大约有 44,000 项符合查询结果（耗时：0.0389秒） [XML]
In log4j, does checking isDebugEnabled before logging improve performance?
...e when it involves invocation of the toString() methods of various objects and concatenating the results.
In the given example, the log message is a constant string, so letting the logger discard it is just as efficient as checking whether the logger is enabled, and it lowers the complexity of the ...
Is it good practice to NULL a pointer after deleting it?
I'll start out by saying, use smart pointers and you'll never have to worry about this.
18 Answers
...
How do I vertically align text in a div?
...the most effective way to align text with a div. I have tried a few things and none seem to work.
30 Answers
...
Hexadecimal To Decimal in Shell Script
... What ? bc is An arbitrary precision calculator language : an external command.
– Gilles Quenot
Nov 7 '12 at 23:40
11
...
A simple explanation of Naive Bayes Classification
I am finding it hard to understand the process of Naive Bayes, and I was wondering if someone could explain it with a simple step by step process in English. I understand it takes comparisons by times occurred as a probability, but I have no idea how the training data is related to the actual datase...
How do you run a crontab in Cygwin on Windows?
Some cygwin commands are .exe files, so you can run them with the standard Windows Scheduler, but others don't have an .exe extension so can't be run from DOS (it seems like).
...
What is the difference between \r and \n?
How are \r and \n different? I think it has something to do with Unix vs. Windows vs. Mac, but I'm not sure exactly how they're different, and which to search for/match in regexes.
...
How to unescape HTML character entities in Java?
Basically I would like to decode a given Html document, and replace all special chars, such as " " -> " " , ">" -> ">" .
...
Lost httpd.conf file located apache [closed]
...ce ps only shows tasks running as me. I had to just try running "httpd -V" and "apache2ctl -V" as Rich Bower suggests.
– John Pankowicz
Jan 17 '16 at 22:22
6
...
Pointer to pointer clarification
...are doing is *ipp get the object at the address held in ipp which is ip1 and then assign to ip1 the value stored in ip2, which is the address of j.
Simply
& --> Address of
* --> Value at
share
|
...