November 2024
Intermediate to advanced
638 pages
16h 24m
French
Content preview from Livre de cuisine Java, 4e édition
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Chapitre 2. Interagir avec l'environnement
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2.0 Introduction
Ce chapitre décrit comment ton programme Java peut traiter avec son environnement immédiat avec ce que nous appelons l'environnement d'exécution. Dans un sens, tout ce que tu fais dans un programme Java en utilisant presque n'importe quelle API Java implique l'environnement. Ici, nous nous concentrons plus étroitement sur les choses qui entourent directement ton programme. En cours de route, nous ferons connaissance avec la classe System , qui en sait beaucoup sur ton système particulier.
Deux autres classes d'exécution méritent d'être mentionnées brièvement. La première, java.lang.Runtime , est à l'origine de nombreuses méthodes de la classe System. System.exit() Le programme d'exécution, par exemple, appelle simplement Runtime.exit() . Runtime
fait techniquement partie de l'environnement, mais la seule fois où nous l'utilisons directement, c'est pour exécuter d'autres programmes, ce qui est abordé dans larecette 18.1.
2.1 Obtenir des variables d'environnement
Problème
Tu veux obtenir la valeur des variables d'environnement à partir de ton programme Java.
Solution
Utilise System.getenv().
Discussion
La septième édition d'Unix, publiée en 1979, comportait une nouvelle fonctionnalité connue sous le nom de variables d'environnement. Les variables d'environnement se trouvent dans tous ...
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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.