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• I like to learn computer science and programming, but i have no understanding.

  - by Josiah

  Hi all, I like to learn computer science and programming, but i don't know where and how to start. For the past two months, i have been researching on types of programming, i found my interest in desktop programming, and also found this subjects (discrete maths, logic, algorithms, data structures, artificial intelligence, simulation) said to be a most known (subjects). Well as a beginner, i have no understanding on what type of language or books that can cover all these subjects, or even how to write any code. Secondly, am as young as you can guess and i need a language to start with that will be easy for me to understand, and books to read. Thank you.

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• How do I structure a GWT project?

  - by smaye81

  Hello, I have followed the basic GWT tutorial for creating a project in Eclipse. Now, I am trying to build off what I learned in the tutorial. I created a static utility class to perform some database connection logic. However, when I try to compile I get: [ERROR] Line 46: No source code is available for type com.sample.server.ConnectionUtil; did you forget to inherit a required module? Where can I put simple classes that I've created on my own? Do they have to be outside the package structure of the basic module, 'com.sample'? Or do I have to specify a whole new module in the gwt.xml file and inherit from that? There has to be something simple I'm missing.

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• Which syntax is better for return value?

  - by Omar Kooheji

  I've been doing a massive code review and one pattern I notice all over the place is this: public bool MethodName() { bool returnValue = false; if (expression) { // do something returnValue = MethodCall(); } else { // do something else returnValue = Expression; } return returnValue; } This is not how I would have done this I would have just returned the value when I knew what it was. which of these two patterns is more correct? I stress that the logic always seems to be structured such that the return value is assigned in one plave only and no code is executed after it's assigned.

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• Why isn't multi-touch working for my imagebuttons?

  - by Droidy

  I'm using imagebuttons that play sounds using SoundPool. Here is example code of one of the imagebuttons: ImageButton Button1 = (ImageButton)findViewById(R.id.sound); Button1.setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN ) { mSoundManager.playSound(1); return false; } return false; } }); For some reason, it doesn't allow you to click multiple buttons at the same time. Is it because I'm building for 1.6 SDK? Thanks!

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• IOC - Should util classes with static helper methods be wired up with IOC?

  - by Greg

  Hi, Just trying to still get my head around IOC principles. Q1: Static Methods - Should util classes with static helper methods be wired up with IOC? For example if I have a HttpUtils class with a number of static methods, should I be trying to pass it to other business logic classes via IOC? Follow on questions for this might be: Q2: Singletons - What about things like logging where you may typically get access to it via a Logger.getInstance() type call. Would you normally leave this as is, and NOT use IOC for injecting the logger into business classes that need it? Q3: Static Classes - I haven't really used this concept, but are there any guidelines for how you'd typically handle this if you were moving to an IOC based approach. Thanks in advance.

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• PDO update query with conditional?

  - by dmontain

  I have a PDO mysql that updates 3 fields. $update = $mypdo->prepare("UPDATE tablename SET field1=:field1, field2=:field2, field3=:field3 WHERE key=:key"); But I want field3 to be updated only when $update3 = true; (meaning that the update of field3 is controlled by a conditional statement) Is this possible to accomplish with a single query? I could do it with 2 queries where I update field1 and field2 then check the boolean and update field3 if needed in a separate query. //run this query to update only fields 1 and 2 $update_part1 = $mypdo->prepare("UPDATE tablename SET field1=:field1, field2=:field2 WHERE key=:key"); //if field3 should be update, run a separate query to update it separately if ($update3){ $update_part2 = $mypdo->prepare("UPDATE tablename SET field3=:field3 WHERE key=:key"); } But hopefully there is a way to accomplish this in 1 query?

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• PHP Comparing 2 Arrays For Existence of Value in Each

  - by Dr. DOT

  I have 2 arrays. I simply want to know if one of the values in array 1 is present in array 2. Nothing more than returning a boolean true or false Example A: $a = array('able','baker','charlie'); $b = array('zebra','yeti','xantis'); Expected result = false Example B: $a = array('able','baker','charlie'); $b = array('zebra','yeti','able','xantis'); Expected result = true So, would it be best to use array_diff() or array_search() or some other simple PHP function? Thanks!

