public fields - Page 254

Identify high CPU consumed thread for Java app

- by Vincent Ma

Following java code to emulate busy and Idle thread and start it. import java.util.concurrent.*;import java.lang.*; public class ThreadTest { public static void main(String[] args) { new Thread(new Idle(), "Idle").start(); new Thread(new Busy(), "Busy").start(); }}class Idle implements Runnable { @Override public void run() { try { TimeUnit.HOURS.sleep(1); } catch (InterruptedException e) { } }}class Busy implements Runnable { @Override public void run() { while(true) { "Test".matches("T.*"); } }} Using Processor Explorer to get this busy java processor and get Thread id it cost lots of CPU see the following screenshot: Cover to 4044 to Hexadecimal is oxfcc. Using VistulVM to dump thread and get that thread. see the following screenshot In Linux you can use top -H to get Thread information. That it! Any question let me know. Thanks

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How to handle sorting of complex objects?

- by AedonEtLIRA

How would one sort a list of objects that have more than one sortable element? Suppose you have a simple object Car and car is a defined as such: class Car { public String make; public String model; public int year; public String color; // ... No methods, just a structure / container } I designed a simple framework that would allow for multiple SortOptions to be provided to a Sorter that would then sort the list. interface ISorter<T> { List<T> sort(List<T> items); void addSortOption(ISortOption<T> option); ISortOption<T>[] getSortOptions(); void setSortOption(ISortOption<T> option); } interface ISortOption<T> { String getLabel(); int compare(T t1, T t2); } Example use class SimpleStringSorter extends MergeSorter<String> { { addSorter(new AlphaSorter()); } private static final class AlphaSorter implements ISortOption<String> { // ... implementation of alpha compare and get label } } The issue with this solution is that it is not easily expandable. If car was to ever receive a new field, say, currentOwner. I would need to add the field, then track down the sorter class file, implement a new sort option class then recompile the application for redistribution. Is there an easier more expandable/practical way to sort data like this?

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Gathering IP address and workstation information; does it belong in a state class?

- by p.campbell

I'm writing an enterprisey utility that collects exception information and writes to the Windows Event Log, sends an email, etc. This utility class will be used by all applications in the corporation: web, BizTalk, Windows Services, etc. Currently this class: holds state given to it via public properties calls out to .NET Framework methods to gather information about runtime details. Included are call to various properties and methods from System.Environment, Reflection details, etc. This implementation has the benefit of allowing all those callers not to have to make these same calls themselves. This means less code for the caller to forget, screw up, etc. Should this state class (please what's the phrase I'm looking for [like DTO]?) know how to resolve/determine runtime details (like the IP address and machine name that it's running on)? It seems to me on second thought that it's meant to be a class that should hold state, and not know how to call out to the .NET Framework to find information. var myEx = new AppProblem{MachineName="Riker"}; //Will get "Riker 10.0.0.1" from property MachineLongDesc Console.WriteLine("full machine details: " + myEx.MachineLongDesc); public class AppProblem { public string MachineName{get;set;} public string MachineLongDesc{ get{ if(string.IsNullOrEmpty(this.MachineName) { this.MachineName = Environment.MachineName; } return this.MachineName + " " + GetCurrentIP(); } } private string GetCurrentIP() { return System.Net.Dns.GetHostEntry(this.MachineName) .AddressList.First().ToString(); } } This code was written by hand from memory, and presented for simplicity, trying to illustrate the concept.

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Android 2D terrain scrolling

- by Nikola Ninkovic

I want to make infinite 2D terrain based on my algorithm.Then I want to move it along Y axis (to the left) This is how I did it : public class Terrain { Queue<Integer> _bottom; Paint _paint; Bitmap _texture; Point _screen; int _numberOfColumns = 100; int _columnWidth = 20; public Terrain(int screenWidth, int screenHeight, Bitmap texture) { _bottom = new LinkedList<Integer>(); _screen = new Point(screenWidth, screenHeight); _numberOfColumns = screenWidth / 6; _columnWidth = screenWidth / _numberOfColumns; for(int i=0;i<=_numberOfColumns;i++) { // Generate terrain point and put it into _bottom queue } _paint = new Paint(); _paint.setStyle(Paint.Style.FILL); _paint.setShader(new BitmapShader(texture, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT)); } public void update() { _bottom.remove(); // Algorithm calculates next point _bottom.add(nextPoint); } public void draw(Canvas canvas) { Iterator<Integer> i = _bottom.iterator(); int counter = 0; Path path = new Path(); path.moveTo(0, _screen.y); while (i.hasNext()) { path.lineTo(counter, _screen.y-i.next()); counter += _columnWidth; } path.lineTo(_screen.x, _screen.y); path.lineTo(0, _screen.y); canvas.drawPath(path2, _paint); } } The problem is that the game is too 'fast', so I tried with pausing thread with Thread.sleep(50); in run() method of my game thread but then it looks too torn. Well, is there any way to slow down drawing of my terrain ?

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Is writing recursive functions hard for you?

