NIO 2 File API

External

• https://gquintana.github.io/2017/09/02/Java-File-vs-Path.html
• https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/Files.html
• https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/Paths.html

Internal

• NIO Concepts

Subjects

• Java Temporary Files and Directories
• Java Recursively Delete a Directory

Recipes

Build a new absolute Path instances from components:

Path p = Paths.get("/Users", "ovidiu", "tmp")

Build a new relative Path instances from components:

Path p = Paths.get("ovidiu", "tmp")

Create one directory:

Path parent = ...;
Path dir = Files.createDirectory(Paths.get(parent.toString(), "my-dir"));

Create a directory hierarchy:

Path parent = ...;
Path dir = Files.createDirectories(Paths.get(parent.toString(), "dir1/dir2/dir3"));

Get file name:

Path file = ...;
String fileName = file.getFileName().toString();

Create a file with a specified content:

Path file = ...;
Files.write(file, "something".getBytes());

Verify that a directory exists (works for both absolute and relative paths)

Path p = Paths.get("/Users/ovidiu/tmp");
assert Files.isDirectory(p) == true
// run from "/Users"
Path p = Paths.get("ovidiu/tmp");
assert Files.isDirectory(p) == true

Get current directory:

new File(".").toPath().toAbsolutePath().toString()