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• How can two instances of an application communicate in Java?

  - by shubhkarman

  Hello, I am developing a new Java Desktop app. Something like a media player. I want to load most of the resources in the background when the computer starts up. But the users can turn this option off form within the app or using some other utility. So, what I want to do is if a ban instance of the app is already running and the user starts the app again then I can communicate with the already running instance so that it can launch a new window?

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• When and how are classes garbage collected in Java?

  - by Bright010957

  I asked a question about Garbage Collection in Java in this topic. But the answer I got, gave me another question. Someone mentioned that classes can be collected by the garbage collector too. Is this true? And if it is true, how does this work?

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• Is Java worth learning in my late thirties? [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 send mail from any mail id through java?

  - by abc

  How to send mail from any mail id through java? i meant how can we set from : address in mail any that we want.

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• What's the best building tool for java besides ant?

  - by user198729

  Somehow I don't like IDE very much, but I don't find a particular good tool to build java applications from source yet. I welcome all kinds of feedbacks!

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• How do I express ":" but not preceded by "\" in a Java regular expression?

  - by jjujuma

  How can I express "not preceded by" in a Java regular expression? For example I would like to search for ":" but only when it is not directly preceded by "\". How can I do this?

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• How does Java order items in a HashMap or a HashTable?

  - by ComputerJy

  I was wondering how Java sorts items in the Map (HashMap or Hashtable) when they are added. Are the keys sorted by the hashcode, memory reference or by allocation precedence...? It's because I've noticed same pairs in the Map are not always sorted in the same order

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• Can python code (say if I used djangno) be obfuscated to the same 'level' as c#/java?

  - by Blankman

  If I obfuscated python code, would it provide the same level of 'security' as c#/java obfuscating? i.e it makes things a little hard, but really you can still reverse engineer if you really wanted to, its just a bit cryptic.

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• Is this possible to make as a option dialog in Java?

  - by Raptrex

  I'm wondering how I could make this into a popup dialog. I designed this with Netbeans gui editor. I looked at option dialog, but all the examples only had a textfield or a combobox, not more than one thing like I have. So what would be the best way to make this in Java.

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• Why do we make a copy of final instance variable in a method in Java?

  - by PRK

  For instance: private final Object o; public void doSomething(){ final Object local = this.o; //access methods of local; } This practice is followed in lots of java classes (such as ArrayBlockingQueue). What's the benefit of this?

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• How can I call notify() in Java without blocking?

  - by Horcrux7

  Are there a replacement for the follow Java code that will not block? I want only ping a possible waiting thread. I does not want change any on a possible thread that is already in the monitor. synchronized( monitor ) { monitor.notify(); }

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• What is the equivalent of Java's final in C#?

  - by Nosrama

  What is the equivalent of Java's final in C#? EDIT: Sorry, I should have been clearer. I meant what is the equivalent when applied to a member variable - so it must be assigned once and only once.

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• How to check if internet connection is present in java?

  - by Chris

  How do you check if you can connect to the internet via java? One way would be: final URL url = new URL("http://www.google.com"); final URLConnection conn = url.openConnection(); ... if we got here, we should have net ... But is there something more appropriate to perform that task, especially if you need to do consecutive checks very often and a loss of internet connection is highly probable?

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• $0 (Program Name) in Java? Discover main class?

  - by RyanTM

  Is there a way to find the name of the program that is running in Java? The class of the main method would be good enough.

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• Java / MySQL - How to access connection from another class?

  - by Alex

  I'm just getting my head around java (and OOP for that matter), the only thing I am familiar with is MySQL. I need to keep the DB connection open throughout the duration of the application, as well as a server socket. I'm not even sure if they both need separate classes, but here's what I have so far: http://pastebin.com/qzMFFTrY (it wouldn't all go in a code tag) The variable I need is con for line 86.

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• An existing Java codebase is not correctly structured by directory. Is there an automated tool that

  - by 99problems

  I'm quite happy to rig up a bash script to do this, but it would nice to have an automated tool to sort java files into the correct directories (after creating them). Thanks!

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• in java can one have an array of variables?

  - by David

  in java can you have an array of variables? if so what is the syntax? here's an example if your confused: varint[] ArrayOfVariablesThatAreInts = new varint[#] or var[] ArrayofVariables = new var[#] is something like this legal?

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• I want to print any text without using Print function in java?

  - by Sanjeev

  I want to print any text without using system.out.println() in java? It is possible If yes then how; Any idea.

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• how to get svc/cvs log record by java?

  - by Eric

  I want to cut the svn/cvs recods in pieces and then put in to database. After that i can make use of those data easily. Any java function can get out the record? and How? If possible, please provide a example. Thank you.

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• Reading from a very large table using multiple threads (Java ) and writing them to a single file

  - by user2534926

  I am currently facing a situation where i have a table with almost 80 millions data and i have to take a dump of that table and store it into a csv file. Currently i am using a not so professional approach( with a perl script+DBI interface , printing the values to stdout and redirecting to a csv file). Now i am planning to use java threading approach. Can you suggest a way forward. Thanks in advance

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• How can an application utilize multiple cores or CPUs in .NET or Java?

  - by lfoust

  When launching a thread or a process in .NET or Java, is there a way to choose which processor or core it is launched on? How does the shared memory model work in such cases?

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• why the String class in java does not implement Iterable?

  - by xyzzyz

  Hey, many builtin classes in Java implement Iterable, however String does not. It makes sense to iterate over chars in the String, just as one can iterate over items in regular array. Is there a reason behind it?

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• Why doesn't the String class in Java implement Iterable?

  - by xyzzyz

  Many Java framework classes implement Iterable, however String does not. It makes sense to iterate over characters in a String, just as one can iterate over items in a regular array. Is there a reason why String does not implement Iterable?

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• when does java.util.zip.ZipFile.close() throw IOException?

  - by sk

  Under what circumstances would java.util.zip.ZipFile.close() throw an IOException? Its method signature indicates that it can be thrown, but from the source code there doesn't seem to be any place where this could happen, unless it's in native code. What corrective action, if any, could be taken at the point where that exception is caught?

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• how to check null against a string in java?

  - by k38

  how to check null against a string in java? i am using stringname.equalsignorecase(null) but its not working.....

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