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  • Doubt in abstract classes

    - by mohit
    public abstract class Person { private String name; public Person(String name) { this.name = name; System.out.println("Person"); } public String getName() { return name; } abstract public String getDescription(); } public class Student extends Person { private String major; public Student(String name, String major) { super(name); this.major = major; } public String getMajor() { return major; } @Override public String getDescription() { return "student" + super.getName() + " having" + major; } } public class PersonTest { public static void main(String[] args) { Person person = new Student("XYZ", "ABC"); System.out.println(person.getDescription()); } } Ques: We cannot create objects of abstract classes, then why Person Constructor has been invoked, even its an abstract class?

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  • Messaging strategies to connect different systems

    - by n002213f
    I have a system to handle Applications online and a different system to send SMS/Email notifications to applicants on completion using web services. I can't guarantee the availability of the SMS/Email gateway. Option 1 After an application is complete, place a message on a JMS queue. A Message Driven bean receives the message and make a call for the web service, if it fails leave the message on the queue. I suspect (please correct if incorrect) that if the gate way is offline the continuosly try to send the message which might use up valuable resources. Can the above option be refined are are there any other messaging strategies that can be used?

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  • in c# a label that displays info, then when clicked it opens firefox and searches for the info displ

    - by NightsEVil
    hey i have a label that displays graphics card name and make and stuff and i'm working on having it so that when its clicked, it opens Firefox and searches Google for the info found by "name" i tried using let met Google that for you but it searches for like each work individually well this is what iv tried so far and it kinda works but there's something wrong private void label13_Click(object sender, EventArgs e) { ManagementObjectSearcher Vquery = new ManagementObjectSearcher("SELECT * FROM Win32_VideoController"); ManagementObjectCollection Vcoll = Vquery.Get(); foreach (ManagementObject mo in Vcoll) { System.Diagnostics.Process CcleanerA = System.Diagnostics.Process.Start(@"C:\Program Files (x86)\Mozilla Firefox\firefox.exe", "http://google.com/?q="+(mo["name"].ToString())); } }

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  • How to prevent UI from freezing during lengthy process?

    - by OverTheRainbow
    Hello, I need to write a VB.Net 2008 applet to go through all the fixed-drives looking for some files. If I put the code in ButtonClick(), the UI freezes until the code is done: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 'TODO Find way to avoid freezing UI while scanning fixed drives Dim drive As DriveInfo Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String) Dim filepath As String For Each drive In DriveInfo.GetDrives() If drive.DriveType = DriveType.Fixed Then filelist = My.Computer.FileSystem.GetFiles(drive.ToString, FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*") For Each filepath In filelist 'Do stuff Next filepath End If Next drive End Sub Google returned information on a BackGroundWorker control: Is this the right/way to solve this issue? If not, what solution would you recommend, possibly with a really simple example? FWIW, I read that Application.DoEvents() is a left-over from VBClassic and should be avoided. Thank you.

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  • Interning strings in Java

    - by Tiny
    The following segment of code interns a string. String str1="my"; String str2="string"; String concat1=str1+str2; concat1.intern(); System.out.println(concat1=="mystring"); The expression concat1=="mystring" returns true because concat1 has been interned. If the given string mystring is changed to string as shown in the following snippet. String str11="str"; String str12="ing"; String concat11=str11+str12; concat11.intern(); System.out.println(concat11=="string"); The comparison expression concat11=="string" returns false. The string held by concat11 doesn't seem to be interned. What am I overlooking here? I have tested on Java 7, update 11.

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  • @Resource annotated member not injected - bad code or bug?

    - by Brabster
    I am using an @Resource annotation in a class instantiated in a ServletContextListener's contextInitialized(...) method, but the member is always null. Here's my sample code. Listener: public void contextInitialized(ServletContextEvent sce) { System.err.println("In contextInitialised"); new ResourceListenerTargetTest().executeMe(); } ResourceListenerTargetTest: @Resource(name="MyJDBCResource") private DataSource source; public void executeMe() { /*try { InitialContext ictx = new InitialContext(); source = (DataSource)ictx.lookup("java:comp/env/MyJDBCResource"); } catch (NamingException e) { e.printStackTrace(); }*/ System.err.println("source is " + source); } If I switch the comments and run the manual resource lookup, it works fine. Should the @Resource annotation work like this, when used in a contextInitalized method? Appserver is WAS 7.0.0.5, if it should work then I guess it's a bug? Can anyone confirm?

