package lab4B;

import java.util.NoSuchElementException;

/**simplified version of the java.util set interface*/


public interface Set<E> extends Iterable<E>{
		
		/**Adds the specified element to this set if not already present*/
		public boolean add(E e);
		
		
		/**Removes all of the elements from this set*/
		public void clear();
		
		/**Returns true if this set contains the specified element*/
		public boolean contains(E e);
		
		
		/**Returns true if this set contains no elements*/
		public boolean isEmpty();
		
		
		/**Removes the specified element from this set, if it is present*/
		public boolean remove(E e);
		
		
		/**Returns the number of elements in this set (its cardinality)*/
		public int size();
		
		/** returns an element of the set, if it is not empty*/
		 public E returnElement() throws NoSuchElementException;
		}