public void addAll(Set<? extends V> m){
  tryPresize(m.size());
  Iterator<? extends V> it=m.iterator();
  while (it.hasNext()) {
    putKey(it.next(),false);
  }
}

public void addAll ( Set < ? extends V > m ) { tryPresize ( m . size ( ) ) ; Iterator < ? extends V > it = m . iterator ( ) ; while ( it . hasNext ( ) ) { putKey ( it . next ( ) , false ) ; } }
copies all of the mappings from the specified map to this one . these mappings replace any mappings that this map had for any of the keys currently in the specified map .
