize this mySQL transaction within java code?

  - by worldpython

  Dear All, I am new to MySql database. I've large table(ID,...). I select ID frequently with java code and.And that make a heavy load on transaction select from tableName where ID=someID notes: 1.Database could be 100,000 records 2.I can't cache result 3.ID is a primary key 4.I try to optimize time needed to return result from query. Any ideas for optimization ? thanks in advance

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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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• How to convert a scala.List to a java.util.List?

  - by Alex Baranosky

  I'm trying to use some Scala code and am having a hard time figuring out how to convert the Scala lists into standard Java lists. Any ideas?

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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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• How to design an exception logging table using HyperTable and access it via the Java client?

  - by ikevinjp

  If I have the following table schema to log an exception (in standard SQL schema): Table: ExceptionLog Columns: ID (Long), ExceptionClass (String), ExceptionMessage (String), Host (String), Port (Integer), HttpHeader (String), HttpPostBody (String), HttpMethod (String) How would I design the same thing in HyperTable (specifically, what is the best approach for efficiency)? And, how would I code it using the HyperTable Java client?

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• Best way to get the highest sum from a Matrix (using Java but algorithm is the issue here)

  - by user294896

  Sorry I dont know the correct terminology to use but I have a 3x3 matrix like this 1 3 4 5 4 5 2 2 5 and I want get the highest score by picking a value from each row/column but I cant pick the same row or column more than once , so the answer in this case is 3 + 5 + 5 = 13 (row0,col1 + row1,col0 + row2,col2) 4 + 5 + 5 = 14 is not allowed because would have picked two values from col2 I'm using Java, and typically the matrix would be 15 by 15 in size. Is there a name for what Im trying to do, and whats the algorithm thanks Paul

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• Why do contains()/indexOf() in a Java collections use o.equals(e) and not e.equals(o)?

  - by Fernando

  Why are the methods contains() and indexOf() in the Java collections framework defined using o.equals(e) and not e.equals(o) (where o is the argument of the methods and e is the element in the collection)? Anyone know the reasons of that?

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• How to enforce a 5-minute per post rule in a session object in Java?

  - by John

  I'm trying to figure out how to enforce a 5 minute per post/action rule. I'm developing a web application with Wicket in Java and I've got a session class which I was planning on using to keep track of these timers on a per-user basis. I wasn't planning on storing the timestamp in a database. public boolean isAllowedToPost() { if(null OR has 5 minutes passed since last post) { // set the new timestamp return true; } else { return false; } }

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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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• How do I make vim indent java annotations correctly?

  - by wds

  When indenting java code with annotations, vim insists on indenting like this: @Test public void ... I want the annotation to be in the same column as the method definition but I can't seem to find a way to tell vim to do that, except maybe using an indent expression but I'm not sure if I can use that together with regular cindent. edit: The filetype plugin was already turned on I just got a bit confused about indenting plugins. The accepted answer may be a bit hackish but works for me as well.

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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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• Where to use Inner Class in professional java developement life?

  - by abc

  Where to use Inner Class in professional java developement life? Please explain.. googling didn't wrk efficiently..

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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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• 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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