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• Simplest way to draw primitives in Java (not OpenGL)

  - by Little Jeans

  Just started to getting familiar with graphics in Java. What is the simplest way to draw primitives (lines, rectangles) in Java without OpenGL (JOGL)? Looking for methods like putPixel, lineTo, etc.

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• convert java into jar

  - by firestruq

  Hi, A little help from you all... I was trying to convert a simple java program into jar but nothing seems to happened. I have 2 files: Tester.java , Tester.Class. Then I used this command line: jar -cvf Tester.jar Tester.class The .jar file was created but nothing seems to work. What did I missed? thanks

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• Thinking about using Bluej to learn Java

  - by lions_leash

  I would like to start learning Java, but there are so many resources out there... I am having a hard time deciding which path to take. I saw a neat book, Objects First with Java, and I tested out Bluej and some tutorials. Anyone use this and have comments?

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• Understanding java's native threads and the jvm

  - by Moev4

  I understand that the jvm is itself an application that turns the bytecode of the java executable into native machine code, but when using native threads I have some questions that I just cannot seem to answer. Does every thread create their own instance of the jvm to handle their particular execution? If not then does the jvm have to have some way to schedule which thread it will handle next, if so wouldn't this render the multi-threaded nature of java useless since only one thread can be ran at a time?

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• Run Java-applets directly ( without html page )

  - by PleaseHelpMe

  Hello guys. I have a problem. How i can run my java-applet directly without embedded in my web page? I know appletViewr can execute applet without a browser but I need to get java applet without html page.

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• visually show diff output in a java program

  - by Muhammad Asaduzzaman

  I am currently developing a java program where I need to show the difference between two text. Is there any library available for visually show the difference, that is the diff output in my java program or how can I do so. Any suggestion will be very helpful for me.

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• Which logging library to use for cross-language (Java, C++, Python) system

  - by recipriversexclusion

  I have a system where a central Java controller launches analysis processes, which may be written in C++, Java, or Python (mostly they are C++). All these processes currently run on the same server. What are you suggestions to Create a central log to which all processes can write to What if in the future I push some processes to another server. How can I support distributed logging? Thanks!

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• Calendar Control in Java

  - by user209335

  How can i control calendar user interface in java? My current project needs to provide calendar in web. User can control public holiday, block day and so on when client choose to book. So i need to provide calendar control with java. If anyone have idea, pls help me to solve. Thanks. Regards, leo

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• Creating Notepad in Java

  - by Saranya.R

  Hi.......... I am creating a notepad application in Java.I have created the text area also the menus .I have a menu called "EDIT" and under that I have "UPPERCASE"..If i select a particular text and click on "UPPERCASE" ,I want the string to be converted into uppercase. Can anyone tell me how to implement this in Java.

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• Connecting FLEX 3.0, JAVA WITH MYSQL

  - by Nithi

  How to connect to MYSQL DB from Java, create table, insert data, retrieve it with datatypes. How to make use of the data to/from in Flex application. plz help me out.. i have basic knowledge in sending and receiving messages using BlazeDS. and calling JAVA METHODS USING ...

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• Why should Java ThreadLocal variables be static

  - by kellyfj

  I was reading that JavaDoc for Threadlocal here http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ThreadLocal.html and it says "ThreadLocal instances are typically private static fields in classes that wish to associate state with a thread (e.g., a user ID or Transaction ID). " But my question is why did they choose to make it static (typically) - it makes it a bit confusing to have "per thread" state but its static?

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• Calling Maven goals from Java

  - by ned24

  Is it possible to call Maven goals from Java, for instance, can I do the equivalent of: mvn clean package from a Java class? thanks, Nick

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• Accurate Sleep for Java on Windows

  - by HaBaLeS

  Does anyone know a Library which provides a Thread.sleep() for Java which has an error not higher than 1-2 Millisecond? I tried a mixture of Sleep, error measurement and BusyWait but I don't get this reliable on different windows machines. It can be a native implementation if the implementation is available for Linux and MacOS too. EDIT The link Nick provided ( http://blogs.sun.com/dholmes/entry/inside_the_hotspot_vm_clocks ) is a really good resource to understand the issues all kinds of timers/sleeps/clocks java has.