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• how to implement double click in android

  - by Sanal Varghese

  I am doing a project in which i want to display a particular message on single touch and another message on double touch using android.How can i implement it. My sample code is below if(firstTap){ thisTime = SystemClock.u`enter code here`ptimeMillis(); firstTap = false; }else{ prevTime = thisTime; thisTime = SystemClock.uptimeMillis(); //Check that thisTime is greater than prevTime //just incase system clock reset to zero if(thisTime > prevTime){ //Check if times are within our max delay if((thisTime - prevTime) <= DOUBLE_CLICK_MAX_DELAY){ //We have detected a double tap! Toast.makeText(AddLocation.this, "DOUBLE TAP DETECTED!!!", Toast.LENGTH_LONG).show(); //PUT YOUR LOGIC HERE!!!! }else{ //Otherwise Reset firstTap firstTap = true; } }else{ firstTap = true; } } return false;

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• Is enemy / bot A.I. part of the model or controller in an MVC game

  - by Iain

  It could be part of the model because it's part of the business logic of the game. It could be part of the controller because it could be seen as simulating player input, which would be considered part of the controller, right? Or would it? What about a normal enemy, like a goomba in Mario? UPDATE: Wow, that's really not the answer I was expecting. As far as I could tell, A.I. is an internal part of the autonomous game system, hence model. I'm still not convinced.

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• Call an IOUSBDeviceInterface function on an obj-c object instead of a C structure

  - by b1onic

  Let's say I want to close an USB device. Here is a C structure representing the USB device: struct __USBDevice { uint16_t idProduct; io_service_t usbService; IOUSBDeviceInterface **deviceHandle; IOUSBInterfaceInterface **interfaceHandle; Boolean open; }; typedef struct __USBDevice *USBDeviceRef; Here is the code to close the device: // device is a USBDeviceRef structure // USBDeviceClose is a function member of IOUSBDeviceInterface C Pseudoclass (*device->deviceHandle)->USBDeviceClose(device->deviceHandle); Now imagine that the device properties are declared in an obj-c class @interface Device : NSObject { NSNumber idProduct io_service_t usbService; IOUSBDeviceInterface **deviceHandle; IOUSBInterfaceInterface **interfaceHandle; BOOL open; } @end How would I do to call USBDeviceClose() ?

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• How can I pipe a large amount of data as a runtime argument?

  - by Zombies

  Running an executable JAR on a linux platform here. The program it self works on a somewhat large amount of data, basically a list of URLs... could be up to 2k. Currently I get this from a simple DB call. But I was thinking that instead of creating a new mode and writing SQL to get a new result set and having to redploy everytime, I could just make the program more robust by passing in the result set (the list of URLs) that need to be worked on... so, within a linux environment, is there a pain-free/simple way to get the result set and pass it in dynamically? I know file i/o is one, but it doesn't seem to be effecient because each file has to be named, as well more logic to handle grabbing the correct file, creating a file with a unique name, etc.

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• How do you find the balance between Javascript (jQuery) and code behind in ASP.NET.

  - by PieterG

  Stackoverflow members, How do you currently find the balance between javascript and code behind. I have recently come across some extremely bad (in my eyes) legacy code that lends itself to chaos (someHugeJavafile.js) which contains a lot of the logic used in many of the pages. Let's say for example that you have a Form that you need to complete. 1. Personal Details 2. Address Information 3. Little bit more about yourself You don't want to overload the person with all the fields at once, so you decide to split it up into steps. Do you create separate pages for Personal Details, Address Information and a Little bit more about yourself. Do you create controls for each and hide and show them on a postback or using some update panel? Do you use jQuery and do some checking to ensure that the person has completed the required fields for the step and show the new "section" by using .show()? How do you usually find the balance?

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• How would you start automating my job? - Part 2

  - by Jurily

  (Followup to this question) After surviving the first wave of incoming shipments (9 hours of copy/paste), I now believe I have all the requirements. Here is the updated workflow: Monkey collects email attachments (4 Excel spreadsheets, 1 PDF) Monkey creates central database, does complex calculations (right now this is also an Excel spreadsheet) Monkey sends data to two bosses, who set the retail prices independently; first one to reply wins Monkey sends order form to our other warehouses, also Excel Monkey sends spreadsheets to VIP customers, carefully sanitized and formatted (4 different discount categories) Jurily enters the data into the accounting system. I've given up on automating this part, there's too much business logic involved, and the database is a pile of sh^W legacy My question: What technologies would you use for a quick and dirty solution? I'm mostly sold on C#, but coming from a Linux/C++ background, I'm horribly confused about my choices in Microsoft-land. For bonus points: How would you redesign the whole system from the ground up? P.S. in case you were wondering, my job title is System Administrator.

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• Recommend an algorithms exercise book?

