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

Product type Paperback

Published in Mar 2017

Last Updated in Feb 2025

Publisher Packt

ISBN-13 9781787282841

Length 408 pages

Edition 1st Edition

Languages

Java

Concepts

Object Oriented Programming

Author (1):

Gaston C. Hillar

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Table of Contents (16) Chapters

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...