Comment copier en utilisant la méthode enumerate() en Java ?

public static void main(String[] args) throws InterruptedException { ThreadGroup myGroup = new ThreadGroup("MyGroup"); Thread thread = new Thread(myGroup,()->{ while (true){ try{ TimeUnit.SECONDS.sleep(1); }catch (InterruptedException e){ e.printStackTrace(); } } },"MyThread"); thread.start(); TimeUnit.MILLISECONDS.sleep(1); ThreadGroup mainGroup = currentThread().getThreadGroup(); Thread[] list = new Thread[mainGroup.activeCount()]; int recurseSize = mainGroup.enumerate(list); System.out.println(recurseSize); recurseSize = mainGroup.enumerate(list,false); System.out.println(recurseSize); }