大约有 45,000 项符合查询结果（耗时：0.0386秒） [XML]
Difference between Service, Async Task & Thread?
...em are used to do some stuff in background. So, how to decide which to use and when?
6 Answers
...
What is the use of the %n format specifier in C?
...
@AndrewS: Because the function will modify the value of the variable.
– Jack
Jun 20 '14 at 0:31
3
...
How to replace a whole line with sed?
...lish this:
sed -i "/aaa=/c\aaa=xxx" your_file_here
This will go through and find any lines that pass the aaa= test, which means that the line contains the letters aaa=. Then it replaces the entire line with aaa=xxx. You can add a ^ at the beginning of the test to make sure you only get the line...
java.util.regex - importance of Pattern.compile()?
...ld of the Matcher object is through the Pattern object's matcher() method, and the only way to get ahold of the Pattern object is through the compile() method. Then there's the find() method which, unlike matches(), is not duplicated in the String or Pattern classes.
The other reason is to avoid ...
How can I check if a file exists in Perl?
...supported by the file system).
-p
File is a named pipe (FIFO), or Filehandle is a pipe.
-S
File is a socket.
-b
File is a block special file.
-c
File is a character special file.
-t
Filehandle is opened to a tty.
-u
File has setuid bit set.
-g
File has setgid bit set.
-...
Is there a print_r or var_dump equivalent in Ruby / Ruby on Rails?
...to dump the structure of an object, similar to the PHP functions print_r and var_dump for debugging reasons.
10 Answers...
What are the differences between poll and select?
I am referring to the POSIX standard select and poll system C API calls.
3 Answers
...
Error starting jboss server
I've just finished re-installing my OS, and as always install and test standard tools which I use, and now I get this error like never before when I tried to start Jboss 5 from eclipse, its quite big exeption :
...
Git keeps asking me for my ssh key passphrase
...ed keys as instructed in the github tutorial, registered them with github, and tried using ssh-agent explicitly — yet git continues to ask me for my passphrase every time I try to do a pull or a push.
...
Why is vertical-align: middle not working on my span or div?
...ng happens. I've tried changing the display properties of both elements, and nothing seems to work.
16 Answers
...