- by null

I'm taking a computer science course now. I feel it is so hard compared to my polytechnic IT course. I can't understand recursive methods well. How do you manage to get your brain to understand it? When the recursive method returns back, my brain can not trace it nicely. Is there a better way to understand recursion? How do you start learning it? Is it normal that feel that it is very hard at then beginning? Look at the example, I'm very surprised how can I write this if it appears in exam. public class Permute { public static void main(String[] args) { new Permute().printPerms(3); } boolean[] used; int max; public void printPerms(int size) { used = new boolean[size]; max = size; for (int i = 0; i < size; i++) { used[i] = false; } perms(size, ""); } public void perms(int remaining, String res) { if (remaining == 0) { System.out.println(res); } else { for (int i = 0; i < max; i++) { if (!(used[i])) { used[i] = true; perms(remaining - 1, res + " " + i); used[i] = false; } } } } }

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Handling game logic events by behavior components

- by chehob

My question continues on topic discussed here I have tried implementing attribute/behavior design and here is a quick example demonstrating the issue. class HealthAttribute : public ActorAttribute { public: HealthAttribute( float val ) : mValue( val ) { } float Get( void ) const { return mValue; } void Set( float val ) { mValue = val; } private: float mValue; }; class HealthBehavior : public ActorBehavior { public: HealthBehavior( shared_ptr< HealthAttribute > health ) : pHealth( health ) { // Set OnDamage() to listen for game logic event "DamageEvent" } void OnDamage( IEventDataPtr pEventData ) { // Check DamageEvent target entity // ( compare my entity ID with event's target entity ID ) // If not my entity, do nothing // Else, modify health attribute with received DamageEvent data } protected: shared_ptr< HealthAttribute > pHealth; }; My question - is it possible to get rid of this annoying check for game logic events? In the current implementation when some entity must receive damage, game logic just fires off event that contains damage value and the entity id which should receive that damage. And all HealthBehaviors are subscribed to the DamageEvent type, which leads to any entity possesing HealthBehavior call OnDamage() even if he is not the addressee.

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Java game design question (graphical objects)

- by vemalsar

Hello Guys, I'm beginner in game development, in Java and here on this site too and I have a game design question. Please comment my idea: I have a main loop which call update and draw method. I want to use an ArrayList which store graphical objects, they have coordinate and image or text to draw and my game objects extends this class. In update, I can choose which objects should be put in the array and in draw method I'll display the elements of array on the screen. I'm using a buffer and draw first there, but it is not important now I guess...Here is a simple (not full) code, only the logic: public class GamePanel extends JPanel implements KeyListener { ArrayList<graphicalObjects> graphArray = new ArrayList<graphicalObjects>(); public void update() { //change the game scene, update the graphArray, process input etc. } public void draw() { //draws every element of graphArray to a JPanel } public static main(String[] args) { while(true) { update(); draw(); } } } My questions: Should have I use interface or abstract class for graphicalObjects? graphicalObjects class and the ArrayList really needs or there is some better solution? How to draw objects? They draw themself with their own method or in the draw method I have to draw manually based on graphicalObjects variables (x,y coordinates, image etc.)? If this conception is wrong, please suggest another one! All comments are welcome and sorry if this is dumb question, thanks!

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HTML Tidy in NetBeans IDE (Part 2)

