java.lang.ThreadGroup[name=main,maxpri=10]
java.lang.ThreadGroup[name=system,maxpri=10]
main
10
false
java.lang.ThreadGroup[name=system,maxpri=10]
null
system
10
false
main:
[Thread[main,5,main]]
[]
system:
[Thread[FinalizerDaemon,5,system], Thread[FinalizerWatchdogDaemon,5,system], Thread[HeapTaskDaemon,5,system], Thread[ReferenceQueueDaemon,5,system], Thread[Signal Catcher,5,system]]
[java.lang.ThreadGroup[name=main,maxpri=10]]