Basic Sockets - TCP/IP Sockets in Java Practical Guide for Programmers - page 25

remoteAddr Address (typically destination) of the datagram

remotePort Port (typically destination) of the datagram

Accessors/Mutators

InetAddress getAddress ()
void setAddress ( InetAddress address )
Returns/sets the datagram address. There are other ways to set the address: 1) the
address of a DatagramPacket instance can also be set by the constructor, and 2)
the receive() method of DatagramSocket sets the address to the datagram sender's
address.
address Datagram address

int getPort ()
void setPort ( int port )
Returns/sets the datagram port. There are other ways to set the address: 1) the port
can be explicitly set by the constructor or the setPort() method, and 2) the receive()
method of DatagramSocket sets the port to the datagram sender's port.
port Datagram port

int getLength ()
void setLength ( int length )
Returns/sets the internal length of the datagram. The internal datagram length can be
set explicitly by the constructor or by the setLength() method. Attempting to make it
larger than the length of the associated buffer results in an IllegalArgumentException .
The receive() method of DatagramSocket uses the internal length in two ways: 1) on
input, it specifies the maximum number of bytes of a received message that will be
copied into the buffer, and 2) on return, it indicates the number of bytes actually placed
in the buffer.
length Length in bytes of the usable portion of the buffer

int getOffset ()
Returns the location in the buffer of the first byte of data to be sent/received. There
is no setOffset() method; however, it can be set with setData() .

byte[ ] getData ()
Returns the buffer associated with the datagram. The returned object is a reference
to the byte array that was most recently associated with this DatagramPacket , either
by the constructor or by setData() . The length of the returned buffer may be greater
than the internal datagram length, so the internal length and offset values should be
used to determine the actual received data.