大约有 45,000 项符合查询结果（耗时：0.0541秒） [XML]
How do you cast a List of supertypes to a List of subtypes?
... List<B> b = new ArrayList<>();
List<A> a = b; // error, List<B> is not of type List<A>
Furthermore, we can't even write
List<B> b = new ArrayList<>();
List<A> a = (List<A>)b; // error, List<B> is not of type List<A>...
How do I check if a string contains another string in Swift?
... use someString.containsString(anotherString), you will get a compile time error that states 'String' does not contain a member named 'containsString'.
So, you're left with a few options, one of which is to explicitly bridge your String to Objective-C by using bridgeToObjectiveC() other two involve...
Where is the “Create Unit Tests” selection?
...
I get the same error as LockTar when i try this. So the easyest way to use unit test is to make a new unit test projekt.
– saadan
Dec 7 '12 at 13:50
...
Create a devise user from Ruby console
...irmation => 'password')
u.save
if this returns false, you can call
u.errors
to see what's gone wrong.
share
|
improve this answer
|
follow
|
...
Swapping column values in MySQL
....02 sec)
mysql> update z set c1 = c1 ^ c2, c2 = c1 ^ c2, c1 = c1 ^ c2;
ERROR 1264 (22003): Out of range value for column 'c1' at row 2
mysql> update z set c1 = c1 + c2, c2 = c1 - c2, c1 = c1 - c2;
ERROR 1264 (22003): Out of range value for column 'c1' at row 3
mysql> select * from z;
+---...
How do you take a git diff file, and apply it to a local branch that is a copy of the same repositor
...
Thanks for the reply, but that caused an error saying, patch failed: filename.php:202 error:filename.php: patch does not apply. The good news is that its not the first filename in the file, so it at least would have been able to process some of the file. Any thou...
Does it make sense to use “as” instead of a cast even if there is no null check? [closed]
...ng for a NullReferenceException or ArgumentNullException or even a logical error sometime in the future. In general, an as expression that's not followed by a null check somewhere is a code smell.
On the other hand, if you are not sure about the cast and expect it to fail, you should use as instead...
How to add calendar events in Android?
...n to avoid java.lang.IllegalArgumentException column visibility is invalid error */
/*eventValues.put("visibility", 3); // visibility to default (0),
// confidential (1), private
// (2), or public (3):
eventValu...
Is it possible to delete an object's property in PHP?
... object.
unset($object[$key])
Update
Newer versions of PHP throw fatal error Fatal error: Cannot use object of type Object as array as mentioned by @CXJ . In that case you can use brackets instead
unset($object{$key})
...
PHP exec() vs system() vs passthru()
...n status"). Zero usually means it was successful, other values are usually error codes.
Other misc things to be aware of:
The shell_exec() and the backticks operator do the same thing.
There are also proc_open() and popen() which allow you to interactively read/write streams with an executing co...