Iterate twice on values (MapReduce)

Question

I receive an iterator as argument and I would like to iterate on values twice.

public void reduce(Pair key, Iterator          


        

Answer 1

if you want to change values as you go, i guess it's better to use listIterator then use its set() method.

ListIterator lit = list.listIterator();
while(lit.hasNext()){
   String elem = (String) lit.next();
   System.out.println(elem);
   lit.set(elem+" modified");
}
lit = null; 
lit = list.listIterator();
while(lit.hasNext()){
   System.out.println(lit.next());
}

Instead of calling .previous(), I just get another instance of the .listIterator() on the same list iterator object.