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• Can we run an Java app in a system without JRE?

  - by Praveen Chandrasekaran

  Hi Folks, I created an java apllication. i created the Excecutable jar and Exe files for my application. But it cant be run at a system which not installed computer. How to do it? Is there any possible to configure the JRE in the EXEcutable jar or Exe file itself? Any Idea?

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• How can I measure the speed of code written in Java? (AI algorithms)

  - by Registered User

  Hi All, How can I measure the speed of code written in Java? I planning to develop software which will solve Sudoku using all presently available AI and ML algorithms and compare time against simple brute-force method. I need to measure time of each algorithm, I would like to ask for suggestions on what is the best way of doing that? Very important, program must be useful on any machine regardless to CPU power/memory. Thank you.

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• What is the difference between a stream and a reader in Java?

  - by Bragaadeesh

  Hi, Today I got this question for which I think I answered very bad. I said stream is a data that flows and reader is a technique where we read from that is a static data. I know this is an awful answer, so please provide me the crisp difference and definitions between these two with example in Java. Thanks.

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• Is it possible to execute binary files in java?

  - by Dimitri

  Hi, I have a list of binaries written in java, ada,C, python and I want to execute them. How to do that ? Is there any JVM binding to those languages ? Thanks for your answers

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• Is there a timeout for threads waiting on a synchronised method in Java?

  - by MalcomTucker

  Is there a default timeout for threads waiting on a synchronised method in Java? Some threads in my app are not completing as expected. Is there anyway to check whether threads have died as a result of timeouts?

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• Can anyone recommend a java FOSS server that does all the typical protocols (ssh etc).

  - by mP

  I would like to add the ability for users to telnet into my app where by they can type in commands etc. I would like a simple Java Telnet server whereby i can provide the authentication strategy.

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• How to make switch case accept multiple data types in Java?

  - by Starx

  While using Java's switch case, it excepts only char and int, but I want to provide string cases. How to make this possible?

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• does java have an in-built Antivirus? is it true?

  - by androidbase Praveen

  Does the Java have an in-built antivirus? One of my friends told me there is in the JDK itself - it's called the "sandbox". Is it true?

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• Which Java ORM is considered the most performant generally speaking?

  - by Blankman

  Which Java ORM is considered the most performant generally speaking? I realize this could mean less features, but just want an idea.

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• How can I retrieve the amount of free RAM from a Java program?

  - by swati

  Free RAM: my target metric. Java: my tool of choice. ???: a good way to get the former using the latter.

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• How to sort a Map<Key, Value> on the values in Java with google collections ordering function

  - by chris-gr

  How to sort a map(?,B) on the values in Java with google collections ordering function, if B is a class, which has a field of type double, which should be used for ordering.

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• Any reason to clean up unused imports in Java, other than reducing clutter?

  - by Kip

  Is there any good reason to avoid unused import statements in Java? As I understand it, they are there for the compiler, so lots of unused imports won't have any impacts on the compiled code. Is it just to reduce clutter and to avoid naming conflicts down the line? (I ask because Eclipse gives a warning about unused imports, which is kind of annoying when I'm developing code because I don't want to remove the imports until I'm pretty sure I'm done designing the class.)

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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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• How to change to a different port for Java servlet to listen ?

  - by Frank

  I use Netbeans6.7 to develop Java servlet. It defaults to port 8080. How do I change the port number to 8083 for example?

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• What's a good free tool for investigating unintentional object retention in Java?

  - by Steve Emmerson

  My multithreaded Java program crashes because it runs out of heap space and I don't think it should. Assuming the culprit is unintentional object retention, what's a good free tool to investigate what objects are being unintentionally retained? My IDE is Eclipse.

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• how to get svn/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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• How can I display a PPT file in a Java Applet?

  - by Sanjeev

  I want to open and display an existing Microsoft PowerPoint presentation in a Java Applet. How can I do that?

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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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• What is the best way to send data from Java to PHP?

  - by Daeyun

  I want to access a MySQL database from Java, but remote connection is disabled by the host. So I will send the data to PHP and then PHP will locally access the database. The data is pretty big (about 2~4kb) I've never done this before. What should I do?

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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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• 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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• Simple way to play a single frequency in java?

  - by alleywayjack

  I just want to play a very simple, straight forward note by giving my computer a certain frequency as an integer, and from there I can figure out how to make it play the note longer or shorter. It does not necessarily have to come out of the actual sound card - if it's generated and output by the internal speaker that's okay. I looked at the midi libraries that java has included, and they are way more than what I want to do. This just needs to be very basic.

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• How do I keep a datastructure in sync across several servers in Java?

  - by sanity

  Have a Map which contains objects that I want to keep in sync across multiple servers, such that if objects in the map are created, deleted, or modified - this is reflected immediately (ie. within a second or two) across all servers, in a way that can potentially scale up to tens of servers. Is there a lightweight open source Java tool that can do something like this? I'm aware of Terracotta but it is rather heavy weight for what I need.

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• Are there java libraries to do a word-based diff?

  - by Mycol

  I have two pieces of text. I would like to make a word-based diff between them (like whe unix utility wdiff does) but with more information in the output (I mean, the character's posizion where the added/delited word starts). I need to do this in Java, so a simple output of the differences (like wdiff) doesn't suite for me: I would like to manipulate objects representing differences.

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• How to add a spring application context to the java runtime to be used for integration tests within

  - by user258030

  I am trying to add a test spring application context to the java runtime, so that my beans can be wired properly for my integration tests.

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