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About Angex

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  1. Angex

    JTextField Overrides KeyListener

    If you only want to know when the enter key is pressed, you can use an action listener instead. There is a good exmaple in the Oracle documentation.   In a nut-shell it's: final JTextField textField = new JTextField(20); textField.addActionListener( new ActionListener() { @Override public void actionPerformed(final ActionEvent evt) { // Enter pressed. } } ); If you do need to capture other key strokes, consider using a DocumentListener. KeyListeners can be troublesome when the registered component doesn't have focus.
  2. I can't see anything wrong with your OpenGL setup. I even tried running your sample code on my phone, and it works okay.   Do you get any runtime errors? Does the device support OpenGl ES 2? Maybe try ES 1 and see if it works.   Are you using any other threads? It's possible the flow of execution is stuck some where else in the code.
  3. In the validateLog() method, the prepared statement only has 2 placeholders, but you're supplying data to indices 2 & 3.   The index for placeholders starts from 1
  4. Are you using 64bit version of Eclipse & Java VM?   It looks like Slick2D is trying to load 32bit native dll's.   LWJGL does provide 64bit builds; but you will probably need to modify your Slick2D build to load them.
  5. Angex

    method undefined by arraylist

    You can use "List.get(...)", to return the element at a given index in the ArrayList. [source lang="java"] for(int i = 0; i < BRICKS.size(); i++) { BRICKS.get(i).paintBrick(g); } [/source] Generic collections can also take advantage of the For-Each loop. E.g. [source lang="java"] for (final Brick b : BRICKS) { b.paintBrick(g); } [/source]
  6. Angex

    setting up swingworker

    Sorry I didn't check the code compiled properly. Make sure to include an import statement for the PropertyChangeListener import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; Also SwingWorker.get(), declares some checked exceptions so it needs to be inside a try-catch block. task.addPropertyChangeListener( new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent evt) { if (task.getState() == StateValue.DONE) { try { selectedFileHolder = task.get(); } catch (InterruptedException exp) { exp.printStackTrace(); } catch (ExecutionException exp) { exp.printStackTrace(); } } } } );
  7. Angex

    setting up swingworker

    First thing is to fix the generic parameters used by the SwingWorker. It should be SwingWorker< "Result Type", "Publish Type" > "Result Type" is the class of the final result we want from running this task. "Publish Type" is the class encapsulating data we're going to send to GUI components. In this case, the result we want is convertedFile; which is a File. ("Result Type"). The data we want to send to the UI (JTextArea) is counter, which is an int. ("Publish Type). NB: Java Generics can't use primitive types directly, instead must use their equivalent wrapper class. e.g. class FileProcessor extends SwingWorker<File, Integer> In the constructor of FileProcessor, you need to store the object reference to "INPUT" as an instance variable to be used later by "doInBackground()". See next answer This can be done using "publish/process" methods of SwingWorker. First you also need to store an object reference to the JTextArea. The complete constructor will look something like this: private File INPUT; private JTextArea innerTextArea; FileProcessor(File INPUT, JTextArea innerTextArea) { //initialize this.INPUT = INPUT; this.innerTextArea = innerTextArea; } Next, whenever counter is changed; you pass it's new value to the publish method. e.g. while(somecondition==condition) { //processing stuff counter++; publish( counter ); // Tell the GUI about counter. } Finally, override the "process" method which receives the new counter values. Notice that process gets a list of all pending values; rather than been invoked once per publish. e.g. @Override protected void process(List<Interger> chunks) { for (Integer i : chunks) { innerTextArea.append("counter = " + i + "\n"); } } There are at least 3 differrent ways todo this. The best way depends on what you want to do with "convertedFile". 1. The simplest is to use "get" method of SwingWorker. But this will block the current thread until the SwingWorker is finished. (You probably don't want that!). e.g. FileProcessor task = new FileProcessor(selectedFile, outerTextArea); task.execute(); selectedFileHolder = task.get(); 2. You can make FileProcessor an inner class of X, override the "done()" method of SwingWorker. e.g. @Override protected void done() { selectedFileHolder = get(); } 3. You can add a "PropertyChangeListener" to the SwingWorker, and wait to be notified it's finished. e.g. final FileProcessor task = new FileProcessor(selectedFile, outerTextArea); task.addPropertyChangeListener( new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent evt) { if (task.getState() == StateValue.DONE) { selectedFileHolder = task.get(); } } } ); task.execute();
  8. Angex

