connectivity to the existing Oracle DB through JDBC

We want help on Facilitating connectivity to the existing Oracle DB through JDBC,

User want to connect and extract the oracle data base data through the JDBC. If it is possible .Weather it is possible how to approach. Please share the useful documents if it is possible.

The existing Oracle DB (11.2.0.3.0 )version is installed in Linux machine (Red Hat Enterprise Linux server release 6.6(santiago))