- by Geertjan

This is what I was aiming for in the previous blog entry: What you can see above (especially if you click to enlarge it) is that I have HTML Tidy integrated into the NetBeans analyzer functionality, which is pluggable from 7.2 onwards. Well, if you set an implementation dependency on "Static Analysis Core", since it's not an official API yet. Also, the scopes of the analyzer functionality are not pluggable. That means you can 'only' set the analyzer's scope to one or more projects, one or more packages, or one or more files. Not one or more folders, which means you can't have a bunch off HTML files in a folder that you access via the Favorites window and then run the analyzer on that folder (or on multiple folders). Thus, to try out my new code, I had to put some HTML files into a package inside a Java application. Then I chose that package as the scope of the analyzer. Then I ran all the analyzers (i.e., standard NetBeans Java hints, FindBugs, as well as my HTML Tidy extension) on that package. The screenshot above is the result. Here's all the code for the above, which is a port of the Action code from the previous blog entry into a new Analyzer implementation: import java.io.IOException; import java.io.PrintWriter; import java.io.StringWriter; import java.util.ArrayList; import java.util.Collections; import java.util.List; import javax.swing.JComponent; import javax.swing.text.Document; import org.netbeans.api.fileinfo.NonRecursiveFolder; import org.netbeans.modules.analysis.spi.Analyzer; import org.netbeans.modules.analysis.spi.Analyzer.AnalyzerFactory; import org.netbeans.modules.analysis.spi.Analyzer.Context; import org.netbeans.modules.analysis.spi.Analyzer.CustomizerProvider; import org.netbeans.modules.analysis.spi.Analyzer.WarningDescription; import org.netbeans.spi.editor.hints.ErrorDescription; import org.netbeans.spi.editor.hints.ErrorDescriptionFactory; import org.netbeans.spi.editor.hints.Severity; import org.openide.cookies.EditorCookie; import org.openide.filesystems.FileObject; import org.openide.loaders.DataObject; import org.openide.util.Exceptions; import org.openide.util.lookup.ServiceProvider; import org.w3c.tidy.Tidy; public class TidyAnalyzer implements Analyzer { private final Context ctx; private TidyAnalyzer(Context cntxt) { this.ctx = cntxt; } @Override public Iterable<? extends ErrorDescription> analyze() { List<ErrorDescription> result = new ArrayList<ErrorDescription>(); for (NonRecursiveFolder sr : ctx.getScope().getFolders()) { FileObject folder = sr.getFolder(); for (FileObject fo : folder.getChildren()) { for (ErrorDescription ed : doRunHTMLTidy(fo)) { if (fo.getMIMEType().equals("text/html")) { result.add(ed); } } } } return result; } private List<ErrorDescription> doRunHTMLTidy(FileObject sr) { final List<ErrorDescription> result = new ArrayList<ErrorDescription>(); Tidy tidy = new Tidy(); StringWriter stringWriter = new StringWriter(); PrintWriter errorWriter = new PrintWriter(stringWriter); tidy.setErrout(errorWriter); try { Document doc = DataObject.find(sr).getLookup().lookup(EditorCookie.class).openDocument(); tidy.parse(sr.getInputStream(), System.out); String[] split = stringWriter.toString().split("\n"); for (String string : split) { //Bit of ugly string parsing coming up: if (string.startsWith("line")) { final int end = string.indexOf(" c"); int lineNumber = Integer.parseInt(string.substring(0, end).replace("line ", "")); string = string.substring(string.indexOf(": ")).replace(":", ""); result.add(ErrorDescriptionFactory.createErrorDescription( Severity.WARNING, string, doc, lineNumber)); } } } catch (IOException ex) { Exceptions.printStackTrace(ex); } return result; } @Override public boolean cancel() { return true; } @ServiceProvider(service = AnalyzerFactory.class) public static final class MyAnalyzerFactory extends AnalyzerFactory { public MyAnalyzerFactory() { super("htmltidy", "HTML Tidy", "org/jtidy/format_misc.gif"); } public Iterable<? extends WarningDescription> getWarnings() { return Collections.EMPTY_LIST; } @Override public <D, C extends JComponent> CustomizerProvider<D, C> getCustomizerProvider() { return null; } @Override public Analyzer createAnalyzer(Context cntxt) { return new TidyAnalyzer(cntxt); } } } The above only works on packages, not on projects and not on individual files.

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Interface (contract), Generics (universality), and extension methods (ease of use). Is it a right design?

- by Saeed Neamati

I'm trying to design a simple conversion framework based on these requirements: All developers should follow a predefined set of rules to convert from the source entity to the target entity Some overall policies should be able to be applied in a central place, without interference with developers' code Both the creation of converters and usage of converter classes should be easy To solve these problems in C# language, A thought came to my mind. I'm writing it here, though it doesn't compile at all. But let's assume that C# compiles this code: I'll create a generic interface called IConverter public interface IConverter<TSource, TTarget> where TSource : class, new() where TTarget : class, new() { TTarget Convert(TSource source); List<TTarget> Convert(List<TSource> sourceItems); } Developers would implement this interface to create converters. For example: public class PhoneToCommunicationChannelConverter : IConverter<Phone, CommunicationChannle> { public CommunicationChannel Convert(Phone phone) { // conversion logic } public List<CommunicationChannel> Convert(List<Phone> phones) { // conversion logic } } And to make the usage of this conversion class easier, imagine that we add static and this keywords to methods to turn them into Extension Methods, and use them this way: List<Phone> phones = GetPhones(); List<CommunicationChannel> channels = phones.Convert(); However, this doesn't even compile. With those requirements, I can think of some other designs, but they each lack an aspect. Either the implementation would become more difficult or chaotic and out of control, or the usage would become truly hard. Is this design right at all? What alternatives I might have to achieve those requirements?

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Interfaces on an abstract class

- by insta

My coworker and I have different opinions on the relationship between base classes and interfaces. I'm of the belief that a class should not implement an interface unless that class can be used when an implementation of the interface is required. In other words, I like to see code like this: interface IFooWorker { void Work(); } abstract class BaseWorker { ... base class behaviors ... public abstract void Work() { } protected string CleanData(string data) { ... } } class DbWorker : BaseWorker, IFooWorker { public void Work() { Repository.AddCleanData(base.CleanData(UI.GetDirtyData())); } } The DbWorker is what gets the IFooWorker interface, because it is an instantiatable implementation of the interface. It completely fulfills the contract. My coworker prefers the nearly identical: interface IFooWorker { void Work(); } abstract class BaseWorker : IFooWorker { ... base class behaviors ... public abstract void Work() { } protected string CleanData(string data) { ... } } class DbWorker : BaseWorker { public void Work() { Repository.AddCleanData(base.CleanData(UI.GetDirtyData())); } } Where the base class gets the interface, and by virtue of this all inheritors of the base class are of that interface as well. This bugs me but I can't come up with concrete reasons why, outside of "the base class cannot stand on its own as an implementation of the interface". What are the pros & cons of his method vs. mine, and why should one be used over another?

