Check System threads

package multithreading;

public class System_Threads
{
public static void main(String[] args)
{
  System.out.println(Thread.currentThread().getThreadGroup().getParent().getName());
  System.out.println("*********************************************");
  ThreadGroup gr = Thread.currentThread().getThreadGroup().getParent();
  Thread [] arr = new Thread[gr.activeCount()];
  gr.enumerate(arr);
  for(Thread t1 : arr)
  {
  System.out.println(t1.getName()+"~~"+t1.isDaemon());
  }
}

}

_________________________________________________________

output:

system

*********************************************

Reference Handler~~true

Finalizer~~true

Signal Dispatcher~~true

Attach Listener~~true

main~~false