Based on the OPS document, OPS distributes the client connections across the cluster, that is, directs the client request to the least loaded node to process the database connection. My question is :

How to access the OPS connection? Do I need to specify one particular node to connect to? For example, if I use JDBC to make connection, I may use the code like:
Connection conn = DriverManager.getConnection("jdbcracle:thin@::", "user", "pass");
Which node should I use as :: ?

Thanks for any help.