大约有 11,295 项符合查询结果（耗时：0.0235秒） [XML]
What happens when a duplicate key is put into a HashMap?
...
By definition, the put command replaces the previous value associated with the given key in the map (conceptually like an array indexing operation for primitive types).
The map simply drops its reference to the value. If no...
Check time difference in Javascript
How would you check time difference from two text-boxes in Javascript?
17 Answers
17
...
How do I increase the scrollback buffer in a running screen session?
...session I am interacting with through putty. I've realized that the scrollback buffer is too small and would like to increase it without starting a new screen session.
...
How to avoid the “divide by zero” error in SQL?
...
In order to avoid a "Division by zero" error we have programmed it like this:
Select Case when divisor=0 then null
Else dividend / divisor
End ,,,
But here is a much nicer way of doing it:
Select dividend / NULLIF(divisor, 0) ...
Now the only proble...
How can I get Git to follow symlinks?
Is my best be going to be a shell script which replaces symlinks with copies, or is there another way of telling Git to follow symlinks?
...
UnicodeEncodeError: 'charmap' codec can't encode - character maps to , print function [du
I am writing a Python (Python 3.3) program to send some data to a webpage using POST method. Mostly for debugging process I am getting the page result and displaying it on the screen using print() function.
...
Python List vs. Array - when to use?
...n implement it as a List, or else use the 'array' module in the standard library. I have always used Lists for 1d arrays.
...
Should one use < or
...
The first is more idiomatic. In particular, it indicates (in a 0-based sense) the number of iterations. When using something 1-based (e.g. JDBC, IIRC) I might be tempted to use <=. So:
for (int i=0; i < count; i++) // For 0-based APIs
for (int i=1; i <= count; i++) // For 1-base...
How to clone git repository with specific revision/changeset?
...
UPDATE 2 Since Git 2.5.0 the feature described below can be enabled on server side with configuration variable uploadpack.allowReachableSHA1InWant, here the GitHub feature request and the GitHub commit enabling this feature. Note that some Git servers activate this op...
ERROR 1396 (HY000): Operation CREATE USER failed for 'jack'@'localhost'
I seem to be unable to re-create a simple user I've deleted, even as root in MySQL.
24 Answers
...