Does somebody know a Java library which serializes a Java object hierarchy into Java code which generates this object hierarchy? Like Object/XML serialization, only that the output format is not binary/XML but Java code. Answer I am not aware of any libraries that will do this out of the box but you should be…
How does the Java ‘for each’ loop work?
Consider: What would the equivalent for loop look like without using the for each syntax? Answer Note that if you need to use i.remove(); in your loop, or access the actual iterator in some way, you cannot use the for ( : ) idiom, since the actual iterator is merely inferred. As was noted by Denis Bueno, this…
Is there a benefit to defining a class inside another class in Python?
What I’m talking about here are nested classes. Essentially, I have two classes that I’m modeling. A DownloadManager class and a DownloadThread class. The obvious OOP concept here is composition. However, composition doesn’t necessarily mean nesting, right? I have code that looks something l…
Why doesn’t Java offer operator overloading?
Coming from C++ to Java, the obvious unanswered question is why didn’t Java include operator overloading? Isn’t Complex a, b, c; a = b + c; much simpler than Complex a, b, c; a = b.add(c);? Is there a known reason for this, valid arguments for not allowing operator overloading? Is the reason arbit…
Ant is not able to delete some files on windows
I have an ant build that makes directories, calls javac and all the regular stuff. The issue I am having is that when I try to do a clean (delete all the stuff that was generated) the delete task reports that is was unable to delete some files. When I try to delete them manually it works just fine. The
Quick and easy way to test OSGi bundles
Currently, I am working on a new version control system as part of a final year project at University. The idea is to make it highly adaptable and pluggable. We’re using the OSGi framework (Equinox implementation) to manage our plug ins. My problem is that I can’t find a simple & easy to use m…
Can I add maven repositories in the command line?
I’m aware I can add maven repositories for fetching dependencies in ~/.m2/settings.xml. But is it possible to add a repository using command line, something like: The reason I want to do this is because I’m using a continuous integration tool where I have full control over the command line options…
What is an efficient way to implement a singleton pattern in Java? [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago. Improve this question What is an efficient way to implement a singleton design pattern in Java? …
How can I find the response time of a HTTP request through a Socket
I’m using a Java socket, connected to a server. If I send a HEADER http request, how can I measure the response time from the server? Must I use a provided java timer, or is there an easier way? I’m looking for a short answer, I don’t want to use other protocols etc. Obviously do I neither w…
How to create a windows service from java app
I’ve just inherited a java application that needs to be installed as a service on XP and vista. It’s been about 8 years since I’ve used windows in any form and I’ve never had to create a service, let alone from something like a java app (I’ve got a jar for the app and a single de…