March 2019
Intermediate to advanced
242 pages
6h 21m
English
Content preview from Java 11 and 12 – New Features
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The journey of getting there
Using an underscore to mark unused parameters required changes in the Java language.
Until Java 8, the underscore was used as a valid identifier. The first step was to deny permission to use an underscore as a regular identifier. So, Java 8 issued a compiler warning for the usage of _ as the name of formal parameters in lambdas. This was simple, and had no backward-compatibility issues since lambdas were introduced in Java 8. Moving forward, Java 9 replaced the compiler warning message with compilation errors for using underscores as parameter names.
With JEP 302, developers can use _ to mark an unused method parameter for the following:
- Lambdas
- Methods
- Catch handlers
In the next section, you'll see how (in ...
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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.