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Why Collections.sort uses merge sort instead of quicksort?
...se you have objects representing email messages, and you sort
them first by date, then by sender. You expect them to be sorted by
date within each sender, but that will only be true if the sort is
stable. That's why we elected to provide a stable sort (Merge Sort)
to sort object references...
What is Dispatcher Servlet in Spring?
...Servlet uses BeanNameUrlHandlerMapping and DefaultAnnotationHandlerMapping by default.
When the target controller is identified, the DispatcherServlet sends request to it. The controller performs some work according to the request
(or delegate it to the other objects), and returns back to the Disp...
What are the differences between local branch, local tracking branch, remote branch and remote track
...origin
You can see which locations these remote names are shortcuts for, by running git remote -v:
$ git remote -v
bitbucket git@bitbucket.org:flimm/example.git (fetch)
bitbucket git@bitbucket.org:flimm/example.git (push)
origin git@github.com:Flimm/example.git (fetch)
origin git@github.com:Flimm...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...tution takes place. A parameter in the replacement list, unless preceded
by a # or ## preprocessing token or followed by a ## preprocessing token (see below), is
replaced by the corresponding argument after all macros contained therein have been
expanded. Before being substituted, each argumen...
How do you run a command for each line of a file?
...
Read a file line by line and execute commands: 4 answers
This is because there is not only 1 answer...
shell command line expansion
xargs dedicated tool
while read with some remarks
while read -u using dedicated fd, for interactive process...
Explain the use of a bit vector for determining if all characters are unique
...re are two differences between them:
Size. int has fixed size, usually 4 bytes which means 8*4=32 bits (flags). Bit vector usually can be of different size or you should specify the size in constructor.
API. With bit vectors you will have easier to read code, probably something like this:
vector....
How to test that no exception is thrown?
... of functionality.
Or, as defined in The art of Unit Testing, 2nd Edition by Roy Osherove, page 11:
A unit test is an automated piece of code that invokes the unit of work being tested, and then checks some assumptions about a single end result of that unit. A unit test is almost always written...
Redis is single-threaded, then how does it do concurrent I/O?
...pporting concurrent I/Os means the server is able to serve several clients by executing several flows corresponding to those clients with only one computation unit. In this context, parallelism would mean the server is able to perform several things at the same time (with multiple computation units)...
How to avoid reverse engineering of an APK file?
...ck for complete avoidance of reverse engineering.
And also very well said by @inazaruk: Whatever you do to your code, a potential attacker is able to change it in any way she or he finds it feasible. You basically can't protect your application from being modified. And any protection you put in the...
What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
...tinct from any other invocation of this
constructor.
could be extended by "across threads" and "uncorrelated"
Seed Sequence Quality
But the randomness of the seeding sequence is only as good as the underlying RNG.
The RNG used for the seed sequence in this java implementation uses a multiplic...