paster

public class Main {

	public static void main(String[] args) throws Exception {

		Balls b = new Balls() {
			
			List l = new ArrayList<Integer>();
			{l.add(1);
			l.add(2);
			l.add(3);
			l.add(4);
			}
			Iterator<Integer> i = l.iterator();
			
			public Integer next() {			
				return i.hasNext() ? i.next() : null;
			}
		};
		
		for(Integer i = b.next(); i != null; i = b.next()) {
			System.out.println("works :" + i);
		}
	}

	interface Balls {
		Integer next();
	}
}