public ArrayList<Value> keys(){
  ArrayList<Value> list=New.arrayList(size);
  for (  Value k : keys) {
    if (k != null && k != ValueNull.DELETED) {
      list.add(k);
    }
  }
  return list;
}

public ArrayList < Value > keys ( ) { ArrayList < Value > list = New . arrayList ( size ) ; for ( Value k : keys ) { if ( k != null && k != ValueNull . DELETED ) { list . add ( k ) ; } } return list ; }
get the list of keys .
