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Polymorphism vs Overriding vs Overloading
...ften one of its ancestor classes. For example, in Java all classes inherit from Object. Therefore, you can create a variable of type Object and assign to it an instance of any class.
An override is a type of function which occurs in a class which inherits from another class. An override function "r...
What is difference between CrudRepository and JpaRepository interfaces in Spring Data JPA?
...example for this is deleteInBatch(…) of JpaRepository which is different from delete(…) as it uses a query to delete the given entities which is more performant but comes with the side effect of not triggering the JPA-defined cascades (as the spec defines it).
We generally recommend not to use ...
performSelector may cause a leak because its selector is unknown
...round. Here's how:
if (!_controller) { return; }
SEL selector = NSSelectorFromString(@"someMethod");
IMP imp = [_controller methodForSelector:selector];
void (*func)(id, SEL) = (void *)imp;
func(_controller, selector);
Or more tersely (though hard to read & without the guard):
SEL selector =...
How to rename files and folder in Amazon S3?
...d it works:
aws s3 --recursive mv s3://<bucketname>/<folder_name_from> s3://<bucket>/<folder_name_to>
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What's a good (free) visual merge tool for Git? (on windows) [closed]
... mouseover descriptions. Another - Beyond Compare provides buttons to move from one difference to the next. Another - Beyond Compare shows the file paths in the window title bars. Meld was certainly "Good enough", but I'd rather pay for Beyond Compare. (And I have no affiliation with Beyond Compare)...
PHP Composer update “cannot allocate memory” error (using Laravel 4)
... update all the components, if there is no update, it picks up the package from the cache else picks up from the dist
Note: Please change the memory limit as per your choice.
or
Create a swap partition and try. Swap partition is the portion of the hard drive that linux uses as virtual memory whe...
How do I generate a stream from a string?
I need to write a unit test for a method that takes a stream which comes from a text file. I would like to do do something like this:
...
Best approach for GPGPU/CUDA/OpenCL in Java?
... variants, thanks to its use of JNA).
It has demos that actually run fine from Java Web Start at least on Mac and Windows (to avoid random crashes on Linux, please see this wiki page, such as this Particles Demo.
It also comes with a few utilities (GPGPU random number generation, basic parallel re...
What's the Android ADB shell “dumpsys” tool and what are its benefits?
...application
affects the overall device!
What information can we retrieve from dumpsys shell command and how we can use it
If you run dumpsys you would see a ton of system information. But you can use only separate parts of this big dump.
to see all of the "subcommands" of dumpsys do:
dumpsys | ...
Which parts of Real World Haskell are now obsolete or considered bad practice?
...eady used 4.0.0.0, which introduced many changes. And that's just the jump from 6.8 to 6.10. The current version of GHC is 7.10. Monads have been changed. There's currently a discussion to remove return from Monad, so the Monad instance in Real World Haskell will really be out of sync with the real ...