Book Image

Java 9 with JShell

By : Gaston C. Hillar
Book Image

Java 9 with JShell

By: Gaston C. Hillar

Overview of this book

The release of Java 9 has brought many subtle and not-so-subtle changes to the way in which Java programmers approach their code. The most important ones are definitely the availability of a REPL, known as JShell, which will make experiments and prototyping much more straightforward than the old IDE-based project-led approach. Another, more subtle change can be seen in the module system, which will lead to more modularized, maintainable code. The techniques to take full advantage of object-oriented code, functional programming and the new modularity features in Java 9 form the main subjects of this book. Each chapter will add to the full picture of Java 9 programming starting out with classes and instances and ending with generics and modularity in Java.
Table of Contents (23 chapters)
Java 9 with JShell
Credits
About the Author
Acknowledgement
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Test your knowledge


  1. A functional interface is an interface that meets the following condition:

    1. It uses a lambda expression in one of its default methods.

    2. It has a single abstract method or a single method requirement.

    3. It implements the Lambda<T, U> interface.

  2. You can create an instance of a functional interface with:

    1. Lambda expressions, method references, or constructor references.

    2. Only lambda expressions. Method references and constructor references only work with Predicate<T>.

    3. Method references and constructor references. Lambda expressions only work with Predicate<T>.

  3. The IntPredicate functional interface represents a function with:

    1. One argument of the int type that returns no result (void).

    2. One argument of the int type that returns an Integer result.

    3. One argument of the int type that returns a boolean result.

  4. When we apply a filter method to a Stream<T>, the method returns:

    1. A Stream<T>.

    2. A List<T>.

    3. A Map<T, List<T>>.

  5. Which of the following code snippets...