大约有 32,000 项符合查询结果（耗时：0.0582秒） [XML]
Performance optimization strategies of last resort [closed]
...ly what it is doing, but I can't seem to find anything that I can improve. Then I reflect on the basic design of the program, on its transaction-driven structure, and ask if all the list-searching that it is doing is actually mandated by the requirements of the problem.
Then I hit upon a re-design,...
How can I randomize the lines in a file using standard tools on Red Hat Linux?
... you don't use it.
Consider a shell script:
#!/bin/sh
if [[ $# -eq 0 ]]
then
echo "Usage: $0 [file ...]"
exit 1
fi
for i in "$@"
do
perl -MList::Util -e 'print List::Util::shuffle <>' $i > $i.new
if [[ `wc -c $i` -eq `wc -c $i.new` ]]
then
mv $i.new $i
else
echo "Err...
Catch multiple exceptions in one line (except block)
...isleading because you may create a tuple without parentheses elsewhere and then use it in the except line. It is only necessarily parenthesized if created in the except line.
– BallpointBen
Mar 22 '18 at 16:48
...
How do I clone a subdirectory only of a Git repository?
...if you have several directories that are always checked out independently, then these are really two different projects and should live in two different repositories. You can glue them back together using Git Submodules.
sha...
Performance of Arrays vs. Lists
...y of the array is reached.
Suppose you have a List with a Capacity of 10, then the List will increase it's capacity once you want to add the 11th element.
You can decrease the performance impact by initializing the Capacity of the list to the number of items it will hold.
But, in order to figure o...
How do I view cookies in Internet Explorer 11 using Developer Tools
...e the Internet Explorer cache.
This can be done via "run" (Windows+r) and then typing in shell:cache or by navigating to it through the internet options in IE11 (AskLeo has a fine guide to this, I'm not affiliated in any way).
Click on the gear icon, then Internet options.
In the General ...
What is the memory consumption of an object in Java?
... compile two versions of a method, each optimized for a certain situation, then decide up front which one to call.
Then of course the hardware and OS have multilayer caches, on chip-cache, SRAM cache, DRAM cache, ordinary RAM working set and backing store on disk. Your data may be duplicate...
Can a unit test project load the target application's app.config file?
...t's a lot easier to just add an app.config fiel to the test project -- you then don't need to play around with the .testrunconfig at all.
– Rowland Shaw
Jan 14 '09 at 12:20
13
...
Git commit with no commit message
...
And if you add an alias for it then it's even better right?
git config --global alias.nccommit 'commit -a --allow-empty-message -m ""'
Now you just do an nccommit, nc because of no comment, and everything should be commited.
...
How to properly compare two Integers in Java?
... a character literal between '\u0000' and '\u007f'
inclusive (§3.10.4), then let a and b be the results of any two boxing
conversions of p. It is always the case that a == b.
Personally I'd use:
if (x.intValue() == y.intValue())
or
if (x.equals(y))
As you say, for any comparison between...