Stack iterator

// Stack iterator£ºlinked-list implementation
import java.util.Iterator;
public class Stack<Item> implements Iterable<Item> {
	public Iterator<Item> iterator£¨£©{
		return new ListIterator();
	}
	private class ListIterator implements Iterator<Item>{
		private Node current = first;
		public boolean hasNext(){
			return current !=null;
		}
		public void remove() {
			/*not supported*/
		}
		public Item next() {
			Item item =  current. item;
			current = current.next;
			return item;
		}
	}
}

// Stack iterator: array implementation
import java.util.Iterator;
public class Stack<Item> implements Iterable<Item> {
	public Iterator<Item> iterator () {
		return new ReverseArrayIterator();
	}
	private class ReverseArrayIterator implements Iterator <Item> {
		private int i = N ;
		pubklic boolean hasNext() {
			return i>0;
		}
		public void remove() {
			/*not supported */
		}
		public Item next() {
			return s[--i];
		}
}