[SNMP4J] snmp + Trap

[sanjay A]

Hi everybody
I am new to snmp.
But with snmp4j package I have written a snmpGet,snmpGetNext, snmpwalk
programs successfully.
I want to write atrap program wich receive a trap from a network device in
my network.
I also check some code from the mailling list, but I can't do that
successfully.
So anybody plz clear my doubt, how to write a trap, and
what are the steps to receive any trap.