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  • Regular expression and newline

    - by Ockonal
    Hello guys, I have such text: <[email protected]> If you do so, please include this problem report. <[email protected]> You can delete your own text from the attached returned message. The mail system <[email protected]>: connect to *.net[82.*.86.*]: Connection timed out I have to parse email from it. Could you help me with this job? upd There could be another email addresses in <%here%. There should be connection between 'The mail system' text. I need in email which goes after that text.

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  • ClickOnce related

    - by Nair
    After publishing a WPF application to a central location using ClickOnce, I am getting following exception when user tries to access the application. There are other applications, which works fine for them and issue is only when they access a particular application. I can't workout why this hence the exception doesn't seems to be very helpful. Problem signature: Problem Event Name: CLR20r3 Problem Signature 01: KG0SYKVDCXEI452K403RIQ4BNPUF3BQA Problem Signature 02: 1.0.0.0 Problem Signature 03: 528094d2 Problem Signature 04: System.Data Problem Signature 05: 4.0.0.0 Problem Signature 06: 4dd23ac7 Problem Signature 07: 24da Problem Signature 08: 2c Problem Signature 09: System.Windows.Markup.XamlParse OS Version: 6.1.7601.2.1.0.256.48 Locale ID: 2057 Additional Information 1: 0a9e Additional Information 2: 0a9e372d3b4ad19135b953a78882e789 Additional Information 3: 0a9e Additional Information 4: 0a9e372d3b4ad19135b953a78882e789 Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt

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  • Java: Checking contents of char variable with if condition

    - by Troy
    Hello, I have a char variable that is supposed to contain either a Y,y,n or N character, I want to test if it does not contain it, then display an error message and exit the program. This is the code I am using; if (userDecision != 'Y' || userDecision != 'y' || userDecision != 'n' || userDecision != 'N') { System.out.println("Error: invalid input entered for the interstate question"); System.exit(0); } Irregardless of what is in the variable it always returns true and executes the command to exit the program, what am I doing wrong?

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  • Getting a ReturnValue from cmd.Parameters in c#?

    - by mark smith
    Hi, I have just finished converted a vb.net app to c# and one of the lines is to get @ReturnValue from the parameter. I ended up having to CAST a lot of things.. Is there not a easier way here is what i have int rc = ((System.Data.SqlTypes.SqlInt32)(((System.Data.SqlClient.SqlParameter)(cmd.Parameters["@ReturnValue"])).SqlValue)).Value; In vb.net it was as simple as doing this Dim rc As Integer = Convert.ToInt32(cmd.Parameters("@ReturnValue").Value) Alot easier :-) But the problem with C# is the property Value isn't available unless I Cast to SqlParameter and i also need to cast to Sqltypes.SqlInt32 - i can't just do a standard Convert.ToInt32

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  • Perl CGI script to not wait for a subprocess to complete

    - by Tyug
    Is it possible to continue displaying a CGI script's HTML without waiting for a child process to complete, yet the child process should stay alive when the CGI script is complete. Here's what I have, -- Display HTML page # html page set up... so header/other stuff #the -c, -h are params are just params system("perl subprocess.pm -c params -h 1 &"); #actually print the html page setup ... For some weird reason, it waits for the subprocess to finish before it outputs the html page even though I included the asynchronous system call for linux. It doesn't render the page immediately. Is it possible to print the html page without waiting for the subprocess to finish?

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  • Printing from a Windows Service

    - by Andre
    Ok, I am trying to print a page from a windows service that I installed using a Visual Studio setup project. At first I set the Account property yo Local System, but it will tell me that there are no printers installed (and there are). So I changed it to user and now it just doesn't print (no error or anything). I did some Googleing and basically it said that "Interact with Desktop" should be enabled. To programatically do this you need to edit the registry settings for this service (which really is second prize). I tried to manually set it on the properties dialog under Services, but then I need to change the Account back to Local System, which brings me back to the "No Printers Installed" problem. Any ideas?

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  • SDCC and malloc() - allocating much less memory than is available

    - by Duncan Bayne
    When I run compile this code with SDCC 3.1.0, and run it on an Amstrad CPC 464 (under emulation, with WinCPC 0.9.26 running on Wine): void _test_malloc() { long idx = 0; while (1) { if (malloc(5)) { printf("%ld\r\n", ++idx); } else { printf("done"); break; } } } ... it consistently taps out at 92 malloc()s. I make that 460 bytes, which leads me to a couple of questions: What is malloc() doing on this system? I was sort of hoping for an order of magnitude more storage even on a 64kB system The behaviour is consistent on 64kB systems and 128kB systems; do I have to perform some sort of magic to access the additional memory, like manual bank switching?

