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What does the servlet value signify
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Resin 3.0 documents this behavior:
load-on-startup can specify an (optional) integer value. If the value is 0 or greater,
it indicates an order for servlets to be loaded, servlets with higher numbers get
loaded after servlets with lower numbers.
The JSP 3.1 spec (JSR 340) says ...
How to iterate over values of an Enum having flags?
If I have a variable holding a flags enum, can I somehow iterate over the single-bit values in that specific variable? Or do I have to use Enum.GetValues to iterate over the entire enum and check which ones are set?
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Python, compute list difference
In Python, what is the best way to compute the difference between two lists?
14 Answers
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How to delete the contents of a folder?
...r(folder):
file_path = os.path.join(folder, filename)
try:
if os.path.isfile(file_path) or os.path.islink(file_path):
os.unlink(file_path)
elif os.path.isdir(file_path):
shutil.rmtree(file_path)
except Exception as e:
print('Failed to delet...
What is the use case of noop [:] in bash?
...ment. The label could be any text, so : doubled up as a comment indicator (if there is no goto comment, then : comment is effectively a comment). The Bourne shell didn't have goto but kept :.
A common idiom that uses : is : ${var=VALUE}, which sets var to VALUE if it was unset and does nothing if v...
delete vs delete[] operators in C++
What is the difference between delete and delete[] operators in C++?
7 Answers
7
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Java null check why use == instead of .equals()
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They're two completely different things. == compares the object reference, if any, contained by a variable. .equals() checks to see if two objects are equal according to their contract for what equality means. It's entirely possible for two distinct...
Override back button to act like home button
...works in the same way, so the example in the docs seems a bit misleading.) If that's the case, then your Activity can finish as usual and the Service will still be running.
A simpler approach is to capture the Back button press and call moveTaskToBack(true) as follows:
// 2.0 and above
@Override
p...
Update value of a nested dictionary of varying depth
...port collections
def update(d, u):
for k, v in u.iteritems():
if isinstance(v, collections.Mapping):
d[k] = update(d.get(k, {}), v)
else:
d[k] = v
return d
Python 3:
import collections.abc
def update(d, u):
for k, v in u.items():
if is...
What is the meaning of addToBackStack with null parameter?
...n and bring back the
previous fragment by pressing the Back button.
If you add multiple changes to the transaction (such as another add()
or remove()) and call addToBackStack(), then all changes applied
before you call commit() are added to the back stack as a single
transaction and the...