Java list directory contents how to#
Java list directory contents code#

Libraries that document the public interface in the README are so easy to use. Learn the basic examples and then answer your specific questions by searching the README with Command + F. You donвЂ™t need to study the library extensively to start using it. LiвЂ™s Hands on Scala Programming book has an entire chapter dedicated to this library and covers it in much more detail. You can depend on os-lib without worrying that itвЂ™ll become a maintenance burden. itвЂ™s cross compiled with Scala 2.12 and 2.13.import interface is clean (well, non-existent for this lib).

Java list directory contents code#

itвЂ™s intuitive and you can answer your own questions by searching the README (you donвЂ™t need to read source code or ask Stackoverflow).

it provides a Ruby-like, clean public interface.

This library provides several good examples for the Scala community: This library is a good example for the Scala community You need to use os.remove.all(os.pwd/'dogs'). You canвЂ™t delete the dogs directory with os.remove(os.pwd/'dogs') because it contains files. You can recursively list a directory and find the largest nested file for example. These file listing capabilities allow for idiomatic Scala file processing. Users/powers/Documents/code/my_apps/scala-design/dogs/dog3.txt Users/powers/Documents/code/my_apps/scala-design/dogs/dog2.txt, Users/powers/Documents/code/my_apps/scala-design/dogs/dog1.txt, Os.list(os.pwd/'dogs') returns a listing of the files as an ArraySeq: ArraySeq( Os.write(os.pwd/'dogs'/'dog1.txt', 'ruff ruff') LetвЂ™s create a folder with a few files and then list the folder contents. Os.remove can also be used to delete empty folders: os.remove(os.pwd/'my_folder') File listing LetвЂ™s delete the story.txt file: os.remove(os.pwd/'my_folder'/'story.txt') os.write(os.pwd/'my_folder'/'story.txt', 'once upon a time')

Now letвЂ™s add a story.txt file to the folder with some text. LetвЂ™s create a my_folder directory: os.makeDir(os.pwd/'my_folder') Libraries generally shouldnвЂ™t be exposed in this manner, but Li can get away with it рџ‰ Creating a folder and file You donвЂ™t need to add any additional imports when using the library, so it feels like itвЂ™s a native Scala package. You can add libraryDependencies += 'com.lihaoyi' %% 'os-lib' % '0.7.1' to your build.sbt files and the os object is automatically available. The os-lib API is exposed via the os object. Want to build a wonderful Scala graph library? Email me and letвЂ™s build NetworkX for Scala. Li has a history of porting good Python libraries to Scala. Ruby is know for having a great filesystem API and itвЂ™s a great accomplishment for a Scala library to provide such an elegant user interface. The os-lib solution is similar to how you can copy a file in Ruby: require 'fileutils'Дir.pwd + '/src/test/resources/people.csv',

The path / filesystem operations are both packed into os-lib, so you donвЂ™t need to mess around with different packages.

Java list directory contents how to#

YouвЂ™ll need learn how to handle Java paths and investigate if the blocking / non-blocking APIs are better for your application. The Java libraries also require some yak-shaving research. You usually just want to copy a file and donвЂ™t care about low level details. The Java libraries require a bunch of imports and low level library understanding. Implicit def toPath (filename: String) = get(filename) ThereвЂ™s another answer that uses java.nio: import .REPLACE_EXISTING New FileInputStream(src) getChannel, 0, Long.MaxValue ) New FileOutputStream(dest) getChannel() transferFrom( The top ranked answer uses java.io: import java.io. HereвЂ™s the top ranked Stackoverflow answer when you Google вЂњcopy file ScalaвЂќ. HereвЂ™s how to copy src/test/resources/people.csv into the tmp directory with os-lib: os.copy( Suppose youвЂ™re working in an SBT project with a people.csv file in this directory structure: src/ Scala developers no longer need to mess around with low level Java libraries for basic filesystem operations. Li thankfully created an os-lib project that makes Scala filesystem operations easy and intuitive. Basic filesystem operations have traditionally been complex in Scala.ДЄ simple operation like copying a file is a one-liner in some languages like Ruby, but a multi-line / multi-import mess if you rely on Java libraries.