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  • Why is the output like this?

    - by javatechi
    class another { public void method(Object o) { System.out.println("This is in method which takes object"); } public void method(String s) { System.out.println("This is method which takes string"); } } public class NewClass { public static void main(String args[]) { another an = new another(); an.method(null); } } When I try to execute this, I get This is method which takes string as the output. Why not "This is in method which takes object"? Object can also be null and string can also be null, why doesn't it invoke first method?

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  • Using SimpleDB (with SimpleSavant) with POCO / existing entities, not attributes on my classes

    - by alex
    I'm trying to use Simple Savant within my application, to use SimpleDB I currently have (for example) public class Person { public Guid Id { get; set; } public string Name { get; set; } public string Description { get; set; } public DateTime DateOfBirth { get; set; } } To use this with Simple Savant, i'd have to put attributes above the class declaration, and property - [DomainName("Person")] above the class, and [ItemName] above the Id property. I have all my entities in a seperate assembly. I also have my Data access classes an a seperate assembly, and a class factory selects, based on config, the IRepository (in this case, IRepository I want to be able to use my existing simple class - without having attributes on the properties etc.. In case I switch out of simple db, to something else - then I only need to create a different implementation of IRepository. Should I create a "DTO" type class to map the two together? Is there a better way?

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  • Is Using Tuples in my .NET 4.0 Code a Poor Design Decision?

    - by Jason Webb
    With the addition of the Tuple class in .net 4, I have been trying to decide if using them in my design is a bad choice or not. The way I see it, a Tuple can be a shortcut to writing a result class (I am sure there are other uses too). So this: public class ResultType { public string StringValue { get; set; } public int IntValue { get; set; } } public ResultType GetAClassedValue() { //..Do Some Stuff ResultType result = new ResultType { StringValue = "A String", IntValue = 2 }; return result; } Is equivalent to this: public Tuple<string, int> GetATupledValue() { //...Do Some stuff Tuple<string, int> result = new Tuple<string, int>("A String", 2); return result; } So setting aside the possibility that I am missing the point of Tuples, is the example with a Tuple a bad design choice? To me it seems like less clutter, but not as self documenting and clean. Meaning that with the type ResultType, it is very clear later on what each part of the class means but you have extra code to maintain. With the Tuple<string, int> you will need to look up and figure out what each Item represents, but you write and maintain less code. Any experience you have had with this choice would be greatly appreciated.

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  • not able to show the file from the array...

