java-design-patterns/iterator/src/main/java/com/iluwatar/App.java

package com.iluwatar;

/**
 *
 * 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());
        }
    }
}