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Java 9 with JShell

You're reading from   Java 9 with JShell Introducing the full range of Java 9's new features via JShell

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781787282841
Length 408 pages
Edition 1st Edition
Languages
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Author (1):
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Gaston C. Hillar Gaston C. Hillar
Author Profile Icon Gaston C. Hillar
Gaston C. Hillar
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Table of Contents (16) Chapters Close

Preface 1. JShell – A Read-Evaluate-Print-Loop for Java 9 FREE CHAPTER 2. Real-World Objects to UML Diagrams and Java 9 via JShell 3. Classes and Instances 4. Encapsulation of Data 5. Mutable and Immutable Classes 6. Inheritance, Abstraction, Extension, and Specialization 7. Members Inheritance and Polymorphism 8. Contract Programming with Interfaces 9. Advanced Contract Programming with Interfaces 10. Maximization of Code Reuse with Generics 11. Advanced Generics 12. Object-Oriented, Functional Programming, and Lambda Expressions 13. Modularity in Java 9 A. Exercise Answers Index

Understanding how interfaces work in combination with classes


Let's imagine we have to develop a Web Service in which we have to work with two different types of character: comic and game characters.

A comic character must be drawable in a comic strip. A comic character must be able to provide a nickname and perform the following tasks:

  • Draw a speech balloon, also known as speech bubble, with a message

  • Draw a thought balloon, also known as thought bubble, with a message

  • Draw a speech balloon with a message and another comic character, drawable in a comic strip, as a destination

A game character must be drawable in a game scene. A game character must be able to provide a full name and its current score. In addition, a game character must be able to perform the following tasks:

  • Set its desired location to a specific 2D position indicated by the x and y coordinates

  • Provide the value for its x coordinate

  • Provide the value for its y coordinate

  • Draw itself at its current position

  • Check whether it intersects...

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