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• Any way to force classes to have public static final field in Java?

  - by serg555

  Is there a way to force classes in Java to have public static final field (through interface or abstract class)? Or at least just a public field? I need to make sure somehow that a group of classes have public static final String TYPE = "..."; in them.

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• Java generics - getting the type..

  - by peter

  Hi! I'm a c# guy giving Java a try .. so how would I do the following in java. in C# public T create_an_instance_of<T>(){ T instance = default (T); // here's usually some factory to create the implementation instance = some_factory.build<T>(); // or even.. instance = some_factory.build(typeOf(T) ); return instance; }

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• What is the difference between a protocol and a interface?

  - by user333639

  I am confused about what the difference is between a protocol and an interface? They both seem to be doing the same thing? Is it like abstract in C# in that you are required to implement it?

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• how to handle redirect from http response in c# code ?

  - by dotnetcoder

  I have a http request call that return a url . If I run this url in IE it returns a page that redirects to a another page and downloads the excel file. How can I abstract this whole process in a c# Api tha will deal with http request + response + redirect + file_downlaod in a method and evetually return the file or the file stream. thanks for the help.

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• When would I want to model a class with a private ctor?

  - by dotnetdev

  Hi, I've seen plenty of classes in .NET which have private constructor (Stream is one of them I think). When would I want to model a class like this? I keep thinking that if my class has no internal state/fields, then I can make it have a private constructor. Am I on the right track with this idea? I can understand the use of a factory (I've run into the tipping point a few times), but not with a private constructor class. Thanks

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• Does [Serializable] work for inherited classes?

  - by MattiasK

  I haven't worked much with remoting so excuse this rather rudimentary question, If I derive a class from an abstract class marked as [Serializable] (for passing the data across an appdomain), does the other side get the actual overriden implementation? ie does polymorphism work over remoting/Serializable? I need to create a clone on the other side rather than operating on the original so MarshalByRef is not an option...

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• What to name a structure contains hash table and vectors?

  - by datasunny

  Here is an easy question: I have a struct which contains two hash tables and one vector. Im looking for a generic name for this kind of structure. Any suggestions? say factory?

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• What Design Pattern is this?

  - by 01

  I know that everything we do in programming can be described as design pattern(even abstract method has design pattern called template method) public class Guicer extends AbstractModule { private static Injector injector = Guice.createInjector(new Guicer()); public static void setInjector(Injector injector) { Guicer.injector = injector; } public static T getInstance(Class c) { return injector.getInstance(c); } @Override protected void configure() { } } What design patterns are used in this code?

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• Samples of Scala and Java code where Scala code looks simpler/has less lines?

  - by Roman

  I need some code samples (and I also really curious about them) of Scala and Java code which show that Scala code is more simple and concise then code written in Java (of course both samples should solve the same problem). If there is only Scala sample with comment like "this is abstract factory in Scala, in Java it will look much more cumbersome" then this is also acceptable. Thanks!

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• How to implement table-per-concrete-type using entity framework

  - by SDReyes

  Hello Guys! I'm mapping a set of tables that share a common set of fields: So as you can see I'm using a table-per-concrete-type strategy to map the inheritance. But... I have not could to relate them to an abstract type containing these common properties. It's possible to do it using EF? BONUS: The only non documented Entity Data Model Mapping Scenario is Table-per-concrete-type inheritance http://msdn.microsoft.com/en-us/library/cc716779.aspx : P

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• Use Enum or #define ?

  - by sub

  I'm building a toy interpreter and I have implemented a token class which holds the token type and value. The token type is usually an integer, but how should I abstract the int's? What would be the better idea: // #defines #define T_NEWLINE 1; #define T_STRING 2; #define T_BLAH 3; /** * Or... */ // enum enum TokenTypes { t_newline, t_string, t_blah };

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• Mysql date : 0000-00-00 00:00:00

  - by jasmine

  In my query: $cselect = mysql_real_escape_string($_POST['cselect']); --------------- --------------- $sql = sprintf("INSERT INTO content (id, catID, title, abstract, body, status, published, date, description_meta, keywords_meta) VALUES ('', '%s', '%s','%s','%s','%s','%s','%s','', '' )", $cselect,$chead, $cabst,$ctext, $cp, $cradio, 'TIMESTAMP: Auto NOW()'); ouptput for date is: 0000-00-00 00:00:00. What is wrong in my query? Thanks in advance

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• How to get all links avaliable from server on some port?

