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• Do different JDK Updates produce different Java byte code?

  - by Bernhard V

  A hypothetical scenario: I've got a project whose source compliance level is specified to 1.5. Now I compile this project with two different JDKs: At first with JDK 6 Update 7 and then with JDK 6 Update 20. Do these two different JDKs produce different Java byte code, although they only differ in their Update version?

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• How to find and kill running Win-Processes from within Java?

  - by GHad

  Hi, I need a Java way to find a running Win process from which I know to name of the executable. I want to look whether it is running right now and I need a way to kill the process if I found it. Thank you! Greetz, GHad

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• How can I create a bar in the bottom of a Java app, like a status bar?

  - by paintrick

  I am in the process of creating a Java app and would like to have a bar on the bottom of the app, in which I display a text bar and a status (progress) bar. Only I can't seem to find the control in NetBeans neither do I know the code to create in manually. Thank you so much for helping! Paintrick

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• Why can't your switch statement data type be long Java?

  - by Fostah

  Here's an excerpt from Sun's Java tutorials: A switch works with the byte, short, char, and int primitive data types. It also works with enumerated types (discussed in Classes and Inheritance) and a few special classes that "wrap" certain primitive types: Character, Byte, Short, and Integer (discussed in Simple Data Objects ). There must be a good reason why the long primitive data type is not allowed. Anyone know what it is?

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• How to get number of attributes in a java class?

  - by llm

  I have a java class containing all the columns of a database table as attributes (member variables) and corresponding getters and setters. I want to have a method in this class called getColumnCount() that returns the number of columns (i.e. the number of attributes in the class)? How would I implement this without hardcoding the number? I am open to critisims on this in general and suggestions. Thanks.

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• Can we call methods of non-static classes without an object in Java?

  - by ask

  In Java, the wrapper class Integer has the static method parseInt() which is used like this: Integer.parseInt(). I thought only methods of static classes could be called like this (ie. Class.doMethod()). All non-static classes need objects to be instantiated to use their methods. I checked the API, and apparently Integer is declared as public final Integer - not static. Someone please help me understand this.

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• How do I create a "global variable" in Java such that all classes can access it?

  - by Chrystle Soh

  here's my problem: I have multiple classes that are part of the same package and they need access to a certain file path String filePath = "D:/Users/Mine/School/Java/CZ2002_Assignment/src/" Rather than declaring the same Filepath in every single class, is it possible to simply have a "global" type of variable of this FilePath so that all classes can access it and I only need to declare and update it once. Thanks

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• Is it a good idea to use unicode symbols as Java identifiers?

  - by Eric

  I have a snippet of code that looks like this: double ?t = lastPollTime - pollTime; double a = 1 - Math.exp(-?t / t); average += a * (x - average); Just how bad an idea is it to use unicode characters in Java identifiers? Or is this perfectly acceptable?

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• Can I run a webpage-embedded Java Applet on the iPhone's web browser?

  - by Warlax

  Can I run a Java applet that's been embedded in an or HTML tag on an iPhone? I don't mean as an App but actually through its browser.

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• How can I get the invocation handler for a Java proxy?

  - by ripper234

  Given: Object innerProxy = ... Object proxy = java.lang.reflect.Proxy. newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class[]{type}, innerProxy); How can I extract the innerProxy object from proxy?

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• Do resource bundles in Java support runtime string substitution?

  - by Benju

  Can you do the following with a Java ResourceBundle? In the properties file... example.dynamicresource=You currently have {0} accounts. At runtime... int accountAcount = 3; bundle.get("example.dynamicresource",accountCount,param2,...); To give a result of "You currently have 3 accounts."

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• Why right click is not working on java application?

  - by Nitz

  Hello Guys, I had made one Java Swing based application. On my application,if i click anywhere on the JFrame or anything, then my right click is not working? i had not set anything like that..then why is not working? Basically my key board was not working then i try to copy - paste data using mouse then, i came about to know that...my right click is not working on any area of my application...

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• Is Maven 1.0.2 compatible with Java 5?

  - by hdk

  I'm working on an upgrade project and build management is done in Maven 1.0.2. Java version will change to J2SE 5. Please include in your answer if you have first hand experience on that particular combination (Maven 1.0.2 and J2SE 5) Thanks hdk

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• How does Garbage Collection in Java work with classes?

  - 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 to. Is this true? And if it is true, how does this work?

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• in java is the name of a method a string?

  - by David

  in java is the name of a method a string? why or why not? so if i have something like: public static int METHODNAME (some parameters or not) { something to do ; } is METHODNAME a string?

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• What is best practice in converting XML to Java object?

  - by newbie

  I need to convert XML data to Java objects. What would be best practice to convert this XML data to object? Idea is to fetch data via a web service (it doesn't use WSDL, just HTTP GET queries, so I cannot use any framework) and answers are in XML. What would be best practice to handle this situation?

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• What is best practise in converting XML to Java object?

  - by newbie

  I need to convert XML data to Java objects. What would be best practise to convert this XML data to object? Idea is to fetch data via webservice (it doesn't use WSDL, just HTTP GET queris, so I cannot use any framework) and answers are in XML. What would be best practise to handle this situation?

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• how to run SSH commands on remote system through java program?

  - by sweety

  Hi all, I am new to this kind of application and looking for some sample code how to connect to remote server using SSH , execute commands and get output back using java as programming language. Thanks in advance..... Regards, Devayani

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• Does the Java Native Access API locally save the native libraries for execution?

  - by jigjig

  Hi All, I was just wondering if anyone knew whether the Java Native Access API will locally save the native libraries into a temporary location before or when loading and using native libraries?

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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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• How-to delete indexes in Google App Engine (Java)?

  - by Antonio

  Is there a way to delete unused indexes in Google App Engine Java application? The only one way I was able to find is to create an empty Python GAE application and run the following command: appcfg.py vacuum_indexes /path/to/myapp/ Is there a more intelligent way?

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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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• 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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• Does grails support logging from the src/java classes?

  - by rainyday

  I have a grails app (v 1.1.2) the logging is working fine from the groovy classes, but I can't get it to work from within a java source... I have a class in package com.mforms.devices., it imports apache log4j, defines the logger as follows private final org.apache.log4j.Logger loggy = Logger.getLogger(this.getClass()); then refer to it later by doing loggy.error("...") my Config.groovy has the following log4j = { error 'com.mforms' root { error 'stdout', 'file' additivity = true } } What am I doing wrong?!?!

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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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