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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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  • How can I create a generic constructor? (ie. BaseClass.FromXml(<param>)

    - by SofaKng
    I'm not sure how to describe this but I'm trying to create a base class that contains a shared (factory) function called FromXml. I want this function to instantiate an object of the proper type and then fill it via an XmlDocument. For example, let's say I have something like this: Public Class XmlObject Public Shared Function FromXml(ByVal source as XmlDocument) As XmlObject // <need code to create SPECIFIC TYPE of object and return it End Function End Class Public Class CustomObject Inherits XmlObject End Class I'd like to be able to do something like this: Dim myObject As CustomObject = CustomObject.FromXml(source) Is this possible?

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  • Definition of variables/fields type within a constructor, how is it done?

    - by elementz
    I just had a look at Suns Java tutorial, and found something that totally confused me: Given the following example: public Bicycle(int startCadence, int startSpeed, int startGear) { gear = startGear; cadence = startCadence; speed = startSpeed; } Why is it, that the types of the variables (fields?) gear, cadence and speed do not need to be defined? I would have written it as follows: public Bicycle(int startCadence, int startSpeed, int startGear) { int gear = startGear; int cadence = startCadence; int speed = startSpeed; } What would be the actual differnce?

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  • When exactly is constructor of static local object called?

    - by Honza Bambas
    Say we have a code like this: Some class { Some() { // the ctor code } }; Some& globalFunction() { static Some gSome; return gSome; } When exactly 'the ctor code' is executed? As for normal static variables before main() or at the moment we first call to 'globalFunction()'? How is it on different platforms and different compilers (cl, gcc, ...) ? Thanks -hb-

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  • fastest way to copy a table in mysql

    - by Anon
    which one is the fastest way to completely copy a table on mysql ? CREATE TABLE copy LIKE original; INSERT INTO copy SELECT * FROM original; or CREATE TABLE copy SELECT * FROM original; ALTER TABLE copy ADD PRIMARY KEY (id); or theres another way ? PS. can't use command-line tools like mysqldump, must be on-the-fly.

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  • Using an interface as a constructor parameter in Java?

    - by aperson
    How would I be able to accomplish the following: public class testClass implements Interface { public testClass(Interface[] args) { } } So that I could declare Interface testObject = new testClass(new class1(4), new class2(5)); Where class1 and class2 are also classes that implement Interface. Also, once I accomplish this, how would I be able to refer to each individual parameter taken in to be used in testClass? Thanks :)

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  • Copy a multi-dimentional array by Value (not by reference) in PHP.

    - by Simon R
    Language: PHP I have a form which asks users for their educational details, course details and technical details. When the form is submitted the page goes to a different page to run processes on the information and save parts to a database. HOWEVER(!) I then need to return the page back to the original page, where having access to the original post information is needed. I thought it would be simple to copy (by value) the multi-dimensional (md) $_POST array to $_SESSION['post'] session_start(); $_SESSION['post'] = $_POST; However this only appears to place the top level of the array into $_SESSION['post'] not doing anything with the children/sub-arrays. An abbreviated form of the md $_POST array is as follows: Array ( [formid] = 2 [edu] = Array ( ['id'] = Array ( [1] = new_1 [2] = new_2 ) ['nameOfInstitution'] = Array ( [1] = 1 [2] = 2 ) ['qualification'] = Array ( [1] = blah [2] = blah ) ['grade'] = Array ( [1] = blah [2] = blah ) ) [vID] = 61 [Submit] = Save and Continue ) If I echo $_SESSION['post']['formid'] it writes "2", and if I echo $_SESSION['post']['edu'] it returns "Array". If I check that edu is an array (is_array($_SESSION['post']['edu])) it returns true. If I echo $_SESSION['post']['edu']['id'] it returns array, but when checked (is_array($_SESSION['post']['edu]['id'])) it returns false and I cannot echo out any of the elements. How do I successfully copy (by value, not by reference) the whole array (including its children) to an new array?

