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• Why do I have to pay for something that I'm not using?

  - by Knowing me knowing you

  Guys just finished reading one of my college books about threads in Java and I was informed that lock - what ever it is, is in Object class. So it looks like even though I'm not using threaded classes my objects will be heavier because of that? Don't you think that it's a bit annoying and unfair to expect from anyone to pay for something s/he have not intention of using? Thanks

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• Does resharper add any kind of code refactoring to VS that Eclipse doesn't have?

  - by Roman A. Taycher

  And if so are there Eclipse plugins that add those types of code refactoring to eclipse? note:for C#/Java respectively.

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• How to handle error in this case? By Exceptions or boolean or something else

  - by TP

  I am trying to create a Response class in Java which has a method void setResponse(String response); Different response subclasses will have different requirements for the response. The string that is passed to the function is received from the user. What is the correct way of handling a wrong response? Should the function throw an exception like IllegalResponseException Should the function be declared like boolean setResponse(String response, String errorMsg) and return false if the response is wrong and set the error message to the appropriate value

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• Web Application

  - by Raydon

  I'm designing a web application. I was wondering if it was feasible to design a php front end (using some php framework e.g. CakePHP), which stores and retrieves data to display to the user. Then develop a java backend which listens to the database for changes, and depending on what was changed, performs some actions and updates the database. Any thoughts on this type of implementation would be appreciated.

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• Calling outer class function from inner class

  - by santose

  hi, I have implemented a nested class in java. And I need to call the outer class method from inner class. //Code class outter{ void show(){ SOP("outter show"); } class inner{ void show(){ SOP("inner show"); } } } How can I call the outter method "show".

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• Where can I find a good introductory tutorial for Spring?

  - by will

  I am a Java developer but up to now have not had any hands on experience using the Spring framework. Does anyone know of anyone good online tutorials that explain the basics and offer good examples and sample code.

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• Embedding a Jar into a C# Form

  - by clone1018

  Ok this situation is a bit difficult. But I am trying to embed a Java Jar into a C# form. Not as a new window or new process. The Jar will be a game that uses the LWJGL library. The C# Form will be a "wrapper" for it with tools and more. Anyone have any ideas? Is this even possible?

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• Feature set of a CMS and frameworks

  - by James P.

  Most people have heard of a Content Management Systems. However, what basic features should an application contain so it can be considered as a true CMS? Also, what Java frameworks could be used to make one?

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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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• how to chose an open source library ?

  - by radi

  hi guys , when every one of us program in java he would need a library (some jars) to complete his work . so when this programmer find some libraries he need . how he can find the best of these libs ? thanks.

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• Why does date is calculated from January 1st, 1970 ?

  - by Vijay Shanker

  Hi, Is there any reason behind using this date as standard for time manipulation? I have seen this standard in Java as well as in Python. These two languages I am aware of. Is other popular languages also follows the same standard? Please describe.

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• How to set bit values which are not divided on byte boundary

  - by changed

  Hi I have a header field of 2 bytes where first four bits are packet type and other 12 bits are for length. but i don't know how to store this values and retrieve them. I am using ms c++ for client and java for server. It is the client which has to set this values and server has to retrieve it. Thanks

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• Please explain the usage of Labeled Statements.

  - by kunjaan

  Is breaking and continuing the only uses of labeled statements in Java? When have you used Labeled Statements in your programs?

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• LinkedBlockingQueue limit ignored?

  - by tgguy

  I created a Java LinkedBlockingQueue like new LinkedBlockingQueue(1) to limit the size of the queue to 1. However, in my testing, this seems to be ignored and there is often several things in the queue at any given time. Why is this?

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• Scanner method to get a char

  - by bizarrechaos

  What is the Scanner method to get a char returned by the keyboard in Java. like nextLine() for String, nextInt() for int, etc.

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• building Q&A website : what CMS to use ?

  - by radi

  hi guys , i want to design a small website like stackoverflow (but in deferent language) and i want to use an opensource secure scalable cms to do that , so what cms to use ? ( i prefer using java ) thanks .

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• Why would an Enum implement an Interface?

  - by kunjaan

  I just found out that Java allows enums to implement an interface. What would be a good use case for that?

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• Code formatting for initializing lists

  - by Roman

  I've just found in my java project this code snippet: List<IssueType> selectedIssueTypes = new ArrayList<IssueType>(); for (Object item : selectedItems) selectedIssueTypes.add((IssueType) item); How do you think, can this style be used?

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• CMS for a fairly large Mobile Website - Please Help Select.

  - by Vinod

  I am looking for :- A mature, scalable and proven CMS solution With Support for Mobilization (Android and iPhone) Good Amount of Customization using Java / .NET Lots of out of the box components to choose from. Please help with recommendations. p.s Are there any Mobile CMS providers which works in a SaaS model?

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• What are C/C++ specific idioms?

  - by Ole Jak

  thay say A good C/C++ programmer should be familiar with language idioms that typically do not exist for ex in Java. What are such idioms?

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• configuring sms lib for use

  - by jabsy

  i want to write an application that sends bulk sms in java and i have a tutorial but i have to configure sms lib for me to use my modem as the port. can somehelp

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• Can I move another program's window to the front of focus?

  - by TwentyMiles

  I am interacting with a third party application using it's API, and would like to move it to the front of focus (so that it is on top of all other open windows) when a user performs a certain action. While I can move my application up and down in the hierarchy pretty easily, there doesn't appear to be a way to interact with other windows. Is it possible to move another program's window to front with Java?

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• How expensive is synchronization?

  - by someguy

  I am writing a networking application using the java.nio api. My plan is to perform I/O on one thread, and handle events on another. To do this though, I need to synchronize reading/writing so that a race condition is never met. Bearing in mind that I need to handle thousands of connections concurrently, is synchronization worth it, or should I use a single thread for I/O and event handling?

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• final fields and thread-safety

  - by pcjuzer

  Should it be all fields, including super-fields, of a purposively immutable java class 'final' in order to be thread-safe or is it enough to have no modifier methods? Suppose I have a POJO with non-final fields where all fields are type of some immutable class. This POJO has getters-setters, and a constructor wich sets some initial value. If I extend this POJO with knocking out modifier methods, thus making it immutable, will extension class be thread-safe?

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• What is the performance cost of calling Thread.isInterrupted()?

  - by Michael Barker

  From the java sources, it look like to drops into native code. Is the cost roughly equivalent to a volatile read or does it need to acquire a lock of some type?

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