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  • What's wrong with my logic (Java syntax)

    - by soda
    I'm trying to make a simple program that picks a random number and takes input from the user. The program should tell the user if the guess was hot (-/+ 5 units) or cold, but I never reach the else condition. Here's the section of code: public static void giveHint (int guess) { int min = guess - 5; int max = guess + 5; if ((guess > min) && (guess < max)) { System.out.println("Hot.."); } else { System.out.println("Cold.."); } }

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  • Can you use zero-width matching regex in String split?

    - by polygenelubricants
    System.out.println( Arrays.deepToString( "abc<def>ghi".split("(?:<)|(?:>)") ) ); This prints [abc, def, ghi], as if I had split on "<|>". I want it to print [abc, <def>, ghi]. Is there a way to work some regex magic to accomplish what I want here? Perhaps a simpler example: System.out.println( Arrays.deepToString( "Hello! Oh my!! Good bye!!".split("(?:!+)") ) ); This prints [Hello, Oh my, Good bye]. I want it to print [Hello!, Oh my!!, Good bye!!]. `.

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  • Need help helping in converting jquery, ajax, json and asp.net

    - by Haja Mohaideen
    I am tying out this tutorial, http://www.ezzylearning.com/tutorial.aspx?tid=5869127. It works perfectly. What I am now trying to do is to host the aspx contents as html file. This html file is hosted on my wampserver which is on my laptop. The asp.net code hosted on my test server. When I try to access, I get the following error, Resource interpreted as Script but transferred with MIME type text/html: "http://201.x.x.x/testAjax/Default.aspx/AddProductToCart?callback=jQuery17103264484549872577_1346923699990&{%20pID:%20%226765%22,%20qty:%20%22100%22,%20lblType:%20%2220%22%20}&_=1346923704482". jquery.min.js:4 Uncaught SyntaxError: Unexpected token < I am not sure how to solve this problem. index.html code $(function () { $('#btnAddToCart').click(function () { var result = $.ajax({ type: "POST", url: "http://202.161.45.124/testAjax/Default.aspx/AddProductToCart", crossDomain: true, data: '{ pID: "6765", qty: "100", lblType: "20" }', contentType: "application/json; charset=utf-8", dataType: "jsonp", success: succeeded, failure: function (msg) { alert(msg); }, error: function (xhr, err) { alert(err); } }); }); }); function succeeded(msg) { alert(msg.d); } function btnAddToCart_onclick() { } </script> </head> <body> <form name="form1" method="post"> <div> <input type="button" id="btnAddToCart" onclick="return btnAddToCart_onclick()" value="Button" /> </div> </form> aspx.vb Imports System.Web.Services Imports System.Web.Script.Services <ScriptService()> Public Class WebForm1 Inherits Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Session("test") = "" End Sub <WebMethod()> <ScriptMethod(UseHttpGet:=False, ResponseFormat:=ResponseFormat.Json)> Public Shared Function AddProductToCart(pID As String, qty As String, lblType As String) As String Dim selectedProduct As String = String.Format("+ {0} - {1} - {2}", pID, qty, lblType) HttpContext.Current.Session("test") += selectedProduct Return HttpContext.Current.Session("test").ToString() End Function End Class

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  • Manipulating the case of the build macros in Visual Studio: $(TargetDir)

    - by miked
    I've come across a weird problem today in Visual Studio 2005. If I create a new configuration "NewConfiguration" for one of my projects. The output directory referred to by the project in $(TargetDir) is "/path/to/build/area/newconfiguration". Note the loss of capital letters, I'd expect it to be in "/path/to/build/area/NewConfiguration". In another project that I created yesterday, the capital letters are there. Normally this would be a problem, but it's part of a fairly complicated build system where some of it's on unix and we need to worry about case sensitive filename. Does anyone know where the source string for the Visual Studio macros like $(TargetDir) are stored so that I can get the case to be consistent and match what we need for our build system?

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  • How do I pass a function to NUnit Throws.Constraints?

