* @return a new instance of {@link ConcurrentHashMap}
     * @see ConcurrentHashMap#ConcurrentHashMap()
     */
    public static <K, V> ConcurrentHashMap<K, V> newConcurrentHashMap() {
        return new ConcurrentHashMap<>();
    }

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