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• In java, is there any disadvantage to static methods on a class?

  - by Michael Campbell

  Lets assume that a rule (or rule of thumb, anyway), has been imposed in my coding environment that any method on a class that doesn't use, modify, or otherwise need any instance variables to do its work, be made static. Is there any inherent compile time, runtime, or any other disadvantage to doing this?

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• What is the size of boolean variable in java?

  - by shangrila

  boolean variable have only two specified values ,"true" or "false" How does it stored in VM? Hmm...This is my first question here.Thank you all for answering me. :)

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• Is it expensive to hold on to PreparedStatements? (Java & JDBC)

  - by sbook

  I'm trying to figure out if it's efficient for me to cache all of my statements when I create my database connection or if I should only create those that are most used and create the others if/when they're needed.. It seems foolish to create all of the statements in all of the client threads. Any feedback would be greatly appreciated.

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• How to index pdf, ppt, xl files in lucene (java based or python or php any of these is fine)?

  - by harsha

  Also I want to know how to add meta data while indexing so that i can boost some parameters

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• The role of data types inside of the < > in declarations in Java?

  - by Emanuil

  To give an example, whats the role of the <String> in the following line of code? private List<String> item = new ArrayList<String>();

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• What's the limit of BONITA Platform ? Can a Business Analyst generate a whole Java Web App with just

  - by asksuperuser

  I'm studying some systems that allow faster App dev cycles. So I stumbled upon BONITA. It seems that by preparing some connectors you can allow a Business to generate a whole App. What's the limit of Bonita and what is needed to improve it ?

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• Java vs .net, which is the best platform for my career?

  - by Ayyappan.Anbalagan

  I really confused with this discussion. My team members told that,In future peoples are not going to use .net. Reason: .net not support all platform.

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• What are the key steps to develop a java software?

  - by iownfloppydisk

  i.e. you must know the basic programming construction , data structures or whatever because i don't know the pattern how people use to make a big application or where do they start.

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• Java: Anyone know of a library that detects the quality of an internet connection?

  - by Zombies

  I know a simple URLConnection to google can detect if I am connected to the internet, after all I am confident that the internet is all well and fine If I cant connect to google. But what I am looking for at this juncture is a library that can measure how effective my connection to the internet is in terms of BOTH responsiveness and bandwidth available. BUT, I do not want to measure how much bandwidth is potentially available as that is too resource intensive. I really just need to be able to test wether or not I can recieve something like X kB's in Y amount of time. Does such a library already exist?

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• How to get string name of a method in java?

  - by drozzy

  How can I find out through reflection what is the string name of the method? For example given: class Car{ public void getFoo(){ } } I want to get the string "getFoo", something like the following: Car.getFoo.toString() == "getFoo" // TRUE

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• How can I get relative path of the folders in my project? (java)

  - by masterkapu

  How can I get the relative path of the folders in my project (using code)? I created new folder in my project and I want its relative path so no matter where is the app the path will be correct. Maybe this can be useful: I trying to do it not inside any function just inside the class and I want to init with it a final variable. the app is android and the class is "extends Activity" thanks

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• What JVM language + web framework do you use with Google Appengine Java?

  - by Langali

  Looking for the least bumpy (and most productive ) ride for a web 2.0 idea... Groovy/Grails, Scala/Lift, Groovy/Gaelyk, OR.... Please share your experience.

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• Java: Is it possible to take a GUI Panel and output it into a picture?

  - by user369748

  So I have this chart that's a little special. Kind of like an XY plot of points but my boss wanted to look like a bunch of boxes rather than dots connected by lines. And I basically made a chart using gridlayout and a whole bunch of cells that I'll be colouring in black or white depending on the data. Now he sorta wants it to be outputted to a image file. Is there any way to save a Panel into a picture? He wants to display not only the data but also save a visual representation of the data into an image file.

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• How to identify/handle text file newlines in Java?

  - by rafrafUk

  Hi Everyone! I get files in different formats coming from different systems that I need to import into our database. Part of the import process it to check the line length to make sure the format is correct. We seem to be having issues with files coming from UNIX systems where one character is added. I suspect this is due to the return carriage being encoded differently on UNIX and windows platform. Is there a way to detect on which file system a file was created, other than checking the last character on the line? Or maybe a way of reading the files as text and not binary which I suspect is the issue? Thanks Guys !

