April 2017
Beginner
504 pages
14h 11m
English
Content preview from Java 9 Programming By Example
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Annotations
Annotations are used with the @ character in front of them and can be attached to packages, classes, interfaces, fields, methods, method parameters, generic type declaration and use, and, finally, to annotations. Annotations can be used almost everywhere and they are used to describe some program meta information. For example, the @RestController annotation does not directly alter the behavior of the OrderController class. The behavior of the class is described by the Java code that is inside. The annotation helps Spring to understand what the class is and how it can and should be used. When Spring scans all the packages and classes to discover the different Spring beans, it sees the annotation on the class and takes it into account. ...
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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.