大约有 48,000 项符合查询结果（耗时：0.0646秒） [XML]
What does 'synchronized' mean?
...e questions regarding the usage and significance of the synchronized keyword.
17 Answers
...
How to get the last value of an ArrayList
...
Won't work. what if the list is empty, list.size() will return 0. and you'll end up with list.get(-1);
– FRR
Jan 21 '15 at 19:36
...
What is the difference between parseInt() and Number()?
...
Well, they are semantically different, the Number constructor called as a function performs type conversion and parseInt performs parsing, e.g.:
// parsing:
parseInt("20px"); // 20
parseInt("10100", 2); // 20
parseInt("2e1"); // 2
// type conversion
Number("20px"); ...
Can't escape the backslash with regex?
... (because the string parser will remove two of them when "de-escaping" it for the string, and then the regex needs two for an escaped regex backslash).
For instance:
regex("\\\\")
is interpreted as...
regex("\\" [escaped backslash] followed by "\\" [escaped backslash])
is interpreted as...
r...
Comparing numbers in Bash
I'm starting to learn about writing scripts for the bash terminal, but I can't work out how to get the comparisons to work properly. The script I'm using is:
...
lock(new object()) — Cargo cult or some crazy “language special case”?
... it can only run once at a time
// e.g. comands on the Mars Rover, or programs on iOS pre 4 / 5 ??
}
}
and thought he could cut the number of lines.
I'd be very worried if that were the case though...
share
...
An example of how to use getopts in bash
...should return 0, upon hitting a non-existing flag it should return >0 (for the sake of simplicity I didn't differentiate between those cases and nobody forces you to print the usage text in the latter case). I have seen programs which always return != 0, though, even on -h/--help. Maybe I should ...
What is the HEAD in git?
... the last commit, the HEAD and the state of the file I can see in my directory.
5 Answers
...
Unable to find valid certification path to requested target - error even after cert imported
...
Unfortunately - it could be many things - and lots of app servers and other java 'wrappers' are prone to play with properties and their 'own' take on keychains and what not. So it may be looking at something totally different.
...
How to tell which commit a tag points to in Git?
I have a bunch of unannotated tags in the repository and I want to work out which commit they point to. Is there a command that that will just list the tags and their commit SHAs? Checking out the tag and looking at the HEAD seems a bit too laborious to me.
...