大约有 45,000 项符合查询结果（耗时：0.0552秒） [XML]
Calculating the difference between two Java date instances
...lass in Scala and want to compare a Date object and the current time. I know I can calculate the delta by using getTime():
...
MySQL pagination without double-querying?
I was wondering if there was a way to get the number of results from a MySQL query, and at the same time limit the results.
...
How to add 30 minutes to a JavaScript Date object?
....
* Example: dateAdd(new Date(), 'minute', 30) //returns 30 minutes from now.
* https://stackoverflow.com/a/1214753/18511
*
* @param date Date to start with
* @param interval One of: year, quarter, month, week, day, hour, minute, second
* @param units Number of units of the given interval...
adding x and y axis labels in ggplot2
...Area vs. Discharge and Nitrogen Levels (PPM)")
An alternate way to specify just labels (handy if you are not changing any other aspects of the scales) is using the labs function
ggplot(ex1221, aes(Discharge, Area)) +
geom_point(aes(size=NO3)) +
scale_size_area() +
labs(size= "Nitrogen",...
Performance - Date.now() vs Date.getTime()
...ings are the same (edit semantically; performance is a little better with .now()):
var t1 = Date.now();
var t2 = new Date().getTime();
However, the time value from any already-created Date instance is frozen at the time of its construction (or at whatever time/date it's been set to). That is, if ...
How to send email attachments?
...
Here is the modified version from Oli for python 3
import smtplib
from pathlib import Path
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.text import MIMEText
from email.utils import COM...
How to create PDF files in Python [closed]
...e. (Source: Ctrl+F through its documentation page)
Which is great, but not if you have images that are not already embedded in a PDF.
pyPDF2 doesn't seem to have any extra documentation on top of pyPDF.
ReportLab is very extensive. (Userguide) However, with a bit of Ctrl+F and grepping through its s...
Unable to modify ArrayAdapter in ListView: UnsupportedOperationException
I'm trying to make a list containing names. This list should be modifiable (add, delete, sort, etc). However, whenever I tried to change the items in the ArrayAdapter, the program crashed, with java.lang.UnsupportedOperationException error. Here is my code:
...
What is the difference between UTF-8 and ISO-8859-1?
What is the difference between UTF-8 and ISO-8859-1 ?
8 Answers
8
...
Array initializing in Scala
...
Additional to Vasil's answer: If you have the values given as a Scala collection, you can write
val list = List(1,2,3,4,5)
val arr = Array[Int](list:_*)
println(arr.mkString)
But usually the toArray method is more handy:
val list = List(1,2,3,4,5)
val...