Kotlin Online Compiler

Compile and run Kotlin programs with our modern Kotlin compiler. Perfect for Android development, server-side programming, and learning Kotlin's concise syntax.

kotlin Online Compiler

fun main() {
    println("Hello, World!")
    println("Welcome to Kotlin Online Compiler")
    
    // Variables and data types
    val language = "Kotlin"
    var version = 1.9
    val isInteroperable = true
    
    println("Language: $language")
    println("Version: $version")
    println("Java Interoperable: $isInteroperable")
    
    // Collections and higher-order functions
    val numbers = listOf(1, 2, 3, 4, 5)
    println("Numbers: $numbers")
    
    val squares = numbers.map { it * it }
    println("Squares: $squares")
    
    val evenNumbers = numbers.filter { it % 2 == 0 }
    println("Even numbers: $evenNumbers")
    
    // Data classes
    data class Person(val name: String, val age: Int)
    
    val person = Person("Developer", 28)
    println("Person: $person")
    
    // When expression
    val grade = 85
    val letterGrade = when {
        grade >= 90 -> "A"
        grade >= 80 -> "B"
        grade >= 70 -> "C"
        grade >= 60 -> "D"
        else -> "F"
    }
    println("Grade $grade is: $letterGrade")
    
    // Extension functions
    fun String.addExclamation() = this + "!"
    println("Kotlin is awesome".addExclamation())
}

Output

Click "Run" to execute your code and see the output here...

Kotlin Compiler Features

Kotlin 1.9 with latest features
100% Java interoperability
Null safety and type inference
Extension functions and coroutines
Data classes and sealed classes

About Kotlin Programming

Kotlin is a modern programming language developed by JetBrains that runs on the Java Virtual Machine. It's officially supported by Google for Android development and is 100% interoperable with Java.

Kotlin combines object-oriented and functional programming features, offering concise syntax, null safety, and powerful features like coroutines for asynchronous programming.

Use our Kotlin online compiler to develop Android apps, server-side applications, or learn Kotlin's modern programming features without any setup.