Maps
containsKey(key)- Returns true if map contains a mapping for specified key.clear()- Empties map.entries()- Returns array of mappings contained in map.get(key)- Returns value to which the specified key is mapped.keys()- Returns array of keys contained within map.put(key, value)- Associates specified key with specified value in map.remove(key)- Removes entry for specified key and returns it.values()- Returns array of values in map.