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Who extends interfaces? And why?

- by Gangnus

AFAIK, my class extends parent classes and implements interfaces. But I run across a situation, where I can't use implements SomeInterface. It is the declaration of a generic types. For example: public interface CallsForGrow {...} public class GrowingArrayList <T implements CallsForGrow> // BAD, won't work! extends ArrayList<T> Here using implements is syntactically forbidden. I thought first, that using interface inside < is forbidden at all, but no. It is possible, I only have to use extends instead of implements. As a result, I am "extending" an interface. This another example works: public interface CallsForGrow {...} public class GrowingArrayList <T extends CallsForGrow> // this works! extends ArrayList<T> To me it seems as a syntactical inconsistancy. But maybe I don't understand some finesses of Java 6? Are there other places where I should extend interfaces? Should the interface, that I mean to extend, have some special features?

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Help with design structure choice: Using classes or library of functions

- by roverred

So I have GUI Class that will call another class called ImageProcessor that contains a bunch functions that will perform image processing algorithms like edgeDetection, gaussianblur, contourfinding, contour map generations, etc. The GUI passes an image to ImageProcessor, which performs one of those algorithm on it and it returns the image back to the GUI to display. So essentially ImageProcessor is a library of independent image processing functions right now. It is called in the GUI like so Image image = ImageProcessor.EdgeDetection(oldImage); Some of the algorithms procedures require many functions, and some can be done in a single function or even one line. All these functions for the algorithms jam packed into ImageProcessor can be pretty messy, and ImageProcessor doesn't sound it should be a library. So I was thinking about making every algorithm be a class with a shared interface say IAlgorithm. Then I pass the IAlgorithm interface from the GUI to the ImageProcessor. public interface IAlgorithm{ public Image Process(); } public class ImageProcessor{ public Image Process(IAlgorithm TheAlgorithm){ return IAlgorithm.Process(); } } Calling in the GUI like so Image image = ImageProcessor.Process(new EdgeDetection(oldImage)); I think it makes sense in an object point of view, but the problem is I'll end up with some classes that are just one function. What do you think is a better design, or are they both crap and you have a much better idea? Thanks!

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Showing an Action on a TopComponent Node

- by Geertjan

Let's say you want to extend the tools in NetBeans IDE, specifically for TopComponents. When the user right-clicks in the Projects window (or Files window or Favorites window) on a Java class that extends TopComponent, a menu item should be available for branding the TopComponent. What "branding" entails is, at this stage, a secondary question. The primary question, from an implementation point of view, is "how do I create an action that is only shown when the user right-clicks on a TopComponent?" Here's the solution, in NetBeans IDE 7.2 (the "lazy" attribute, here set to false, is new in 7.2): import com.sun.source.tree.ClassTree; import com.sun.source.util.TreePathScanner; import java.awt.event.ActionEvent; import java.io.IOException; import javax.lang.model.element.Element; import javax.lang.model.element.TypeElement; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JOptionPane; import org.netbeans.api.java.source.CompilationController; import org.netbeans.api.java.source.CompilationInfo; import org.netbeans.api.java.source.JavaSource; import org.netbeans.api.java.source.JavaSource.Phase; import org.netbeans.api.java.source.Task; import org.openide.awt.ActionID; import org.openide.awt.ActionReference; import org.openide.awt.ActionReferences; import org.openide.awt.ActionRegistration; import org.openide.awt.DynamicMenuContent; import org.openide.loaders.DataObject; import org.openide.util.ContextAwareAction; import org.openide.util.Exceptions; import org.openide.util.Lookup; import org.openide.util.NbBundle.Messages; import org.openide.util.Utilities; @ActionID( category = "Tools", id = "org.tc.customizer.BrandTopComponentAction") @ActionRegistration( displayName = "#CTL_BrandTopComponentAction", lazy = false) @ActionReferences({ @ActionReference(path = "Loaders/text/x-java/Actions", position = 150) }) @Messages("CTL_BrandTopComponentAction=Brand") public final class BrandTopComponentAction extends AbstractAction implements ContextAwareAction { private final DataObject dobj; public BrandTopComponentAction() { this(Utilities.actionsGlobalContext()); } public BrandTopComponentAction(Lookup context) { super(Bundle.CTL_BrandTopComponentAction()); this.dobj = context.lookup(DataObject.class); //Enable the menu item only if we're dealing with a TopComponent JavaSource javaSource = JavaSource.forFileObject(dobj.getPrimaryFile()); try { javaSource.runUserActionTask(new ScanForTopComponentTask(this), true); } catch (IOException ex) { Exceptions.printStackTrace(ex); } //Hide the menu item if it isn't enabled: putValue(DynamicMenuContent.HIDE_WHEN_DISABLED, true); } @Override public void actionPerformed(ActionEvent ev) { JOptionPane.showMessageDialog(null, "Hurray, I am a TopComponent!"); //Now add your code for showing a dialog, //where the dialog will display UI for branding the TopComponent somehow //and retrieve those branding values //and then change the TopComponent class accordingly. } @Override public Action createContextAwareInstance(Lookup actionContext) { return new BrandTopComponentAction(actionContext); } private static class ScanForTopComponentTask implements Task<CompilationController> { private final BrandTopComponentAction action; private ScanForTopComponentTask(BrandTopComponentAction action) { this.action = action; } @Override public void run(CompilationController compilationController) throws Exception { compilationController.toPhase(Phase.ELEMENTS_RESOLVED); new MemberVisitor(compilationController, action).scan( compilationController.getCompilationUnit(), null); } } private static class MemberVisitor extends TreePathScanner<Void, Void> { private CompilationInfo info; private final AbstractAction action; public MemberVisitor(CompilationInfo info, AbstractAction action) { this.info = info; this.action = action; } @Override public Void visitClass(ClassTree t, Void v) { Element el = info.getTrees().getElement(getCurrentPath()); if (el != null) { TypeElement te = (TypeElement) el; if (te.getSuperclass().toString().equals("org.openide.windows.TopComponent")){ action.setEnabled(true); } else { action.setEnabled(false); } } return null; } } } The code above is the result of combining various tutorials found on the NetBeans Platform Learning Trail.

