A better and more complete example

jeorg-kotlin-coroutines/coroutines-crums-group-1/src/main/kotlin/org/jesperancinha/ktd/SimpleConcurrency.kt

@@ -1,27 +1,42 @@
 package org.jesperancinha.ktd
 
 import kotlinx.coroutines.async
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.time.delay
+import java.lang.Thread.sleep
 import java.time.Duration
-import kotlin.random.Random
 import kotlin.random.Random.Default.nextLong
+import kotlin.system.measureTimeMillis
 
 class SimpleConcurrency {
     companion object {
+        /**
+         * This test runs sleep with the purpose to show concurrency in coroutines
+         */
         @JvmStatic
-        fun main(args: Array<String> = emptyArray()) = runBlocking{
-            val coroutine1 = async {
-                delay(Duration.ofMillis(nextLong(500)))
-                println("Coroutine 1 is complete!")
+        fun main(args: Array<String> = emptyArray()) = runBlocking {
+            val timeToRun = measureTimeMillis {
+                val coroutine1 = async {
+                    delay(Duration.ofMillis(nextLong(100)))
+                    async {
+                        val randomTime = nextLong(500)
+                        sleep(Duration.ofMillis(randomTime))
+                        println("Coroutine 1 is complete in $randomTime!")
+                    }.await()
+                }
+                val coroutine2 =
+                    async {
+                        delay(Duration.ofMillis(nextLong(100)))
+                        async {
+                            val randomTime = nextLong(500)
+                            sleep(Duration.ofMillis(randomTime))
+                            println("Coroutine 2 is complete in $randomTime!")
+                        }.await()
+                    }
+                coroutine2.await()
+                coroutine1.await()
             }
-            val coroutine2 = async {
-                delay(Duration.ofMillis(nextLong(500)))
-                println("Coroutine 2 is complete!")
-            }
-            coroutine2.await()
-            coroutine1.await()
+            println("Time to run is $timeToRun milliseconds")
         }
     }
 }