$f.toURI() :: $f instanceof java.io.File
=>
org.openide.util.Utilities.toURI($f)
;;

new java.io.File($u) :: $u instanceof java.net.URI
=>
org.openide.util.Utilities.toFile($u)
;;

new java.io.File($u.getPath()) :: $u instanceof java.net.URI
=>
<!warning='Unsafe File/URI conversion'>
;;

new java.io.File($u.getPath()) :: $u instanceof java.net.URL
=>
<!warning='Unsafe File/URL conversion'>
;;