package queues;

public interface Iterator<E> {
	
	/*
	 * Returns true if the iteration has more elements. 
	 * In other words, returns true if next would return 
	 * an element rather than throwing an exception. 
	 */
	boolean hasNext();
	
	/*
	 * Returns the next element in the iteration. 
	 */
	E next();
	
	/*
	 * Removes from the underlying collection the last element 
	 * returned by the iterator (optional operation). 
	 * This method can be called only once per call to next. 
	 * The behavior of an iterator is unspecified if the underlying collection
	 * is modified while the iteration is in progress 
	 * in any way other than by calling this method. 
	 */
	void remove();
}