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• Efficient Algorithm for Recording gameplay's objects positions

  - by Scorch

  So, I have a game idea in mind, and for that I need to record the game around the player. I'me not talking about recording it as video, but rather recording the scene objects, and their positions within the game, and then render them, giving the player the ability to go back and forth, to stop time and move around. I've made a prototype with some data structures in C#, since this is going to be the programming language we'll be using in our game, but if we want the player to be able to go back just five minutes back with the data of just 100 NPC's, it takes almost 1GB of RAM. Right now, I'm just storing a Doubly linked list, each item with the object position. In the game, I'll need to store even more data in each node, so I need something even more ligher. Of course, this algorithm is zero optimized, but still, that is a lot. The alternatives would be create the NPC's that aren't really important to the game when the user is viewing the past, but I don't really like it very much for the sake of realism. I wonder if there is a better way to store this? Thanks in advance, Scorch

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• How could there still not be a mysqldb module for Python 3? [closed]

  - by itsadok

  This SO question is now more than two years old. MySQL is an incredibly popular database engine, Python is an incredibly popular programming language, and Python 3 has been officially released two years ago, and was available even before that. What's more, the whole mysqldb module is just a layer translating Python's db-api to MySQL's API. It's not that big of a library. I must be missing something here. How come almost* nobody in the entire open source community has spent the (I'm guessing) two weeks it takes to port this lib? Is Python 3 that unpopular? Is the combination of python and mysql not as common as I assume? Or maybe it's just a lot harder to port mysqldb than I assume? Anyone know the inside story on this? * Now I see that this guy has done it, which takes some of the wind out of my question, but it still seems to little and too late to make sense. EDIT: OK, I'm aware that the stock answers for these kind of questions cover this one as well. Patches welcome, scratch your itch, we don't work for you and we don't have the time, etc. I actually took a shot at porting this about a year ago, but it was my first time doing anything with Python C extensions, and I failed. My point in writing this was not a plea for somebody to write it, but genuine curiosity: it seems that some much more complicated libraries have been ported to python 3 already, and in the poll for which libraries should be ported, mysqldb is not even nominated! That suggests that maybe (2) is the right answer. UPDATE: I found that there are several new libraries that provide mysql support under Python 3, I just wasn't googling hard enough. That explains everything.

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• Managing game objects/components

  - by Xeon06

  Good day everyone, By far the biggest problem that has always dawned on my when programming games is how to structure my code. It just becomes an incredible mess after a while. The reason for that is because I have no idea how different classes should interact with each other. Let's have an example. Say I have a class Player, a class PlayerInput and a class Map. The player class contains information as to the location of the player, whereas the player input class handles changing that location, but by first making sure it's within a walkable area from the map class. How to structure this? My usual approach is to pass those components as parameters in the constructors of the parameters that need them, like so: var map = new Map(); var player = new Player(); var input = new PlayerInput(player, map); The problem with that is that it quickly gets messy, when you add new components you have to go through your constructors and update them, and it doesn't work well if you have mirroring references: var physics = new Physics(input); //Oops, doesn't work var input = new Input(physics); So, how do you guys usually manage this? Thanks.

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• Is it too late to start your career as a programmer at the age of 30 ?

  - by Matt

  Assuming one graduated college at 30 years old and has 5 years of experience (no real job experience, just contributing to open source and doing personal projects) with various tools and programming languages, how would he or she be looked upon by hiring managers ? Will it be harder to find a job considering that (I got this information looking at various websites, user profiles on SO and here, etc.) the average person gets hired in this field at around 20 years old. I know that it's never too late to do what you're passionate about and the like but sometimes it is too late to start a career. Is this the case? Managers are always looking for fresh people and I often read job descriptions specifically asking for young people. I don't need answers of encouragement, I know the community here is great and I wouldn't get offended by even the most cold answers. Please don't close this as being too localized, I'm not referring to any specific country or region, talk about the region you're in. I would also appreciate if you justified your answer.

