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  • Why isn't the "this." command needed in this constructor? (java)

    - by David
    I'm reading a book about java. It just got to explaining how you create a class called "deck" which contains an array of cards as its instance variable(s). Here is the code snippit: class Deck { Card[] cards; public Deck (int n) { cards = new Card[n]; } } why isn't the this. command used? for example why isn't the code this: class Deck { Card[[] cards; public Deck (int n) { this.cards = new Card[n]; } }

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  • Does anyone know why rsync would keep sending the files over and over again?

    - by beagleguy
    I'm trying to using rsync to backup some files, about half a TB. It's now it a state where it keeps sending the same files everytime it runs. for example: rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt I then verify those files are copied over... then the next time it runs it does the same thing rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt any idea why it's getting stuck on these files? I've tried to wipe the whole dest directory out and start over but no luck. thanks,

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  • Why is Internet Explorer treating a file as a web page?

    - by msbg
    I am trying to download a Photoshop shape file (.csh), and instead of downloading it, IE treats it as a webpage and shows a series of symbols. When I try to save it, I am told to either save as an html file or txt file. If I save as txt file and change the extension, Photoshop says it is invalid, since IE saves the text source, not the actual file. I ended up having to use a download program to download it. Why is IE treating it as a webpage, and is there a way to fix the problem? Firefox shows the same issue.

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  • Why does diskpart set the volume attributes on all volumes?

    - by Nick
    I was trying to migrate a Win7 OS from a HDD to a SSD. I've created 2 partition with 1024KB offset, with diskpart: 100MB System Reserved and a 60GB for C:. I've cloned their contents using Easeus Disk Copy. I've loaded the Windows 7 Boot DVD, and wanted to use diskpart to drop the letter for the System Reserved partition and make it hidden. select volume 0 detail volume attribute volume set nodefaultdriveletter attribute volume set hidden These 2 attribute set commands actioned on both volumes (0 and 1, MSR and C:) instead of the selected one, and viceversa. I've tried to clear these attributes from volume 1, but it cleared them also from volume 0. Why does DiskPart have this behaviour?

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  • Why is idle windows VM using so much CPU?

    - by Jeff Shattock
    I have 2 VMs running as guests on a KVM virtualization platform running on Ubuntu 10.04. One VM is an Ubuntu 10.04 system, the other is a Windows 7 system. When both machines are completely logged out, the Linux machine uses 1% CPU, the Windows one 45-50%, according to top. The graphs in virt-manager seem to back this up. Theres nothing installed on the Win7 image that would be running in the background; its as fresh as can be. Why is the Windows VM using so much more than the Linux VM, when both are logged out and idling?

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  • Why avoid pessimistic locking in a version control system?

    - by raven
    Based on a few posts I've read concerning version control, it seems people think pessimistic locking in a version control system is a bad thing. Why? I understand that it prevents one developer from submitting a change while another has the file checked out, but so what? If your code files are so big that you constantly have more than one person working on them at the same time, I submit that you should reorganize your code. Break it up into smaller functional units. Integration of concurrent code changes is a tedious and error-prone process even with the tools a good version control system provides to make it easier. I think it should be avoided if at all possible. So, why is pessimistic locking discouraged?

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  • Why am I seeing excessive disk activity when installing applications?

    - by Kev
    I'm running Windows 7 Ultimate 64 bit on a Dell Vostro 1720 with 8GB of RAM, 7200RPM Disk, 2.53 GHz Core2Duo (Windows 7 64 bit is a supported option and the laptop came with the OS pre-installed). I'm noticing some fairly excessive disk activity when running installers. For example the Visual Studio 2010 RC installer constantly accessed the disk for ~10 minutes. It was so excessive that I was unable to use the machine until this ceased. Today I installed Trillian Astra 4.1 for Windows (latest build from the website). Again when I ran the installer I was pretty much locked out of the machine until the disk activity calmed down. In both cases when I eventually managed to launch task manager I could see that the CPU was sitting at around 5% to 7% utilisation whilst this was going on. All other disk related activity is fine, the machine is snappy and applications launch without delay. It's just when I run an installer I see this odd behaviour. Why would this be?

