Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Java 9 with JShell
  • Table Of Contents Toc
Java 9 with JShell

Java 9 with JShell

By : Gaston C. Hillar
2 (2)
Buy this Book
close
close
Java 9 with JShell

Java 9 with JShell

2 (2)
By: Gaston C. Hillar
Buy this Book

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 (16 chapters)
close
close
close
Preface
Icon
Preface
Icon
What this book covers
Icon
What you need for this book
Icon
Who this book is for
Icon
Conventions
Icon
Reader feedback
Icon
Customer support
Lock Free Chapter
1
1. JShell – A Read-Evaluate-Print-Loop for Java 9
Icon
1. JShell – A Read-Evaluate-Print-Loop for Java 9
Icon
Getting ready for our journey toward OOP with Java 9
Icon
Installing the required software on Windows, macOS, or Linux
Icon
Running Java 9 code in JShell
Icon
Working with variables, methods, and sources
Icon
Editing the source code in our favorite external code editor
Icon
Loading source code
Icon
Test your knowledge
Icon
Summary
2
2. Real-World Objects to UML Diagrams and Java 9 via JShell
Icon
2. Real-World Objects to UML Diagrams and Java 9 via JShell
Icon
Identifying objects from applications requirements
Icon
Capturing real-world objects
Icon
Generating classes to create objects
Icon
Recognizing variables and constants
Icon
Identifying actions to create methods
Icon
Organizing classes with UML diagrams
Icon
Using feedback from domain experts
Icon
Test your knowledge
Icon
Summary
3
3. Classes and Instances
Icon
3. Classes and Instances
Icon
Understanding classes and instances in Java 9
Icon
Working with object initialization and its customization
Icon
Introducing garbage collection
Icon
Declaring classes
Icon
Customizing constructors and initialization
Icon
Understanding how garbage collection works
Icon
Creating instances of classes and understanding their scope
Icon
Exercises
Icon
Test your knowledge
Icon
Summary
4
4. Encapsulation of Data
chevron up
Icon
4. Encapsulation of Data
Icon
Understanding members composing a class
Icon
Declaring immutable fields
Icon
Working with setters and getters
Icon
Combining setters, getters, and fields
Icon
Transforming values with setters and getters
Icon
Using static fields to provide class-level values
Icon
Using static methods to provide overridable class-level values
Icon
Test your knowledge
Icon
Summary
5
5. Mutable and Immutable Classes
Icon
5. Mutable and Immutable Classes
Icon
Creating mutable classes in Java 9
Icon
Working with mutable objects in JShell
Icon
Building immutable classes in Java 9
Icon
Working with immutable objects in JShell
Icon
Understanding the differences between mutating and non-mutating objects
Icon
Learning the advantages of non-mutating objects when writing concurrent code
Icon
Working with instances of the immutable String class
Icon
Creating the immutable version of an existing mutable class
Icon
Test your knowledge
Icon
Summary
6
6. Inheritance, Abstraction, Extension, and Specialization
Icon
6. Inheritance, Abstraction, Extension, and Specialization
Icon
Creating class hierarchies to abstract and specialize behavior
Icon
Understanding inheritance
Icon
Creating an abstract base class
Icon
Declaring classes that inherit from another class
Icon
Overriding and overloading methods
Icon
Test your knowledge
Icon
Summary
7
7. Members Inheritance and Polymorphism
Icon
7. Members Inheritance and Polymorphism
Icon
Creating concrete classes that inherit from abstract superclasses
Icon
Understanding polymorphism
Icon
Controlling overridability of members in subclasses
Icon
Controlling subclassing of classes
Icon
Creating methods that work with instances of different subclasses
Icon
Test your knowledge
Icon
Summary
8
8. Contract Programming with Interfaces
Icon
8. Contract Programming with Interfaces
Icon
Understanding how interfaces work in combination with classes
Icon
Declaring interfaces
Icon
Declaring classes that implement interfaces
Icon
Taking advantage of the multiple inheritance of interfaces
Icon
Combining class inheritance and interfaces
Icon
Test your knowledge
Icon
Summary
9
9. Advanced Contract Programming with Interfaces
Icon
9. Advanced Contract Programming with Interfaces
Icon
Working with methods receiving interfaces as arguments
Icon
