nio - Does java FileChannnel.transferTo() work cleverly when files are on network? -

http://docs.oracle.com/javase/7/docs/api/java/nio/channels/filechannel.html

says

bytes can transferred file other channel, , vice versa, in way can optimized many operating systems fast transfer directly or filesystem cache.

if both files locally on computer can understand how works.

but if files on same network drive same apply or not ?

what mean bytes in file2 have transferred local computer first in order written second file, on slow network connection seem outweigh advantages of bypassing java heap. or can os ' transfer x bytes file 1 file 2 , because on same drive actual bytes dont have transferred on network instruction transfer'