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  • Why state cannot be part of Presenter in MVP?

    - by rFactor
    I read http://www.codeproject.com/KB/architecture/MVC_MVP_MVVM_design.aspx and it said: As powerful as they are, both MVC and MVP have their problems. One of them is persistence of the View’s state. For instance, if the Model, being a domain object, does not know anything about the UI, and the View does not implement any business logic, then where would we store the state of the View’s elements such as selected items? Fowler comes up with a solution in the form of a Presentation Model pattern. I wonder why Presenter can't hold View state? It already holds all View logic. As far as I understand, in MVC and MVP the state is kept in View. In PM and MVVM the state is kept in the Presentation Model. Why can't Presenter follow PM in this particular case and contain the state of the view? Here is another article which says Presenter does not hold View state, instead the view does: http://www.codeproject.com/KB/aspnet/ArchitectureComparison.aspx

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  • What is a good router linux distro and WHY?

    - by madmaze
    I have a rather large home network with many clients. Ive decided I want to build a Linux based router, I have an 1.6Ghz dual-core(atom) system kicking around which will be re-purposed. So ive looked at a bunch of specific router distros but cant decide. I have also looked into taking a Ubuntu server or FreeBSD install and adding needed packages. So question is, what is the best router-Linux or base Linux distro and why? resources appreciated.

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  • Why would searching in Websphere Portal Administration exclude some results?

    - by Scott Leis
    I have logged into a website based on Websphere Portal 6.0, gone to the Administration console, then to Portlet Management - Portlets. At a guess, there are about 200 portlets on this server. 22 portlets have a title starting with "IGM", but if I use the "Title starts with" search option and enter "igm" (or any case variation), only one of these portlets is found. The portlets excluded from the "Title starts with" search are also excluded from the "Title contains" search, but some of them can be found with the "Unique name contains" search (noting that only 5 of these have a unique name). Why would title searches exclude these portlets? I also see similar behaviour in other areas of the Portal administration. E.g. going to Portal Settings - Custom Unique Names - Pages, and performing title searches excludes some results, depending on the search terms entered.

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  • Ruby on Rails: What are Erubis' disadvantages and why isn't it packaged with Rails by default? How t

    - by williamjones
    I just discovered Erubis, a replacement for the default view renderer for Ruby on Rails. However, from what I can tell from reading about it, it's superior across the board. It is much faster. It has many more options. It can prevent cross site scripting without having to use h. Does this have any disadvantages versus the standard erb renderer? Why isn't this the standard renderer packaged with Rails? Also, the docs for Erubis say to install it just by installing the gem, and then add the following to environment.rb: require 'erubis/helpers/rails_helper' #Erubis::Helpers::RailsHelper.engine_class = Erubis::Eruby # or Erubis::FastEruby Reading the docs, FastEruby seems to be just a faster renderer than Eruby. Why wouldn't it be default and used by everyone? I'm highly interested in using the engine erubis::EscapedEruby which automatically calls h to escape html on fields from the database. Are there any gotchas I should be aware of or does this pretty much solve all cross site scripting?

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  • Why does sshd give a different identification when connecting through netcat?

    - by Robbie Mckennie
    I have been attempting to create a way to ssh into a machine hiding behind a firewall. I set up my ssh client with the option Proxycommand /usr/bin/ncat -l 2000, and then I connect it to sshd with ncat <client> 2000 -c "sshd -i" on the server. It works in that I can get a shell on the server, but the server sends a different key than when I use normal ssh. So the question is, why? Is the key different when sshd is called in this unusual way?

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  • Why is my Output distorted after encoding with Expression Encoder?

    - by WernerCD
    I'm a "n00b" when it comes to re-encoding files. I'm trying to re-encode an AVI into a silverlight container via Encoding Video using Expression Encoder 4.0. As you can see in the video, the left is the input and it looks/sounds fine. The right is the output and it... doesn't. I'm unsure of where to go from here. I'm not sure why the output is jacked up, since the input looks fine. Input Video properties: AVI 2.49GB 22:34 809x605 Video: TSCC 809x605 15fps [Stream 00] Audio: PCM 22050Hz mono 352kbps [Stream 01] Choice of output doesn't seem to matter, they all end up distorted like the picture shows.

