大约有 15,510 项符合查询结果（耗时：0.0235秒） [XML]
How can I initialise a static Map?
... can create an immutable map using a static initialiser too:
public class Test {
private static final Map<Integer, String> myMap;
static {
Map<Integer, String> aMap = ....;
aMap.put(1, "one");
aMap.put(2, "two");
myMap = Collections.unmodifiableMa...
How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?
...:
# "x86" when using 32-bit JVM
# "amd64" when using 64-bit JVM
This was tested against both SUN and IBM JVM (32 and 64-bit). Clearly, the system property is not just the operating system arch.
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How to pass arguments into a Rake task with environment in Rails? [duplicate]
... can require the environment using the :needs option. For example:
desc "Testing environment and variables"
task :hello, :message, :needs => :environment do |t, args|
args.with_defaults(:message => "Thanks for logging on")
puts "Hello #{User.first.name}. #{args.message}"
end
Updated pe...
pandas GroupBy columns with NaN (missing) values
...3),
[1] * (2 * 3)]
col_names = ['col_a', 'col_b', 'value']
test_df = pd.DataFrame(data_block, index=col_names).T
grouped_df = safe_groupby(test_df, ['col_a', 'col_b'],
OrderedDict([('value', 'sum')]))
This will return the successful result without having ...
What is the best Battleship AI?
...coin. I needed to do 1000 games to get any reasonable distinction between test algorithms.
Download Dreadnought 1.2.
Strategies:
keep track of all possible positions for ships that have >0 hits. The list never gets bigger than ~30K so it can be kept exactly, unlike the list of all possible ...
How to automate createsuperuser on django?
... user.save()
Example use:
./manage.py createsuperuser2 --username test1 --password 123321 --noinput --email 'blank@email.com'
This has the advantage of still supporting the default command use, while also allowing non-interactive use for specifying a password.
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Calculating Distance between two Latitude and Longitude GeoCoordinates
I'm calculating the distance between two GeoCoordinates. I'm testing my app against 3-4 other apps. When I'm calculating distance, I tend to get an average of 3.3 miles for my calculation whereas other apps are getting 3.5 miles. It's a big difference for the calculation I'm trying to perform. Are t...
Add icon to submit button in twitter bootstrap 2
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I have tested this in Chrome, Firefox, Safari (on win7) and IE8 inside a <form> tag as a submit button successfully
– Mr Bell
Mar 14 '12 at 21:54
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How to effectively work with multiple files in Vim
... from the args list:
:argdelete
In your example, you could use :argedit test.pl to add test.pl to the args list and edit the file in one step.
:help args gives much more detail and advanced usage
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Sqlite LIMIT / OFFSET query
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I made some tests and there is no difference in performance.
That is only for compatability with other sql languages.
Running time of both versions is same.
I made sqlite db with table1 with 100000 rows. I run next test
long timeLimi...