September 2021
Intermediate to advanced
424 pages
9h 18m
German
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6Collections
In Java dienen Listen, Mengen und Schlüssel-Wert-Abbildungen zur Verwaltung von anderen Objekten. Das wird durch sogenannte Containerklassen realisiert. Die Containerklassen speichern Objekte.1 Somit ist die Verarbeitung primitiver Typen dort nur möglich, wenn diese in ein Wrapper-Objekt (wie Byte, Integer oder Double) umgewandelt werden. Wrapper-Objekte lernen wir später in Kapitel 7 kennen.
6.1Schnelleinstieg
6.1.1Die Klasse ArrayList
Die ArrayList kann man sich wie ein größenveränderliches Array vorstellen, das darüber hinaus diverse Funktionalitäten als Methoden anbietet. Dadurch lässt sich eine dynamische Befüllung oder Zusammensetzung abbilden.
Liste erzeugen
Als Beispiel definieren wir eine leere Liste zur Speicherung von ...
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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.