大约有 31,840 项符合查询结果（耗时：0.0280秒） [XML]
Are Java static calls more or less expensive than non-static calls?
Is there any performance benefit one way or another? Is it compiler/VM specific? I am using Hotspot.
12 Answers
...
Cannot obtain value of local or argument as it is not available at this instruction pointer, possibl
Visual Studio 2010 kills (there is no other word) data in one of the arguments of the function in the unsafe block.
What could cause this error? The following message shows by the debugger.
...
How to Display Selected Item in Bootstrap Button Dropdown Title
I am using the bootstrap Dropdown component in my application like this:
14 Answers
14...
Hibernate: hbm2ddl.auto=update in production?
...t's not mission critical and with no highly paid DBAs on staff. It's just one less manual process that's subject to human error - the application can detect the difference and do the right thing, plus you've presumably tested it in various development and test environments.
One caveat - in a clus...
Putting git hooks into repository
...eive post-update pre-auto-gc"
# assuming the script is in a bin directory, one level into the repo
HOOK_DIR=$(git rev-parse --show-toplevel)/.git/hooks
for hook in $HOOK_NAMES; do
# If the hook already exists, is executable, and is not a symlink
if [ ! -h $HOOK_DIR/$hook -a -x $HOOK_DIR/$ho...
static const vs #define
...
String constants specifically are one of those that might benefit from being #defined, at least if they can be used as "building blocks" for bigger string constants. See my reply for an example.
– AnT
Oct 28 '09 at 14:10...
Prevent users from submitting a form by hitting Enter
...fix, and don't have time to implement validation items. I appreciate everyone's answers, but this is the one i'm going to go with in the mean time. thank you.
– DForck42
May 22 '09 at 13:42
...
Clearing all cookies with JavaScript
...
Nice one, but after experimenting, I found that a site can have only one cookie without =, and then it is a nameless cookie, you get its value actually. So if eqPos == 1, you should do name = "" instead, to erase the nameless valu...
Determine if 2 lists have the same elements, regardless of order? [duplicate]
... using sets.
Empirical Experiment
An empirical experiment concludes that one should prefer set, then sorted. Only opt for Counter if you need other things like counts or further usage as a multiset.
First setup:
import timeit
import random
from collections import Counter
data = [str(random.rand...
ROW_NUMBER() in MySQL
...gle highest col3 for each (col1, col2) pair.
That's a groupwise maximum, one of the most commonly-asked SQL questions (since it seems like it should be easy, but actually it kind of isn't).
I often plump for a null-self-join:
SELECT t0.col3
FROM table AS t0
LEFT JOIN table AS t1 ON t0.col1=t1.co...