import java.util.*
import java.util.concurrent.Executors
import java.util.concurrent.TimeUnit

var value: HashMap<String, String> = HashMap()
val executor = Executors.newFixedThreadPool(40)!!

fun main(args: Array<String>) {
    for (i in 0..20) {
        executor.submit {
            try {
                (0..99999).forEach { i ->
                    value.put("value$i", "$i")
                    value.put("thread", Thread.currentThread().id.toString())
                }
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
    }
    for (i in 0..20) {
        executor.submit {
            try {
                (0..99999).forEach { i ->
                    var iterator = value.iterator()
                    while (iterator.hasNext()) {
                        iterator.next().value
                    }
                }
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
    }
    executor.shutdown()
    executor.awaitTermination(60, TimeUnit.SECONDS)
}