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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3.1.5Erweiterungen rund um die Klasse Optional<T>
Die Klasse java.util.Optional<T> wurde mit Java 8 eingeführt und erleichtert die Behandlung und Modellierung optionaler Werte, wie dies oft für Suchen oder den Spezialfall der Berechnung von Minimal- oder Maximalwerten leerer Ergebnismengen der Fall ist. Im Praxiseinsatz der Klasse Optional<T> war jedoch bislang noch die eine oder andere Schwachstelle festzustellen. Insbesondere betrifft dies folgende Aufgabenstellungen:
- 1. Das Ausführen von Aktionen auch im Negativfall.
- 2. Die Umwandlung in einen Stream<T>, um Daten weiterzuverarbeiten oder eine Kompatibilität mit dem Stream-API z. B. für Frameworks, die auf Streams arbeiten, herzustellen.
- 3. Die Verknüpfung der Resultate mehrerer Berechnungen, ...
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