大约有 30,000 项符合查询结果（耗时：0.0627秒） [XML]
Can you explain the HttpURLConnection connection process?
...RLConnection with the URL object - A new
// connection is opened every time by calling the openConnection
// method of the protocol handler for this URL.
// 1. This is the point where the connection is opened.
HttpURLConnection connection = (HttpURLConnection) url
.openCo...
What is Rack middleware?
...r
def initialize(app)
@app = app
end
def call(env)
@start = Time.now
@status, @headers, @body = @app.call(env)
@duration = ((Time.now - @start).to_f * 1000).round(2)
puts "#{env['REQUEST_METHOD']} #{env['REQUEST_PATH']} - Took: #{@duration} ms"
[@status, @headers, @bo...
Why does C++ not have reflection?
...work to add, and the C++ committee is fairly conservative, and don't spend time on radical new features unless they're sure it'll pay off. (A suggestion for adding a module system similar to .NET assemblies has been made, and while I think there's general consensus that it'd be nice to have, it's...
Can Selenium interact with an existing browser session?
... It works for me except a duplicate dummy browser is raising each time.
– Pavel Vlasov
Jan 10 '18 at 18:56
I ...
Nginx 403 error: directory index of [folder] is forbidden
...lad to hear I am helpful. (Help others, in your known domain, in your free time, if possible, without expecting anything back)
– Manohar Reddy Poreddy
Sep 15 '15 at 7:39
...
How to detect incoming calls, in an Android device?
...State = TelephonyManager.CALL_STATE_IDLE;
private static Date callStartTime;
private static boolean isIncoming;
private static String savedNumber; //because the passed incoming is only valid in ringing
@Override
public void onReceive(Context context, Intent intent) {
...
Right way to reverse pandas.DataFrame?
...lith Some libraries expect the data frame to be indexed. For example, some time series forecasting libraries expect an indexed frame as input so that it can model a time series while remaining agnostic to the time step (day, month, year, etc.). So you may be working with a data frame, do a transform...
Example use of “continue” statement in Python?
...t be reproduced without it, although not having it can be expensive in run-time.
– Sparr
Jul 14 '14 at 15:27
add a comment
|
...
LINQ: Distinct values
...e hash code means that every previously returned element is examined every time. A more robust hash code would speed things up because it would only compare against elements in the same hash bucket. Zero is a reasonable default, but it might be worth supporting a second lambda for the hash code.
...
Remove an entire column from a data.frame in R
...me, when the column names are known (as opposed to being determined at run-time), I like the subset() syntax. E.g. for the data-frame
df <- data.frame(a=1:3, d=2:4, c=3:5, b=4:6)
to remove just the a column you could do
Data <- subset( Data, select = -a )
and to remove the b and d column...