    - by sjl
    Hi, i'm trying to do an image gallery. i was not able to display the thumbnails stored in the array. instead it keep showing the same thumbnails. anyone can help? very much appreciated.. // Arrays that store the filenames of the text, images and thumbnails var thumbnails:Array = [ "images/image1_thumb.jpg", "images/image2_thumb.jpg", "images/image3_thumb.jpg", "images/image4_thumb.jpg", "images/image5_thumb.jpg", "images/image6_thumb.jpg", "images/image7_thumb.jpg" ]; var images:Array = [ "images/image1.jpg", "images/image2.jpg", "images/image3.jpg", "images/image4.jpg", "images/image5.jpg", "images/image6.jpg", "images/image7.jpg" ]; var textFiles:Array = [ "text/picture1.txt", "text/picture2.txt", "text/picture3.txt", "text/picture4.txt", "text/picture5.txt", "text/picture6.txt", "text/picture7.txt" ]; // NOTE: thumbnail images are 60 x 43 pixels in size // loop through the array and create the thumbnails and position them vertically for (var i:int = 0; i <7; i++) { // create an instance of MyUIThumbnail var thumbs:MyUIThumbnail = new MyUIThumbnail(); // position the thumbnails on the left vertically thumbs.y = 43 * i;/*** FILL IN THE BLANK HERE ***/ // store the corresponding full size image name in the thumbnail // use the "images" array thumbs.image = "images/image1.jpg"; thumbs.image = "images/image2.jpg"; thumbs.image = "images/image3.jpg"; thumbs.image = "images/image4.jpg"; thumbs.image = "images/image5.jpg"; thumbs.image = "images/image6.jpg"; thumbs.image = "images/image7.jpg"; // store the corresponding text file name in the thumbnail // use the "textFiles" array thumbs.textFile = "text/picture1.txt"; thumbs.textFile = "text/picture2.txt"; thumbs.textFile = "text/picture3.txt"; thumbs.textFile = "text/picture4.txt"; thumbs.textFile = "text/picture5.txt"; thumbs.textFile = "text/picture6.txt"; thumbs.textFile = "text/picture7.txt"; thumbs.imageFullSize = full_image_mc ; // store the reference to the textfield in the thumbnail thumbs.infoText = info; // load and display the thumbnails // use the "thumbnails" array thumbs.loadThumbnail("images/image1_thumb.jpg"); thumbs.loadThumbnail("images/image2_thumb.jpg"); thumbs.loadThumbnail("images/image3_thumb.jpg"); thumbs.loadThumbnail("images/image4_thumb.jpg"); thumbs.loadThumbnail("images/image5_thumb.jpg"); thumbs.loadThumbnail("images/image6_thumb.jpg"); thumbs.loadThumbnail("images/image7_thumb.jpg"); addChild(thumbs); } below is my thumbanail. as package{ import fl.containers.; import flash.events.; import flash.text.; import flash.net.; import flash.display.*; public class MyUIThumbnail extends MovieClip { public var image:String = ""; public var textFile:String = ""; var loader:UILoader = new UILoader(); public var imageFullSize:MyFullSizeImage; // reference to loader to show the full size image public var infoText:TextField; // reference to textfield that displays image infoText var txtLoader:URLLoader = new URLLoader(); // loader to load the text file public function MyUIThumbnail() { buttonMode = true; addChild(loader); this.addEventListener(MouseEvent.CLICK, myClick); txtLoader.addEventListener(Event.COMPLETE, displayText); loader.addEventListener(Event.COMPLETE, thumbnailLoaded); } public function loadThumbnail(filename:String):void { loader.source = filename; preloader.trackLoading(loader); } function myClick(e:MouseEvent):void { // load and display the full size image imageFullSize.loadImage("my_full_mc"); // load and display the text textLoad("info"); } function textLoad(file:String) { // load the text description from the text file loader.load(new URLRequest(textFile)); } function displayText(e:Event) { //display the text when loading is completed addChild(infoText); } function thumbnailLoaded(e:Event) { loader.width = 60; loader.height = 43; } } }

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  • when is a v-table created in C++?

    - by saminny
    When exactly does the compiler create a virtual function table? 1) when the class contains at least one virtual function. OR 2) when the immediate base class contains at least one virtual function. OR 3) when any parent class at any level of the hierarchy contains at least one virtual function. A related question to this: Is it possible to give up dynamic dispatch in a C++ hierarchy? e.g. consider the following example. #include <iostream> using namespace std; class A { public: virtual void f(); }; class B: public A { public: void f(); }; class C: public B { public: void f(); }; Which classes will contain a V-Table? Since B does not declare f() as virtual, does class C get dynamic polymorphism?

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  • What Design Pattern is this?

    - by 01
    I know that everything we do in programming can be described as design pattern(even abstract method has design pattern called template method) public class Guicer extends AbstractModule { private static Injector injector = Guice.createInjector(new Guicer()); public static void setInjector(Injector injector) { Guicer.injector = injector; } public static T getInstance(Class c) { return injector.getInstance(c); } @Override protected void configure() { } } What design patterns are used in this code?

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  • Programming to interfaces while mapping with Fluent NHibernate.