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• Free movement in a tile-based isometric game

  - by xtr486

  Is there a reasonable easy way to implement free movement in a tile-based isometric game? Meaning that the player wouldn't just instantly jump from one tile to another or not be "snapped" to the grid (for example, if the movement between tiles were animated but you'd be locked from doing anything before the animation finishes). I'm a really beginner with anything related to game programming, but with the help of this site and some other resources it was quite easy to do the basic stuff, but I haven't been able to find any useful resources for this particular problem. Currently I've improvised something close to this: http://jsfiddle.net/KwW5b/4/ (WASD movement). The idea for the movement was to use the mouse map to detect when the player has moved to a different tile and then flip the offsets, and for the most part it works correctly (each corner makes the player move to wrong location: see http://www.youtube.com/watch?v=0xr15IaOhrI, which is probably because I couldn't get the full mouse map work properly), but I have no illusions that it is even close to a good/sane solution. And anyway, it's mostly just to demonstrate what kind of a thing I'd like to implement.

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• Moving from VB.NET to C#

  - by w0051977

  I have worked with the VB.NET programming language for the last five years. I want to move to C# as I believe skills are more valued plus it is more similar to other object oriented languages like Java. I was offered a job today working primarily with C#. I explained at the interview that I am a VB.NET Developer and I did the test in VB.NET (though they would of preferred C#). If I decide to accept the position then I will be starting at at the top end of the salary bracket (only very slightly more than I earn now). I will have to help more junior staff in the future who probably have more experience using C# than I do (1-2 years). I used Java and C++ at university. I want to move towards C# in the future as I believe C# skills are more valued based on job advertisements I have seen recently. Has anyone else done this and did it work? i.e. move to a new organisation as a C# Developer at quite a senior level with experience primarily using VB.NET.

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• Scala - learning by doing

  - by wrecked

  coming from the PHP-framework symfony (with Apache/MySQL) I would like to dive into the Scala programming language. I already followed a few tutorials and had a look at Lift and Play. Java isn't a stranger to me either. However the past showed that it's easiest to learn things by just doing them. Currently we have a little - mostly ajax-driven - application build on symfony at my company. My idea is to just build a little project similar to this one which might gets into production in the future. The app should feature: High scalability and performance a backend-server web-interface and a GUI-client There are plenty of questions arising when I think of this. First of all: Whats the best way to accomplish a easy to maintain, structured base for it? Would it be best to establish a socket based communication between pure-scala server/client and accessing that data via Lift or is building a Lift-app serving as a server and connecting the gui-client (via REST?) the better way? Furthermore I wounder which database to choose. I'm familiar with (My)SQL but feel like a fool beeing confronted with all these things like NoSQL, MongoDB and more. Thanks in advance!

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• Minimizing use of paper

  - by Abody97

  I've recently faced this problem in a dynamic programming curriculum, and I honestly have no idea about how to determine the appropriate state. You're given N (1 <= N <= 70) paragraphs and M (1 <= M <= N) figures. Each paragraph i requires PL_i (1 <= PL_i <= 100) lines and references at most one figure. Each figure is referenced exactly once (i.e., no two paragraphs can reference the same figure, and for each figure there's a paragraph that references it.) Each figure requires PF_i (1 <= PF_i <= 100) lines. The task is to distribute those figures and paragraphs on paper in the order they're given, where one paper fits for L lines at most. No paragraph or figure is too large to fit on one paper. If a paragraph x placed on paper x_p references a figure y then y must be placed on either the paper x_p - 1 or x_p or x_p + 1. We have to find the minimum number of lines (and thus pages) to allocate in order to distribute all the figures and paragraphs. Any help would be extremely appreciated. Thanks in advance!

