@throws ClassCastException {@inheritDoc}
@throws NullPointerException if {@code fromKey} or {@code toKey} is
null and this map uses natural ordering, or its comparator
does not permit null keys
@throws IllegalArgumentException {@inheritDoc}
@since 1.6
NavigableMap!(K, V)subMap(K fromKey, bool fromInclusive, K toKey, bool toInclusive)
@throws ClassCastException {@inheritDoc} @throws NullPointerException if {@code fromKey} or {@code toKey} is null and this map uses natural ordering, or its comparator does not permit null keys @throws IllegalArgumentException {@inheritDoc} @since 1.6