March 2019
Intermediate to advanced
242 pages
6h 21m
English
Content preview from Java 11 and 12 – New Features
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Data classes and inheritance
Currently, the proposal is to drop the following inheritance cases:
- A data class extends a regular class
- A regular class extends a data class
- A data class extends another data class
Allowing for any of the preceding cases would violate the contract of a data class being a carrier of data. At present, the following restrictions are proposed for data classes and inheritance, with interfaces and abstract data classes:
- Non-abstract and abstract data classes can extend other abstract data classes
- An abstract or non-abstract data class can extend any interface
The following figure sums up these inheritance rules:
Let's get started by extending an abstract data class.
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.