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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

Capturing real-world objects

We could easily recognize objects from Pitstop's artwork. We understood that each pattern is composed of many 2D geometric shapes and we recognized the different shapes that she used in all the examples we analyzed. Now, let's focus on one of the core requirements for the Web Service, which is calculating the required amounts of acrylic paint to produce the artwork. We must take into account the following data for each 2D shape included in the pattern in order to calculate the required materials and the amount of acrylic paint to produce each shape:

  • The line color
  • The perimeter
  • The fill color
  • The area

It is possible to use a specific color for the line that draws the borders of each shape, and therefore, we have to calculate the perimeter to use it as one of the values that will allow us to estimate the amount of acrylic paint that the user must buy to paint the border of each 2D shape. Then, we have to calculate the area to use it as one of the values...

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