Java Language Tutorial => Retrieving information using the filesystem

Example

To interact with the filesystem you use the methods of the class Files.

To check the existence of the file or directory a path points to, you use the following methods:

Files.exists(Path path)

and

Files.notExists(Path path)

!Files.exists(path) does not neccesarily have to be equal to Files.notExists(path), because there are three possible scenarios:

A file's or directory's existence is verified (exists returns true and notExists returns false in this case)
A file's or directory's nonexistence is verfied (exists returns false and notExists returns true)
Neither the existence nor the nonexistence of a file or a directory can be verified (for example due to access restrictions): Both exists and nonExists return false.

This is done using Files.isDirectory(Path path) and Files.isRegularFile(Path path)

Path p1 = Paths.get("/var/www");
Path p2 = Paths.get("/home/testuser/File.txt");

Files.isDirectory(p1) == true
Files.isRegularFile(p1) == false

Files.isDirectory(p2) == false
Files.isRegularFile(p2) == true

This can be done using the following methods:

Files.isReadable(Path path)
Files.isWritable(Path path)
Files.isExecutable(Path path)

Files.isHidden(Path path)
Files.isSymbolicLink(Path path)

Files.probeContentType(Path path)

This tries to get the MIME type of a file. It returns a MIME type String, like this:

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