8 * Return the value of the first key that exists in the map
10 public static <K, V> V getFirst(Map<K, V> map, K... keys)
12 return getFirst(false, map, keys);
15 public static <K, V> V getFirst(boolean nonNull, Map<K, V> map, K... keys)
19 if (map.containsKey(key))
21 if (!(nonNull && (map.get(key) == null)))
34 public static <K> boolean containsAKey(Map<K, ?> map, K... keys)
38 if (map.containsKey(key))