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• Java: Using Dynamically loaded classes

  - by Snigger

  Hi I'm new to java. I'm trying to use some dynamically loaded classes in my application. The application doesn't know classes , Just it try to load a class by name that its name came from input. It doesn't know class (So I can't use casting) but just needs to call some methods of that class (every class should have that methods). I thought about interfaces but I don't know how. How can I call those methods? Thanks

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• Capitalize all letters in a Textfield in Java

  - by Gordon

  Is it to possible to capitalize the letters in a Textfield as they are being typed by the user in Java? E.g. The user would type 'hello' and 'HELLO' would appear in the Textfield. (Odd request and I don't like the idea either.)

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• Using a java class from Delphi

  - by user193655

  I need to use the logic contained in some java classes. I found JNI, but that project seems not updated recently. Is there a way to use it in a Delphi native application? I use Delphi 2009.

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• Java App on MAC asking for allow network connections everytime

  - by gmugmu

  My Java.app broadcasts a packet on the network as soon as it starts up. Everytime I start this app, the MAC asks me do I want to allow network connections blah..blah.. Can I use info.plist or something to allow network access to this app and not bother the user who has trustingly downloaded and installed my app. Thanks

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• Java Swing - good idea?

  - by Mike

  hi, simple question : I need to write cross platform application (basically CRUD). Is usage of Java Swing good idea? Or is it out-dated and you know better solution? I dont want to use like 5 languages for various stuff, one or two should be enough. Thanx!

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• Creating an instance of a subclass extending an abstract class (Java)

  - by dacay

  In Java, is there any way to create an instance of any class that extends abstract class A, inside a member method of class A? Classes that extends abstract class A will return their instances with this method, but i don't want to implement same method in all subclasses with a "return this();" kind line.

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• Java: "implements Runnable" vs. "extends Thread"

  - by goosefraba19

  From what time I've spent with threads in Java, I've found these two ways to write threads. public class ThreadA implements Runnable { public void run() { //Code } } //with a "new Thread(threadA).start()" call public class ThreadB extends Thread { public ThreadB() { super("ThreadB"); } public void run() { //Code } } //with a "threadB.start()" call Is there any significant difference in these two blocks of code?

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• How to display an image(all major formats), selected by JFileChooser in java

  - by Tushar Maroo

  I am developing an image editing app, so want to display an image selected by JFileChooser, so what would be best approach so that it can display all formats jpg, png, gif etc. OpenButton is used for invocation of filechooser. private void OpenActionPerformed(java.awt.event.ActionEvent evt) { int returnVal = fileChosser.showOpenDialog(this); if (returnVal == JFileChooser.APPROVE_OPTION) { File file = fileChosser.getSelectedFile(); // What to do with the file // I want code for this part try { //code that might create an exception } catch (Exception e1) { e.printStackTrace(); } } }

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• performSelectorOnMainThread equivalent in Java for Android

  - by Daniel A. White

  I have an iPhone application and I am porting it over to Android. I have a service/controller that spawns new threads to perform some network tasks. I use performSelectorOnMainThread in my iPhone app. How can I have my Java app do the same or similar thing?

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• Java image with double value pixel

  - by marionmaiden

  Actually I'm working with BufferedImages, that provide me pixel values in int type. Do you know a Java object to represent an image that the pixel value in double or float type?

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• Java socket programming header

  - by Andy

  Hi, I am trying to send a file through a java socket and receive it through another. However, this happens: Send Content: /* This is simply a file to transfer */ Received: ¨Ì

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• Java - Regular expression question

  - by Jacob

  I am new to regular expressions. I want to use java's replaceAll() function to replace any CSS comments in a string. Basically I want to use regex to search for anything that is surrounded by "/*" and "*/" and replace it with "".

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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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• 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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• Expanding Java Memory-Mapped Byte Buffer

  - by geeko

  Greetings All, Is there a way to expand the Java memory-mapped byte buffer such that the new size is reflected back to the mapped file on disk ? Thank you !

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• Need example of Java Client Destop App consuming Two-way SSL Secured webservcie

  - by Rick

  I'm looking for an example of a java desktop application that consumes a Two-way SSL secured web service. Any tutorials or examples would be great, especially if they are based on the Eclipse IDE. Thanks.

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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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• 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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• Why do people run Java GUI's on the Event Queue

  - by asmo

  In Java, to create and show a new JFrame, I simply do this: public static void main(String[] args) { new JFrame().setVisible(true); } However, I have seen many people doing it like this: public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { new JFrame().setVisible(true); } }); } Why? Are there any advantages?

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• Java standard library - graph?

  - by Amir Rachum

  Is there a representation of a graph in Java standard libraries, like there is in the boost library in C++? Is there a graph representation which is a standard in the business?

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• Assertion in Java?

  - by Praveen Chandrasekaran

  what is assert keyword in java? tell me some real time example to understand the key role of the assertion's need?

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• Changing the default Windows language with Java application

  - by nedjma

  Can I change the default language of my host system (Windows XP) with a Java application? If yes, how I can do it?

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• Creating a simple java hash server

  - by Blankman

  Is it possible to create a simple server in Java that returns a response based on a given key? So it would be a simple program, that stores a hashmap and returns the result based on a key provided by the client. What would be the fasted implementation, to have it over HTTP or a socket? The client will be a web based application.

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• Is it worth learning C# or Java in 2010

  - by Dhawal

  We are in web era standalone applications are almost gone everyone wants their internet application to run inside browser, programming languages like Ruby, Python and scala are becoming more and more mainstream. Sometimes I wonder what these programming language offer which make them top choice of IT companies, if I plan to become a freelance web developer is it worth learning C# or Java. I read beginner's book for both of them, but to master any of them require some time investment.

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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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