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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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 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 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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• Any function / method in Java to implement a "freeze panes"-like sheet?

  - by MikeG

  We are using Java and Javascript to try to display a huge sheet with freeze panes, but it is being very difficult. Does someone know about a library, method, script or something, either free or commercial, to do this? Thanks.

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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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• 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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• Does the List in .NET work the same way as arraylist in Java?

  - by eflles

  When I learned Java, I was told that the arraylist works this way: It creates an array with room for 10 elements. When the 11th element is added, it is created a new list with room for 20 elements, and the 10 elements are copied into the new array. This will repeat as until there are no more elements to add, or to a maximum size. Is the List in .NET constructed the same way?

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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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• 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 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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• 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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