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  • Why Microsoft not provide for C# a static Win32 class with the most native functions and structures

    - by Oleg
    Everybody who used P/Invoke of Windows API knows a long list of declarations of static functions with attributes like [DllImport ("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] The declaration of structures copied from Windows headers like WinNT.h or from web sites like www.pinvoke.net take also a lot of place in our programs. Why we all have to spend our time for this? Why Microsoft not give us a simple way to include a line like in old unmanaged programs #include <windows.h> and we would be have access to a static class Native with all or the most Windows functions and structures inside?

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  • Why ping another inet machine from MacBook get netgate's ip address?

    - by Xinwang
    I have three machine in my home network connected by a wireless router. One is server installed linux at 192.168.1.1, another is Thinkpad with MS Windows XP at 192.168.1.2, last one is MacBook Pro with Mac OS X 10.6.3 at 192.168.1.3. When I ping the Linux Server from Thinkpad (MS Windows XP) I can get the correct ip address, but when I ping it from Mac I get the global address of my router, like 61.135.181.175. Could you tell me why this happen? And how do I get same ping result on Mac and Windows. Thanks

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  • Why does m4 error "linux-gnu.m4 - No such file or directory" appear the first time after updating sendmail.mc?

    - by Mike B
    SendMail 8.14.x | CentOS 5.x I've noticed that if I manually update /etc/mail/sendmail.mc (for example, enable TLS support), and then bounce sendmail, I get the following error: Shutting down sm-client: [ OK ] Shutting down sendmail: [ OK ] Starting sendmail: sendmail.mc:18: m4: cannot open `/usr/share/sendmail-cf/ostype/linux-gnu.mf': No such file or directory [ OK ] Starting sm-client: [ OK ] This only happens one time after I update a sendmail.mc file. If I bounce sendmail again (without making any other change), I don't see the error any more. Any idea why this happens? It doesn't cause any errors - I'm just curious.

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  • Why does the command forfiles list files that are not a day old despite the command being otherwise?

    - by PeanutsMonkey
    The command I am executing is forfiles -p"C:\testdata" -m*.* -d-1 -c"cmd /c echo @PATH\@FILE" I have specified that I wish to only list files that are a day old however when I execute the statement, it returns me a list of files that were created today. Why is that? Am I doing something wrong? Would it be better to specify a time period as opposed to a date e.g. 24 hours? The version of forfiles I have reads as follows FORFILES v 1.1 - [email protected] - 4/98. The batch file is being run on Windows XP.

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  • Why does the CPU usage reach 100% when laptop is plugged in?

    - by Mayank
    I have an HP Elitebook 8440p with Windows 7 Ultimate, i7 Processor and 8 GB RAM. For the last couple of days, when I plug-in my laptop for charging, the CPU usage shoots up to 100% and remains there for around 15 minutes. No offending process shows up in Task Manager/Process Explorer but the laptop is practically unusable for that time. The CPU usage becomes normal when I remove the power cord but shoots up again when plugged back. This is happening with different power adapters/wall sockets so it might not be a faulty adapter issue. Why is this happening and any pointer to resolve this issue?

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  • Why can my Mac not connect to my iPhone via ssh?

    - by martin08
    I couldn't always ssh to my iPhone from my Mac. They're both on the same wifi network but sometimes the connection is established, sometimes it failed. From my Mac: $ ssh [email protected] ssh: connect to host 192.168.0.102 port 22: Operation timed out $ ping 192.168.0.102 PING 192.168.0.102 (192.168.0.102): 56 data bytes ping: sendto: No route to host ping: sendto: Host is down ping: sendto: Host is down I enabled SSH on the phone and am sure it can load webpages. So what might be a reason why they cannot connect? Thanks

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  • Chrome - Why am I automatically authenticated to a web app even after clearing browser cookies?