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• How can I tell what is using the memory when there is a heap overflow in Java?

  - by Grae

  Hi all, I know a little about profiling, but what I am particularlly insterest in, is what has all the memory when I get these heap over flow exceptions. I will start getting them after about a hour of debugging. I am hoping there is some sort of dump or something, that I can use to get a list of what instances are around at the time the program starts. By the way, sorry if this is a lazy question. I really shoud put sometime in learning about profiling. Grae

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• Java - Can i have a faster performance for this loop ?

  - by Brad

  I am reading a book and deleting a number of words from it. My problem is that the process takes long time, and i want to make its performance better(Less time), example : Vector<String> pages = new Vector<String>(); // Contains about 1500 page, each page has about 1000 words. Vector<String> wordsToDelete = new Vector<String>(); // Contains about 50000 words. for( String page: pages ) { String pageInLowCase = page.toLowerCase(); for( String wordToDelete: wordsToDelete ) { if( pageInLowCase.contains( wordToDelete ) ) page = page.replaceAll( "(?i)\\b" + wordToDelete + "\\b" , "" ); } // Do some staff with the final page that does not take much time. } This code takes around 3 minutes to execute. If i skipped the loop of replaceAll(...) i can save more than 2 minutes. So is there a way to do the same loop with a faster performance ?

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• Java-Hibernate-Newbie: How do I acces the values from this list?

  - by Mes

  I have this class mapped @Entity @Table(name = "USERS") public class User { private long id; private String userName; } and I make a query: Query query = session.createQuery("select id, userName, count(userName) from User order by count(userName) desc"); return query.list(); How can I acces the value returned by the query?

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• Java SQL (h2): What's the best way to retrieve the unique ID of the single item I just inserted into

  - by Daddy Warbox

  My current method is this: SELECT TOP 1 ID FROM DATAENTRY ORDER BY ID DESC This assumes the latest inserted item always has the highest unique ID (primary key, autoincrementing). Something smells wrong here. Alternatives?

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• Java. Sax parser. How to manually break parsing?

  - by Andrey Khataev

  Hello! Tell me please is it possible to break the process of parsing? I.e. exit this loop not reaching the end of document and corresponding event "endDocument" ?

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• Is it possible to run FindBugs against only one Java class?

  - by rmcc

  I use the FindBugs Eclipse plug-in and was wondering if I can simply analyze only one class rather than the entire project? I can't seem to figure it out. Simply right-clicking on the target class doesn't seem to do anything.

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• playing wav file in java - how do I extend or concatenate the sound played?

  - by Tim

  Is it possible to create a temporary file that contains a "loop" of a wav file? Or is it possible to manipulate the stream sent to a stream reader/writer? Basically I want to play some wav file for a period of time and if that time is greater than the length of time that the wav file provides I want to loop.

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• App Engine - Java AppStats - It shows all requests as cpu time of 0.

  - by Spines

  All lines in my AppStats look like this: real=19ms cpu=0ms api=0ms overhead=0ms, it has the correct real time, but the other values are always 0. Anyone have this problem before or know how to fix this?

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• How do you store and retrieve data from a text file in Java/Android?

  - by Emanuil

  The question is in the title.

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• Java generic function for performing calculations on integer, on double?

  - by Daniel

  Is this possible? Surely if you passed in a double, any sort of function implementation code which casts an object to an Integer would not be able to work unless the cast 'Integer' was specifically used? I have a function like: public static void increment(Object o){ Integer one = (Integer)o; system.out.println(one++); } I cant see how this could be made generic for a double? I tried public static <E> void increment(E obj){ E one = (E)o; system.out.println(one++); } but it didn't like it?

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• Trying to use a list iterator to print out entire linked list in Java. Infinite loop for some reaso

  - by Matt

  I created my list: private static List list = new LinkedList(); and my iterator: ListIterator itr = list.listIterator(); and use this code to try to print out the list... Only problem is, it never comes out of the loop. When it reaches the tail, shouldn't it come out of the loop, because there is no next? Or is it going back to the head like a circular linked list? It is printing so quickly and my computer locks up shortly after, so I can't really tell what is going on. while (itr.hasNext()) System.out.println(itr.next());

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