question: private static void nioCopy ( FileOutputStream fos , FileInputStream fis ) throws IOException { FileChannel outChannel = fos . getChannel ( ) ; FileChannel inChannel = fis . getChannel ( ) ; long length = inChannel . size ( ) ; long offset = 0 ; while ( true ) { long remaining = length - offset ; long toTransfer = remaining < MAX_TRANSFER_SIZE ? remaining : MAX_TRANSFER_SIZE ; long transferredBytes = inChannel . transferTo ( offset , toTransfer , outChannel ) ; offset += transferredBytes ; length = inChannel . size ( ) ; if ( offset >= length ) { break ; } } }
target:  Copy a single file using NIO.