    - by Lucious
    Fluent Mapping I Have the following scenario public class CustomerMap : ClassMap { public CustomerMap() { Table("Customer"); Id(c = c.Id); Map(c = c.Name); HasMany(c = c.Orders); } } public class OrderMap : ClassMap<IOrder> { public OrderMap() { Table("Orders"); References(o => o.Customer).Access.; Id(o => o.Id); Map(o => o.DateCreated); } } Problems When schema exported the order table has two columns ICustomer_Id,Customer_Id. refers to an unmapped class Order exception Can you please help me out?

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  • What does this recursive function do?

    - by null
    What does this function do? And how do you evaluate it? How to trace it? How to understand recursive method? I just can't understand the recursion, and the exam date is coming soon, and I know in order to understand recursion, I must first understand recursion. But I just can't write a slightly complex recursive method, can anyone help me out using the simplest English words. public class BalancedStrings { public static void printBalanced(String prefix, int a, int b) { if (a > 0) printBalanced(prefix + "a", a - 1, b); if (b > 0) printBalanced(prefix + "b", a, b - 1); if (a == 0 && b == 0) System.out.println(prefix); } public static void printBalanced(int n) { if (n % 2 == 0) { printBalanced("", n / 2, n / 2); } } public static void main(String[] args) { printBalanced(4); } }

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  • How to access parents' members from a inner class in WPF?

    - by black sensei
    Hello Experts! I'm trying to do scheduled operation let's say to check for user's credit left via web service call and update the user interface. i've tried with quartz.net to implement the scheduling bit.i created an inner class in the window class i need to update.That inner class has the method that calls the webservice and the result needs to be displayed back to the UI. here is an example of what i did. public partial class Window2 : Window { private int i; public Window2() { InitializeComponent(); } public class Myclass :IJob { public void Execute(JobExecutionContext context) { string result = doMyOperation(); //i'll like to call parent label member of name lblNotif //is something like parent.lblNotif.Content = result; //possible? } public string doMyOperation() { //calling the wermethod to retreive user's balance return result = service.GetUsersBalace(user); } } } Well the quartz bit is working and this post is not about quartz. here are my questions Question 1 : How is it possible to access Window2 controls, for instace lable lblNotif? Question 2 : If my thinking about this is wrong, what is done as best practice to solve my kind of problem, where an application need to do an operation let's say every 5mn and update the the UI. Question 3 : i at first tried to use the backgroundworker and i felt like i can't do the scheduling bit with it.Is that correct or i'm wrong. thanks for those who commented already and sorry for those who didn't get the meaning of my post.I hope this will be a bit clearer.Thanks for reading

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  • How to host a RESTful C# webservice and test it.

    - by Debby
    Hi, I need to create a RESTful webservice in C#. This is what I have right now: namespace WebService { [ServiceContract] public interface IService { [OperationContract(Name="Add")] [WebGet(UriTemplate = "/")] int Add(); } public class Service:IService { public int Add() { // do some calculations and return result return res; } } } Now, my question is How do i host this service at a location say (http://localhost/TestService) and how can i test the service in console application client?

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  • Synchronize JTextFields Values by PropertyChangeListener

    - by gt_ebuddy
    I want to copy the value of a jTextField - TXTFLD1 to another jTextField -TXTFLD2 when the value at TXTFLD1 changes. I choose propertychangelistener because i cannot detect when the value at TXTFLD1 is changed, Because it is changed by some external code which i cannot modify now. The test code is as follows : public class TxtFldSync extends JFrame { private JButton BTN1 = null; private JTextField TXTFLD1 = null; private JTextField TXTFLD2 = null; public static void main(String[] args) { TxtFldSync thisClass = new TxtFldSync(); thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); thisClass.setVisible(true); } public TxtFldSync() { super(); this.setSize(300, 200); BTN1 = new JButton(); BTN1.setBounds(new Rectangle(178, 38, 67, 17)); TXTFLD1 = new JTextField(); TXTFLD1.setBounds(new Rectangle(32, 42, 83, 20)); TXTFLD2 = new JTextField(); TXTFLD2.setBounds(new Rectangle(30, 78, 83, 20)); //listeners TXTFLD1.addPropertyChangeListener("value", new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent arg0) { TXTFLD2.setText(TXTFLD1.getText()+"set by change listener"); //this doesnot work why ? } }); BTN1.addActionListener( new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { TXTFLD1.setText("Action Performed"); //i what to set same value to TXTFLD2 using property change listener } }); this.setContentPane(new Container()); this.getContentPane().add(BTN1); this.getContentPane().add(TXTFLD1); this.getContentPane().add(TXTFLD2); } } Why the property change listener is not working. What are the other alternatives solution for this problem?