    - by Howiecamp
    I am accessing a web application using Chrome. If I sign out of the app and clear all Chrome history/cookies/etc (even Flash cookies which are now handled by Chrome in the same Clear History area) and then re-access the site, I am automatically logged in without being prompted for credentials. I then launched Chrome in Incognito mode and was able to reproduce the same behavior. However, the I was prompted upon the first logon while in Incognito mode. The web application behaves as expected in Internet Explorer 10. Some info about the application: It's a Sharepoint site using NTLM authentication The credentials are Active Directory-based, as the username is domain\username My connection is over the Internet and there is no AD relationship between my local Windows account, my Windows PC. In other words I (meaning my locally logged on user and my PC) are not in any way part of their AD domain. The site is running SSL on port 443 Why might Chrome be automatically authenticating me?

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  • Why do servers go down after a lot of traffic?

    - by mohabitar
    I'm working on an iOS app that makes extensive use of databases, where users will be able to sync their data to a server. However, I'm terrified of the event that if too many users start using the app, the servers will no longer be able to handle it. I'm not a server guy at all and am not too familiar with how that works, but my question is, why do servers get overloaded and how can that be prevented? Does it have to do with who my server host is? Or is it about the efficiency of my code? If my host is a reliable server, such as Amazon AWS, am I still at risk for server problems? Bottom line is, does it have to do with the way I implement my code, or does it have to do with who my host is?

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  • Why does a Remote Desktop Redirected Printer Doc appear every time I connect to Windows Server 2003 SBS?

    - by Jim Dagg
    I've run into a weird, persistent issue regarding a remote desktop connection. Every time I successfully log into a server running Windows Server 2003 SBS, without taking any further action, after a few seconds a print job spontaneously appears on my machine, titled "Remote Desktop Redirected Printer Doc". The document is 4K, datatype RAW, processor "WinPrint". I've heard of people running into this issue before, but can't seem to hunt down a coherent solution. It's a minor annoyance, but I get annoyed when Windows complains about a print job that, as far as I know, came from nowhere. Any thoughts on why this would occur and how I could prevent it from happening?

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  • Why can't I create a Windows backup on my secondary disk?

    - by Brian Sullivan
    I've installed Windows 7 Ultimate on an SSD that I've added to the XPS desktop that I bought from Dell. I would like to use the built-in backup functionality to create incremental backups and store them on the large drive that came with the machine. I formatted the large drive and turned it into a Basic disk. However, when I try to set the backup location to the large internal disk (E:\) in the "Set up backup" wizard, a get a message saying, "A system image cannot be saved on a drive that your computer boots from or that Windows is installed on." Windows is not installed on that disk. I even deleted the OEM partition that was on the disk, and removed it completely from the boot order in the BIOS. Any clue why Windows is griping at me about this?

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  • Why does an EXE file that does *nothing* contain so many dummy zero bytes?

    - by Lambert
    Hi, I've compiled a C file that does absolutely nothing (just a main that returns... not even a "Hello, world" gets printed), and I've compiled it with various compilers (MinGW GCC, Visual C++, Windows DDK, etc.). All of them link with the C runtime, which is standard. But what I don't get is: When I open up the file in a hex editor (or a disassembler), why do I see that almost half of the 16 KB is just huge sections of either 0x00 bytes or 0xCC bytes? It seems rather ridiculous to me... is there any way to prevent these from occurring? And why are they there in the first place? Thank you!

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  • Why do some software not get load balanced even when there are multiple cores?

    - by Nav
    While VTune Analyzer was running on a blade server with 8 cores, I observed the cpu useage percentage using mpstat -P ALL 1. mpstat showed me that VTune was taking up 100% of a single core, while all other cores were idle. Why does that happen? Shouldn't the OS (RHEL Server 5.2) automatically distribute load across cores? The same happened when I tried running MATLAB (even after enabling multithreading support in the MATLAB settings). p.s: I'm a developer. Not a sys admin. So felt it better to ask here rather than at serverfault.

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