大约有 40,658 项符合查询结果（耗时：0.0427秒） [XML]
Thymeleaf: how to use conditionals to dynamically add/remove a CSS class
By using Thymeleaf as template engine, is it possible to add/remove dynamically a CSS class to/from a simple div with the th:if clause?
...
Android mock location on device?
...n I mock my location on a physical device (Nexus One)? I know you can do this with the emulator in the Emulator Control panel, but this doesn't work for a physical device.
...
Why should a Java class implement comparable?
Why is Java Comparable used? Why would someone implement Comparable in a class? What is a real life example where you need to implement comparable?
...
Rails 3: Get Random Record
...irst
Actually, in Rails 3 all examples will work. But using order RANDOM is quite slow for big tables but more sql-style
UPD. You can use the following trick on an indexed column (PostgreSQL syntax):
select *
from my_table
where id >= trunc(
random() * (select max(id) from my_table) + 1
)...
Allow user to select camera or gallery for image
...e your own chooser dialog merging both intent resolution results.
To do this, you will need to query the PackageManager with PackageManager.queryIntentActivities() for both original intents and create the final list of possible Intents with one new Intent for each retrieved activity like this:
Lis...
How to run functions in parallel?
... threading or multiprocessing.
Due to peculiarities of CPython, threading is unlikely to achieve true parallelism. For this reason, multiprocessing is generally a better bet.
Here is a complete example:
from multiprocessing import Process
def func1():
print 'func1: starting'
for i in xrange(...
__getattr__ on a module
...efining __enter__ and __exit__, before those tricks broke.
Recently some historical features have made a comeback, the module __getattr__ among them, and so the existing hack (a module replacing itself with a class in sys.modules at import time) should be no longer necessary.
In Python 3.7+, you ...
How can I distribute python programs?
My application looks like this:
7 Answers
7
...
How should I escape strings in JSON?
... library in your language, you don't want to use one (I wouldn't suggest this¹), or you're writing a JSON library, read on.
Escape it according to the RFC. JSON is pretty liberal: The only characters you must escape are \, ", and control codes (anything less than U+0020).
This structure of escapi...
How to cast an Object to an int
...
If you're sure that this object is an Integer :
int i = (Integer) object;
Or, starting from Java 7, you can equivalently write:
int i = (int) object;
Beware, it can throw a ClassCastException if your object isn't an Integer and a NullPointer...