Book Image

Hands-On Object-Oriented Programming with Kotlin

By : Abid Khan, Igor Kucherenko
Book Image

Hands-On Object-Oriented Programming with Kotlin

By: Abid Khan, Igor Kucherenko

Overview of this book

Kotlin is an object-oriented programming language. The book is based on the latest version of Kotlin. The book provides you with a thorough understanding of programming concepts, object-oriented programming techniques, and design patterns. It includes numerous examples, explanation of concepts and keynotes. Where possible, examples and programming exercises are included. The main purpose of the book is to provide a comprehensive coverage of Kotlin features such as classes, data classes, and inheritance. It also provides a good understanding of design pattern and how Kotlin syntax works with object-oriented techniques. You will also gain familiarity with syntax in this book by writing labeled for loop and when as an expression. An introduction to the advanced concepts such as sealed classes and package level functions and coroutines is provided and we will also learn how these concepts can make the software development easy. Supported libraries for serialization, regular expression and testing are also covered in this book. By the end of the book, you would have learnt building robust and maintainable software with object oriented design patterns in Kotlin.

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Table of Contents (14 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Getting Started with Kotlin
Getting Started with Kotlin
Technical requirements
Introduction to Kotlin
Data types in Kotlin
Null safety, type casting, Pair, and Triple
Flow controls
Introduction to loops
What is a function?
Summary
Questions
Further reading
2
Introduction to Object-Oriented Programming
Introduction to Object-Oriented Programming
Technical requirements
Object-oriented programming?
Benefits of object-oriented programming
Classes in Kotlin
Properties – first-class citizens
Constructing a class with a constructor
What are data classes?
Classes and functions
Summary
Questions
Further reading
3
The Four Pillars of Object-Oriented Programming
The Four Pillars of Object-Oriented Programming
Technical requirements
Encapsulation
What is inheritance?
Abstraction
Interfaces
Overriding
Types of inheritance
Polymorphism
Summary
Questions
Further reading
4
Classes - Advanced Concepts
Classes - Advanced Concepts
Technical requirements
Sealed classes and enumeration
Objects and companion objects
Aggregation, composition, and nested classes
Class properties
Delegate properties
Built-in delegates
Summary
Questions
Further reading
5
Data Collection, Iterators, and Filters
Data Collection, Iterators, and Filters
Technical requirements
Range
Arrays
Lists in Kotlin
Filters and collection functions
Summary
Questions
Further reading
6
Object-Oriented Patterns in Kotlin
Object-Oriented Patterns in Kotlin
Technical requirements
What design patterns are and how they help
Types of design patterns
Creational patterns
Structural patterns
Behavioral patterns
Summary
7
Coroutines - a Lightweight Thread?
Coroutines - a Lightweight Thread?
Technical requirements
What are coroutines?
Coroutines and threads
Coroutine examples
Summary
8
Interoperability
Interoperability
Technical requirements
Calling Java code in Kotlin
Calling Kotlin code in Java
Summary
Questions
Further reading
9
Regular Expression and Serialization in Kotlin
Regular Expression and Serialization in Kotlin
Technical requirements
Introducing regular expression
Kotlin and regular expression
Introducing serialization
Serialization and Kotlin support
Summary
10
Exception Handling
Exception Handling
Technical requirements
What is exception handling?
Checked and unchecked exceptions
Using the try block as an expression
Writing your own exception
Summary
Questions
Further reading
11
Testing in Object-Oriented Programming with Kotlin
Testing in Object-Oriented Programming with Kotlin
Technical requirements
Why testing?
Types of testing
The Kotlin test libraries
Testing examples
Summary
Questions
Further reading
12
Assessments
Assessments
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 8
Chapter 10
Chapter 11
13
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Interoperability

In this chapter, we will focus on the interoperability of Java and Kotlin. Interoperability refers to the ability to use both the Java and Kotlin languages in a single project. We can call Kotlin functions in Java as well as Java methods and variables in Kotlin code. This gives us the advantage of code reusability. For example, if we have an existing Java project with classes and functions, then we do not need to rewrite everything in Kotlin from scratch. Instead, we can use each and every line of Java code in Kotlin and start writing new functionalities here. Similarly, we can call Kotlin code in Java.

The following topics will be covered in this chapter:

  • Calling the Java static variable in Kotlin
  • Calling the Java static function in Kotlin
  • Calling the Java collection in Kotlin
  • Calling the Java class in Kotlin
  • Handling Kotlin reserve keywords
  • Calling the Kotlin...
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