What's the difference between
Consider these filenames:
C:\temp\file.txt - This is a path, an absolute path, and a canonical path.
.\file.txt - This is a path. It's neither an absolute path nor a canonical path.
C:\temp\myapp\bin\..\\..\file.txt - This is a path and an absolute path. It's not a canonical path.
A canonical path is always an absolute path.
Converting from a path to a canonical path makes it absolute (usually tack on the current working directory so e.g.
c:/temp/file.txt). The canonical path of a file just "purifies" the path, removing and resolving stuff like
..\ and resolving symlinks (on unixes).
Also note the following example with nio.Paths:
String canonical_path_string = "C:\\Windows\\System32\\"; String absolute_path_string = "C:\\Windows\\System32\\drivers\\..\\"; System.out.println(Paths.get(canonical_path_string).getParent()); System.out.println(Paths.get(absolute_path_string).getParent());
While both paths refer to the same location, the output will be quite different: