Thread.activeCount() is different in Java and Kotlin

1

fun main() {

…
while (Thread.activeCount() > 1) {
Thread.yield()
}
…
}

When i use Thread.activeCount() in Kotlin project, the result always 2，but in pure Java project, the result is 1.

2

So? So shouldn’t rely on Thread.activeCount(), any library you use can create random additional Threads.
Thread.yield() is also a method that you shouldn’t use, as it has no defined behaviour.

You probably just want to put all the threads you care about in a list or something an call join() on them?