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  • Having trouble with a small example from school

    - by Kalec
    The example is from a course, it's for comparing two objects in java: public class Complex { ... public boolean equals (Object obj) { if (obj instanceof Complex) { // if obj is "Complex" (complex number) Complex c = (Complex) obj // No idea return (real == c.real) && (imag == c.imag); // I'm guessing real means [this].real } return false; } } So, my question is: "what does this: Complex c = (Complex) obj actually mean" ? Also I've worked with python and c++, java is new for me.

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  • Page expiration after postback in ASP.NET

    - by Achilles
    I've been doing web development for a while and have yet to read a good answer to this question: Given a page that executes transactions through a postback, how do you prevent the user from duplicating the transaction when they do something as simple as hit the back button? I've explored trying expire the cache but I must admit I'm lacking in my understanding of ASP.NET caching. What is the approach I should use to make the old request stale and invalid? Thanks!

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  • how does object programming work?

    - by venom
    Hello, I am not sure about some things in oop. If I have Class1, which has some private field, for example private Field field1, and make getField1(){return field1;} then I have some class with constructor public Class2(Field field){someMethod(field);} And then I call constructor of Class2 in Class3 like: Class2 cl = new Class2(instanceOfClass1.getField1()); And now the question: Am I working with field1 of instanceOfClass1 in "someMethod(field)"?

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  • JSF trimming white spaces

    - by msharma
    HI, I have an input field in which I want to trim any leading/trailing whitespaces. We are using JSF and binding the input field to a backing bean in the jsp using: <h:inputText id="inputSN" value="#{regBean.inputSN}" maxlength="10"/> My question is that besides validation can this be done in the jsp? I know we can also do this using the trim() java function in the Handler, but just wondering if there is a more elegant way to achieve this in JSF. Thanks.

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  • php mysql array - insert array info into mysql

    - by Michael
    I need to insert mutiple data in the field and then to retrieve it as an array. For example I need to insert "99999" into table item_details , field item_number, and the following data into field bidders associated with item_number : userx usery userz Can you please let me know what sql query should I use to insert the info and what query to retrieve it ? I know that this may be a silly question but I just can't figure it out . thank you in advance, Michael .

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  • How to split a git repository while preserving subdirectories?

    - by Thomas
    What I want is similar to this question. However, I want the directory that is split into a separate repo to remain a subdirectory in that repo: I have this: foo/ .git/ bar/ baz/ qux/ And I want: foo/ .git/ bar/ baz/ quux/ .git/ qux/ # Note: still a subdirectory How to do this in git? I could use the method from this answer if there is some way to move all the new repo's contents into a subdirectory, throughout history.

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  • postgres - regex_replace in distinct clause?

    - by n00b0101
    Ok... changing the question here... I'm getting an error when I try this: SELECT COUNT ( DISTINCT mid, regexp_replace(na_fname, '\\s*', '', 'g'), regexp_replace(na_lname, '\\s*', '', 'g')) FROM masterfile; Is it possible to use regexp in a distinct clause like this? The error is this: WARNING: nonstandard use of \\ in a string literal LINE 1: ...CT COUNT ( DISTINCT mid, regexp_replace(na_fname, '\\s*', ''...

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  • Is Pharo just a repackaging/rebranding of Squeak?

    - by number5
    I'm trying to learn some Smalltalk. Fisrt found was Squeak, but since it has been removed from Gentoo ebuild tree because of security problem, so I decided to find an alternative. Then I found Pharo through Seaside project, after I downloaded Pharo 1.0 package, there are actually a SqueakVM inside! So, my question is: Is Pharo just a repackaging/rebranding of Squeak? And are those security problem of Squeak (bundle unsecure libs) still applied to Pharo? Thanks!

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  • In terms of loss of volume or corruption, is failure probability of an Amazon EBS volume 'x', indepe

    - by Tony Morgan
    In terms of loss of volume or corruption, is failure probability of an Amazon EBS* volume 'x', independent of the failure of another volume 'y'. Amazon states[1] AFR** of between 0.1%-0.5%, lets say 0.5%, 0.005. To restate the question is the AFR composed of two EBSs mirrored actually 0.005*0.005 = 0.000025? To be clear I'm not interested in high availability here, just very high durability. *EBS = elastic block storage (amazons persistant disks) **AFR = annual failure rate. [1] http://aws.amazon.com/ebs/

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  • Listings in Latex with UTF-8 (or at least german umlauts)