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LibGDX onTouch() method kill on touch

- by johnny-b

How can I add this on my application. i want to use the onTouch() method from the implementation of the InputProcessor to kill the enemies on screen. how do i do that? do i have to do anything to the enemy class? please help Thank you M @Override public boolean touchDown(int screenX, int screenY, int pointer, int button) { return false; } here is my enemy class public class Bullet extends Sprite { private Vector2 velocity; private float lifetime; public Bullet(float x, float y) { velocity = new Vector2(0, 0); } public void update(float delta) { float targetX = GameWorld.getBall().getX(); float targetY = GameWorld.getBall().getY(); float dx = targetX - getX(); float dy = targetY - getY(); float distToTarget = (float) Math.sqrt(dx * dx + dy * dy); velocity.x += dx * delta; velocity.y += dy * delta; } } i am rendering all graphics in a GameRender class and a gameworld class if you need more info please let me know Thank you

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The better way to ask for input?

- by Skippy

I am wondering which is the best way to go with java code. I need to create a class with simple prompts for input.. I have tried using both classes and cannot work out the particular benefits for each. Is this because I am still in the early stages of programming or are there situations that will occur as it becomes more complex?? import java.util.Scanner; public class myClass { Scanner stdin = new Scanner(System.in); public String getInput(String prompt) { System.out.print(prompt); return stdin.nextLine(); } ... or import java.io.*; public class myClass { public static void main(String[] args) throws IOException { BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in)); System.out.print("Input something: "); String name = stdin.readLine(); I know these examples are showing different methods within these classes, but thought this might serve well for the discussion. I'm really not sure which site is the best to ask this on.

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Use constructor or setter method?

- by user633600

I am working on a UI code where I have an Action class, something like this - public class MyAction extends Action { public MyAction() { setText("My Action Text"); setToolTip("My Action Tool tip"); setImage("Some Image"); } } When this Action class was created it was pretty much assumed that the Action class wont be customizable (in a sense- its text, tooltip or image will be not be changed anywhere in the code). Of late, now we are in need of changing the action text at some location in code. So I suggested my co-worker to remove the hardcoded action text from the constructor and accept it as an argument, so that everybody is forced to pass the action text. Something like this code below - public class MyAction extends Action { public MyAction(String actionText) { setText(actionText); setTooltip("My Action tool tip); setImage("My Image"); } } He however thinks that since setText() method belongs to base class. It can be flexibly used to pass the action text wherever action instance is created. That way, there is no need to change the existing MyAction class. So his code would look something like this. MyAction action = new MyAction(); //this creates action instance with the hardcoded text action.setText("User required new action text"); //overwrite the exisitng text. I am not sure if that is a correct way to deal with problem. I think in above mentioned case user is anyway going to change the text, so why not force him while constructing the action. The only benefit I see with the original code is that user can create Action class without much thinking about setting text.