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• How to match responses from a server with their corresponding requests? [closed]

  - by Deele

  There is a server that responds to requests on a socket. The client has functions to emit requests and functions to handle responses from the server. The problem is that the request sending function and the response handling function are two unrelated functions. Given a server response X, how can I know whether it's a response to request X or some other request Y? I would like to make a construct that would ensure that response X is definitely the answer to request X and also to make a function requestX() that returns response X and not some other response Y. This question is mostly about the general programming approach and not about any specific language construct. Preferably, though, the answer would involve Ruby, TCP sockets, and PHP. My code so far: require 'socket' class TheConnection def initialize(config) @config = config end def send(s) toConsole("--> #{s}") @conn.send "#{s}\n", 0 end def connect() # Connect to the server begin @conn = TCPSocket.open(@config['server'], @config['port']) rescue Interrupt rescue Exception => detail toConsole('Exception: ' + detail.message()) print detail.backtrace.join('\n') retry end end def getSpecificAnswer(input) send "GET #{input}" end def handle_server_input(s) case s.strip when /^Hello. (.*)$/i toConsole "[ Server says hello ]" send "Hello to you too! #{$1}" else toConsole(s) end end def main_loop() while true ready = select([@conn, $stdin], nil, nil, nil) next if !ready for s in ready[0] if s == $stdin then return if $stdin.eof s = $stdin.gets send s elsif s == @conn then return if @conn.eof s = @conn.gets handle_server_input(s) end end end end def toConsole(msg) t = Time.new puts t.strftime("[%H:%M:%S]") + ' ' + msg end end @config = Hash[ 'server'=>'test.server.com', 'port'=>'2020' ] $conn = TheConnection.new(@config) $conn.connect() $conn.getSpecificAnswer('itemsX') begin $conn.main_loop() rescue Interrupt rescue Exception => detail $conn.toConsole('Exception: ' + detail.message()) print detail.backtrace.join('\n') retry end

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• How can I make sure my evening project code is mine?

  - by Sebastian

  I'm a physicist with a CS degree and just started my PhD at a tech company (wanted to do applied research). It deals with large scale finite element simulations. After reviewing their current approach, I think that a radically different method has to be applied (they are using a commercial tool which is very limited). I'd rather base my research on an open source finite element solver and write a program which makes use of it. I'd like to develop this idea in the evenings, because that's the time that best suits me for programming (during the day I prefer reading and maths) and use it at a late stage of my PhD. I'd like to have the option to release my program as open source on my website as a reference, for future personal or even commercial (e.g. consulting) use. How can I make sure that my company doesn't claim the code ownership? I don't really I thought that a version control system could help (check out only in the evening). This would document that I programmed not during regular office hours (documented elsewhere). But these data can be easily manufactured. Any other ideas? I want to stress that I'm not interested in selling software. Jurisdiction is EU, if that matters. Thank you.

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• MySQL Connector/Net 6.6 GA has been released

  - by fernando

  MySQL Connector/Net 6.6, a new version of the all-managed .NET driver for MySQL has been released.  This is the GA intended to introduce users to the new features in the release.  This release is feature complete. It is recommended for use in production environments. It is appropriate for use with MySQL server versions 5.0-5.6 It is now available in source and binary form from http://dev.mysql.com/downloads/connector/net/#downloads and mirror sites (note that not all mirror sites may be up to date at this point-if you can't find this version on some mirror, please try again later or choose another download site.) The 6.6 version of MySQL Connector/Net brings the following new features:   * Stored routine debugging   * Entity Framework 4.3 Code First support   * Pluggable authentication (now third parties can plug new authentications mechanisms into the driver).   * Full Visual Studio 2012 support: everything from Server Explorer to Intellisense&   the Stored Routine debugger. The release is available to download athttp://dev.mysql.com/downloads/connector/net/6.6.html Documentation ------------------------------------- You can view current Connector/Net documentation at http://dev.mysql.com/doc/refman/5.5/en/connector-net.html For specific topics: Stored Routine Debugger:http://dev.mysql.com/doc/refman/5.5/en/connector-net-visual-studio-debugger.html Authentication plugin:http://dev.mysql.com/doc/refman/5.5/en/connector-net-programming-authentication-user-plugin.html You can find our team blog at http://blogs.oracle.com/MySQLOnWindows. You can also post questions on our forums at http://forums.mysql.com/. Enjoy and thanks for the support! 

