@Override public boolean contains(Object key){
  if (key == null)   return _map._nullValue != null;
  K1[] keys=_map._keys;
  for (int i=keys.length - 1; i >= 0; i--) {
    K1 testKey=keys[i];
    if (key.equals(testKey))     return true;
  }
  return false;
}

@ Override public boolean contains ( Object key ) { if ( key == null ) return _map . _nullValue != null ; K1 [ ] keys = _map . _keys ; for ( int i = keys . length - 1 ; i >= 0 ; i -- ) { K1 testKey = keys [ i ] ; if ( key . equals ( testKey ) ) return true ; } return false ; }
returns true if the map contains the value .