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  • How can I concisely copy multiple SQL rows, with minor modifications?

    - by Steve Jessop
    I'm copying a subset of some data, so that the copy will be independently modifiable in future. One of my SQL statements looks something like this (I've changed table and column names): INSERT Product( ProductRangeID, Name, Weight, Price, Color, And, So, On ) SELECT @newrangeid AS ProductRangeID, Name, Weight, Price, Color, And, So, On FROM Product WHERE ProductRangeID = @oldrangeid and Color = 'Blue' That is, we're launching a new product range which initially just consists of all the blue items in some specified current range, under new SKUs. In future we may change the "blue-range" versions of the products independently of the old ones. I'm pretty new at SQL: is there something clever I should do to avoid listing all those columns, or at least avoid listing them twice? I can live with the current code, but I'd rather not have to come back and modify it if new columns are added to Product. In its current form it would just silently fail to copy the new column if I forget to do that, which should show up in testing but isn't great. I am copying every column except for the ProductRangeID (which I modify), the ProductID (incrementing primary key) and two DateCreated and timestamp columns (which take their auto-generated values for the new row). Btw, I suspect I should probably have a separate join table between ProductID and ProductRangeID. I didn't define the tables. This is in a T-SQL stored procedure on SQL Server 2008, if that makes any difference.

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  • C Programming. How to deep copy a struct?

    - by user69514
    I have the following two structs where "child struct" has a "rusage struct" as an element. Then I create two structs of type "child" let's call them childA and childB How do I copy just the rusage struct from childA to childB? typedef struct{ int numb; char *name; pid_t pid; long userT; long systemT; struct rusage usage; }child; typedef struct{ struct timeval ru_utime; /* user time used */ struct timeval ru_stime; /* system time used */ long ru_maxrss; /* maximum resident set size */ long ru_ixrss; /* integral shared memory size */ long ru_idrss; /* integral unshared data size */ long ru_isrss; /* integral unshared stack size */ long ru_minflt; /* page reclaims */ long ru_majflt; /* page faults */ long ru_nswap; /* swaps */ long ru_inblock; /* block input operations */ long ru_oublock; /* block output operations */ long ru_msgsnd; /* messages sent */ long ru_msgrcv; /* messages received */ long ru_nsignals; /* signals received */ long ru_nvcsw; /* voluntary context switches */ long ru_nivcsw; /* involuntary context switches */ }rusage; I did the following, but I guess it copies the memory location, because if I changed the value of usage in childA, it also changes in childB. memcpy(&childA,&childB, sizeof(rusage)); I know that gives childB all the values from childA. I have already taken care of the others fields in childB, I just need to be able to copy the rusage struct called usage that resides in the "child" struct.

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  • Shallow Copy vs DeepCopy in C#.NET

    Hope below example helps to understand the difference. Please drop a comment if any doubts. using System; using System.IO; using System.Runtime.Serialization.Formatters.Binary; namespace ShallowCopyVsDeepCopy {     class Program     {         static void Main(string[] args)         {             var e1 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } };             var e2 = e1.ShallowClone();             e1.Department.DeptName = "Accounts";             Console.WriteLine(e2.Department.DeptName);             var e3 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } };             var e4 = e3.DeepClone();             e3.Department.DeptName = "Accounts";             Console.WriteLine(e4.Department.DeptName);         }     }     [Serializable]     class Dep     {         public int DeptNo { get; set; }         public String DeptName { get; set; }     }     [Serializable]     class Emp     {         public int EmpNo { get; set; }         public String EmpName { get; set; }         public Dep Department { get; set; }         public Emp ShallowClone()         {             return (Emp)this.MemberwiseClone();         }         public Emp DeepClone()         {             MemoryStream ms = new MemoryStream();             BinaryFormatter bf = new BinaryFormatter();             bf.Serialize(ms, this);             ms.Seek(0, SeekOrigin.Begin);             object copy = bf.Deserialize(ms);             ms.Close();             return copy as Emp;         }     } } span.fullpost {display:none;}