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Which jar has JBox2d's p5 package

- by Brantley Blanchard

Using eclipse, I'm trying to write a simple hello world program in processing that simply draws a rectangle on the screen then has gravity drop it as seen in this Tutorial. The problem is that when I try to import the p5 package, it's not resolving so I can't declare my Physics object. I tried two things. Download the zip, unzip it, then import the 3 jars (library, serialization, & testbed) a. import org.jbox2d.p5.*; doesn't resolve but the others do b. Physics physics; doesn't resolve Download the older standalone testbed jar then import it a. Physics physics; doesn't resolve; Here is basically where I'm starting import org.jbox2d.util.nonconvex.*; import org.jbox2d.dynamics.contacts.*; import org.jbox2d.testbed.*; import org.jbox2d.collision.*; import org.jbox2d.common.*; import org.jbox2d.dynamics.joints.*; import org.jbox2d.p5.*; import org.jbox2d.dynamics.*; import processing.core.PApplet; public class MyFirstJBox2d extends PApplet { Physics physics; public void setup() { size(640,480); frameRate(60); initScene(); } public void draw() { background(0); if (keyPressed) { //Reset everything physics.destroy(); initScene(); } } public void initScene() { physics = new Physics(this, width, height); physics.setDensity(1.0f); physics.createRect(300,200,340,300); } }

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JavaFX: Use a Screen with your Scene!

- by user12610255

Here's a handy tip for sizing your application. You can use the javafx.stage.Screen class to obtain the width and height of the user's screen, and then use those same dimensions when sizing your scene. The following code modifies default "Hello World" application that appears when you create a new JavaFX project in NetBeans. package screendemo; import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.stage.Stage; import javafx.stage.Screen; import javafx.geometry.Rectangle2D; public class ScreenDemo extends Application { public static void main(String[] args) { Application.launch(args); } @Override public void start(Stage primaryStage) { primaryStage.setTitle("Hello World"); Group root = new Group(); Rectangle2D screenBounds = Screen.getPrimary().getVisualBounds(); Scene scene = new Scene(root, screenBounds.getWidth(), screenBounds.getHeight()); Button btn = new Button(); btn.setLayoutX(100); btn.setLayoutY(80); btn.setText("Hello World"); btn.setOnAction(new EventHandler() { public void handle(ActionEvent event) { System.out.println("Hello World"); } }); root.getChildren().add(btn); primaryStage.setScene(scene); primaryStage.show(); } } Running this program will set the Stage boundaries to visible bounds of the main screen. -- Scott Hommel

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Are these 2 strings equal?

- by Shawn Cicoria

I spent way too many hours on this one. I was going through full configuration of ADFS v2 with WCF active client scenarios and using self generated certificates, had all things lined up perfectly. Using the certificate snap in I just copied the thumbprint into the IdentityModel section (trusted issuers) in my service config. var one = "?ecb8fd950978d94ae21d4f073227fdc2718bdb96"; var two = "ecb8fd950978d94ae21d4f073227fdc2718bdb96"; What ended up is in the first, there’s a buried nonprintable series of characters (â€Ž – or E2 80 8E in 0x format). 2 lessons, turn on tracing sooner and don’t trust Copy & Paste – all the time. I ended up creating a quick Issuer Name Registry class so I could debug and finally saw the issue. namespace MyService { public class IssuerValidator : ConfigurationBasedIssuerNameRegistry { public IssuerValidator() :base() { } public IssuerValidator(XmlNodeList xml) : base(xml) { } public override string GetIssuerName(System.IdentityModel.Tokens.SecurityToken securityToken) { X509SecurityToken token = securityToken as X509SecurityToken; if (token == null) { return "who cares"; } else { return token.Certificate.Thumbprint; } } } I do have a utility I wrote to navigate the cert store and emit the thumbprint to avoid these issues, I just didn’t have it available on my machine at the time.

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Interfaces: profit of using

- by Zapadlo

First of all, my ubiquitous language is PHP, and I'm thinking about learning Java. So let me split my question on two closely related parts. Here goes the first part. Say I have a domain-model class. It has some getters, setters, some query methods etc. And one day I want to have a possibility to compare them. So it looks like: class MyEntity extends AbstractEntity { public function getId() { // get id property } public function setId($id) { // set id property } // plenty of other methods that set or retrieve data public function compareTo(MyEntity $anotherEntity) { // some compare logic } } If it would have been Java, I should have implemented a Comparable interface. But why? Polymorphism? Readbility? Or something else? And if it was PHP -- should I create Comparable interface for myself? So here goes the second part. My colleague told me that it is a rule of thumb in Java to create an interface for every behavioral aspect of the class. For example, if I wanted to present this object as a string, I should state this behaviour by something like implements Stringable, where in case of PHP Stringable would look like: interface Stringable { public function __toString(); } Is that really a rule of thumb? What benefits are gained with this approach? And does it worth it in PHP? And in Java?

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Java single Array best choice for accessing pixels for manipulation?

- by Petrol

I am just watching this tutorial https://www.youtube.com/watch?v=HwUnMy_pR6A and the guy (who seems to be pretty competent) is using a single array to store and access the pixels of his to-be-rendered image. I was wondering if this really is the best way to do this. The alternative of Multi-Array does have one pointer more, but Arrays do have an O(1) for accessing each index and calculating the index in a single array seems to take one addition and one multiplication operation per pixel. And if Multi-Arrays really are bad, can't you use something with Hashing to avoid those addition and multiplication operations? EDIT: here is his code... public class Screen { private int width, height; public int[] pixels; public Screen(int width, int height) { this.width = width; this.height = height; // creating array the size of one index/int for every pixel // single array has better performance than multi-array pixels = new int[width * height]; } public void render() { for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { pixels[x + y * width] = 0xff00ff; } } } }

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How would I broadcast a subdomain/virtual name on a local server with people connected to the same network

- by Sarmen B.

