Notifies the group that the thread {@code t} has terminated.
<p> Destroy the group if all of the following conditions are
true: this is a daemon thread group; there are no more alive
or unstarted threads in the group; there are no subgroups in
this thread group.
Notifies the group that the thread {@code t} has terminated.
<p> Destroy the group if all of the following conditions are true: this is a daemon thread group; there are no more alive or unstarted threads in the group; there are no subgroups in this thread group.
@param t the Thread that has terminated