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.
Table of Contents (14 chapters)

Writing your own exception

If the Java standard library doesn't contain an exception that fits with the business requirements of your application, you can implement your own exception. All exceptions that inherit the Error class must be thrown by the Java Virtual Machine, so we shouldn't extend this class. If you decide to implement your own exception, you should prefer to create only checked exceptions because, if you throw an exception with the RuntimeException type, there is no guarantee that it will be caught in Java code. In Kotlin, you can extend any subtype of the Exception class because Kotlin doesn't support a checked exception.

Let's suggest that we want to develop a ToDo list application that contains the ToDoStorage class, which contains the set method and throws ToDoAlreadyExistException. The ToDoStorage class may look as follows:

class ToDoStorage...