Learn KOTLIN with Real Code Examples

Updated Nov 17, 2025

Introduction & Fundamentals Setup & Configuration Architecture & Deep Internals Performance & Security Development Workflow Learning & Career Growth Business & Strategy Examples

Installation Setup

Install IntelliJ IDEA or Android Studio

Install JDK (17+ recommended)

Install Kotlin via SDKMAN or compiler CLI

Set up Gradle or Maven project

Environment Setup

Install JDK

Install IDE (IntelliJ/Android Studio)

Setup Gradle Kotlin DSL

Install KMP or Compose plugins if needed

Config Files

build.gradle.kts

settings.gradle.kts

local.properties (Android)

Cli Commands

kotlinc Main.kt -include-runtime -d main.jar

gradle build

gradle run

kotlin main.jar

Internationalization

KMP expect/actual resource APIs

Android XML string resources

JS i18n via Kotlin/JS

Compose Multiplatform i18n libraries

Accessibility

Compose accessibility APIs

Android accessibility services

Semantic nodes in Compose

Internationalization via resource bundles

Ui Styling

Compose Multiplatform

XML layouts (legacy Android)

Typed design tokens in Compose

KMP resource management

State Management

StateFlow for observable state

MutableState for Compose

Redux-like MVI for KMP

ViewModels for Android

Data Management

Kotlinx.serialization

Exposed ORM

SQLDelight for KMP

Room for Android