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

Try this:

    ListIterator it = list.listIterator();

    while(it.hasNext()){

        while(it.hasNext()){
            System.out.println("back " + it.next() +" "); 
        }
        while(it.hasPrevious()){
            it.previous();
        }
    }