April 2019
Intermediate to advanced
344 pages
8h 4m
German
Content preview from Java – die Neuerungen in Version 9 bis 12Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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10.3Sichtbarkeiten und Zugriffsschutz
Die Themen Sichtbarkeit und Zugriffsschutz wurden zuvor nicht explizit thematisiert, sondern eher am Rande besprochen. Beiden Themen wollen wir uns nun widmen.
10.3.1Sichtbarkeiten
Eingangs nannte ich als eines der Ziele bei der Modularisierung eine bessere Steuerung von Abhängigkeiten und Sichtbarkeiten. Die bisherigen Beispiele haben gezeigt, dass in Java 9 die Sichtbarkeiten strenger als in Java 8 geprüft werden.
Sichtbarkeiten in JDK 8
Rekapitulieren wir zunächst den Status quo in Java 8: Bekanntermaßen besaßen Typen damals eine der folgenden vier Sichtbarkeiten:
- private – Nur in der eigenen Klasse sichtbar
- default / package private (kein Schlüsselwort) – Nur im eigenen Package sichtbar
- protected – Wie ...
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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.