July 2023
Intermediate to advanced
276 pages
6h 55m
English
Content preview from Functional Programming in Java, 2nd EditionBecome 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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Watching a File Change
We know how to look for files and directories, but if we want to sit back and get alerts when a file is created, modified, or deleted, that’s easy as well. Such a facility is useful for monitoring changes to special files like configuration files and system resources. Here we’ll explore the facility that’s been available since Java 7, the WatchService, to watch for file changes. Most of the features we’ll see here are from JDK 7 and the main improvement will be in the convenience of the internal iterator.
Let’s create an example to watch for file changes in the current directory. The Path class in the JDK can lead to an instance of the file system, which acts as a factory for the watch service. We can register with this ...
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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.
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.