I have a server connected to the router which has ubuntu 12.04. It is has apache/mysql/php all installed ready to go. the folder structure is like this: /var/www -- this isnt the root -/libs -/logs -/public - this is the root -/vhosts - all subdomains go here I have a folder in vhosts named mysite. I went into /etc/apache2/sites-available and created a file and here are the contents - (vhost file). and I also added an entry in /etc/hosts file containing: 127.0.1.1 mysite.dev and I also did sudo a2ensite mysite i tried accessing the site from a computer via mysite.dev and our public ip into the server but i was not able to view it. the public directory in the structure above does display on all computers when i try our public ip. but for anything added in vhosts the site wont show. there is no domain attached its just our ip. I tried changing the port from 80 to say 9999 in the mysite file in sites-available and tried myip:9999 but that didnt work either. what am I doing wrong? edit: i forgot to mention that the server is dmzed on the router.

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checkbox unchecked when i scroll listview in android

- by Mathew

I am new to android development. I created a listview with textbox and checkbox. When I check the checkbox and scroll it down to check some other items in the list view, the older ones are unchecked. How to avoid this problem in listview? Please guide me with my code. Here is the code: main.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/TextView01" android:layout_height="wrap_content" android:text="List of items" android:textStyle="normal|bold" android:gravity="center_vertical|center_horizontal" android:layout_width="fill_parent"></TextView> <ListView android:id="@+id/ListView01" android:layout_height="250px" android:layout_width="fill_parent"> </ListView> <Button android:text="Save" android:id="@+id/btnSave" android:layout_width="wrap_content" android:layout_height="wrap_content"> </Button> </LinearLayout> This is the xml page I used to create dynamic list row: listview.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:gravity="left|center" android:layout_width="wrap_content" android:paddingBottom="5px" android:paddingTop="5px" android:paddingLeft="5px"> <TextView android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:textColor="#FFFF00" android:text="hi"></TextView> <TextView android:text="hello" android:id="@+id/TextView02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10px" android:textColor="#0099CC"></TextView> <EditText android:id="@+id/txtbox" android:layout_width="120px" android:layout_height="wrap_content" android:textSize="12sp" android:layout_x="211px" android:layout_y="13px"> </EditText> <CheckBox android:id="@+id/chkbox1" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> This is my activity class. CustomListViewActivity.java: package com.listivew; import android.app.Activity; import android.os.Bundle; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class CustomListViewActivity extends Activity { ListView lstView; static Context mContext; Button btnSave; private static class EfficientAdapter extends BaseAdapter { private LayoutInflater mInflater; public EfficientAdapter(Context context) { mInflater = LayoutInflater.from(context); } public int getCount() { return country.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { final ViewHolder holder; if (convertView == null) { convertView = mInflater.inflate(R.layout.listview, parent, false); holder = new ViewHolder(); holder.text = (TextView) convertView .findViewById(R.id.TextView01); holder.text2 = (TextView) convertView .findViewById(R.id.TextView02); holder.txt = (EditText) convertView.findViewById(R.id.txtbox); holder.cbox = (CheckBox) convertView.findViewById(R.id.chkbox1); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.text.setText(curr[position]); holder.text2.setText(country[position]); holder.txt.setText(""); holder.cbox.setChecked(false); return convertView; } public class ViewHolder { TextView text; TextView text2; EditText txt; CheckBox cbox; } } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lstView = (ListView) findViewById(R.id.ListView01); lstView.setAdapter(new EfficientAdapter(this)); btnSave = (Button)findViewById(R.id.btnSave); mContext = this; btnSave.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // I want to print the text which is in the listview one by one. //Later i will insert it in the database // Toast.makeText(getBaseContext(), "EditText Value, checkbox value and other values", Toast.LENGTH_SHORT).show(); for (int i = 0; i < lstView.getCount(); i++) { View listOrderView; listOrderView = lstView.getChildAt(i); try{ EditText txtAmt = (EditText)listOrderView.findViewById(R.id.txtbox); CheckBox cbValue = (CheckBox)listOrderView.findViewById(R.id.chkbox1); if(cbValue.isChecked()== true){ String amt = txtAmt.getText().toString(); Toast.makeText(getBaseContext(), "Amount is :"+amt, Toast.LENGTH_SHORT).show(); } }catch (Exception e) { // TODO: handle exception } } } }); } private static final String[] country = { "item1", "item2", "item3", "item4", "item5", "item6","item7", "item8", "item9", "item10", "item11", "item12" }; private static final String[] curr = { "1", "2", "3", "4", "5", "6","7", "8", "9", "10", "11", "12" }; } Please help me to slove this problem. I have referred in many places. But I could not get proper answer to solve this problem. Please provide me the code to avoid unchecking the checkbox while scrolling up and down. Thank you.

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Code Contracts with Interfaces: "Method Invocation skipped. Compiler will generate method invocation

- by Jörg Battermann

Good evening, I just started playing with Microsoft.Contracts (latest version) and plugging it on top of a sample interface and right now it looks like this: namespace iRMA2.Core.Interfaces { using System; using System.Collections.Generic; using System.ComponentModel.Composition; using System.Diagnostics.Contracts; /// <summary> /// Base Interface declarations for iRMA2 Extensions /// </summary> [InheritedExport] [ContractClass(typeof(IiRMA2ExtensionContract))] public interface IiRMA2Extension { /// <summary> /// Gets the name. /// </summary> /// <value>The name of the Extension.</value> string Name { get; } /// <summary> /// Gets the description. /// </summary> /// <value>The description.</value> string Description { get; } /// <summary> /// Gets the author of the extension. Please provide complete information to get in touch with author(s) and the corresponding department /// </summary> /// <value>The author of the extensions.</value> string Author { get; } /// <summary> /// Gets the major version. /// </summary> /// <value>The major version of the extension.</value> int MajorVersion { get; } /// <summary> /// Gets the minor version. /// </summary> /// <value>The minor version.</value> int MinorVersion { get; } /// <summary> /// Gets the build number. /// </summary> /// <value>The build number.</value> int BuildNumber { get; } /// <summary> /// Gets the revision. /// </summary> /// <value>The revision.</value> int Revision { get; } /// <summary> /// Gets the depends on. /// </summary> /// <value>The dependencies to other <c>IiRMA2Extension</c> this one has.</value> IList<IiRMA2Extension> DependsOn { get; } } /// <summary> /// Contract class for <c>IiRMA2Extension</c> /// </summary> [ContractClassFor(typeof(IiRMA2Extension))] internal sealed class IiRMA2ExtensionContract : IiRMA2Extension { #region Implementation of IiRMA2Extension /// <summary> /// Gets or sets the name. /// </summary> /// <value>The name of the Extension.</value> public string Name { get { Contract.Ensures(!String.IsNullOrEmpty(Contract.Result<string>())); return default(string); } set { Contract.Requires(value != null); } } /// <summary> /// Gets the description. /// </summary> /// <value>The description.</value> public string Description { get { throw new NotImplementedException(); } } /// <summary> /// Gets the author of the extension. Please provide complete information to get in touch with author(s) and the corresponding department /// </summary> /// <value>The author of the extensions.</value> public string Author { get { throw new NotImplementedException(); } } /// <summary> /// Gets the major version. /// </summary> /// <value>The major version of the extension.</value> public int MajorVersion { get { throw new NotImplementedException(); } } /// <summary> /// Gets the minor version. /// </summary> /// <value>The minor version.</value> public int MinorVersion { get { throw new NotImplementedException(); } } /// <summary> /// Gets the build number. /// </summary> /// <value>The build number.</value> public int BuildNumber { get { throw new NotImplementedException(); } } /// <summary> /// Gets the revision. /// </summary> /// <value>The revision.</value> public int Revision { get { throw new NotImplementedException(); } } /// <summary> /// Gets the Extensions this one depends on. /// </summary> /// <value>The dependencies to other <c>IiRMA2Extension</c> this one has.</value> public IList<IiRMA2Extension> DependsOn { get { Contract.Ensures(Contract.Result<IList<IiRMA2Extension>>() != null); return default(IList<IiRMA2Extension>); } } #endregion } } Now why are the two Contract.Ensures(...) 'blured' out visually with the tooltip saying "Method Invocation skipped. Compiler will generate method invocation because the method is conditional or it is partial method without implementation" and in fact the CodeContracts output does not count/show them... What am I missing & doing wrong here? -J

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SSRS sum(distinct()) equivalent

- by HurnsMobile

I am currently working with an SSRS 2008 report that returns a dataset similar to the following: Job# ClientId MoneyIn MoneyOut ------------------------------ 1 ABC123 10 25 1 ABC123 10 25 1 ABC123 5 25 2 XYZ123 25 50 2 XYZ123 25 50 3 XYZ123 15 15 Where MoneyOut should be equal to the total amount of MoneyIn for a job if the job has been balanced out correctly. The problem that I am running into is when displaying this in a tablix in SSRS I can return the correct MoneyOut value for a job by setting the field to =first(Fields!MoneyOut.Value) but I also need to sum the value of these by day and attempting to do =sum(first(Fields!MoneyOut.Value)) yields an error about nesting aggregate functions. I've also attempted to sum the value of the textboxes using something like =sum(ReportItems!MoneyOut1.Value) which yields an error that you can only use aggregates on report items in the header or footer. So my question is, is there some way to duplicate the functionality of distinct() in SSRS reports or is there some way to just total up the values of text fields that I am unaware of? Thanks in advance, TJ

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