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• Java ME get yesterday's date

  - by Nimrod Shory

  Hello, I need to get yesterday's date from a Java ME midlet. I know Java's Calendar object has an add method but Java ME's Calendar doesn't have it. Is there an easy way to retrive yesterday's date? Thanks.

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• Robust way to save/load objects with dependencies?

  - by mrteacup

  I'm writing an Android game in Java and I need a robust way to save and load application state quickly. The question seems to apply to most OO languages. To understand what I need to save: I'm using a Strategy pattern to control my game entities. The idea is I have a very general Entity class which e.g. stores the location of a bullet/player/enemy and I then attach a Behaviour class that tells the entity how to act: class Entiy { float x; float y; Behavior b; } abstract class Behavior { void update(Entity e); {} // Move about at a constant speed class MoveBehavior extends Behavior { float speed; void update ... } // Chase after another entity class ChaseBehavior extends Behavior { Entity target; void update ... } // Perform two behaviours in sequence class CombineBehavior extends Behavior { Behaviour a, b; void update ... } Essentially, Entity objects are easy to save but Behaviour objects can have a semi-complex graph of dependencies between other Entity objects and other Behaviour objects. I also have cases where a Behaviour object is shared between entities. I'm willing to change my design to make saving/loading state easier, but the above design works really well for structuring the game. Anyway, the options I've considered are: Use Java serialization. This is meant to be really slow in Android (I'll profile it sometime). I'm worried about robustness when changes are made between versions however. Use something like JSON or XML. I'm not sure how I would cope with storing the dependencies between objects however. Would I have to give each object a unique ID and then use these IDs on loading to link the right objects together? I thought I could e.g. change the ChaseBehaviour to store a ID to an entity, instead of a reference, that would be used to look up the Entity before performing the behaviour. I'd rather avoid having to write lots of loading/saving code myself as I find it really easy to make mistakes (e.g. forgetting to save something, reading things out in the wrong order). Can anyone give me any tips on good formats to save to or class designs that make saving state easier?

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• Linux C++: how to profile time wasted due to cache misses?

  - by anon

  I know that I can use gprof to benchmark my code. However, I have this problem -- I have a smart pointer that has an extra level of indirection (think of it as a proxy object). As a result, I have this extra layer that effects pretty much all functions, and screws with caching. Is there a way to measure the time my CPU wastes due to cache misses? Thanks!

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• JSON datetime between Python and JavaScript

  - by kevin

  I want to send a datetime.datetime object in serialized form from Python using JSON and de-serialize in JavaScript using JSON. What is the best way to do this?

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• c# reflection: How can I invoke a method with an out parameter ?

  - by ldp615

  I want expose WebClient.DownloadDataInternal method like below: [ComVisible(true)] public class MyWebClient : WebClient { private MethodInfo _DownloadDataInternal; public MyWebClient() { _DownloadDataInternal = typeof(WebClient).GetMethod("DownloadDataInternal", BindingFlags.NonPublic | BindingFlags.Instance); } public byte[] DownloadDataInternal(Uri address, out WebRequest request) { _DownloadDataInternal.Invoke(this, new object[] { address, out request }); } } WebClient.DownloadDataInternal has a out parameter, I don't know how to invoke it. Help!

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• Interview question about virtual functions in C++

  - by benjamin button

  I was asked this crazy question. I was out of my wits. Can a method in base class which is declared as virtual be called using the base class pointer which is pointing to a derived class object? Is this possible?

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• Ajax process from point of initiating a request to user seeing result?

  - by Caylem

  Hi I'm looking for a straight forward list(with any notable information to match the point) of the separate processes involved from initiating the request object to the user seeing the end result in AJAX? Thanks.

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• Decorator Design Pattern - Not Possible

  - by Lennie

  Hi, This is more a design question... You can't do a decorate design pattern if: 1) The object is marked "sealed" meaning you can't extend from it. 2) or you want to override a method but its not virtual. What can you do then? Taken that you can't change the class source code if you don't have the source code (like a 3rd party library).

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• Create a table using obj-c for MAC and display values in the table.

  - by lohith

  Can anyone guide me how to create a table using obj-c for MAC. The program should read values from an NSArray object and display the values on the table.I wld appreciate if anyone helped me out.

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• what kind of components can fail in rmi?

  - by Moblin

  Was wondering what kind of software and hardware component cant fail in a rmi program? so for example in a client server model when a client invokes an object in the server? thanks

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• Horizontal scrolling in a wx.RichTextCtrl

  - by Sam

  I have a RichTextCtrl created as follows: self.userlist = wx.richtext.RichTextCtrl(self, style=wx.TE_MULTILINE|wx.TE_READONLY|wx.HSCROLL) It all works fine, except for the wx.HSCROLL style. If I change the RichTextCtrl to a regular TextCtrl, it correctly horizontal scrolls on long lines, rather than wrapping, but on the RichTextCtrl it wraps regardless. Is there an easy way to make it scroll horizontally? (I do, unfortunately, need the RichTextCtrl's featureset for this object.)

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• Why isn't the SQLiteOpenHelper called just SQLiteHelper?

  - by Emanuil

  The documentation describes the class as a helper object to create, open, and/or manage a database. Having that in mind wouldn't you say that the name is a little misleading?

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• Use the serialVersionUID or suppress warnings?

  - by Okami

  Dear all, first thing to note is the serialVersionUID of a class implementing Interface Serializable is not in question. What if we create a class that for example extends HttpServlet? It also should have a serialVersionUID. If someone knows that this object will never be serialized should he define it or add an annotation to suppress those warnings? What would you do and why? Thanks for sharing your thoughts. Okami

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• Binding of JText fields value to Info Class

  - by Faizan Ahmed

  Is there any way to automatic binding of Swing JTextFields to Info Class. e.g private JTextField receiptId; private JTextField Id; public class Info { private string receiptId; private String id; // Getters and Setters } Is there any way when I entered values from Swing page then automatically values bind with my Info class? After that I can pass my Info object to other classes instead of sending all Text Fields.

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• C#: Can you detect whether or not the current execution context is within `lock (this)`?

  - by John Gietzen

  If I have an object that I would like to force to be accessed from within a lock, like so: var obj = new MyObject(); lock (obj) { obj.AddOne(); obj.RemoveOne(); } Is it possible, from within the AddOne and RemoveOne functions to detect whether the current execution context is within a lock? Something like: Monitor.AreWeCurrentlyEnteredInto(this)

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• how to get the css keys and values for any html tag

  - by artsince

  I would like to dump all css key/value pairs for an html tag. In particular, I would like to learn the css properties for <audio> tag, so I can try to customize the look. document.getElementById('myaudio').style returns a CSSStyleDeclaration object but length returns 0 and I cannot figure out to iterate over the key/value pairs. Thank you

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• sequential minimal optimization C++

  - by Anton

  Hello. I want to implement the method of SVM. But the problem appeared in his training. It was originally planned to use SMO, but did not find ready-made libraries for C++. If there is a ready, then share it. Thank you in advance. The problem of finding an object in the picture (probably human)

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• Click a button on an MS Access form from C# using Access Interop

  - by Az

  Hi, I can connect to the access database and run functions etc from c#, I can even get a hold of the button I need to click, but I can't make it think it's been clicked. nonManagedDb.DoCmd.OpenForm("frmMaintenance", Access.AcFormView.acNormal, MissingVal, Access.AcFormOpenDataMode.acFormReadOnly, Access.AcWindowMode.acWindowNormal, MissingVal); var RunRep = (CommandButton)nonManagedDb.Forms["frmMaintenance"].Controls["btnDailySheetsReport"]; That's as afar as I've gotten with this, I've tried reflection to grab it's event and invoke it but it's classed as a COM object only so that's out.

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• boost::asio and socket ownership

  - by vedro so snegom

  Hello I've two classes (Negotiator, Client), both has their own boost::asio::ip::tcp::socket. Is there a way to transfer socket object to Client after negotiation is finished. I'm looking forward to do something like that: boost::asio::ip::tcp::socket sock1(io); //... boost::asio::ip::tcp::socket sock2; sock2.assign(sock1); This operation must guarantee that the connection won't be closed when sock1 is destroyed.

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• Difference between abstract class and interface

  - by nectar

  A class implementing an interface has to implement all the methods of the interface, but if that class is implementing an abctract class is it necessary to implement all abstract methods? If not, can we create the object of that class which is implementing the Abstract class???

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• Passing a filepath to a R function?

  - by Philipp

  Hi everybody, I tried to pass a filepath to a function in R, but I failed =/ I hope someone here can help me. >heat <- function(filepath) { chicks <- read.table(file=filepath, dec=",", header=TRUE, sep="\t") ... } When I call the function, nothing happens... >heat("/home/.../file.txt") ... and "chicks" is not found >chicks Error: Object 'chicks' not found What is the correct way to pass a path to a function? Best wishes from Germany, Phil

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• Detecting Enter KeyPress on VB.NET 2008

  - by Tareq

  I am using 3.5 framework of VB.NET 2008. I have some textboxes in my form. I want the tab like behavior when my user presses ENTER on one of my textboxes. I used the following Code: Private Sub txtDiscount_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtDiscount.KeyPress If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then SendKeys.Send("{TAB}") e.Handled = True End If End Sub But It doen't work for me. Please give me a solution.

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• java classcast exception

  - by shil

  hi i have problems in converting an XML document type into a Document object.. this is the piece of code line 1 : Document doc=null; line 2 : doc = (Document) parser.parse(sourceFile); for this line 2 it throws java classcast exception.. without the typecast it shows error as "Type mismatch: cannot convert from org.w3c.dom.Document to javax.swing.text.Document" how do i now typecast properly? any suggestions??

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• Passing a model into RedirectToAction()

  - by larryq

  I'm curious how this works. In MVC you can call View() and pass a model as a parameter, but RedirectToAction (one of its incarnations at least) takes a 'routeValues' object, which appears to be the closest match. If your model is passed in this parameter will that model type be available in the subsequent action method? Or are there caveats involved that might prevent accurate translation in some circumstances?

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• Java: I want to print reverse of any String without using any predefine function?

  - by Sanjeev

  how to print reverse of String "java is object orientated language" without using any predefine function like reverse() in java? any idea.

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