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At runtime, find all classes in a Java application that extend a base class
...the ServiceLoader mechanism.
Also many people roll their own by having a file in a well known classpath location (i.e. /META-INF/services/myplugin.properties) and then using ClassLoader.getResources() to enumerate all files with this name from all jars. This allows each jar to export its own provi...
Resetting remote to a certain commit
...
If you want a previous version of file, I would recommend using git checkout.
git checkout <commit-hash>
Doing this will send you back in time, it does not affect the current state of your project, you can come to mainline
git checkout mainline
...
How to have the formatter wrap code with IntelliJ?
...
The "Ensure right margin is not exceeded" option is in File / Settings / Editor / Code Style / Java / Wrapping and Braces / Keep when reformatting
– Aaron
Jan 3 '16 at 8:11
...
Create Directory if it doesn't exist with Ruby
... nested directories. Assuming foo does not exist, you will receive no such file or directory error for:
Dir.mkdir 'foo/bar'
# => Errno::ENOENT: No such file or directory - 'foo/bar'
To create nested directories at once, FileUtils is needed:
require 'fileutils'
FileUtils.mkdir_p 'foo/bar'
# =&...
Save image from URL by paperclip
...ay:
require "open-uri"
class User < ActiveRecord::Base
has_attached_file :picture
def picture_from_url(url)
self.picture = open(url)
end
end
Then simply :
user.picture_from_url "http://www.google.com/images/logos/ps_logo2.png"
...
What does cmd /C mean? [closed]
...ry (see below)
/A Causes the output of internal commands to a pipe or file to be ANSI
/U Causes the output of internal commands to a pipe or file to be
Unicode
/T:fg Sets the foreground/background colors (see COLOR /? for more info)
/E:ON Enable command extensions (see below)
/...
Best C++ Code Formatter/Beautifier
...an be configured with a variety of options listed here.
When using config files (named .clang-format) styles can be per directory - the closest such file in parent directories shall be used for a particular file.
Styles can be inherited from a preset (say LLVM or Google) and can later override dif...