Explanation
1. enumerate() can be used to copy Thread and ThreadGroup.
2. ThreadGroup can add several Threads and several sub-ThreadGroups. This method can be used to easily copy.
Example
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);
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