  - by Parappa

  I have a little book called Problems on Algorithms by Ian Parberry which is chock full of exercises related to the study of algorithms. Can anybody recommend similar books? What I am not looking for are recommendations of good books related to algorithms or the theory of computation. Introduction to Algorithms is a good one, and of course there's the Knuth stuff. Ideally I want to know of any books that are light on instructional material and heavy on sample problems. In a nutshell, exercise books. Preferably dedicated to algorithms rather than general logic or other math problems. By the way, the Parberry book does not seem to be in print, but it is available as a PDF dowload.

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• Findbugs warning: Equals method should not assume anything about the type of its argument

  - by Uri

  When running FindBugs on my project, I got a few instances of the error described above. Namely, my overriding versions of equals cast the RHS object into the same type as the object in which the overriding version is defined. However, I'm not sure whether a better design is possible, since AFAIK Java does not allow variance in method parameters, so it is not possible to define any other type for the equals parameter. Am I doing something very wrong, or is FindBugs too eager? A different way to phrase this question is: what is the correct behavior if the object passed to equals is not the same type as an LHS: Is this a false, or should there be an exception? For example: public boolean equals(Object rhs) { MyType rhsMyType = (MyType)rhs; // Should throw exception if(this.field1().equals(rhsMyType.field1())... // Or whatever }

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• ShellExecute not working from IDE but works otherwise.

  - by Altar

  I want to create and then open a txt file using the ShellExecute command. I have used this code for years with Delphi 7 and it worked: function Executa(CONST ExeName, Parameters: string): Boolean; begin if Parameters= '' then Result:= ShellExecute(0, 'open', PChar(ExeName), NIL , nil, SW_SHOWNORMAL)> 32 else Result:= ShellExecute(0, 'open', PChar(ExeName), PChar(Parameters), nil, SW_SHOWNORMAL)> 32; end; Now, I switch to Windows 7 (don't like it; they stuck it on my throat with my new laptop) 64 bit and the code is not working anymore when it runs from IDE. Delhi shows the CPU window with the caption "CPU-Process unknown (2352)". I close the CU windows and everything works fine until I close the application, when Delphi shows the CPU window one more time. If I run the app from outside IDE, it works fine. Looks like the debugger has something to say to me, but I don't know what.

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• Hosting WCF on IIS5/6

  - by Pinu

  I have developed a Web service using WCF Service Application. This service application is a part of multiple projects. we have data access , services(business logic) , testing(to test class) and WCF Service application.Where WCF Service application is just like an infterface and all the request are sent to the services project. so all the projects communicate with each other. I am new to hosting WCF application. Now to host this on IIS do i have to put the whole project in the IIS virtual directory?

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• Dealing w/ Sqlite Join results in a cursor

  - by Bill

  I have a one-many relationship in my local Sqlite db. Pretty basic stuff. When I do my left outer join I get back results that look like this: the resulting cursor has multiple rows that look like this: A1.id | A1.column1 | A1.column2 | B1.a_id_fk | B1.column1 | B1.column2 A1.id | A1.column1 | A1.column2 | B2.a_id_fk | B2.column1 | B2.column2 and so on... Is there a standard practice or method of dealing with results like this ? Clearly there is only A1, but it has many B-n relationships. I am coming close to using multiple queries instead of the "relational db way". Hopefully I am just not aware of the better way to do things. I intend to expose this query via a content provider and I would hate for all of the consumers to have to write the same aggregation logic.

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• displaying current minute of a soccer match

  - by zurna

  I could not figure out the logic I would need to display a current minute of a soccer match. I have three fields in the database. DateFirstStarted DateSecondStarted DateFullEnded I should enter DateFirstStarted when the game starts and on the website. i.e. game starts at 7:05pm, on 7:25pm it should display '20 on the website. However, it should stop on the 45th minute. Then, I enter DateSecondStarted when the second half starts and should count from 46 to 90 and freeze there. Do I make sense? How can I do it? Is there a better way to do this?