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• Data structure for grid with negative indeces

  - by The Secret Imbecile

  Sorry if this is an insultingly obvious concept, but it's something I haven't done before and I've been unable to find any material discussing the best way to approach it. I'm wondering what's the best data structure for holding a 2D grid of unknown size. The grid has integer coordinates (x,y), and will have negative indices in both directions. So, what is the best way to hold this grid? I'm programming in c# currently, so I can't have negative array indices. My initial thought was to have class with 4 separate arrays for (+x,+y),(+x,-y),(-x,+y), and (-x,-y). This seems to be a valid way to implement the grid, but it does seem like I'm over-engineering the solution, and array resizing will be a headache. Another idea was to keep track of the center-point of the array and set that as the topological (0,0), however I would have the issue of having to do a shift to every element of the grid when repeatedly adding to the top-left of the grid, which would be similar to grid resizing though in all likelihood more frequent. Thoughts?

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• How many tasks to plan beforehand [closed]

  - by no__seriously

  As for my daily routine. Every morning when I come to work, I look at the items of my todo-list inbox (noted from the previous day). For each task I think about on which day I should get started and then group them accordingly. Once that's finished, I get started with my actual schedule for the day. Now, this pre-planning for each task (which could be concerning user interface to compiler programming) is mostly pretty sketchy. Serious thoughts about design and implementation comes when the task is about to be tackled. This approach works for me and I can't really complain. But I'm wondering. Since I'm personally most productive during the morning, would it make sense to already go into a deeper level of planning right away for each task? Or is that unproductive and would rather confuse than clarify? I think the latter. How do you handle your task management for each task / project and how far do you go with planning before even getting started with that item?

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• Contexts and Dependency Injection(CDI)??

  - by Masa Sasaki

  WebLogic Server?????????????WebLogic Server????????6?20?????????37?WebLogic Server???@????????Contexts and Dependency Injection(CDI)?(?????????? Fusion Middleware?????? ?? ?)?????????????????Java EE 6????????CDI???????DI(Dependency Injection)?Java EE 5????????????????????CDI??DI????????????????????????????????????????????????????????CDI????????????????????(?????? Fusion Middleware?????? ??? ??) CDI?? ???????CDI???Java EE 6???????JSR299: Contexts Dependency Injection????? ?????Dependency Injection (??????)?Aspect-Oriented Programming (AOP)?Interception ??????????????????????????? CDI?????????????????????????????????????????????? ?????????????????????????????????????????? ?????????????????????????????????????????????? ???????????????????????????CDI?????????????? CDI?????????????2? ??1???CDI??????????Oracle WebLogic Server 12c????Java EE 6????????? ?????????????????2???beans.xml???????Web??????????WEB-INF/beans.xml? EJB??META-INF/beans.xml????????????CDI????????????????beans.xml???? ?????????????????????? Java EE 5?DI(Dependency Injection) Java EE 5??DI????????????????????????????????????? ?????????????????????????????????????????(@EJB? @Resource?@WebServiceRef)??? Java EE 6?CDI Java EE 6?CDI?????????????????@Inject???????????????? ???????????????????????????????????????????????????? @Qualifier????????????????? ?????????????????????????????????????????@Qualifier? ????????????·??????????????????????@JPN??????????? @Produce???????? ???????????????????? ????????·?????????????? CDI?????????????????????????????????·??????? ????????????????????????????????????????????? ???????????????? EL(Expression Language) ???????? EL????????????JSF?ManagedBean?????????????·?????????????? ??? Java EE 6?????????CDI???????????Java EE 5?DI????AOP??? ???????????????????DI, AOP???????????????? ?????????????CDI?????????????????????????????? ?????CDI?????????????????????????????????? ?????? WebLogic Server??? WebLogic Server?????????WebLogic Server?????! WebLogic Server??????(???????????) WebLogic Server???????? WebLogic Server??????

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• The model to sell apps on App Store is better with a paid only version?

  - by ????