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  • Java compile error: reached end of file while parsing } [closed]

    - by adeo8
    I have the following source code public class mod_MyMod extends BaseMod public String Version() { return "1.2_02"; } public void AddRecipes(CraftingManager recipes) { recipes.addRecipe(new ItemStack(Item.diamond), new Object[] { "#", Character.valueOf('#'), Block.dirt }); } When I try to compile it I get the following error: java:11: reached end of file while parsing } What am I doing wrong? Any help appreciated.

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  • Common protected data member in base class?

    - by EXP0
    I have a base class and several derived classes. The derived classes use some common data, can I just put those common data as protected member of the base class? I know the protected member breaks encapsulation sometimes, so I wonder if there is any good approach. Here is a specific example: class Base{ public: virtual void foo() = 0; void printData(); protected: std::vector<std::string> mData; } class Dr1 : public Base{ public: virtual void foo(); //could change mData } class Dr2 : public Base{ public: virtual void foo(); //could change mData } If I put mData into Dr1 and Dr2 as private member, then I need to put it in both of them, and I can not have printData() in Base since printData() need access to mData unless I make printData() virtual and have identical function in both Dr1 and Dr2, which doesn't make much sense to me. Is there a better way to approach this without using protected member? Thank you.

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  • does anyone see any issues with this thread pattern?

    - by prmatta
    Here is a simple thread pattern that I use when writing a class that needs just one thread, and needs to a specific task. The usual requirements for such a class are that it should be startable, stopable and restartable. Does anyone see any issues with this pattern that I use? public class MyThread implements Runnable { private boolean _exit = false; private Thread _thread = null; public void start () { if (_thread == null) { _thread = new Thread(this, "MyThread"); _thread.start(); } } public void run () { while (_exit) { //do something } } public void stop () { _exit = true; if (_thread != null) { _thread.interrupt(); _thread = null; } } } I am looking for comments around if I am missing something, or if there is a better way to write this.

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  • android get URL path

    - by Tom91136
    I've got a string: public://imageifarm/3600.jpg How can I extract the imageifarm/3600.jpg Part out using android? What I've tried so far: URL drupalQuestionNodeImageURI = new URL("public://imageifarm/3600.jpg"); Log.d("TAG", drupalQuestionNodeImageURI.getPath()); but it throws this exception: 09-16 17:24:39.992: W/System.err(3763): java.net.MalformedURLException: Unknown protocol: public How can I solve this? I know I can use regular expressions but that seems to defeat the purpose of URL(URI) in this case.

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  • Generic Func<> as parameter to base method

    - by WestDiscGolf
    I might be losing the plot, but I hope someone can point me in the right direction. What am I trying to do? I'm trying to write some base methods which take Func< and Action so that these methods handle all of the exception handling etc. so its not repeated all over the place but allow the derived classes to specify what actions it wants to execute. So far this is the base class. public abstract class ServiceBase<T> { protected T Settings { get; set; } protected ServiceBase(T setting) { Settings = setting; } public void ExecAction(Action action) { try { action(); } catch (Exception exception) { throw new Exception(exception.Message); } } public TResult ExecFunc<T1, T2, T3, TResult>(Func<T1, T2, T3, TResult> function) { try { /* what goes here?! */ } catch (Exception exception) { throw new Exception(exception.Message); } } } I want to execute an Action in the following way in the derived class (this seems to work): public void Delete(string application, string key) { ExecAction(() => Settings.Delete(application, key)); } And I want to execute a Func in a similar way in the derived class but for the life of me I can't seem to workout what to put in the base class. I want to be able to call it in the following way (if possible): public object Get(string application, string key, int? expiration) { return ExecFunc(() => Settings.Get(application, key, expiration)); } Am I thinking too crazy or is this possible? Thanks in advance for all the help.

