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Java 9: Building Robust Modular Applications
book

Java 9: Building Robust Modular Applications

by Dr. Edward Lavieri, Peter Verhas, Jason Lee
April 2018
Intermediate to advanced content levelIntermediate to advanced
910 pages
33h 21m
English
Packt Publishing
Content preview from Java 9: Building Robust Modular Applications

Value types

The goal of this effort is to update the Java Virtual Machine, and, if possible, the Java language, to support small, immutable, identity-less value types. Currently, if you instantiate a new Object, it is given an identifier by the JVM, which allows the variable instance to be referenced.

For example, if you create a new integer, new Integer(42), a variable with the identity of java.lang.Integer@68f29546, but the value of 42, the value of this variable will never change, and that's all we, as developers, typically care about. However, the JVM doesn't really know that, so it has to maintain the identity of the variable, with all of the overhead that entails. According to Goetz, that means every instance of this object will require ...

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Publisher Resources

ISBN: 9781788832823Supplemental ContentOtherPurchase LinkErrata Page