If fact, I have downloaded SNMP4j libs, but the problem is I cannot realize how to use them exactly! and what I exactly need to know to use them.

I mean, there is no clear-cut example  to use this libs in the net (or, I cannot find it so far) and as I am new in SNMP, I have no clue to write an SNMP "hello world" in java.

meanwhile, I saw the link already, There an example there but it is self-contained instead of using SNMP4j.