  Rob Napier, the author of iOS 5 Programming Pushing the Limits, mentioned there are several models of selling apps on the App Store: Write an app and sell it Publish a free and a full version Ad supported by third party or by iAd In App purchase Surprisingly, the author said that the most workable model is (1) in terms of sales. I would think that (2) with fairly limiting ability for the free version can bring more sales, as people without trying, might not plunge down $0.99 or $1.99 for something they haven't tried? I for one, might not have purchased Angry Birds if I didn't try their free version first. Also, I think it also depends on the situation: if the app is about alarm clock, and there are already 5 alarm clocks in App Store that are free, then your app that is $0.99 might not be that eagerly purchased. If yours is also free, and users really like it out of all the other ones, then they may think, $0.99 is nothing to get a good alarm clock, and gladly pay you the $0.99 in exchange for a full version of the alarm clock, something that they can't get with the free version. (such as the full version can let you choose a song from your Music Library for the alarm). Could (1) work only if the user definitely want it and have no substitute? How might it work the best?

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• Windows Server or Linux for final project

  - by user1433490

  A few weeks ago I came up with an idea to develop a mobile app which will direct students in my university to the nearest printer availiable. The whole thing is part of my final project. The Android based app will need to perform the following tasks: The user's location in the campus is sent to the server. Assume this part works just fine. The server sends an SNMP request to the printers in the user's vicinity. I'll probably use PHP or Python for that part. The data requested by SNMP is processed and sent back to the client My question concerns the server. The university's IT manager offered me a designated server for development, which sounds great. Now I need to choose which OS I want installed on the server - Windows server or Linux (don't know which versions). I don't have any server programming/operating experince, but generally speaking I feel more comfortable in Windows enviroment (just because that has always been my OS). I don't have much time for learning a new OS, but when does it make sense generally to host or develop server side applications on a Windows environment versus a Linux environment?

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• Reliance on the compiler

  - by koan

  I've been programming in C and C++ for some time, although I would say I'm far from being expert. For some time I've been using various strategies to develop my code such as unit tests, test driven design, code reviews and so on. When I wrote my first programs in BASIC I typed in long listings before finding they would not run and they were a nightmare to debug. So I learnt to write a small bit and then test it. These days I often find myself repeatedly writing a small bit of code then using the compiler to find all the mistakes. That's OK if it picks up a typo but when you start adjusting the parameters types etc just to make it compile you can screw up the design. It also seems that the compiler is creeping into the design process when it should only be used for checking syntax. There's a danger here of over reliance on the compiler to make my programs better. Are there better strategies than this ? I vaguely remember some time ago an article on a company developing a type of C compiler where an extra header file also specified the prototypes. The idea was that inconsistencies in the API definition would be easier to catch if you had to define it twice in different ways.

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• Internal Libraries (Subversion Externals, 'library' branch, or just another folder)

  - by Ntsc

  Currently working on multiple projects that need to share internal libraries. The internal libraries are updated continually. Currently only 1 project needs to be stable but soon we will need to have both projects stable at any given time. What is the best way to SVN internal libraries? Currently we are using the 'just another folder' like so... trunk\project1 trunk\project2 trunk\libs It causes a major headache when a shared library is updated for project1 and project2 is now dead until the parts that use the library are updated. So after doing some research on SVN externals I thought of this... trunk\project1\libs (external to trunk\libs @ some revision) trunk\project2\libs (external to trunk\libs @ different revision) trunk\libs\ I'm a little worried about how externals work with commits and not making library commits so complicated that I am the only one capable of doing it (mostly worried about branches with externals as we use them extensively). On top of that we have multiple programming languages within each project some of which don't support per-project library directories (at least not easily) so we would need to check out on a per project basis instead of checking out the trunk. There is also the 'vendor' style branching of libraries but it has the same problem as above where the library would have to be a sub folder of each project and is maybe a little to complicated for how little projects we have. Any insight would be nice. I've spent quite a bit of time reading the Subversion book and feeling like I'm getting no where.

