code: final Entry<K, V> getEntry(Object key) {
  	int hash = (key == null) ? 0 : hash(key);
  	for (Entry<K, V> e = table[indexFor(hash, table.length)]; e != null; e = e.next) {
  	    if (e.hash == hash && ((e.key) == key || (key != null && key.equals(e.key)))) return e;
  	}
  	return null;
      }
docs: Returns the entry associated with the specified key in the HashMap. Returns null if the HashMap
  contains no mapping for the key.