Hi Annamaria Joseph,
First of all, a warm welcome to CodeRanch!
Annamaria Joseph wrote:What is the difference between Java SE 6 Programmer and Java SE 8 Programmer ?
I would say the difference is 2
No, seriously now. Since Java 7, Oracle has split the certification in 2 parts: the OCA one is the entry-level exam and covers java and OO basics. The OCP is the more advanced exam and covers a lot of advanced topics (generics, threads, concurrency,
jdbc, file i/o, nio2.0,...). So OCPJP6 covers Java & OO basics together with a bunch of advanced topics (generics, threading, concurrency, inner classes,...).
The OCAJP8 exam covers Java & OO basics, including some new language features like a few classes of the new Date & Time API and lambda expressions. You'll find all exam objectives
here. To get on the same level as an OCPJP6 certified developer you'll need to pass the advanced OCPJP8 exam as well. This exam covers besides the advanced topics of OCPJP6 also JDBC, NIO2.0, resource bundles, and of course the new language features of Java 8 like streams and lambdas.
Hope it helps!
Kind regards,
Roel