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• Looking for some advice on the next steps to take [closed]

  - by mopsyd

  I am looking for some advice on the next step to take in development of my programming skills. I was directed here when asking this question on Stack Overflow. What I know already Have a solid grasp of xhtml, xml, php, javascript, MySQL, actionscript. Have a working knowledge of vb, and have a slight grasp of java from tinkering with a minecraft server. Some brief exposure to the Unreal Engine in college. Some skills with sql server, ms sql, office integration, etc. Also some knowledge of Asterix and PBX/VOIP. Been coding off and on since the age of 8 but I have no computer science education aside from what I have taught myself or learned from work/freelance. I work in OSX mostly, but can use/troubleshoot windows and ubuntu fluently also. Decent with both UNIX and DOS CLI. What I'm considering I'm looking to learn a scripting language to build web apps, help streamline my home server that I am building and run shell scripts. Being able to help code games later is a big plus. My Question Between java, ruby, perl, and python, which would be the best investment of my time considering what I already know and what direction I would like to take my skillset? What are good resources for your suggested direction? Thanks in advance.

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• Good quality Secure Software Development Training [closed]

  - by Patrick

  Just had my annual appraisal and found out my company is willing to pay for training and exams etc! Woohoo (they kept that one quiet). I'm interested in doing a course on secure development techniques. Has anyone got any suggestions for good quality distance learning courses in secure development (I could probably get a couple of days off to attend a conference/ course if required)? We're mostly an MS .Net house but I have no particular allegiance to MS or any other programming language (though, obviously, C++ is the best language in the world). I have 12 years development experience working in (what are now) PCI:DSS environments, including designing and developing a key management system and I have some knowledge of basic attacks (XSS, injection etc). I would prefer a hard course I struggle with to a basic course I learn 3 things from (but hopefully get something right at my level). A quick google found these two course which look good: http://www.sans.org/course/secure-coding-net-developing-defensible-applications https://www.isc2.org/csslpedu/default.aspx I don't really know how to choose between them, and finding other courses isn't going to make that job any easier, so I thought I'd ask those who know. EDIT : Hmm, care to share the reason for your down vote, will help me learn how to use the site better...

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• What kind of projects are suited as a portfolio? [on hold]

  - by Asyx

  I was thinking about finishing up some hobby projects I used myself or am planing to use myself but I'm not sure if a future employer might be put off by them. For example, if I decided to create a custom website for an online (gaming, maybe) community instead of using an existing CMS, is it a good idea to provide a link to said community website or should I just put up the CMS and pretend like nobody actually uses it? Also, what about very specific things? I like linguistics and constructing languages. Obviously nobody wants to come up with 1000s of words so people usually use word generators or software to emulate sound shift or software to organise everything and produce dictionaries and such. Would such a project be too specific and too abstract for a portfolio or is the "he did programming work simply for enjoyment and his hobby and not just for money or grades" thing more important? It's quite an abstract hobby and most people don't even know that it's a thing and think the languages you hear in Game of Thrones, Avatar or Star Trek are just gibberish. Explaining such things to people is a pain to begin with especially if said people speak no other language. Would such things throw an employer off or is the content itself completely irrelevant? Thanks. Also, if this is not fitting for the programmers stackexchange, then please, don't close the thread right away but tell me where else to go because I got here though a closed question from stackoverflow. Thanks.

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• I've failed at PHP several times. Is Ruby the Cure? [closed]

  - by saltcod

  Extremely, extremely subjective question here, but its something I've been struggling with for quite a while. I've seriously tried to become a reasonable PHP coder for the past several years. But I've really failed every time. I hate to describe myself as a beginner, b/c I've been designing websites (using WordPress, Drupal, etc) for years, but still I just can't seem get better at programming. Could it be that I have some kind of allergy to PHP? I went through Chris Pine's awesome into to Ruby about a week ago (for about the fifth time), and though it did all all seem much clearer to me than PHP, I wondered if I was just switching languages to find an easy way out? The things I struggle with in PHP all seem elementary—when to use a function, how to return database queries in foreach/while statements, when to turn those queries into reusable functions, adding arguments to functions, etc, etc. And all the OOP stuff that I keep seeing these days just files over my head. I guess my question(s) are: Am I going about learning how to program in the wrong way? Do I have some aversion to PHP that's preventing me from catch on? If I keep pushing at Ruby/Rails, will it just eventually 'click'. Or, the one I fear, am I just unlikely to ever be a programmer? Honesty appreciated. Terry

