* @param <V> the value type of {@link HashMap}
     * @return a new instance of {@link HashMap}
     * @see HashMap#HashMap()
     */
    public static <K, V> HashMap<K, V> newHashMap() {
        return new HashMap<>();
    }

    /**
     * Creates and returns a new instance of {@link HashMap}.
     *
     * @param <K> the key type of {@link HashMap}