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iterating over and removing from a map [duplicate]
... set is backed by the map, so changes to the map are reflected in the set, and vice-versa
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How to check if Receiver is registered in Android?
...nregisterReceiver(BroadcastReceiver) passing itself as the argument after handling the Intent that it receives.
There is a small chance that the receiver's onReceive(Context, Intent) method is called
more than once, since it is registered with multiple IntentFilters, creating the potential for a...
What's the simplest way to subtract a month from a date in Python?
...// 12
if not m: m = 12
d = min(date.day, [31,
29 if y%4==0 and (not y%100==0 or y%400 == 0) else 28,
31,30,31,30,31,31,30,31,30,31][m-1])
return date.replace(day=d,month=m, year=y)
>>> for m in range(-12, 12):
print(monthdelta(datetime.now(), m))
2009-...
Is iterating ConcurrentHashMap values thread safe?
... obtain from a ConcurrentHashMap is designed to be used by a single thread and should not be passed around. This includes the syntactic sugar that the for-each loop provides.
What happens if I try to iterate the map with two threads at the same time?
It will work as expected if each of the thr...
Location of sqlite database on the device
...base programmatically with the default way of extending SQLiteOpenHelper and overriding onCreate() . This way the db gets created on the fly when needed.
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Creating anonymous objects in php
... so there may be a few differences between anonymous classes in JavaScript and PHP.
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In Python, how do I iterate over a dictionary in sorted key order?
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This is not obvious. In fact, items() creates a list and therefore uses memory, whereas iteritems() essentially does not use memory. What to use mostly depend on the size of the dictionary. Furthermore, the automatic Python 2 to Python 3 conversion tool (2to3) automatically tak...
method overloading vs optional parameter in C# 4.0 [duplicate]
...DoFoo(c:"Hello There, John Doe")
This call takes parameter a value as 10 and parameter b as 23.
Another variant of this call - notice you don't need to set the parameter values in the order as they appear in the method signature, the named parameter makes the value explicit.
DoFoo(c:"hello again...
Illegal mix of collations MySQL Error
...ly refuses to change from 'ucs2_bin' so even tried changing all the tables and the connection collation to 'usc2_bin' but I still get the error "SQL Error (1267): Illegal mix of collations (utf8_general_ci,IMPLICIT) and (ucs2_bin,IMPLICIT) for operation '='".
– bikeman868
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Collections.emptyList() vs. new instance
...ses where you do want to modify the returned list, Collections.emptyList() and List.of() are thus not a good choices.
I'd say that returning an immutable list is perfectly fine (and even the preferred way) as long as the contract (documentation) does not explicitly state differently.
In addition...