DatagramChannel.send

send

public abstract int send (ByteBuffer  src, SocketAddress  target) throws IOException

non-blocking mode

and

there is sufficient room in the underlying output buffer

 

or

 

blocking mode

and

sufficient room becomes available

 

then the remaining bytes in the given buffer are transmitted as a single datagram to the given target address.

Returns: The number of bytes sent, which will be either the number of bytes that were remaining in the source buffer when this method was invoked or, if this channel is non-blocking, may be zero if there was insufficient room for the datagram in the underlying output buffer