大约有 41,000 项符合查询结果（耗时：0.0494秒） [XML]
Create folder with batch but only if it doesn't already exist
...u just use this: if not exist "C:\VTS\" mkdir C:\VTS it wll create a directory only if the folder does not exist.
Note that this existence test will return true only if VTS exists and is a directory. If it is not there, or is there as a file, the mkdir command will run, and should cause an error. ...
Singleton: How should it be used
...an answer that has links to a lot of questions/answers about singletons: More info about singletons here:
24 Answers
...
How to use php serialize() and unserialize()
...
A PHP array or object or other complex data structure cannot be transported or stored or otherwise used outside of a running PHP script. If you want to persist such a complex data structure beyond a single run of a script, you need to se...
How to disable mouse scroll wheel scaling with Google Maps API
...false, mapTypeControl: false, scaleControl: false
– Jordan Arseno
May 1 '13 at 4:55
1
...
Spring MVC: How to perform validation?
I would like to know what is the cleanest and best way to perform form validation of user inputs. I have seen some developers implement org.springframework.validation.Validator . A question about that: I saw it validates a class. Does the class have to be filled manually with the values from the us...
How to delete the contents of a folder?
...
import os, shutil
folder = '/path/to/folder'
for filename in os.listdir(folder):
file_path = os.path.join(folder, filename)
try:
if os.path.isfile(file_path) or os.path.islink(file_path):
os.unlink(fi...
What is duck typing?
...that do not have strong typing.
The idea is that you don't need a type in order to invoke an existing method on an object - if a method is defined on it, you can invoke it.
The name comes from the phrase "If it looks like a duck and quacks like a duck, it's a duck".
Wikipedia has much more inform...
Android: How can I pass parameters to AsyncTask's onPreExecute()?
I use an AsyncTask for loading operations that I implemented as an inner class.
4 Answers
...
When do you use map vs flatMap in RxJava?
...
map transform one event to another.
flatMap transform one event to zero or more event. (this is taken from IntroToRx)
As you want to transform your json to an object, using map should be enough.
Dealing with the FileNotFoundException...
Creating a byte array from a stream
What is the prefered method for creating a byte array from an input stream?
16 Answers
...