Method firstKey

lib/java/util/TreeMap.java:1253–1259

Returns the first key in this map. @return the first key in this map. @throws NoSuchElementException if this map is empty.

()

     *                if this map is empty.
     */
    public K firstKey() {
        if (root != null) {
            Node<K, V> node = minimum(root);
            return node.keys[node.left_idx];
        }
        throw new NoSuchElementException();
    }


    /**