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Mastering Java 11

You're reading from   Mastering Java 11 Develop modular and secure Java applications using concurrency and advanced JDK libraries

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789137613
Length 462 pages
Edition 2nd Edition
Languages
Tools
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Authors (2):
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Dr. Edward Lavieri Jr. Dr. Edward Lavieri Jr.
Author Profile Icon Dr. Edward Lavieri Jr.
Dr. Edward Lavieri Jr.
Mandar Jog Mandar Jog
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Mandar Jog
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Toc

Table of Contents (20) Chapters Close

Preface 1. The Java 11 Landscape FREE CHAPTER 2. Discovering Java 11 3. Java 11 Fundamentals 4. Building Modular Applications with Java 11 5. Migrating Applications to Java 11 6. Experimenting with the Java Shell 7. Leveraging the Default G1 Garbage Collector 8. Microbenchmarking Applications with JMH 9. Making Use of the Process API 10. Fine-Grained Stack Tracing 11. New Tools and Tool Enhancements 12. Concurrency Enhancements 13. Security Enhancements 14. Command-Line Flags 15. Additional Enhancements to the Java Platform 16. Future Directions 17. Contributing to the Java Platform 18. Assessment 19. Other Books You May Enjoy

Understanding JShell

JShell is an important tool that is relatively new to the Java platform. It was introduced with JDK 9. It is an interactive REPL tool that is used to evaluate the following Java programming language components—declarations, statements, and expressions. It has its own API so that it can be used by external applications.

Read-Eval-Print Loop is often referred to as REPL, taking the first letter from each word in the phrase. It is also known as a language shell or interactive top level.

The introduction of JShell was a result of JDK Enhancement Proposal (JEP) 222. Here are the stated goals of this JEP in regards to the Java Shell command-line tool:

  • Facilitates rapid investigation
  • Facilitates rapid coding
  • Provides an edit history

The rapid investigation and coding listed previously include statements and expressions. Impressively, these statements and...

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