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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

REPL

One change that seems to excite a lot of people isn't a language change at all. It's the addition of a REPL (Read-Eval-Print-Loop), a fancy term for a language shell. In fact, the command for this new tool is jshell. This tool allows us to type or paste in Java code and get immediate feedback. For example, if we wanted to experiment with the Streams API discussed in the preceding section, we could do something like this:

$ jshell | Welcome to JShell -- Version 9-ea | For an introduction type: /help intro jshell> List<String> names = Arrays.asList(new String[]{"Tom", "Bill", "Xavier", "Sarah", "Adam"}); names ==> [Tom, Bill, Xavier, Sarah, Adam] jshell> names.stream().sorted().forEach(System.out::println); Adam Bill Sarah Tom Xavier  ...
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Publisher Resources

ISBN: 9781788832823Supplemental ContentOtherPurchase LinkErrata Page