Вопрос по работе итератора.

import java.util.*;
 
class ReversibleArrayList<T> extends ArrayList<T> {
  public ReversibleArrayList(Collection<T> c) { super(c); }
  public Iterable<T> reversed() {
    return new Iterable<T>() {
      public Iterator<T> iterator() {
        return new Iterator<T>() {
          int current = size() - 1;
          public boolean hasNext() { return current > -1; }
          public T next() { return get(current--); }
          public void remove() { // Not implemented
            throw new UnsupportedOperationException();
          }
        };
      }
    };
  }
}   
 
public class AdapterMethodIdiom {
  public static void main(String[] args) {
    ReversibleArrayList<String> ral =
      new ReversibleArrayList<String>(
        Arrays.asList("To be or not to be".split(" ")));
    // Grabs the ordinary iterator via iterator():
    for(String s : ral)
      System.out.print(s + " ");
    System.out.println();
    // Hand it the Iterable of your choice
    for(String s : ral.reversed())
      System.out.print(s + " ");
  }
}

public T next() { return get(--current); }

 int current = size() - 1;

for(String s : ral.reversed())
      System.out.print(s + " ");

Iteratable tmpIterable = ral.reversed();
Iterator tmpIterator = tmpIterable.iterator();
while (tmpIterator.hasNext())
{
   String s = tmpIterator.next();
   System.out.print(s + " ");
}

for (Iterator iterator = collection.iterator(); iterator.hasNext();) {
            type type = (type) iterator.next();
            
        }