Introduction
Before writing Kotlin code, you need a working environment. There are several ways to get started: using IntelliJ IDEA (which bundles the Kotlin plugin), installing the standalone Kotlin command-line compiler (kotlinc), trying code instantly in the browser-based Kotlin Playground, or configuring a build tool like Gradle or Maven for larger JVM projects. Each option suits a different stage of learning or project scale.
Cricket analogy: Choosing between IntelliJ IDEA, kotlinc, the Playground, or Gradle to start coding is like a young cricketer choosing between a full academy, a solo net session, a quick backyard game, or a structured league setup, depending on their stage.
Syntax
# Compile a Kotlin file into an executable jar
kotlinc file.kt -include-runtime -d file.jar
# Run the compiled jar
java -jar file.jarExplanation
IntelliJ IDEA is the most common way to start, since it ships with the Kotlin plugin built in, offering syntax highlighting, autocompletion, and a Run button. For quick experiments without any installation, the Kotlin Playground lets you write and execute Kotlin directly in a web browser. For command-line use, installing the kotlinc compiler lets you compile .kt files into a runnable .jar with the -include-runtime flag, or run scripts directly. For larger, multi-file JVM projects, teams typically configure Gradle or Maven with the Kotlin plugin, which manages dependencies and build steps automatically.
Cricket analogy: IntelliJ IDEA with its bundled plugin is like a franchise team's full support staff giving instant feedback, the Playground is like a quick net session in your backyard, and kotlinc with -include-runtime packages your final performance into a match-ready highlight reel (a runnable jar).
Example
// hello.kt
fun main() {
println("Kotlin environment is ready!")
}
/* Terminal:
$ kotlinc hello.kt -include-runtime -d hello.jar
$ java -jar hello.jar
Kotlin environment is ready!
*/Key Takeaways
- IntelliJ IDEA bundles the Kotlin plugin, making it the easiest way to start.
- The standalone compiler kotlinc can compile .kt files into runnable .jar files.
- The Kotlin Playground lets you run code in the browser with no install needed.
- Gradle and Maven with the Kotlin plugin are used for larger JVM projects.
kotlinc file.kt -include-runtime -d file.jarproduces a jar that runs withjava -jar.
Practice what you learned
1. Which IDE bundles the Kotlin plugin by default?
2. What is the name of the standalone Kotlin command-line compiler?
3. What does the `-include-runtime` flag do when compiling with kotlinc?
4. What is the Kotlin Playground primarily used for?
5. Which build tools commonly use the Kotlin plugin for larger JVM projects?
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