Tests if this thread group is either the thread group
argument or one of its ancestor thread groups.
@param g a thread group.
@return {@code true} if this thread group is the thread group
argument or one of its ancestor thread groups;
{@code false} otherwise.
Tests if this thread group is either the thread group argument or one of its ancestor thread groups.
@param g a thread group. @return {@code true} if this thread group is the thread group argument or one of its ancestor thread groups; {@code false} otherwise.