April 2020
Intermediate to advanced
370 pages
8h 37m
German
Content preview from Java – die Neuerungen in Version 9 bis 14Become 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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2Syntaxerweiterungen in JDK 9 bis 11
In JDK 9 finden sich verschiedene kleinere Syntaxerweiterungen, die wir uns hier anschauen. Außerdem lernen wir mit var die sogenannte Local Variable Type Inference als Syntaxerweiterung in Java 10 kennen, die mit Java 11 leicht erweitert wurde.
2.1Anonyme innere Klassen und der Diamond Operator
Bei der Definition anonymer innerer Klassen konnte man den Diamond Operator bis JDK 8 leider nicht nutzen, sondern der Typ aus der Deklaration war auch bei der Definition explizit anzugeben. Praktischerweise ist es mit JDK 9 (endlich) möglich, auf diese redundante Typangabe zu verzichten. Als Beispiel dient die Definition eines Komparators mit dem Interface java.util.Comparator<T>.
Beispiel mit JDK 8
Bis JDK 8 musste ...
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