March 2025
Intermediate to advanced
2016 pages
69h 59m
English
book
OCP Oracle Certified Professional Java SE 21 Developer (Exam 1Z0-830) Java SE 17 Developer (Exam 1Z0-829) Programmers Guide
by Khalid A. Mughal, Vasily A. Strelnikov
Content preview from OCP Oracle Certified Professional Java SE 21 Developer (Exam 1Z0-830) Java SE 17 Developer (Exam 1Z0-829) Programmers Guide
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Appendix B
Annotated Answers to Review Questions
1 Pattern Matching for Java Objects
1.1 (a), (c), and (d)
Note that the traditional switch construct with case constants is used in this question
Option (b) fails to compile because the switch actions should be enclosed in a block when there is more than one statement in the switch action.
Option (e) fails to compile because it is implemented as a switch expression which must be exhaustive and that is not the case.
Option (f) fails to compile because it attempts to use both the colon (:) and the arrow (->) notations in the same switch block, which is not allowed.
1.2 (a)
Reference x is a static field that references a Dog object. The instanceof pattern match operator returns true. The pattern ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.