Kotlin Programming for Android and Backend - Modern, Expressive Language Interoperable with Java and Server-Side Development #1008204

Kotlin is the language Android development settled on and the JVM ecosystem is embracing. It is concise, null-safe, coroutine-native, and fully interoperable with Java. This book teaches it end to end — from syntax and data classes to coroutines and Kotlin Multiplatform.

You will cover the type system and null safety, functions and higher-order functions, classes and sealed hierarchies, generics and variance, collections and sequences, and the coroutine model that makes structured concurrency possible. Then you will build on both sides of the client-server divide: Android apps with Jetpack Compose and backend services with Ktor or Spring Boot. The final chapters cover Kotlin Multiplatform for shared business logic, testing with Kotest and MockK, and the Gradle Kotlin DSL that ties everything together.

Working code throughout. Runs on any Kotlin 2.0 toolchain.