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• ConcurrentHashMap in Java?

  - by Praveen Chandrasekaran

  what is the use of concurrent hash map in java? where we have to use this? what are the comforts in it? help please. how it works? sample codes are easy to understandable..

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• Convert a byte into a boolean array of length 4 in Java

  - by Agrajag9

  I need to convert a byte into an array of 4 booleans in Java. How might I go about this?

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• Validating input using java.util.Scanner [closed]

  - by bhavna raghuvanshi

  I'm taking user input from System.in using a java.util.Scanner. I need to validate the input for things like: It must be a non-negative number It must be an alphabetical letter ...etc What's the best way to do this?

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• Programatic Access to the Java Plug-in Control Panel

  - by Mike Caron

  Is there a way to access the Java Plug-in Control Panel programatically? Or at least find the places in the Windows File System where the information backing that control panel is stored?

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• Java Compare Addresses

  - by Tom

  Hi, Does anyone know a library to compare addresses in Java ? Something that would give equality on addresses, written in different ways. For example, it should recognize that "22 Acacia Avenue" and "22 acacia av." is the same address. Of course, this can escalate a lot, that's why i'm asking. Thanks in advance.

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• Which CMS should i use for building website in java

  - by Mirage

  I use joomla to build php websites as it has logins , registrations and many extension to make my work easier. IS some cms available for building webistes in java with some pre loaded features so that i don't have to code it from scratch

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• Is PKCS#1 V2.0 implemented for Java?

  - by Tom Brito

  I need encrypt data using exactly the PKCS#1 V2.0 encryption method (defined in item 7.2.1 of the PKCS#1V2 specification). Is it already implemented for Java? I'm thinking in something like just pass a parameter to javax.crypto.Cipher specifying "PKCS#1V2", I wonder if there is something like this?

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• How Java do the string concatenation using "+"?

  - by Tom Brito

  I read about the way Java works with += operator, using StringBuilder. Is it the same with a ("a" + "b") operation?

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• When does Java's JVM unzip jar files?

  - by TwentyMiles

  Java's jar file format builds off of the zip file format, and supports compression of the class files inside it. When and how does the JVM decide which class files to uncompress and pull out of the jars on its classpath? Is the process dynamic and done at runtime as classes are needed, or are they all uncompressed up front before the program actually runs?

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• Java: Check if file is already open

  - by hello_world_infinity

  I need to write a custom batch File renamer. I've got the bulk of it done except I can't figure out how to check if a file is already open. I'm just using the java.io.File package and there is a canWrite() method but that doesn't seem to test if the file is in use by another program. Any ideas on how I can make this work?

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• How can I create an image with Java?

  - by Roman

  I would like to create a gif image of a filled red circle on a green background. What is the easiest way to do it in Java?

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• Simple Java AMPQ server

  - by splix

  Are there exists an simple AMPQ server/broker implementation written in Java? I need it only for local integration tests, starting it from ant/maven, and i don't need any features like a clustering, persistence, performance and so on. Just a fake RabbitMQ-like instance, without installation (just as a dependency at maven pom) and configuration.

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• [Java] how to run in background

  - by Daeyun

  I want my Java program to run in the background. I'm on Windows 7. Do you have any idea? Thanks!

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• Determining the version of Java SDK on the Mac

  - by Ali_IT

  I have a MacBook Pro running Snow Leopard; how can I see what version of the Java SDK is installed on my Mac?

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• Reverse "Hello World" in Java

  - by Vicheanak

  Hello I want to do reverse each word of the String in Java example if input String is "Hello World" then the output should be "olleH dlroW".

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• identifiers in java with different versions?

  - by GK

  as we "No keyword should be used as an Identifier in java". But there will be some words like asser or enum or any other which have been added as keyword in version 1.4, 1.5 resp. So if any older version code is used to compile with new javac, what happens if that code contains these words as an identifier?

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• Getting compilation timestamp of a java class

  - by Alex Kravets

  Is it possible to reliably determine the compilation time stamp of a given class for both java applications running locally and as applets and/or JNLP webapps ?

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• Can I add Java portlet in sharepoint 2007?

  - by Samiksha

  Can I add Java portlet in sharepoint 2007? If yes, can some please explain the details on how can I do so?

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• How to use a java scoket in tapestry5?

  - by shane87

  How do I implement a java socket in tapestry5? Should it go in the services sub-package? if so how do i use it?

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• why java Object class is not abstract ?

  - by JavaUser

  Hi, Why java's Object class is not an abstract class . Is there any specific reason ? Thx.

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• Java: unwanted characters at the beginning of a text file

  - by Patrick

  hi, when I write a new text file in Java, I get these characters at the beginning of the file: ¨Ìt This is the code: public static void writeMAP(String filename, Object object) throws IOException { ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(filename)); oos.writeObject(object); oos.close(); } thanks

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• Java xml binding with wrong xmlns attribute name

  - by Tom Brito

  When I use the annotation: @XmlRootElement(name="RootElement", namespace="namespace") class RootElement { to create xml file from java, it creates the root element as: <ns2:RootElement xmlns:ns2="namespace"> but I wanted to create without the "ns2", like: <RootElement xmlns="namespace"> Any idea how to fix it? Reletad link (example I used to create the xml): http://www.java2s.com/Code/JavaAPI/javax.xml.bind.annotation/XmlRootElementname.htm

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• Getting default value for java primitive types

  - by ripper234

  I have a java primitive type at hand: Class c = int.class; // or long.class, or boolean.class I'd like to get a 'default value' for this class - specifically the value is assigned to fields of this type if they are not initialized. E.g., '0' for a number, 'false' for a boolean. Is there a generic way to do this? I tried c.newInstance() But I'm getting an InstantiationException, and not a default instance.

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• Best cache framework for Java

  - by Rodrigo Asensio

  I need to implement a cache solution in java for a cluster of 9 servers with web applications. I saw apache JCS, seems old, do you know another open source solution ? thanks

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• java.util.Random zero argument enquiry

  - by deerb

  I am trying to code a game following instructions contained in an OU TMA document which read: In the constructor, write code to assign a new instance of Random to ran which you should create using the Random class's zero argument constructor Will this code work? Random ran = new Random(0) ; I am a relative newbie to Java, and I don't understand exactly what the instructions mean

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