What tools and libraries for multithreading are applicable in Kotlin?

In Kotlin, the following tools and libraries are widely used for multithreading:

• Coroutines — the main and recommended way for asynchronous and parallel programming. They allow writing non-blocking code with simple syntax.

• Thread — a class from the Java standard library, also available in Kotlin, for creating and managing threads directly.

• ExecutorService — from the Java Concurrency API, for managing thread pools and executing tasks.

• RxJava — a library for reactive programming, supporting asynchronous data streams.

Example of using coroutines:

import kotlinx.coroutines.*

fun main() = runBlocking {
    launch {
        delay(1000L)
        println("Hello from coroutine!")
    }
    println("Hello from main")
}

The coroutine approach is preferred in modern Kotlin projects, especially on Android.