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  • VB6's private static in C# ?

    - by blez
    In VB6 there are local static variables that keep their values after the exit of procedure. It's like using public vars but on local block. For example: sub count() static x as integer x = x + 1 end sub After 10 calls, x will be 10. I tried to search the same thing in .NET (and even Java) but there was none. Why? Does it break the OOP model in some way, and is there a way to emulate that.

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  • Are Maybes a good pattern for scala?

    - by Fred Haslam
    For a while I have been struggling to integrate scala with java methods that might return null. I came up with the following utility which helps a lot: // produce an Option, nulls become None object Maybe { def apply[T](t:T) = if (t==null) None else Some(t) } Maybe(javaClass.getResultCouldBeNull()).map( result => doSomeWork(result) ) I have a few questions about this solution: Is there a better or more standard pattern to use? Am I duplicating something that already exists? Does this functionality have hidden gotchas?

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  • How to LIMIT the text box length?

    - by sam
    I am working on eclipse java using swt jface with rcp. How can i limit the characters in my text box. Like if i want only 4 characters in my text box then what should i do? and what if i want alphanumeric combination . again in certain limit?

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  • Usecase for Workflow Engine

    - by Icarus
    Hi, We have an issue where a Database table has to be updated on the status for a particular entity. Presently, its all Java code with a lot of if conditions and an update to the status. I was thinking along lines of using a Workflow engine since there can be multiple flows in future. Is it an overkill to use a Workflow Engine here... where do you draw the line ?

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  • NoClassDefFoundError when running Netbeans 6.8 application

    - by Malachi
    My application has recently started throwing NoClassDefFoundError errors when I am running my application from within NetBeans. It never used to do this. And when I run this outside of NetBeans using the command line argument that it provides once built, these errors are not produced Is this a bug with Netbeans? I have reinstalled NetBeans as I recently had another that was resolved by reinstalling, however the problem still persists. http://stackoverflow.com/questions/2654892/symbol-error-in-java-application-using-netbeans-6-8-when-adding-a-shared-project Within Netbeans Outside NetBeans

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  • How to set text above and below a JButton icon?

    - by mre
    I want to set text above and below a JButton's icon. At the moment, in order to achieve this, I override the layout manager and use three JLabel instances (i.e. 2 for text and 1 for the icon). But this seems like a dirty solution. Is there a more direct way of doing this? Note -I'm not looking for a multi-line solution, I'm looking for a multi-label solution. Although this article refers to it as a multi-line solution, it actually seems to refer to a multi-label solution. EXAMPLE import java.awt.Component; import java.awt.FlowLayout; import javax.swing.BoxLayout; import javax.swing.Icon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; import javax.swing.UIManager; public final class JButtonDemo { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable(){ @Override public void run() { createAndShowGUI(); } }); } private static void createAndShowGUI(){ final JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new FlowLayout()); frame.add(new JMultiLabelButton()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } private static final class JMultiLabelButton extends JButton { private static final long serialVersionUID = 7650993517602360268L; public JMultiLabelButton() { super(); setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); add(new JCenterLabel("Top Label")); add(new JCenterLabel(UIManager.getIcon("OptionPane.informationIcon"))); add(new JCenterLabel("Bottom Label")); } } private static final class JCenterLabel extends JLabel { private static final long serialVersionUID = 5502066664726732298L; public JCenterLabel(final String s) { super(s); setAlignmentX(Component.CENTER_ALIGNMENT); } public JCenterLabel(final Icon i) { super(i); setAlignmentX(Component.CENTER_ALIGNMENT); } } }

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  • Productivity research material

    - by Rune FS
    While debating which platform to use for what applications (specifically we debated c++, java, c# and f#) we tried finding scientific quality research on productivity (cost of ownership really) of similar applications build on various platforms/using the above mentioned languages. Any one know of such research?

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  • How does volatile actually work?

