PosixFilePermissions.fromString(String perms) has the following syntax.
public static Set < PosixFilePermission > fromString(String perms)
In the following code shows how to use PosixFilePermissions.fromString(String perms) method.
import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.attribute.FileAttribute; import java.nio.file.attribute.PosixFileAttributeView; import java.nio.file.attribute.PosixFileAttributes; import java.nio.file.attribute.PosixFilePermission; import java.nio.file.attribute.PosixFilePermissions; import java.util.Set; /*from w w w . jav a 2 s . co m*/ public class Main { public static void main(String[] args) throws Exception { Path path = Paths.get("c:/home/tutorial/Java/JavaFX/Topic.txt"); Path new_path = Paths.get("/home/tutorial/Java/JavaFX/new_Topic.txt"); //use of fromString Set<PosixFilePermission> permissions = PosixFilePermissions.fromString("rw-r--r--"); try { Files.setPosixFilePermissions(new_path, permissions); } catch (IOException e) { System.err.println(e); } } }