    - by Serge Belov
    I'm trying to write some NUnit tests in F# and having trouble passing a function to the ThrowsConstraint. A distilled (non)working sample is below. open System.IO open NUnit.Framework [<TestFixture>] module Example = [<Test>] let foo() = let f = fun () -> File.GetAttributes("non-existing.file") Assert.That(f, Throws.TypeOf<FileNotFoundException>()) This compiles just fine but I get the following from the NUnit test runner: FsTest.Tests.Example.foo: System.ArgumentException : The actual value must be a TestDelegate but was f@11 Parameter name: actual While I'm able to work around the problem using ExpectedException attribute, my question is what is the correct way of using an F# function in this situation?

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  • How to run an exe using c prog

    - by Ujjwal
    Hi All, I am new to this forum. I am in need of a program in C that runs an exe file in Windows. While googling I found the code below : 1. Code: #include<stdlib.h> #include<stdio.h> int main() { (void)system("C:\\Windows\\notepad.exe"); return 0; } The above code compiles successfully in Borland Turbo C. But it fails to run Notepad. 2 Code: #include<stdlib.h> #include<stdio.h> void main() { int result ; result=system("C:\\Windows\\notepad.exe"); printf("%d",result); } The above code on running gives -1 as output. Why am I getting -1. My OS Windows XP Borland Turbo C Compiler Please help.

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  • Why do I get CA1811 when I call a private method from a public method in C++/CLI?

    - by brickner
    I've recently upgraded my project from Visual Studio 2008 to Visual Studio 2010. By enabling Code Analysis and building on Release, I'm getting warning CA1811: Avoid uncalled private code. I've managed to reduce the code to this: .h file: public ref class Foo { public: virtual System::String^ ToString() override; private: static System::String^ Bar(); }; .cpp file: String^ Foo::ToString() { return Bar(); } String^ Foo::Bar() { return "abc"; } The warning I get: CA1811 : Microsoft.Performance : 'Foo::Bar(void)' appears to have no upstream public or protected callers. It doesn't matter if Bar() is static or not. I've tried to reproduce it in C# but I can't. I can only reproduce it in C++/CLI. Why do I get this warning? Is this a Visual Studio 2010 bug?

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  • What really is the purpose of "base" keyword in c#?

    - by Pandiya Chendur
    Thus for used base class for some commom reusable methods in every page of my application... public class BaseClass:System.Web.UI.Page { public string GetRandomPasswordUsingGUID(int length) { string guidResult = System.Guid.NewGuid().ToString(); guidResult = guidResult.Replace("-", string.Empty); return guidResult.Substring(0, length); } } So if i want to use this method i would just do, public partial class forms_age_group : BaseClass { protected void Page_Load(object sender, EventArgs e) { //i would just call it like this string pass = GetRandomPasswordUsingGUID(10); } } It does what i want but there is a "Base" keyword that deals with base class in c# ... I really want to know when should use base keyword in my derived class.... Any good example...

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  • [C++]Two windows fullscreen on two different screen.

    - by sirithang
    Hi! I'm actually working on an app to display an image onto a Dome. The dome projection system is constitued of two projector and a pc running a GentoO Linux and KDE, with nvidia TwinView system. Since here i've used SDL to display a fullscreen windows, and it display my app onto the two screen. But i just figured that i need to project two different images, one on each projector. That's why i search for a solution to display a fullscreen window on the first screen (projector) and another on the second. But SDL fullscreen just extend the window to the two screens. I can use any librairie (since it light and free, as i will wrap it into my small "API"), or change display setting. BTW it would be nice to have openGL support, since SDL manage only one window ^^"

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  • Confusion in RegExp Reluctant quantifier? Java

    - by Dusk
    Hi, Could anyone please tell me the reason of getting an output as: ab for the following RegExp code using Relcutant quantifier? Pattern p = Pattern.compile("abc*?"); Matcher m = p.matcher("abcfoo"); while(m.find()) System.out.println(m.group()); // ab and getting empty indices for the following code? Pattern p = Pattern.compile(".*?"); Matcher m = p.matcher("abcfoo"); while(m.find()) System.out.println(m.group());

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  • CMS for SmartPhones

    - by dde
    The company I work for has a document management and retrieval system. We are noticing employees use more their smartphones than their laptops, but they cannot access the document management system. So, we are thinking about a CMS, with persistent storage, perhaps developed in Java. I just started looking into Jease and dotCMS, and also checked here those recommendations in questions like "Best Open Source Java CMS", etc I find some CMSs too bulky for simple stuff like what we need which is basically document download/edit/upload, and some simple collaboration and personalization stuff. Smartphones of choice in our workforce are Nokia, Blackberry and IPhone, The question is: are there java based with persistent db CMSs aimed at Smartphones right now? I need replication of the complete database and run website offline.

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