    - by FredOverflow
    Marking a variable as volatile in Java ensures that every thread sees the value that was last written to it instead of some stale value. I was wondering how this is actually achieved. Does the JVM emit special instructions that flush the CPU cashes or something?

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  • Transaction Management

    - by Senthilnathan
    Hi all, In my code I am updating two table, one after the other. update(table1_details); update(table2_details); So if the update fails in table1 , table2 should not be updated or should be rolled back. How to handle this situation. I know I have to use transaction. Can some one help with code !!! I am using Java with spring and hibernate .

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  • Extract text from PDF (google app engine)

    - by Miroslav Bajtoš
    Is there any free Java library for extracting text from PDF, that is compatible with Google Application Engine? I've read about PDFJet, but it can't read PDF, can it? Is there perhaps other way how to extract text from PDF? I tried http://www.pdfdownload.org/, unfortunately they don't handle non-English characters correctly.

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  • Parsing plain text to some structured object

    - by Jeriho
    I am working on parsing plain text and converting it to key-value pairs. For example, plain text: some_uninteresting_thing key1 valueA, valueB, valueC key2 valueD key3 valueE valueF key4 valueG(valueH, valueI) key5 some_uninteresting_thing valueJ some_uninteresting_thing key6 some_uninteresting_thing (key6 shouldn't be mapped because has no appropriate values) As you can see plain text is lenient. What java library can handle this? If no such library exist, any suggestions on algorithm to do this.

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  • need to separate words from an image

    - by user298295
    how can i manipulate pixel values of a loaded image then save portion of that image into a new image(1 image per word).i found several example regarding saving or loading image but i cant understand how can i save image portion???i am trying to do it with java

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  • What is the best way to use whitespace while programming?

    - by Emmanuel Smith
    I'm fairly new to programming and from learning I have seen different ways of formatting code, comments, etc; and have been recommended on different techniques. I mostly program in C#, C++, and Java so I want to know what is the the best way to layout code so that if other people where to go through it, they would be impressed by how simple and easy to understand it is. I would like to know the same thing for commenting as well.

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  • Is it possible to access a running instance of an app using JNA/JNI?

    - by Carlos Blanco
    I'm writing a test engine for a Java application that has some of the code written in C. This application uses JNI to access it's native part. In the engine I'm writing, I use Fest to control de UI and perform the tests. However, I,m blind when dealing with the part that is written in C. I wonder if I can use JNA or JNI to access the native part of the app. I believe that the fact that the application is already running is huge issue here.

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  • Facebook Open Graph under a constrained application

    - by Hellnar
    Hello For an embedded system with internet (which works under a set-top box) I want to develop a primitive Facebook interface where users can type their user-names and password, showing their latest notificationsa, messages and other casual stuff via the recent Facebook Graph API. This middleware program uses Java ME to run programs (such as this simple facebook app) and it can connect to internet however it doesn't have a real web browser. Under this circumstance, is it possible to achieve such Facebook application? If you think so, what approach would you suggest ? Thanks

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  • Problem in using j2me polish with netbeans

    - by learn
    I have downloaded and installed the j2me polish successfully and i have tried to create the project but there is a reference problem showing that the specified folder does not contain the java platform but it is successfully working with normal project instead of polish which LWUIT to use?

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  • Does a HashMap retain the order of its elements on the next read if it is constructed as a LinkedHas

    - by javanix
    Suppose I have a Java method that returns a HashMap object. Because a LinkedHashMap is a subclass of HashMap, I can return a LinkedHashMap from this method just fine. On the next "read" action (no adding/removing/modifying of K/V pairs), would iterating over the keys of the resulting method (which returns a HashMap) go in the same order as the originating LinkedHashMap, even though the HashMap lacks the key links?

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  • Write a PLIST file in Groovy

    - by Joe Cannatti
    I have a Groovy application for Windows and am trying to convert a Hash object to an Apple plist file. What is the best way to go about this? Seems like this is something that must already be solved in Java but I can't seem to find any examples. Thanks in advance

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