# GlobalScope.launch() Builder

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Published 2022-09-24

This tutorial explains how we can use GlobalScope.launch() method in order to start a coroutine in Kotlin. This coroutine will run as a thread, in parallel with the main thread.

Info

GlobalScope.launch() method is considered a Coroutine Builder as it creates a coroutine.

Take a look at the following example created with Spring Boot 3.0, maven in Kotlin:

Demo1Application.java
package com.example.demo1

import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication

@SpringBootApplication
class Demo1Application

suspend fun main(args: Array<String>) {
	runApplication<Demo1Application>(*args)

	GlobalScope.launch {
		println("START: Launch I")
		delay(3000L)
		println("Launch I - end")
	}
	GlobalScope.launch {
		println("START: Launch II")
		delay(2000L)
		println("Launch II - end")
	}
	GlobalScope.launch {
		println("START: Launch III")
		delay(1000L)
		println("Launch III - end")
	}
	println("END")
}

When we run this code we receive the following output:

END
START: Launch III
START: Launch I
START: Launch II
Launch III - end
Launch II - end
Launch I - end

Info

The starting order of the coroutines in this could change from one application run to another.