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• When and how does one become a good programmer these days? [closed]

  - by YoungMoney

  I mean, good enough to make software people want and get paid for it. Maybe even good enough to launch a company or something. I'm also concerned that I'm not applying the finer points of my algorithms/data structures/software design knowledge. Background: I'm 20 and have been struggling with programming for about two years now, trying to become a software engineer. I started with a few university courses that I did quite poorly in. I learned how to make websites with HTML/JavaScript and PHP/MySQL, but feel like I know very relevant theory for making good databases - how does something like Facebook serve hundreds of millions of people? What would be smart ways to store data? I don't know. Now I'm doing some android application development, but again I have no idea about good Java design theory (I use static variables like they're going out of fashion) and feel more like I'm gluing stuff together and letting Eclipse slowly autocomplete my project. In short, I'm not sure if I'm becoming a legitimate software developer or just "doing what's cool". At least I've taken some data structures and Algorithms courses and plan to take more in the next years. But I'm having a really tough time applying this stuff to my fun little apps that I'm building. Every language higher level than C++ seems to have its own quicksort function already built-in, for example. Similarly, I can't remember ever needing to implement a linked-list, heap, binary tree, or or worry about pointers and memory management. But maybe this is a good thing so that I focus on other things? I'm not too sure what those other things are though. Hopefully something more than building another photo sharing app. Anyways that's it for me, I look forward to your responses!

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• Separate update and render

  - by NSAddict

  I'm programming a simple Snake in Java. I'm a complete newbie when it comes to Java and Game Developing, so please bear with me ;) Until now, I have been using a UI thread, as well as a update-thread. The update thread just set the position, set the GameObjects, and so on. I didn't think much of concurrency, but now I've come to a problem. I wanted to modify the ArrayList<GameObject>, but it throws a java.util.ConcurrentModificationException. With a little research I found out that this happens because the two threads are trying to access the variables at the same time. But I didn't really find a way to prevent this. I thought about copying the array and swapping them out when the rendering is finished, but I would have to deep-copy them, which isn't really the best solution in my opinion. It probably eats up more CPU resources than a single-threaded game. Are there any other ways to prevent this? Thanks a lot for your help!

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• Arguments? Path filing wrong? [on hold]

  - by user3034947

  I'm working through the Java SE 7 programming activity and I'm having trouble sort of understanding how arguments work. Here's the code: public class CopyFileTree implements FileVisitor<Path> { private Path source; private Path target; public CopyFileTree(Path source, Path target) { this.source = source; this.target = target; } @Override public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) { // Your code goes here Path newdir = target.resolve(source.relativize(dir)); try { Files.copy(dir, newdir); } catch (FileAlreadyExistsException x) { // ignore } catch (IOException x) { System.err.format("Unable to create: %s: %s%n", newdir, x); return SKIP_SUBTREE; } return CONTINUE; } @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs ) { // Your code goes here Path newdir = target.resolve(source.relativize(file)); try { Files.copy(file, newdir, REPLACE_EXISTING); } catch (IOException x) { System.err.format("Unable to copy: %s: %s%n", source, x); } return CONTINUE; } @Override public FileVisitResult postVisitDirectory(Path dir, IOException exc ) { return CONTINUE; } @Override public FileVisitResult visitFileFailed(Path file, IOException exc ) { if (exc instanceof FileSystemLoopException) { System.err.println("cycle detected: " + file); } else { System.err.format("Unable to copy: %s: %s%n", file, exc); } return CONTINUE; } } It says to test this I need to enter arguments in properties of the project which I did? Can someone clarity what I'm doing wrong?

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