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  • Remove urls to unidex blog content from google, then copy blogs content to new blog [closed]

    - by sam
    Possible Duplicate: migrating PR / rankings from one site to another Ive been writing a blog for the past yr or so, with about 300 published articles, the blog have been running under a subdomain blog.mysite.com We are no looking to change the url of our site, so the blog is going to have to be ported over to a subdoamin on the new site. We would really like to keep the backlog / archive of all the articles we have written but dont wont to be penalized for having duplicate content, could we just remove / unindex the urls from google in webmaster tools then export the blog and import it back to our new blog ? Would google still see this a duplicate content or becuase ive removed the urls have they no longer got a copy of it ? thanks

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  • Copying & Pasting Rows Between Grids in SQL Developer

    - by thatjeffsmith
    Apologies for slacking on the blogging front here lately. Still mentally hung over from Open World, and lots of things going on behind the scenes here in Oracle-land. Whilst (love that word) blogging is part of my job, it’s not the ONLY part of my job So a super-quick and dirty ‘trick’ this morning. Copying Query Result Record as New Row in Table Copy and paste is something everyone ‘gets.’ I don’t know we have to thank for that, whether it’s Microsoft or Xerox, but it’s been ingrained in our way of dealing with all things computers. Almost to the detriment of some of our users – they’ll use Copy and Paste when perhaps our Export feature is superior, but I digress. Where it does work just fine is when you want to create a new row in your table that matches a row you have retrieved from an executed query. Just click in the gutter or row number to get the entire row selected Once you have your data selected, do your thing, i.e. ctrl+C or Command/Apple+C or whatever. Now open your view or table editor, go to the data page, and ask for a new row. New record, no data Paste in the data from the clipboard. It’s smart enough to paste the separate values out to the separate columns. The clipboard saves the day, again. If your columns orders are different, just change the order in the grids. If you have extra information, don’t copy the entire row. I know, I know – Jeff this is too simple, why are you wasting our time here? It seems intuitive, but how many of you actually tried this before reading it just now? I seem to get more positive feedback from the very basic user interface 101 tips than the esoteric click-click-click-ctrl-shift-click tricks I prefer to post. Lots of interesting stuff on tap, so stay tuned!

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  • Hard-copy approaches to time tracking

    - by STW
    I have a problem: I suck at tracking time-on-task for specific feature/defects/etc while coding them. I tend to jump between tasks a fair bit (partly due to the inherit juggling required by professional software development, partly due to my personal tendancy to focus on the code itself and not the business process around code). My personal preference is for a hard-copy system. Even with gabillions of pixels of real-estate on-screen I find it terribly distracting to keep a tracking window convienient; either I forget about it or it gets in my ways. So, looking for suggestions on time-tracking. My only requirement is a simple system to track start/stop times per task. I've considered going as far as buying a time-clock and giving each ticket a dedicated time-card. When I start working on it, punch-in; when done working, punch-out.

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  • Modernising settings, packages

    - by Sam Brightman
    The update manager (possibly combined with the janitor) does a reasonable job of bringing packages up to date with a new release, removing ones that are replaced by different projects etc. However, I'm left with the lingering feeling that quite a few settings are lingering from old releases. For example, some packages may be left around that I installed myself whereas now the functionality is provided by default. Another example is that my user doesn't get the new theme, and the panel bar is a mess. I can compare against an inactive user on the same system: everything seems tidier. There are also things like the explosion of System Preferences, user groups (inactive user, more recently created, is in groups that the older, active user isn't). In other areas (e.g. default font) I do seem to get given the new defaults. Another example is Spotlight-equivalent search. I remember Beagle and Tracker, I remember removing tracker when it used all system RAM and swap for 2 entire release cycles, but I don't know what I'm "supposed" to be using now. Is there even a default indexing-search installed and exposed? aptitude install ubuntu-desktop doesn't do anything, so the basics are in place package-wise. Is there any way to update my settings to the modern "Ubuntu way" without reinstalling from scratch? Can I do so selectively i.e. show the differences? Most of the time package management on Linux is an absolute joy compared to the alternatives, but if the desktop gets messed up after only a release or two, we're back to reinstalling just like Windows.

