November 2023
Intermediate to advanced
382 pages
6h 28m
German
Content preview from Java lernen – kurz & gutBecome 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,
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.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.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.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.
6Collections
In Java sind Listen, Mengen und Schlüssel-Wert-Abbildungen zur Verwaltung von anderen Objekten1 durch sogenannte Containerklassen realisiert. Somit ist die Verarbeitung primitiver Typen, also int, float usw., dort nur möglich, wenn diese in ein korrespondierendes Wrapper-Objekt (wie Integer oder Float) umgewandelt werden, das Werte der primitiven Typen verwalten kann. Details dazu finden Sie in Abschnitt 7.2.
6.1Schnelleinstieg
Bevor wir uns mit den wichtigsten Containerklassen beschäftigen, sei eingangs erwähnt, dass es zwei sogenannte Utility-Klassen, also nützliche Klassen mit Hilfsfunktionen, gibt, nämlich java.util.Collections und java.util.Arrays.
6.1.1Die Klasse ArrayList
Sollen mehrere Werte, etwa Namen, Städte, Aufgaben, ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.