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  • Is it possible to create a Service that listens for hardware key presses?

    - by VoteBrian
    I'd like to run an Android background service that will act as a keylistener from the home screen or when the phone is asleep. Is this possible? From semi-related examples online, I put together the following service, but get the error, "onKeyDown is undefined for the type Service" public class ServiceName extends Service { @Override public void onCreate() { //Stuff } public IBinder onBind(Intent intent) { //Stuff return null; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(event.getAction() == KeyEvent.ACTION_DOWN) { switch(keyCode) { case KeyEvent.KEYCODE_A: //Stuff return true; case KeyEvent.KEYCODE_B: //Stuff return true; //etc. } } return super.onKeyDown(keyCode, event); } } I realize Android defaults to the search bar when you type from the home screen, but this really is just for a very particular use. I don't really expect to distribute this. Also, it'd be nice to use the camera button to wake the phone.

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  • Please help! Delegate returns null via Dipendency Injection.

    - by Raj Aththanayake
    Can someone please help? I use Google code’s Moq framework for mocking within my Unit Tests and Unity for Dependency Injection. In my Test class private Mock<ICustomerSearchService> CustomerSearchServiceMock = null; private CustomerService customerService = null; private void SetupMainData() { CustomerSearchServiceMock = new Mock<ICustomerSearchService>(); customerService = new CustomerService (); // CustomerSearchService is a property in CustomerService and dependency is configuered via Unity customerService.CustomerSearchService = CustomerSearchServiceMock.Object; Customer c = new Customer () { ID = "AT" }; CustomerSearchServiceMock.Setup(s => s.GetCustomer(EqualsCondition)).Returns(c); } [TestMethod] public void GetCustomerData_Test_Method() { SetupMainData() var customer = customerService.GetCustomerData("AT"); } public static bool EqualsCondition(Customer customer) { return customer.ID.Equals("AT"); } In my Test class CustomerService class public class CustomerService : ICustomerService { [Dependency] public ICustomerSearchService CustomerSearchService { get; set; } public IEnumerable<SomeObject> GetCustomerData(string custID) { I GET Null for customer ?????} var customer = CustomerSearchService.GetCustomer (c => c.ID.Equals(custID)); //Do more things } } When I debug the code I can see CustomerSearchService has a proxy object, but the customer returns as null. Any ideas? Or is there something missing here? Note: ICustomerSearchService I have implemented below method. Customer GetCustomer(Func<Customer, bool> predicate);

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  • New records added to DataGridView aren't displayed

    - by Ross
    I have a custom Order class, groups of which are stored in List<Order> and a DataGridView. I think the problem is in my implementation so here's how I'm using it: In the form enclosing DataGridView (as OrdersDataGrid): public partial class MainForm : Form { public static List<Order> Orders; public MainForm() { // code to populate Orders with values, otherwise sets Orders to new List<Order>(); OrdersDataGrid.DataSource = Orders; } Then in another form that adds an Order: // Save event public void Save(object sender, EventArgs e) { Order order = BuildOrder(); // method that constructs an order object from form data MainForm.Orders.Add(order); } From what I can tell from the console this is added successfully. I thought the DataGrid would be updated automatically after this since Orders has changed - is there something I'm missing? The DataGrid accepts the class since it generates columns from the members.