    - by Janosch
    Trying to include a source-file into my latex document using the listings package, i got problems with german umlauts inside of the comments in the code. Using \lstset{ extendedchars=\true, inputencoding=utf8x } Umlauts in the source files (encoded in UTF-8 without BOM) are processed, but they are somehow moved to the beginning of the word they are contained in. So // die Größe muss berücksichtigt werden in the input source file, becomes // die ößGre muss übercksichtigt werden in the output file. NOTE: since i found errors in my initial setup, i heavily edited this question

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  • replacing div content with a click using jquery

    - by Joel
    I see this question asked a lot in the related questions, but my need seems very simple compared to those examples, and sadly I'm just still too new at js to know what to remove...so at the risk of being THAT GUY, I'm going to ask my question... I'm trying to switch out the div contents in a box depending on the button pushed. Right now I have it working using the animatedcollapse.toggle function, but it doesn't look very good. I want to replace it with a basic fade in on click and fade in new content on next button. Basic idea: <div> <ul> <li><a href="this will fade in the first_div"></li> <li><a href="this will fade in the second_div"></li> <li><a href="this will fade in the third_div"></li> </ul> <div class="first_container"> <ul> <li>stuff</li> <li>stuff</li> <li>stuff</li> </ul> </div> <div class="second_container"> <ul> <li>stuff</li> <li>stuff</li> <li>stuff</li> </ul> </div> <div class="third_container"> <ul> <li>stuff</li> <li>stuff</li> <li>stuff</li> </ul> </div> </div> I've got everything working with the animated collapse, but it's just an ugly effect for this situation, so I want to change it out. Thanks! Joel

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  • Retrieve backlink infos from linked image generated by php

    - by aSeptik
    Hi All mates! This time ask you this question: Assuming we have this img ( generated by php ) linked in clients sites <img src="http://mysite.com/genimg.php?id=2" alt=""/> Is Possible to get back from the client location some infos!? ( es. client url ) PS: don't need something that open the entire client page and search for link! don't need something that work just if the link image is clicked!

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  • Customizing the look of S3 expiring urls

    - by Gregoriy
    Creating expiring links for Amazon S3 buckets, could I somehow change the name of AWSAccessKeyId to something else (to custom it, to speak so) so that not to disclose the use of Amazon in my web applications? For now, it looks like so: http://video.mysite.com/T154456.flv?AWSAccessKeyId=1ESOMESPECIALIDJJAKJ6RA82&Expires=1241372284&Signature=ddfr%2BlkoSEPAL%2BGbMwlMzj6q%2BCY%3D Or, in order to not open another question, what are other (tricky?) ways to expire S3 links without the use of proxy?

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  • OO implementation of RFC 2445

    - by Dave Jarvis
    Question What PHP library would you recommend for attaching meeting notices to email? Preference given to: Swift Mailer integration Simple Object-Oriented library Application Scheduling of appointments for medical clinics. After the user books an appointment, it would be great to send the meeting notice to their email address (upon request, of course). Thank you!

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  • NSPredicate and arrays

    - by bend0r
    Hello, I've got a short question. I have an NSArray filled with Cars (inherits from NSObject) Car has the @property NSString *engine (also regarded @synthesize ...) Now I want tu filter the array using NSPredicate predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"(engine like %@)", searchText]]; newArray = [ArrayWithCars filteredArrayUsingPredicate:predicate]; This throws an valueForUndefinedKey error. Is the predicateWithFormat correct? thanks for your responses

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  • Display output in HTML format by perl

    - by aladine
    Hi, I have a hashmap with some information(key and value) in a perl file. I want to display them in HTML output and each displayed (key, value) will link to something. When I click the link then there will be some information there. Anyone suggests me how can I do that. Is this similar to creating a CGI file and use CGI.pm? I will update more detail on this question later.

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  • Any good tutorials on using OAuth with Piston?

    - by Hank Gay
    I've looked at the relevant section of the Piston documentation, but it only seems to focus on how to turn it on, not what it would look like for clients or how to test it to verify it's working. The example only seems to use HTTP Basic and curl. Finally, Ned Batchelder's question makes it look like a tutorial is in order. Thanks.

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  • ebook reader for programming books?

    - by Martin
    Are the current ebook readers good enough for reading programming books (containing diagrams, source-code, screenshots, and so on)? How good are the search functions or the possibilities to set bookmarks, to use a book as a reference? I'd like to hear opinions of ebook reader owners to help me decide whether or not I should buy an ebook reader. (I know this question already exists, but it's over one year old and new ebook readers are now available)

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