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  • Best (Java) book for understanding 'under the bonnet' for programming?

    - by Ben
    What would you say is the best book to buy to understand exactly how programming works under the hood in order to increase performance? I've coded in assembly at university, I studied computer architecture and I obviously did high level programming, but what I really dont understand is things like: -what is happening when I perform a cast -whats the difference in performance if I declare something global as opposed to local? -How does the memory layout for an ArrayList compare with a Vector or LinkedList? -Whats the overhead with pointers? -Are locks more efficient than using synchronized? -Would creating my own array using int[] be faster than using ArrayList -Advantages/disadvantages of declaring a variable volatile I have got a copy of Java Performance Tuning but it doesnt go down very low and it contains rather obvious things like suggesting a hashmap instead of using an ArrayList as you can map the keys to memory addresses etc. I want something a bit more Computer Sciencey, linking the programming language to what happens with the assembler/hardware. The reason im asking is that I have an interview coming up for a job in High Frequency Trading and everything has to be as efficient as possible, yet I cant remember every single possible efficiency saving so i'd just like to learn the fundamentals. Thanks in advance

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  • Brief Explanation of C Supersets?

    - by Ben Hooper
    I'm getting more and more confused in regards to C's supersets the further I venture into the programming world. There's just so many versions.. C, C++, C#, Objective-C, Objective-C++ and God knows what else. I only know tidbits about these languages (some are object-oriented, some are procedural, C was originally developed for UNIX, C++ started as an extension and is used primarily on the Windows OS, Objective-C is primarily used on Linux and Mac OS/iOS, etc), but I'm not even sure that what I know is correct. I would just like someone to shed some light on what I "know" - a little bit more information about which are successive versions, which platforms each are generally used on, which are the best versions to learn, etc if anyone is feeling generous. :) Thanks. :)

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  • javasrcipt asyncronous function

    - by Ben
    Hi there, i have a problem understanding how this could/should be solved. I have two functions. In the first function ( I call it loadData() ) I'm doing an asyncronous request to the server to load some data. In the second function ( saveData() ) I'm also doing an asyn request to the server to write some data. In the callback of this request I'm callin loadData() to refresh the data. Now the problem: In the saveData() function I want to wait for loadData() to be finished bevore I show a dialog (like alert('Data saved')) I guess this is a common problem, but I couldn't find the solution for it (if there is one..) A solution would be to make the requests syncronous, but the framework I'm using doesn't offer that and I hope there's a better solution.. Thanks to all!

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  • jQuery code not executing when DOM is ready

    - by Ben
    I have written a simple jQuery script that changes the hash tag of a link. I do this because I am using IntenseDebate comments in Wordpress but the comment link still links replaced id of the old comments. I'm using jQuery so that if javascript is enabled, the user can click on the comments link and it will take them to the IntenseDebate comments. If its not enabled it will take them to the traditional comments (because IntenseDebate requires javascript to function). The issue I'm having lies in this script to change the hash tag at the end of the link. Currently the URL "someurl.com/#respond" but I need the script to change it to "someurl.com/#comments". What is happening is that the script doesn't work, however I believe my syntax is correct so I decided to try copying and pasting the code into Firebug's console and the code executed perfectly. I could see that the link I was trying to change was now correct, and I could click on it and it worked as I desired. So what I don't understand is why the code is not executing when it is supposed to. I am using $(document).ready() and I have other jQuery on the page that executes just fine. I even tested it on a simple HTML page away from all the problems that might be caused by Wordpress and I received the same result. Does anyone know why this might be happening? Here is my code (I am using noConflict because Wordpress makes use of other frameworks): jQuery.noConflict(); jQuery(document).ready(function($) { $("a[href$='respond']").each(function() { this.href = this.href.replace("respond", "comments"); }); })(jQuery); Thanks very much for your help!

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  • How do I write to command line in c#?

    - by ben
    Hi I know how to write to console but if I write to console in my program and call my program from the command line it won't display anything. How do I make it so that when I say Console.WriteLine or Console.Out.Writeline ir prints to the command prompt from which it was called and not somewhere else? Once again I know how to do Console.WriteLine so it's not that :-p unless I'm doing it wrong. From what I can tell it's probably something to do with Console.SetOut(TextWriter t)

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  • Refresh Div with Jquery at fixed time

    - by Ben C
    I've got a php script that tells me when the next bus is due, and at the moment I'm refreshing this into a div, using jquery, every minute or so. Now, because I know the time at which the data will change (after the bus has come), I want it to refresh the div at this time (or just after, doesn't really matter). I should point out that I'm fairly new to js, but this is what I've got so far: var nextbustime = $('#bus').contents(); var nextbustime = new Date(nextbustime); var now = new Date(); var t = nextbustime.getTime() - now.getTime(); var refreshId = setTimeout(function() { $('#bus').fadeOut("slow").load('modules/bus.php?randval='+ Math.random()).fadeIn("slow"); }, t); The div is loaded originally with a php include. Naturally, what I've done doesn't work at all. Do I need some loops going on? Do I need to refresh the time calculator? Please please help! Thanks in advance...

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  • Pi/Infinite Numbers

    - by Ben Shelock
    I'm curious about infinite numbers in computing, in particular pi. For a computer to render a circle it would have to understand pi. But how can it if it is infinite? Am I looking too much into this? Would it just use a rounded value?

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  • C - fork() and sharing memory

    - by Ben
    I need my parent and child process to both be able to read and write the same variable (of type int) so it is "global" between the two processes. I'm assuming this would use some sort of cross-process communication and have one variable on one process being updated. I did a quick google and IPC and various techniques come up but I don't know which is the most suitable for my situation. So what technique is best and could you provide a link to a noobs tutorial for it. Thanks.

