Sybex:Java OCA/OCP Practice Tests Chapter 10: OCA Practice Exam question 54 mock answer explanation Mistake:
"Since this reduces the implied visibility of public" should be "Since this reduces the visibility of protected" because if you wrongly use private instead of protected at h1, h2 and h3 would COMPILE.
by alinvlad05
Confirmed and added to the errata crediting you. I also checked and the Java 11 (819) practice exam book has the same problem. So added it to the errata there as well.