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• How to create a 2D map in Java?

  - by Roman

  I would like to have a mapping which maps two string into one string. For example: map["MainServer","Status"] return "active". What is the best way to do it in Java. Should I use HashMap which include another HashMap as its elements?

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• Object Serialization for Undo/Redo Functionality Java

  - by user291989

  I have been trying to implement and undo/redo system in a game I am coding in Java. I am taking the approach of serializing the state of the game after each move. I there a way of saving the serialized objects on a stack and accessing them for undo/redo?

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• [Java] listening to keyboard input

  - by Daeyun

  I have a Java program that runs in the background without any UI. I want my program to exit when When I press Control+F9. Do you have any idea? Thanks!

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• How to customize application menu for java application in Mac OS

  - by Sunil Kumar Sahoo

  Hi I have created a java application. I found there is an application menu and about application in Mac. I donot know how to customize those about application dialog. i Want to write my own dialog instead of that dialog. How to do this. I found that I have to use Application Adapter. Thanks Sunil Kumar Sahoo

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• Pie, Bar, Line charts in java?

  - by Mandar

  I want to use Pie, Bar, Line charts in java. What is the best API to use them? Is there any API by Sun to create these types of charts?

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• Java Exceptions

  - by Mandar

  This may sound awkward ... But I didn't understand it. Why do we have compile-time error and not compile-time exception in java ? I mean to say that we never say compile-time exception. We tend to say it as compile-time error. Is there any specific reason for the same ?? Any suggestions are welcomed.... Thanks !

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• Error when using Java String split

  - by Dan Howard

  HI All, I've been using the basic split for a while - where I just parse out a string into an array based on a simple token like " " or ",". So of course a customer tries this: \\.br\ which fails miserably. I need to parse to an array of lines. The string for example looks like this: "LINE 1\\.br\\LINE 2\\.br\\LINE 3\\.br\\LINE 4\\.br\\" and this fails with java.util.regex.PatternSyntaxException: Unexpected internal error. Any ideas?

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• Java - Common Gotchas

  - by Alan

  In the same spirit of other platforms, it seemed logical to follow up with this question: What are common non-obvious mistakes in Java? Things that seem like they ought to work, but don't. I won't give guidelines as to how to structure answers, or what's "too easy" to be considered a gotcha, since that's what the voting is for. See also: Perl - Common gotchas .NET - Common gotchas

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• how good is java's UUID.randomUUID?

  - by Alvin

  I know randomized UUID have very very very low probability for collision in theory, but I am wondering, in practice, how good is java 5's randonUUID in terms of not having collision? Does anybody have any experience to share?

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• Java web service serialization

  - by Polaris

  I use Java service in .NET application. I can see and use enums which is used in web methods as parametrs but can't see enums which is not used in any web wethod.

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• java unload static fields

  - by Alina Danila

  I have a java class that uses complex static fields which need special operations as close() so that they are safely cleaned by GC. For the initialization of static fields I use the static block. But I don't now how to unload the static field safely, so that I can call the close() method before the field is cleaned up by GC. Is there any way to unload a static field, similar to the static initialization block?

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• java library for unit conversions

  - by Samuel

  Are there any java libraries (Apache Style licenses) which provide a higher level of abstraction for unit conversions. e.g. kilograms to grams or grams to kilograms meters to centimeters or centimeters to meters ft - inches to centimeters I have looked at JSR 275 but it seems to be in a rejected state. Any Apache 2.0 style license will definitely help me here.

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• How to use OSGi from java application

  - by EK

  Hi! I'm new whith OSGi, but it is interesting. Is it possible to interact between osgi bundles and java application? If it is possible, how? thanks!

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• how to draw simple eyes in java

  - by neville

  How can I draw simplest eyes in Java's swing ? I would like to get something like that : http://img710.imageshack.us/img710/70/eyesp.jpg

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• oracle connection manager Java Client example

  - by Sam

  Hi Experts, I am new to oracle connection manager. Can some help me with a Java Client code example to talk to a oracle database thru oracle connection manager. Thanks Sam.

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• How to write java program to read new emails from any emailid

  - by Sunil Kumar Sahoo

  Hi I want to write a java program where I will provide my email id and password. and I want to read all new unread messages that arrived to that email id. I donot know how to write program for that. Thanks Sunil Kumar Sahoo

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• file path Windows format to java format

  - by Manoj

  Hi all, I need to convert the file path in windows say C:\Documents and Settings\Manoj\Desktop for java as C:/Documents and Settings/Manoj/Desktop . Is there any utility to convert like this.?

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• Eclipse/Java code completion not working

  - by Rob

  I've downloaded, unzipped and setup Eclipse 3.4.2 with some plugins (noteable, EPIC, Clearcase, QuantumDB, MisterQ). Now I find when I'm editing Java projects the code completion is not working. If I type String. and press ctrl-space a popup shows "No Default Proposals" and the status bar at the bottom shows "No completions available". Any ideas? Thanks....

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• How to save Map object in Java to MySQL database

  - by Christian

  I have a Java Map (out of Strings and Ints) object that I want to save to a database. Is there a standard way to go about this task? Is there a way to compress the Map to take less space on the harddrive?

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• [java - xml] Get DTD from an XML file

  - by itit

  How can I get in Java the DTD file name specified in an xml file? So, if I have: <!DOCTYPE TEI SYSTEM "dtd-file.dtd" [ [ <!ENTITY c24r SYSTEM "c2r.jpg" NDATA JPEG> <!NOTATION JPEG SYSTEM "image/jpeg"> <!ELEMENT figure EMPTY> <!ATTLIST figure entity CDATA #REQUIRED> ]> I want the string "dtd-file.dtd"

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• Java Real Time explanation

  - by Marcus

  What exactly is the Java Real Time Specification? That is, how does it differ from the "regular" JSE or JEE specifications?

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• Regarding Java String dollar to cents conversion

  - by arav

  I have a java string which has an dollar value and cents value after decimal points and starting with a + or - sign. I want to convert into cents and store it in a integer (it can have + or -). Also i need to check if the cents part (after decimal point) not more than 2 digits and throw an error message if exists example : String dollval= "12.23" ,"12","-0.09", "-99","-99.0", "-99.23","0.00" int dollint = 1223,12,-9,-99,-00,-9923,0

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• Java 2D turn-based game programming: handle 2 mouse clicks per player

  - by Humberto Pinheiro

  So suppose I'm developing a chess-like program using Java's Swing. I added a MouseListener to handle user input. To make a move the user must click a valid piece and then click a valid place. What's the best way to track the 2 mouse clicks in a turn? I'm thinking in use some kind of variable to record if is the turn's first click or second.

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• How to deal with "java.lang.OutOfMemoryError: PermGen space" error

  - by Chris

  Recently I ran into this error in my web application: java.lang.OutOfMemoryError: PermGen space It's a typical Hibernate/JPA + IceFaces/JSF application running on Tomcat 6 and JDK 1.6. Apparently this can occur after redeploying an application a few times.

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• FileReader not found in Java Me

  - by cancelledout

  class java.io.FileReader not found I need this in order to get the file and then parse it with an xml parser. Anyone know any alternatives for this class?

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