Weird Memory

WeirdMemory.kt

object TestThreadClientMode {
    private var done: Boolean = false
    @Throws(InterruptedException::class)
    @JvmStatic
    fun main(args: Array<String>) {
        Thread(Runnable {
            var count = 0
            while (!done) {
                count++
                println(count);
            }
            println("Done! " + Thread.currentThread().name + "  " + done)
        }).start()
        println("OS: " + System.getProperty("os.name"))

        Thread.sleep(1000)
        done = true

        println("flag done set true ")
    }
}