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());
    	}
    }
}