Downcasting with interfaces and classes
Icon
Treating instances of an interface type as a different subclass
Icon
Taking advantage of default methods in interfaces in Java 9
Icon
Test your knowledge
Icon
Summary
10
10. Maximization of Code Reuse with Generics
Icon
10. Maximization of Code Reuse with Generics
Icon
Understanding parametric polymorphism, Java 9 generics, and generic code
Icon
Declaring an interface to be used as a type constraint
Icon
Declaring a class that conforms to multiple interfaces
Icon
Declaring subclasses that inherit the implementation of interfaces
Icon
Creating exception classes
Icon
Declaring a class that works with a constrained generic type
Icon
Using a generic class for multiple compatible types
Icon
Test your knowledge
Icon
Summary
11
11. Advanced Generics
Icon
11. Advanced Generics
Icon
Creating a new interface to be used as a constraint for a second type parameter
Icon
Declaring two classes that implement an interface to work with two type parameters
Icon
Declaring a class that works with two constrained generic types
Icon
Creating instances of a generic class with two generic type parameters
Icon
Test your knowledge
Icon
Summary
12
12. Object-Oriented, Functional Programming, and Lambda Expressions
Icon
12. Object-Oriented, Functional Programming, and Lambda Expressions
Icon
Understanding functions and methods as first-class citizens
Icon
Working with functional interfaces and lambda expressions
Icon
Creating a functional version of array filtering
Icon
Creating a data repository with generics and interfaces
Icon
Filtering collections with complex conditions
Icon
Using a map operation to transform values
Icon
Combining a map operation with reduce
Icon
Chaining many operations with map and reduce
Icon
Working with different collectors
Icon
Test your knowledge
Icon
Summary
13
13. Modularity in Java 9
Icon
13. Modularity in Java 9
Icon
Refactoring existing code to take advantage of object-oriented programming
Icon
Organizing object-oriented code with the new modularity in Java 9
Icon
Creating modular source code
Icon
Compiling multiple modules with the Java 9 compiler
Icon
Run modularized code with Java 9
Icon
Test your knowledge
Icon
Summary
14
A. Exercise Answers
Icon
Chapter 1, JShell – A Read-Evaluate-Print-Loop for Java 9
Icon
Chapter 2, Real-World Objects to UML Diagrams and Java 9 via JShell
Icon
Chapter 3, Classes and Instances
Icon
Chapter 4, Encapsulation of Data
Icon
Chapter 5, Mutable and Immutable Classes
Icon
Chapter 6, Inheritance, Abstraction, Extension, and Specialization
Icon
Chapter 7, Members Inheritance and Polymorphism
Icon
Chapter 8, Contract Programming with Interfaces
Icon
Chapter 9, Advanced Contract Programming with Interfaces
Icon
Chapter 10, Maximization of Code Reuse with Generics
Icon
Chapter 11, Advanced Generics
Icon
Chapter 12, Object-Oriented, Functional Programming, and Lambda Expressions
Icon
Chapter 13, Modularity in Java 9
15
Index
Icon
Index

Declaring immutable fields

Pokemon Go is a location-based augmented-reality game in which players use the mobile device's GPS capability to locate, capture, train, and make virtual creatures fight. This game had great success and popularized location-based and augmented-reality gaming. After its great success, imagine that we have to develop a Web Service that will be consumed by a similar game that makes virtual creatures battle.

We have to move to the world of virtual creatures. We will definitely have a VirtualCreature base class. Each specific type of virtual creature with unique characteristics that can participate in battles will be a subclass of VirtualCreature.

All the virtual creatures will have a name and they will be born in a specific year. The age is going to be extremely important for their performance in battles. Thus, our base class will have the name and birthYear fields that all the subclasses will inherit.

When we design classes, we want to make sure that all the necessary...

Visually different images
CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
Java 9 with JShell
End of Section 4
Next Section
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist download Download options
font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon