Tests if this thread group is a daemon thread group. A
daemon thread group is automatically destroyed when its last
thread is stopped or its last thread group is destroyed.
@return {@code true} if this thread group is a daemon thread group;
{@code false} otherwise.
Tests if this thread group is a daemon thread group. A daemon thread group is automatically destroyed when its last thread is stopped or its last thread group is destroyed.
@return {@code true} if this thread group is a daemon thread group; {@code false} otherwise.