Known Indirect Subclasses
ThreadGroup is a means of organizing threads into a hierarchical structure.
Implemented by objects that want to handle cases where a thread is being
terminated by an uncaught exception. Upon such termination, the handler
is notified of the terminating thread and causal exception. If there is
no explicit handler set then the thread's group is the default handler.
(Thread thread, Throwable ex)
The thread is being terminated by an uncaught exception. Further
exceptions thrown in this method are prevent the remainder of the
method from executing, but are otherwise ignored.
the thread that has an uncaught exception
the exception that was thrown