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  • C#. Binding object to object

    - by w1z
    Hello all, I develop the part of app functionality. I have the databinding object 'A' and another object 'B'. public class SomeProxy { public SomeProxy(BindingSource A) { var b = new B(); } } public class B { public int SomePropertyFromA{get;set;} //Some autocalculated propeties, that are based on SomePropertyFromA //I want to reculculate them, when the SomePropertyFromA will be changed } 'B' object culculates some values, based on the property 'a' of the 'A' object. I want to bind property in object 'B' to the same property 'a' in 'A'. It's need to handle on changes of the 'a' property, because some UI controls are binded to 'B'-s properties. How can I do this? Sorry for some oddness. Thanks

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  • How to query for entities with no matching siblings, with LINQ?

    - by Ryan
    I've got the two following entities ... class Citation { public int CitationId { get; set; } public string Identifier { get; set; } } class CitationIdentifier { public int CitationIdentifierId { get; set; } public string Identifier { get; set; } } I'm trying to query for all Citation records where the Identifier property does not match any of the CitationIdentifiers record Identifier property. So, if I have a Citation with an Identifier property containing "foo", but there are no CitationIdentifier records with an Identifier property containing "foo", then I'd like to retrieve that Citation. I'm working with an IDbSet<Citation>. Any ideas? Thanks.

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  • Suggestions for lightweight, thread-safe scheduler

    - by nirvanai
    I am trying to write a round-robin scheduler for lightweight threads (fibers). It must scale to handle as many concurrently-scheduled fibers as possible. I also need to be able to schedule fibers from threads other than the one the run loop is on, and preferably unschedule them from arbitrary threads as well (though I could live with only being able to unschedule them from the run loop). My current idea is to have a circular doubly-linked list, where each fiber is a node and the scheduler holds a reference to the current node. This is what I have so far: using Interlocked = System.Threading.Interlocked; public class Thread { internal Future current_fiber; public void RunLoop () { while (true) { var fiber = current_fiber; if (fiber == null) { // block the thread until a fiber is scheduled continue; } if (fiber.Fulfilled) fiber.Unschedule (); else fiber.Resume (); //if (current_fiber == fiber) current_fiber = fiber.next; Interlocked.CompareExchange<Future> (ref current_fiber, fiber.next, fiber); } } } public abstract class Future { public bool Fulfilled { get; protected set; } internal Future previous, next; // this must be thread-safe // it inserts this node before thread.current_fiber // (getting the exact position doesn't matter, as long as the // chosen nodes haven't been unscheduled) public void Schedule (Thread thread) { next = this; // maintain circularity, even if this is the only node previous = this; try_again: var current = Interlocked.CompareExchange<Future> (ref thread.current_fiber, this, null); if (current == null) return; var target = current.previous; while (target == null) { // current was unscheduled; negotiate for new current_fiber var potential = current.next; var actual = Interlocked.CompareExchange<Future> (ref thread.current_fiber, potential, current); current = (actual == current? potential : actual); if (current == null) goto try_again; target = current.previous; } // I would lock "current" and "target" at this point. // How can I do this w/o risk of deadlock? next = current; previous = target; target.next = this; current.previous = this; } // this would ideally be thread-safe public void Unschedule () { var prev = previous; if (prev == null) { // already unscheduled return; } previous = null; if (next == this) { next = null; return; } // Again, I would lock "prev" and "next" here // How can I do this w/o risk of deadlock? prev.next = next; next.previous = prev; } public abstract void Resume (); } As you can see, my sticking point is that I cannot ensure the order of locking, so I can't lock more than one node without risking deadlock. Or can I? I don't want to have a global lock on the Thread object, since the amount of lock contention would be extreme. Plus, I don't especially care about insertion position, so if I lock each node separately then Schedule() could use something like Monitor.TryEnter and just keep walking the list until it finds an unlocked node. Overall, I'm not invested in any particular implementation, as long as it meets the requirements I've mentioned. Any ideas would be greatly appreciated. Thanks! P.S- For the curious, this is for an open source project I'm starting at http://github.com/nirvanai/Cirrus

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