In conversation with Campbell I had mentioned four areas I care about as part of Core
Java that aren't on the OCJP, so I am paying a bit less attention to them while the exam is in scope for me.
I mentioned:
1. BigDecimal/BigInteger which came up today in this forum and reminded me to write this post.
2. Regex, very important in real life, often the best way to do interview problems, not in scope for the OCJP except maybe in .split()
3. Reflection, I think very important in Real Life, almost out of scope for the OCJP (they do use class literals for multiply-applied annotations, but nothing else from Reflection).
4. LocalDate/LocalTime I occasionally still see Date on mock exams, but not in any way that we see or are tested on the nasty details, these were on the Java 8 certs, but not the 11. Still, don't leave home without 'em.
No action item here, they just came up as important stuff I am semi-ignoring in favor of stuff in scope for the exam, so I tend to be quiet about them...