  - by Ole Jak

  So I have lots of links like address:port/Bla-bla/bla-bla/file/blabla234times/ created by some server (like VLC) how can I get all links (list of them) avaliable from server (abstract server working on windows) from my C# programm?

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• Centralizing / Abstracting MSSQL Data from Multiple Tables / Databases

  - by davemackey

  If one has a number of databases (due to separate application front-ends) that provide a complete picture - for example a CRM, accounting, and product database - what methods are available to centralize/abstract this data for easy reporting? Essentially, I'm wondering if there is a way to automatically pull data from multiple databases into a central repository that is continuously updated from the three databases and which can be used for reporting? I'm also open to alternative best practice suggestions?

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• Do Java or C++ lack any OO features?

  - by tsv

  I am interested in understanding object-oriented programming in a more academic and abstract way than I currently do, and want to know if there are any object-oriented concepts Java and C++ fail to implement. I realise neither of the languages are "pure" OO, but I am interested in what (if anything) they lack, not what they have extra.

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• How to organise input for many classes

  - by Evl-ntnt

  I have one abstract class and many child classes. In child classes are from 2 to 20 members which must be filled by user. What the best way to do this using OOP? Make form for each child class? Or hide and unhide many input elements and labels? Is there some best way? I using WPF and C#

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• How do I restrict the creation of an anonymous subclass (Java)

  - by Ad

  Hi I have an abstract class A in a package P with subclasses B and C. I don't want it to be possible to create an anonymous subclass to the class A from outside the package P.

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• how to use JSF 1.2 and JPA in Netbeans ?

  - by user364746

  Hello... I'm trying to use JPA to connect my JSF components to database but the problem is that I can't figure out how to get this all combination works.I have done entity classes from database, also create persistence.xml file and now I don't know where to go!! I don't know how to use entity manager and entity manager factory. Is there any tutorial helps me how to use Java EE 5,JSF 1.2 and JPA in netbeans? any help appreciated Thanks

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• Question about how-to implement an interface

  - by davit-datuashvili

  I have the following interface: public interface MyFunctor { int myFunction(int x); } And I created a class which implements this interface : public class Myfunction1 implements MyFunctor { } But it show me the error : implement all abstract method Please help me.

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• c++ : looking away to implemnt this senario

  - by user63898

  Hi im looking to find how to implement this scenario: i have logic code that is inside function, now i like to be able to execute this function in a separate thread. now what i have is a raw implementation of this .. i simple Init the Thread that in its Start/Run method i keep the function logic . how can i make it more generic ? so i could send the function ( mybe function pointer ) to generic thread factory/pool ? in c++

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• how do i use @var on a function variable?

  - by fayer

  i've got a variable $user that is of data type User (a class). i've got it in a class method so i can't just type: /** * @var User */ $user = Factory::getInstance('User'); because that will work only with class properties, not method variables like in this case. how could i tell netbeans that that variable is of data type User in a method? Thanks!

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• How to get Type[] of all classes a class extends

  - by Jeff Dahmer

  You can do Type[] interfaces = typeof(MyClass).GetInterfaces(); to get a list of everything a class implements implements. I am wondering if there is anyway to crawl the "extends" tree to see all the base types a class inherits, i.e. abstract classes etc.?

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• What does it mean to flush a socket?

  - by User4748402

  I don't really know much about sockets except how to read and write to them as if they were files. I know a little about using socket selectors. I don't get why you have to flush a socket, what's actually happening there? The bits just hang out somewhere in memory until they get pushed off? I read some things online about sockets, but it's all very abstract and high level. What's actually happening here?

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• C++: Enum or #define

  - by sub

  I'm building a toy interpreter and I have implemented a token class which holds the token type and value. The token type is usually an integer, but how should I abstract the int's? What would be the better idea: // #defines #define T_NEWLINE 1; #define T_STRING 2; #define T_BLAH 3; /** * Or... */ // enum enum TokenTypes { t_newline, t_string, t_blah };

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• Getting type from class name with Java generics

  - by newbie

  I have following Class, I need to get type in constructor, how can I do that? public abstract class MyClass<T> { public MyClass() { // I need T type here ... } }

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