content: package com.iluwatar.iterator;
  
  /**
   * 
   * Iterator (ItemIterator) adds abstraction layer on top of a collection
   * (TreasureChest). This way the collection can change its internal
   * implementation without affecting its clients.
   * 
   */
  public class App {
  
  	public static void main(String[] args) {
  		TreasureChest chest = new TreasureChest();
  
  		ItemIterator ringIterator = chest.Iterator(ItemType.RING);
  		while (ringIterator.hasNext()) {
  			System.out.println(ringIterator.next());
  		}
  
  		System.out.println("----------");
  
  		ItemIterator potionIterator = chest.Iterator(ItemType.POTION);
  		while (potionIterator.hasNext()) {
  			System.out.println(potionIterator.next());
  		}
  
  		System.out.println("----------");
  
  		ItemIterator weaponIterator = chest.Iterator(ItemType.WEAPON);
  		while (weaponIterator.hasNext()) {
  			System.out.println(weaponIterator.next());
  		}
  
  		System.out.println("----------");
  
  		ItemIterator it = chest.Iterator(ItemType.ANY);
  		while (it.hasNext()) {
  			System.out.println(it.next());
  		}
  	}
  }
  