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Inheritance vs. Aggregation [closed]
...o any class:
Its interface: the "public face" of the object. This is the set of capabilities it announces to the rest of the world. In a lot of languages, the set is well defined into a "class". Usually these are the method signatures of the object, though it varies a bit by language.
Its implemen...
How to find all the subclasses of a class given its name?
...ubsubclasses, you'll have to recurse:
def all_subclasses(cls):
return set(cls.__subclasses__()).union(
[s for c in cls.__subclasses__() for s in all_subclasses(c)])
print(all_subclasses(Foo))
# {<class '__main__.Bar'>, <class '__main__.Baz'>, <class '__main__.Bing'>}
...
Override Java System.currentTimeMillis for testing time sensitive code
...
Clock.fixed(
Instant.parse( "2016-01-23T12:34:56Z"), ZoneOffset.UTC
)
)
Clock In java.time
We have a new solution to the problem of a pluggable clock replacement to facilitate testing with faux date-time values. The java.time package in Java 8 includes an abstract class java.time...
Why is Linux called a monolithic kernel?
...efines alone a high-level virtual interface over computer hardware, with a set of primitives or system calls to implement all operating system services such as process management, concurrency, and memory management itself and one or more device drivers as modules.
Recent versions of Windows on the...
Hibernate Annotations - Which is better, field or property access?
...b or BeanMapper or Dozer or other bean mapping/cloning lib based on getter/setter properties) you'll have the guarantee that the lib is in sync with the persistence manager (both use the getter/setter).
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How do I get my Maven Integration tests to run
...
You can set up Maven's Surefire to run unit tests and integration tests separately. In the standard unit test phase you run everything that does not pattern match an integration test. You then create a second test phase that runs j...
Use of Application.DoEvents()
...atches paint messages, it delivers everything else as well.
And there's a set of notifications that cause trouble. They come from about 3 feet in front of the monitor. The user could for example close the main window while the loop that calls DoEvents() is running. That works, user interface is ...
How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
...erride
public void onCreate(Bundle savedInstanceState) {
//this to set delegate/listener back to this class
asyncTask.delegate = this;
//execute the async task
asyncTask.execute();
}
//this override the implemented method from asyncTask
@Override
void processFinish(...
What is the correct way to represent null XML elements?
...hen no author tag is even present. This may be semantically different than setting it to 'nil' (Ex. Setting "Series" to nil may be that the book belongs to no series, while omitting series could mean that series is an inapplicable element to the current element.)
From: The W3C
XML Schema: Struc...
How can I check if a program exists from a Bash script?
...o system.
Why care?
Many operating systems have a which that doesn't even set an exit status, meaning the if which foo won't even work there and will always report that foo exists, even if it doesn't (note that some POSIX shells appear to do this for hash too).
Many operating systems make which do ...