大约有 37,000 项符合查询结果（耗时：0.0294秒） [XML]
Get string character by index - Java
...t the index of a certain character or number in a string, but is there any predefined method I can use to give me the character at the nth position? So in the string "foo", if I asked for the character with index 0 it would return "f".
...
How to find where a method is defined at runtime?
We recently had a problem where, after a series of commits had occurred, a backend process failed to run. Now, we were good little boys and girls and ran rake test after every check-in but, due to some oddities in Rails' library loading, it only occurred when we ran it directly from Mongrel in pro...
How do I get the file extension of a file in Java?
Just to be clear, I'm not looking for the MIME type.
30 Answers
30
...
Setting the MySQL root user password on OS X
I just installed MySQL on Mac OS X. The next step was setting the root user password, so I did this next:
23 Answers
...
Delete all but the most recent X files in bash
Is there a simple way, in a pretty standard UNIX environment with bash, to run a command to delete all but the most recent X files from a directory?
...
How can two strings be concatenated?
How can I concatenate (merge, combine) two values?
For example I have:
12 Answers
12
...
PostgreSQL disable more output
I am running a script on my PostgreSQL server:
6 Answers
6
...
When does invoking a member function on a null instance result in undefined behavior?
...r. It's always undefined behavior to call a member function through a null pointer. If the function is static, it's technically undefined as well, but there's some dispute.
The first thing to understand is why it's undefined behavior to dereference a null pointer. In C++03, there's actually a bit...
Why is GHC so large/big?
Is there a simple answer: Why is GHC so big?
6 Answers
6
...
What is a good Hash Function?
What is a good Hash function? I saw a lot of hash function and applications in my data structures courses in college, but I mostly got that it's pretty hard to make a good hash function. As a rule of thumb to avoid collisions my professor said that:
...