Hi Suruchi,
The simple answer is that you don't use JCO to connect to HANA, as HANA does not expose RFC's, HANA is (first and foremost) an SQL database (and so much more). So what you need to connect to it from java is a JDBC driver (google jdbc to find out more). And of course SAP makes a JDBC driver for HANA available for customer, partners and java developers - you find it as part of the SAP HANA Client package on Service Marketplace (or for development purposes only here on the hana developer center front page).
Cheers
--Juergen
PS: of course, if you run your business suite system on HANA, you can use JCO to access all BAPIs etc just like before - but you're not talking directly to HANA then, you are talking to an ABAP server that runs on HANA - so I assume this is not your scenario...