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  • displayed value - in-place-editor

    - by Ben
    So I put in in-place editing for one of my models. One of the attributes is PRICE. I used the to_currency method to format the value before it is displayed. The problem I'm having is that with the in-place editor, I just can't figure out how to set a custom display value. I'm trying to get the price to display as $20.00 until it is clicked, but the in place editor displays 20.0..

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  • Facebook Card Game? Which architecture?

    - by Ben
    I am developing a Facebook Card Game for my thesis and i am wondering which architecture fits best? I am going to develop the game using Silverlight + ASP.NET. On the one side the game should contain player vs. player card games. On the other there will be also a lot of contant similar to Mafia Wars(or any other game like that) where you just interact with the server (incl. database) I read a lot about ASP.NET MVC, Silverlight MVVM and that stuff. But what fits best for a game like that? Also i am not sure if i should go with Silverlight 4 already? I don't want to start the wrong way. I really appreciate your help.

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  • JSF/HTML - Add a Java applet to web page programmatically.

    - by Ben
    Theres a web page I'm making which content is very dynamic and so I'm building it from inside the backing bean. I would like to add a Java applet to the web page but I could not find the JSF component type to correspond to the <applet> tag. So My questions are - What is the JSF component type for an applet? How did you find it? (For similar future searches) Thanks! P.S - Just to be clear. An example: <h:PanelGroup> would be HtmlPanelGroup as a java object.

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  • Centre content vertically in a <div>

    - by Ben
    Hi, this is probably very simple to do, but I can't quite get it right. I have a <div> which contains two <a> tags. I would like the <a> tags to be both centred vertically and horizontally. I have set them to centre horizontally by setting the text-align:center; on the div, but can't figure out how to vertically centre them. How would I go about doing this? Thanks.

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  • Which bug in the Delphi IDE / VCL do you despise the most?

    - by Ben Daniel
    I've been working in Delphi 7 for the last 6 years now and have learnt to merely submit to the instablity of the IDE. For example, there are particular projects I've inherited which, when working on, I cannot use the CTRL+SPACE dropdown symbol list in the Delphi editor without getting an Access Violation error, this would easily top my list but there are many more. I'd like to know which bugs frustrate you the most.

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  • Images not displaying if using file:///c:/

    - by Ben
    I am using jQuery and would like to display the images from my PC, rather than hosting them. I have the following: /* works fine: */ .ui-widget-header .ui-icon { background-image: url(images/ui-icons_2e83ff_256x240.png); } /* does not work: */ .ui-widget-header .ui-icon { background-image: url(file:///C:/ui-icons_2e83ff_256x240.png); } When I put file:///C:/ui-icons_2e83ff_256x240.png in a browser, it displays the actual image beautifully. Both locations are valid image locations. Could this not working be to do with the image being a sprite? Does anyone have any ideas on this one? Many thanks.

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  • [VB.Net] String Manipultation - Get String between two other Strings?

    - by Ben
    I have a large piece of text in which there is something simular to this: !#_KT_#!COMMANDHERE!#_KT_#! I want, in VB.Net, to get the 'COMMANDHERE' part of the string, how would I go about doing this? I have this so far: Dim temp As String = WebBrowser1.Document.Body.ToString Dim startIndex As Integer = temp.IndexOf("!#__KT__#!") + 1 Dim endIndex As Integer = temp.IndexOf("!#__KT__#!", startIndex) Dim extraction As String = temp.Substring(startIndex, endIndex - startIndex).Trim TextBox1.Text = extraction However this only removes the LAST string eg: #_KT_#! COMMAND. Any help is appreciated!

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  • Does anyone else think instance variables are problematic in database-backed applications?

    - by Ben Aston
    It occurs to me that state control in languages like C# is not well supported. By this, I mean, it is left upto the programmer to manage the state of in-memory objects. A common use-case is that instance variables in the domain-model are copies of information residing in persistent storage (i.e. the database). Clearly this violates the single point of authority principle, and "synchronisation" has to be managed by the developer. I envisage a system where instead of instance variables, we have simple public access/mutator methods marked with attributes that link them to the database, and where reads and writes are mediated by a framework that decides whether to hit the database. Does such a system exist? Am I completely missing the point, or is there some truth to this idea?

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  • RenderPattern headache with WSS 3.0 Document Library

    - by Ben
    Hi All, I'm trying to define the DisplayPattern of a custom field to do as follow. It's a simple text field used in document libraries, but i want the text entered to be displayed as a link to the document in the list view. <URL Cmd="Display"> gives me the display form, but I want the link to actually download/open the document... I can't for the life of me figure this one out... Thanks for your help!

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  • Bind event to shape on canvas

    - by Ben Shelock
    How can I bind an event to a shape drawn on a canvas? I presumed this would work but I get an error. <html> <head> <script type="application/javascript"> function draw() { var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.fillStyle = "rgb(200,0,0)"; var rec = ctx.fillRect (0, 0, 55, 50); rec.onclick = function(){ alert('something'); } } </script> </head> <body onLoad="draw()"> <canvas id="canvas" width="300" height="300"></canvas> </body> </html>

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  • Scheme open source projects?

    - by Ben
    Hi I'm learning scheme and was wondering if there are any active open-source projects I might be able to get involved in? I'm nearing the end of SICP and although this has good complex examples no textbook code compares to real-world applications. eg testing code / benchmarking / revision control styles / sheer size and scope etc. Hence my curiousity at seeing a project in the wild. I tried searching google code but only found projects that are interpreters that implement RSR5/6. Perhaps there are not many projects out there and I should consider scala?! Advice or even pointers to specific projects appreciated.

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