Hi!
Rahul mir and Enkita mody, thanks for the help!
When I posted this question on the "Beginning Java" forum in the "Learning on your own" topic, I
got a satisfying reply that for
Java SE's 6 version, there is the
OCPJP exam,
but some people call it 'OCJP' just because it is easier to speak, but it created confusion for me

, which is now cleared.