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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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• What's the right Java generic for a collection of elements with unique addressable indices?

  - by Rocreex

  I'm on my way to programming a database application and in our course we are told to implement a library of elements using one of the Java Collections. Each of the elements has a unique ID with which it's supposed to be addressed. Now I am wondering how this can be done. I though about using a ListArray but this won't work because the only way of addressing List elements is through the index which you can't control. Do you have some advice for me?

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• Creating PDF, HTML, and optionally RTF documents from the same source using Java?

  - by Jared

  I was looking at using iText to create both a pdf and html version of a document with RTF as a possible option. According to this question this is no longer possible with iText. Is there a library that will allow me to create a document in Java and output it as both PDF and HTML? The ability to output RTF would be nice but is not required.

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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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• 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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• Why is Java layout system so complicated to work with?

  - by Tom Brito

  Some points that make java swing layout system a nightmare: There's thousands of properties; Even if you learn all the properties, each layout manager ignores some properties; The only existing good RAD tool (NetBeans) does not work well; Layout managers behave different with components and containers inside it.

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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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• Simple way to play a single frequency in java?

  - by alleywayjack

  I just want to play a very simple, straight forward note by giving my computer a certain frequency as an integer, and from there I can figure out how to make it play the note longer or shorter. It does not necessarily have to come out of the actual sound card - if it's generated and output by the internal speaker that's okay. I looked at the midi libraries that java has included, and they are way more than what I want to do. This just needs to be very basic.

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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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• What is the best way to send data from Java to PHP?

  - by Daeyun

  I want to access a MySQL database from Java, but remote connection is disabled by the host. So I will send the data to PHP and then PHP will locally access the database. The data is pretty big (about 2~4kb) I've never done this before. What should I do?

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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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• Why can't your switch statement data type be long Java?

  - by Fostah

  Here's an excerpt from Sun's Java tutorials: A switch works with the byte, short, char, and int primitive data types. It also works with enumerated types (discussed in Classes and Inheritance) and a few special classes that "wrap" certain primitive types: Character, Byte, Short, and Integer (discussed in Simple Data Objects ). There must be a good reason why the long primitive data type is not allowed. Anyone know what it is?

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• How to add a spring application context to the java runtime to be used for integration tests within

  - by user258030

  I am trying to add a test spring application context to the java runtime, so that my beans can be wired properly for my integration tests.

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• PHP front-end and Java back-end for a web app?

  - by Raydon

  I'm designing a web application. I was wondering if it was feasible to design a php front end (using some php framework e.g. CakePHP), which stores and retrieves data to display to the user. Then develop a java backend which listens to the database for changes, and depending on what was changed, performs some actions and updates the database. Any thoughts on this type of implementation would be appreciated.

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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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• Does the Java Native Access API locally save the native libraries for execution?

  - by jigjig

  Hi All, I was just wondering if anyone knew whether the Java Native Access API will locally save the native libraries into a temporary location before or when loading and using native libraries?

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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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• 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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• 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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• 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 to draw interactive frame over user's desktop using java applet?

  - by Extax2

  I need to capture portion of user screen usign java applet. It is easy to do using Robot class but I'd like user to select which portion of screen to capture in draggy-droppy way. So I need to draw rectangular frame over users desktop and response when user resizes it. How could I do it? Thnx.

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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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• What's a good free tool for investigating unintentional object retention in Java?

  - by Steve Emmerson

  My multithreaded Java program crashes because it runs out of heap space and I don't think it should. Assuming the culprit is unintentional object retention, what's a good free tool to investigate what objects are being unintentionally retained? My IDE is Eclipse.

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• Can we call methods of non-static classes without an object in Java?

  - by ask

  In Java, the wrapper class Integer has the static method parseInt() which is used like this: Integer.parseInt(). I thought only methods of static classes could be called like this (ie. Class.doMethod()). All non-static classes need objects to be instantiated to use their methods. I checked the API, and apparently Integer is declared as public final Integer - not static. Someone please help me understand this.

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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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