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• Jquery checkbox issue with IE6

  - by kumar

  this code works fine in Firefox but not in IE6.. i made changes using boolean true, false but still.. $('#PbtnSelectAll').click(function() { $('#PricingEditExceptions input[type=checkbox]').attr('checked', 'checked'); $('#PbtnSubmit').show(); $('#PbtnCancel').show(); $('fieldset').find("input:not(:checkbox),select,textarea").attr('disabled',true); $('#genericfieldset').find("input,select,textarea").removeAttr('disabled'); }); the problem is i am having the view with Fieldsets.. each fieldset having the checkbox when i click onselect all buton its should select all the fieldset checkboxes..but its not doing its allwasy doing for first fieldset which is closest....other things are igonring but its working in firefox.. thanks

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• Class Methods Inheritence

  - by Roman A. Taycher

  I was told that static methods in java didn't have Inheritance but when I try the following test package test1; public class Main { /** * @param args the command line arguments */ public static void main(String[] args) { TB.ttt(); TB.ttt2(); } } package test1; public class TA { static public Boolean ttt() { System.out.println("TestInheritenceA"); return true; } static public String test ="ClassA"; } package test1; public class TB extends TA{ static public void ttt2(){ System.out.println(test); } } it printed : TestInheritenceA ClassA so do java static methods (and fields have) inheritance (if you try to call a class method does it go down the inheritance chai looking for class methods). Was this ever not the case,are there any inheritance OO languages that are messed up like that for class methods?

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• How to build an easy Rails authentication with OpenID and OAuth1.0a-2.0?

  - by Andrei

  Hi, I'am looking for an easy authentication for my users mostly via facebook, but keeping OpenID and other OAuth alternatives as well. For the case if something will go very bad, I will ask my users to optionally provide their email address, which should be obtained via OpenID or OAuth if possible. The same thing is about their name. I am a newbie in Rails, so I started with Railscasts.com #160 (authlogic) and #170 (authlogic and OpenID), however, I had some problems trying to sign in with my Google Account. As I understand, it will take some effort to adjust #170 for my objectives. On the other hand, there is gem authlogic_rpx which will possibly provide me the needed functionality (see http://rails-authlogic-rpx-sample.heroku.com/signin). What would you do? Is it reasonable to put one more step (RPX) in the authentication logic?

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• Android; Confused by views?

  - by javano

  I have created a class (InputControl) which extends the view of my main class (Main), and takes focus of the screen. I have a button on the main xml layout which calls control() and sets up my InputControl view, from there I capture user input. How can I return back to the xml layout from the InputControl view class? public class Main extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); InputControl = new InputControl(this); } //......SNIP! public void control(){ setContentView(InputControl); InputControl.requestFocus(); } } public class InputControl extends View implements OnTouchListener { public InputControl(Context context) { super(context); setFocusable(true); setFocusableInTouchMode(true); this.setOnTouchListener(this); } public boolean onTouch(View view, MotionEvent event) { //...I AM CAPTURING USER TOUCH EVENTS HERE } }

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• Mongodb using db.help() on a particular db command

  - by user1325696

  When I type db.help() It returns DB methods: db.addUser(username, password[, readOnly=false]) db.auth(username, password) ... ... db.printShardingStatus() ... ... db.fsyncLock() flush data to disk and lock server for backups db.fsyncUnock() unlocks server following a db.fsyncLock() I'd like to find out how to get more detailed help for the particular command. The problem was with the printShardingStatus as it returned "too many chunks to print, use verbose if you want to print" mongos> db.printShardingStatus() --- Sharding Status --- sharding version: { "_id" : 1, "version" : 3 } shards: { "_id" : "shard0000", "host" : "localhost:10001" } { "_id" : "shard0001", "host" : "localhost:10002" } databases: { "_id" : "admin", "partitioned" : false, "primary" : "config" } { "_id" : "dbTest", "partitioned" : true, "primary" : "shard0000" } dbTest.things chunks: shard0001 12 shard0000 19 too many chunks to print, use verbose if you want to for ce print I found that for that particular command I can specify boolean parameter db.printShardingStatus(true) which wasn't shown using db.help().

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• KeyCode_Enter to next edittext

  - by soclose

  Hi, In edittext, after typing 'Enter' key, system make a new line inside it. I'd like to focus on next edittext, no new line. how to code? my code in xml is below <EditText android:id="@+id/txtNPCode" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="18sp" android:layout_alignLeft="@+id/lblNPCode" android:layout_below="@+id/lblNPCode" android:layout_centerHorizontal="true" /> <EditText android:id="@+id/txtCNPCode" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="18sp" android:layout_alignLeft="@+id/lblCNPCode" android:layout_below="@+id/lblCNPCode" android:layout_centerHorizontal="true" /> I also caputer key code in setOnKeyListener tCNPCode.setOnKeyListener(new OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { // TODO Auto-generated method stub if(keyCode == 66) { Toast.makeText(S_PCode.this, "Enter Key", Toast.LENGTH_LONG).show(); //tNPCode.setFocusable(true); } return false; } });

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