    signing jar files

    Jarsigner itself should be found at: [JDK Dir]/Bin/jarsigner.exe It's a command line tool you will have to run from a DOS prompt. I couldn't explain it better than the offical docs: http://docs.oracle.com/javase/1.5.0/docs/tooldocs/solaris/jarsigner.html There are some plugins available for Eclipse to help with this; that provide a wrapper to jarsigner. I've seen a couple on SourceForge.
  9. I can only think of a few reasons why the compiler can't resolve a type. 1) The compiler can't find the class "java.io.File". Check to make sure the java libraries are referenced by the project. In "Package Explorer", right-click the project and select "Properties". Then click "Java Build Path", then "Libraries" tab. In the list you should have something like "JRE System Library". (Names may vary depending on the version of Eclipse). If missing, then it needs to be added. 2) There are multiple classes with the same name. Your project has another class called File, and the compiler doesn't know which File you mean. Looking at the imports, this doesn't seem to be the case. But double check there are no other classes in the same package called File, or inner classes. If you do have multiple classes with the same name, you just need to specify the full package name when using them e.g. java.io.File selectedFileBamHolder; 3) There is a syntax error somewhere else in the code; the compiler has generated misleading errors. The compiler has encountered a File variable declaration when it didn't expect too. In isolation, the code causing the error looks okay. Usually this is caused by a mis-placed bracket somewhere else in the code.
  10. Well it looks like most errors are because the compiler doesn't know about the type "File". Have you got an import statement for "java.io.File" or "java.io.*" ? If so, there must be a syntax error somewhere else in the code. For the "doWork" method, if you need to access without an instance of BamToBed, make sure to declare the method static. In BamToBed class it should read: public static File doWork(File f) { // Do something... return null; } For "Duplicate local variable selectedFile", you declare a "File" variable twice with the same name. If you want to replace selectedFile with selectedFileBamHolder, just do: selectedFile = selectedFileBamHolder // Instead of: // File selectedFile = selectedFileBamHolder; Otherwise it needs a different name.
  11. Angex

    Problem with Background (JAVA)

    The "paint()" method you've implemented is overriding the paint of the JFrame. So when the window is rendered, you're telling it to draw a red box. In this case I think it would be better to override paintComponent, as this won't interfere with the draw order of the container and child components. You need todo something like this, but there are many other ways: private JPanel panel = new JPanel() { public void paintComponent(Graphics g) { g.setColor(Color.RED); g.drawRect(20, 50, 100, 100); } }; The extra braces create an anonymous class which extends JPanel and overrides it's paintComponent method. Also if you're relying on Swing to draw everything, don't call any paints directly from your own code (Unless for buferring). Use something like repaint(), to request a render. E.g. You have "panel.paint(null);" in the constructor. This is very bad, it won't work correctly and will cause lots of bugs. Assuming you avoid the NullPointerException; do some research on the "AWT Event dispatch thread". In the future you may want to consider "Active Rendering". I only mention it because someone else usually does anyway
  12. You can only use the "set(...)" method to replace an existing element. It will not add a new element. The value you specify as the index must be >= 0 and < size. NB: Size, is the number of elements in the list, not the capacity. You cannot do this either: ArrayList<String> list = new ArrayList<String>( 10 ); list.set(5, "Hello"); // Will throw an exception!
  13. Angex

    JNI Linking

    The VM does not automatically search the working directory or environment directories. You have to specify the the path(s) to native libraries. It should work relative to the working directory though, so try running you java app using: java -Djava.library.path=./ HelloWorld
  14. Angex

    [java] Exporting jar.

    Have you verified the class files have been exported and put into the correct structure? From the root of the jar, is there a "slickGame.src.MainClass.class"?
  15. You can have nested Interfaces, the same as nested classes. The Interface isn't returning an anonymous type, it is the "anonymous" type. Although I think your IDE has incorrectly labeled it anonymous ?? Becuase of the dot notation used in Android. The standard JVM uses $.
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