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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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• 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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• 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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• 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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• 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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• Create servlet from existing Java project

  - by user69514

  I have a Java Swing project for my class. I would like put it on my website so people can use it. However I'm not sure if there is a way to turn it into a servlet. Or do I need to know JavaScript? I'm confused. Is there a way to make my swing application into a servlet automatically?

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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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• Refreshing data in a java.sql.ResultSet

  - by llm

  I have a java.sql.ResultSet object containg data from a query that was run. How do I refresh the data in the ResultSet to reflect the current data in the database? Thanks!

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• Best Java thread-safe locking mechanism for collections?

  - by Simon

  What would be the least-slow thread-safe mechanism for controlling multiple accesses to a collection in Java? I am adding objects to the top of a collection and i am very unsure what would be the best performing collection. Would it be a vector or a queue? I originally thought an ArrayList would be fast but i ran some experiments and it was very slow. EDIT: In my insertion testing a Vector delared using volatile seems to be the fastest?

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• Hexadecimal string to byte conversion in java

  - by helpjava

  I have a hexadecimal string "41464353". I want to convert it into bytes. I know the value of this hex string in byte will be "65706783". I want this as answer. Please give me a program for this in Java.

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• Scalable images in Java

  - by CodeGuy

  I anticipate using some images in my Java application. These images will be drawn onto my JPanel using g.drawImage(). The JPanel is resizable and the images should scale as the JPanel increases/decreases in size Two questions: What image format is best for this type of desired scalable image? For instance, in this application, an image of size 100x100 may be scaled into an image of size 30x30 or 10x10 or 300x300. How can I write code to do this scaling?

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