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  • Passing array into constructor to use on JList

    - by OVERTONE
    I know the title sound confusing and thats because it is. its a bit long so try too stay with me. this is the layout i have my code designed variables constructor methods. im trying too fill a Jlist full on names. i want too get those names using a method. so here goes. in my variables i have my JList. its called contactNames; i also have an array which stores 5 strings which are the contacts names; heres the code for that anyway String contact1; String contact2; String contact3; String contact4; String contact5; String[] contactListNames; JList contactList; simple enough. then in my constructor i have the Jlist defined to fill itself with the contents of the array fillContactList(); JList contactList = new JList(contactListNames); that method fillContactList() is coming up shortly. notice i dont have the array defined in the constructor. so heres my first question. can i do that? define the array to contain something in te constructor rather than filling it fromt the array. now heres where stuff gets balls up. ive created three different methods all of which havent worked. basically im trying to fill the array with all of them. this is the simplest one. it doesnt set the Jlist, it doesnt do anything compilicated. all it trys too do is fill the array one bit at a time public void fillContactList() { for(int i = 0;i<3;i++) { try { String contact; System.out.println(" please fill the list at index "+ i); Scanner in = new Scanner(System.in); contact = in.next(); contactListNames[i] = contact; in.nextLine(); } catch(Exception e) { e.printStackTrace(); } } } unfortunately this doesnt qwork. i get the print out to fill it at index 0; i input something and i get a nice big stack trace starting at contactListNames[i] = contact; so my two questions in short are how i define an array in a constructor. and why cant i fill the array from that method. ************************888 **************************888 stack trace by request please fill the list at index 0 overtone java.lang.NullPointerException please fill the list at index 1 at project.AdminMessages.fillContactList(AdminMessages.java:408) at project.AdminMessages.<init>(AdminMessages.java:88) at project.AdminUser.createAdminMessages(AdminUser.java:32) at project.AdminUser.<init>(AdminUser.java:18) at project.AdminUser.main(AdminUser.java:47) it was a null poiinter exception

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  • jsp chatting with ajax

    - by paramesh
    Hi sirs, I am writing one web chat program using AJAX (a little bit). It is working when both users open a chat page, but I want to open a window when one user send data to others.

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  • How to create dynamic menulets in OSX

    - by taw
    I want to put a dynamically generated icon (not static image) + possibly a tiny bit of text in OSX menu bar. If possible I'd prefer to do it from Ruby or some other convenient scripting language, but I'll deal with Objective C if that's the only way. How do I do that?

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  • Setting System.Drawing.Color through COM. Interop

    - by user58909
    I am trying to use Aspose.Words library through COM Interop. There is one critical problem: I cannot set color. It is supposed to work by assigning to DocumentBuilder.Font.Color, but when I try to do it I get OLE error 0x80131509. My problem is pretty much like this one: http://bit.ly/cuvWfc

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  • Build farms using ccnet

    - by Grzenio
    Is it possible to use CruiseControl.Net to set up a build farm? We currently have 4 different build machines building different things at different times and have a bit of a headache to manually balance the load somehow. I would prefer to designate one of them to be the master build machine, which would delegate work to the other ones when they are free.

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  • Change/Update a pane using python wx.AUI

    - by Dan
    I'm using wx.AUI and having a bit of a problem managing panes. Once you have created a new pane using AddPane(), what is the syntax to update or change the pane? I've seen the SetPane command but I can't find any examples. Can someone direct me to an example? Or perhaps it makes sense to use some command to delete the pane and create a new one? Thanks in advance for your time.

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  • Visual Studio 2010 -- how to reduce its memory footprint

    - by GregC
    I have a solution with just under 100 projects in it, a mix of C++ and C# (mostly C#). When working in VS2005, the working set of Visual Studio is considerably smaller than that of VS2010. I was wondering if there are some things that can be turned off, so I can develop in VS2010 under 32-bit OS without running out of memory.

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  • CREON development advice

    - by Matthew Hood
    We have a client who has requested a new project with development to be done on a CREON terminal (Spectra Technologies). Can anyone recommend some good resources about terminal and in particular CREON development. Or know of a reputable development team specializing in CREON development. I have done a fair bit of googling / binging without much success.

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  • Why does IPAddress.TryParse allow anything after a ']'

    - by Rawling
    I'd like to use System.Net.IPAddress.TryParse to validate IPv6 addresses because I don't want to write my own reg exp :-) However, this seems to allow strings such as "(validIPv6)](anythingatallhere)" - for example, "1234::5678:abcd]whargarbl". Is there a reason for these being valid, or is this a fault? This is further complicated by the fact that I actually want only strings of the form "[(validIPv6)]:(portnumber)" so I'm going to have to do a bit of validation myself.

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  • Android InAppBilling - what to do when user presses the buy button?

    - by GeekedOut
    I set up the "Dungeons" InAppBilling example locally and I am ready to try it out, but I am a bit confused. I have a button like this: Button donate = (Button)findViewById(R.id.donate); donate.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { // But what do I do here? :) } }); And when it is called, what do I need to do to actually go to the pay screen on android store? Thanks!

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  • Are there any small scale persisitant document/object databases?

    - by Joe Doyle
    I have a few .Net projects that would benefit from using a document/object database opposed to a relational one. I think that db4o would be a good choice, but the $1200 commercial price tag is bit too much for us. I'd love to use MongoDb but it's design isn't for small scale, single server applications. Are there other options out there that I just haven't run across for small scale applications?

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  • How to detect which Space the user is on in Mac OS X Leopard?

    - by georgebrock
    Mac OS X Leopard has a virtual desktop implementation called Spaces. I want to programatically detect which space the user is currently on. Cocoa is preferable but AppleScript is acceptable if there's no other way. I've seen a couple of AppleScript implementations, but the techniques they used seemed a bit too hacky to use in production code (one relied on causing and error and then parsing the error message to get the current space, the other interrogated the Spaces menu GUI)

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  • C++ Win32 API equivalent of CultureInfo.TwoLetterISOLanguageName

    - by Brian Gillespie
    The .NET framework makes it easy to get information about various locales; the Win32 C++ APIs are a bit harder to figure out. Is there an equivalent function in Win32 to get the two-letter ISO language name given an integer locale ID? In C# I'd do: System.Globalization.CultureInfo ci = new System.Globalization.CultureInfo(1034); string iso = ci.TwoLetterISOLanguageName; // iso == "es" now.

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  • Do you gain any operations when you constrain a generic type using where T : struct?

    - by Fiona Holder
    This may be a bit of an abstract question, so apologies in advance. I am looking into generics in .NET, and was wondering about the where T : struct constraint. I understand that this allows you to restrict the type used to be a value type. My question is, without any type constraint, you can do a limited number of operations on T. Do you gain the ability to use any additional operations when you specify where T : struct, or is the only value in restricting the types you can pass in?

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  • aspxcombobox populating on the fly

    - by gaponte69
    Aspxcombobox populating on the fly works fine with IE, but with others browsers, when using arrow keys for navigation, the second depended control, always has value for the first next and not for the current, so I have a bit of delay ...

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