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• meaning of import statement in java file

  - by Rozer

  Can any one clear me exactly what happend when we do import statement in java files. does it inscrease the size of file if we add more and more java classes. why we dont use classloader for the same and what are the restrictin for importing.

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• (Java) weird value of System.getProperty("os.version")

  - by Helpme

  hello fellow java developers, Im trying toget the System.getProperty("os.name") of my own machine. I am running a java application directly from the machine from within eclipse. My machine is "windows 7" the returned value is "windows vista" ! Seems wrong, very wrong. and yes I am sure that I am running the app on a windows 7 machine... Any ideas as to what is going on here?

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• Java: how to initialize String[]?

  - by Heoa

  Error % javac StringTest.java StringTest.java:4: variable errorSoon might not have been initialized errorSoon[0] = "Error, why?"; Code public class StringTest { public static void main(String[] args) { String[] errorSoon; errorSoon[0] = "Error, why?"; } }

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• Building an IRC bot in Java

  - by Waltzy

  After some googling an obvious answer or starting point for a Java IRC bot has not presented itself, my question; is there an existing framework to help me do build an IRC bot? Failing that, is this possible using Sockets in Java to do this and has anyone seen an example around the web? cheers guys.

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• multi threading python/ruby vs java?

  - by fayer

  i wonder if the multi threading in python/ruby is equivalent to the one in java? by that i mean, is it as efficient? cause if you want to create a chat application that use comet technology i know that you have to use multi threading. does this mean that i can use python or ruby for that or is it better with java? thanks

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• why two date classes one in java.util.Date and java.sql.Date?

  - by giri

  HI I like to know why there are two Date classes in two different packages one in java.util.Date and one in java.sql.Date? Whats the use of having two Date classes?

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• Java generics - getting the type..

  - by peter

  Hi! I'm a c# guy giving Java a try .. so how would I do the following in java. in C# public T create_an_instance_of<T>(){ T instance = default (T); // here's usually some factory to create the implementation instance = some_factory.build<T>(); // or even.. instance = some_factory.build(typeOf(T) ); return instance; }

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• Returning char array from java to C - JNI

  - by Malik

  I have a object store in Java. My C program stores data (in form of char array) in java. Now I wish to retrieve data from my store. I cannot find any function call that returns me an char array. How can I do this?

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• Overload with different return type in java?

  - by nunos

  So, I am just starting Java and, even though I have looked in some question about it here at stackoverflow.com and elsewhere, haven't been able to find a straightforward answer to why isn't possible to overload a function just by changing the return type. Why is it so? Will that provably change in a future version of Java? By the way, just for reference, is this possible in C++? Thanks.

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• Downsides to immutable objects in Java?

  - by parkr

  The advantages of immutable objects in Java seem clear: consistent state automatic thread safety simplicity You can favour immutability by using private final fields and constructor injection. But, what are the downsides to favouring immutable objects in Java? i.e. incompatibility with ORM or web presentation tools? Inflexible design? Implementation complexities? Is it possible to design a large-scale system (deep object graph) that predominately uses immutable objects?

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• How to convert Java program into jar?

  - by firestruq

  A little help from you all... I was trying to convert a simple java program into jar but nothing seems to have happened. I have 2 files: Tester.java , Tester.Class. Then I used this command line: jar -cvf Tester.jar Tester.class The .jar file was created but nothing seems to work. What did I miss?

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• Java Version of Action Delegate

  - by ikurtz

  the issue i mentioned in this post is actually happening because of cross threading GUI issues (i hope). could you help me with Java version of action delegate please? in C# it is done as this inline: this.Invoke(new Action(delegate() {...})); how is this achived in Java? thank you.

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