October 2014
Beginner to intermediate
418 pages
11h 30m
English
Content preview from Java in a Nutshell, 6th Edition
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Chapter 12. Nashorn
With Java 8, Oracle has included Nashorn, a new JavaScript implementation that runs on the JVM. Nashorn is designed to replace the original JavaScript-on-the-JVM project—which was called Rhino (Nashorn is the German word for “rhino”).
Nashorn is a completely rewritten implementation and strives for easy interoperability with Java, high performance, and precise conformance to the JavaScript ECMA specifications. Nashorn was the first implementation of JavaScript to hit a perfect 100% on spec compliance and is already at least 20 times faster than Rhino on most workloads.
Introduction to Nashorn
In this chapter, we will assume some basic understanding of JavaScript. If you aren’t already familiar with basic JavaScript concepts, then Head First JavaScript by Michael Morrison (O’Reilly) is a good place to start.
If you recall the differences between Java and JavaScript outlined in “Java Compared to JavaScript”, you know that we can see that the two languages are very different. It may, therefore, seem surprising that JavaScript should be able to run on top of the same virtual machine as Java.
Non-Java Languages on the JVM
In fact, there are a very large number of non-Java languages that run on the JVM—and some of them are a lot more unlike Java than JavaScript is. This is made possible by the fact that the Java language and JVM are only very loosely coupled, and only really interact via the definition of the class file format. This can be accomplished in two different ...
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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.