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  • A command-line clipboard copy and paste utility?

    - by Peter.O
    In Windows I used command-line clipboard copy-and-paste utilities... pclip.exe and gclip.exe These were UnixUtils ports for Windows (but they only handled plain text). There were a couple of other native Windows utils which could write/extracy any format. I've looked for something similar in Synaptic Package Manager, but I can't find anything. Is there something there, that I've missed? ... or maybe this is available in bash scripting? The type of utility I'd like will be able to read/write via std-in/std-out or file-in/file-out, and handle Unicode/Rich-text/Picture/etc clipboard formats... Late Edit: NB: I'm not after a clipboard manager.

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  • Is it legal to ask photo ID and credit card copy in the U.S

    - by selim
    I regularly order from online shops around the world and I have not see any case where the company asks for photo ID or credit card copy. Yesterday I make an order from linode.com and my order is on hold because of their "fraud check system". Is it common to ask those info in U.S. where I have never asked such info in here (Istanbul, Turkey). And I already asked what is their motive and legal stand and the reason my order is hold by their fraud system. And I also added whether is because I live in Istanbul, Turkey. Their answer was as following: "We would not be able to disclose specific information related to our fraud system." And I'm asked repeatedly whether I want to cancel my order or not. I dont questioning reputation of linode.com if I think so, I did not make an order. I think asking for photo ID is neither legal nor provide any security.

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  • How do I get an application to appear as a choice in update-alternatives?

    - by Jay
    I separately installed the Firefox Beta and Alpha channels, and have desktop configuration files pointing to them in ~/.local/share/applications. However, stable Firefox is being used as my default browser by the system. (Firefox Beta used to be used until I messed with the "Default Applications" in System Settings, where it is not listed.) I tried running sudo update-alternatives --config x-www-browser to manually change it, but it's only recognizing Chromium and Firefox (stable) and showing them as a choice. What can I do to get custom desktop configuration files in ~/.local/share/applications to be seen as default alternatives? I think I may have to fiddle with the desktop config files, or with mimeinfo.cache or mimeapps.list? Running Oneiric. Here is the content of the firefox-beta.desktop file I created: [Desktop Entry] Name=Firefox Beta Exec=firefox-beta -P Beta -no-remote Icon=firefox Terminal=false X-MultipleArgs=false Type=Application StartupNotify=true StartupWMClass=Firefox Categories=GNOME;GTK;Network;WebBrowser; Comment[en_US]=Firefox Beta Channel MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/vnd.mozilla.xul+xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm; Name[en_US]=Firefox Beta [NewWindow Shortcut Group] Name=Open a New Window Exec=firefox-beta -new-window about:blank TargetEnvironment=Unity

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  • Using a back-end mechanism to copy files to DB and notify the application

    - by BDotA
    This Scenario: User copies large files to a local folder. I want to watch that folder and when a new file is dropped then go and copy it to Database, so later when coping is done I can actually use it in my application. ( A C# WinForms App). It would be awesome to also find a way to somehow get notified in the Application that hey copying the file to DB is finished and ready for use... I am using C#.net, Windows... What solutions/architecture do you suggest for this? For example having a windows service running all the time watching that folder, when something copied goes and write it to DB ... then how about getting notified? MSMQ is something I can use? don't know much about it yet. Thanks.

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  • Moving Ubuntu to a new hdd

    - by jaurisan
    I have a 300gb hdd which I am currently using on my older PC. Now I want to have a copy of those 300GB into a new 1TB hdd (installed in a new computer). My "problem" is that the 1TB hdd already has a 50GB partition with a Win XP (the rest of the space is not partitioned). The 300GB disk has a 240GB partition for Ubuntu, and the rest is a FAT partition which I don't care if it gets copied or not to the new disk. So how can I transfer the entire Ubuntu to the new hard disk and still being able to boot the XP? Is there a way or tool that can help me do over LAN? So I wont have to take out the hdd from the new pc and put it in the older to do the copy.

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  • Shallow Copy vs DeepCopy in C#.NET

    Hope below example helps to understand the difference. Please drop a comment if any doubts. using System; using System.IO; using System.Runtime.Serialization.Formatters.Binary; namespace ShallowCopyVsDeepCopy {     class Program     {         static void Main(string[] args)         {             var e1 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } };             var e2 = e1.ShallowClone();             e1.Department.DeptName = "Accounts";             Console.WriteLine(e2.Department.DeptName);             var e3 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } };             var e4 = e3.DeepClone();             e3.Department.DeptName = "Accounts";             Console.WriteLine(e4.Department.DeptName);         }     }     [Serializable]     class Dep     {         public int DeptNo { get; set; }         public String DeptName { get; set; }     }     [Serializable]     class Emp     {         public int EmpNo { get; set; }         public String EmpName { get; set; }         public Dep Department { get; set; }         public Emp ShallowClone()         {             return (Emp)this.MemberwiseClone();         }         public Emp DeepClone()         {             MemoryStream ms = new MemoryStream();             BinaryFormatter bf = new BinaryFormatter();             bf.Serialize(ms, this);             ms.Seek(0, SeekOrigin.Begin);             object copy = bf.Deserialize(ms);             ms.Close();             return copy as Emp;         }     } } span.fullpost {display:none;}

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  • How can I programmatically change the keyboard layout?

    - by Jason R. Coombs
    I want to run a shell command or script that will configure each of my Ubuntu Precise boxes to use the Dvorak keyboard layout as the default (and only) layout. With earlier versions, I was able to set the XKBVARIANT in /etc/default/keyboard but when I make this change in Precise (and reboot), the keyboard layout appears to be unaffected (both in console and in gnome). I tried also setting the XKBMODEL to pc105 and XKBLAYOUT to us, but that did not seem to help. I know I can set the layout for gnome using the 'keyboard layout' tool... but I want the change to affect the console, and I want to automate the process. How can I accomplish this? Edit: To clarify, I want to know how I can cause to change (using only a script or command-line) the keyboard layout to be Dvorak as the default and only keyboard layout for both Gnome and the console. I want this change to be persistent (survive reboots), just as it is when the change is made through the Keyboard Layout tool. Edit: Let me put it another way. If I had installed the operating system myself (which I did not because the OS was installed by the virtual machine infrastructure), I could have selected the desired keyboard layout at install time, and that layout would be applied persistently, system-wide. How can I change the layout to appear as if I had set it during the install process?

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  • Copy a Ubuntu install?

    - by Hailwood
    So short story is that I am wanting to grab my ubuntu install, back up to an external disk, delete everything from my hdd, repartition my hdd, put my ubuntu install back. Long story is. I finally got my recovery discs, so I do not need to recovery partitions, not the mention my hdd is kinda messy, So I am going to wipe it and put everything back. Thing is I don't want to have to re-install everything, I would rather just copy/paste my ubuntu install if possible. Oh, What I should also mention is that I will be dual booting windows!

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  • Updated copy of the OBIEE Tuning whitepaper

    - by inowodwo
    The Product Assurance team have released an updated copy of the OBIEE Tuning Whitepaper. You can find it on the PA blog https://blogs.oracle.com/pa/entry/test or via Support note OBIEE 11g Infrastructure Performance Tuning Guide (Doc ID 1333049.1) https://support.us.oracle.com/oip/faces/secure/km/DocumentDisplay.jspx?id=1333049.1&recomm=Y This new revised document contains following useful tuning items: 1.    New improved HTTP Server caching algorithm. 2.    Oracle iPlanet Web Server tuning parameters. 3.    New tuning parameters settings / values for OPIS/OBIS components.

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