pure interface of class java.util.HashSet<A>

public class HashSet<A>
  extends AbstractSet<A>
  implements Set<A>, Cloneable, java.io.Serializable
{
    public HashSet();
    public HashSet(Collection<A> c);
    public HashSet(int initialCapacity,
                   float loadFactor);
    public HashSet(int initialCapacity);
    public Iterator<A> iterator();
    public int size();
    public boolean isEmpty();
    public boolean contains(A o);
    public boolean add(A o);
    public boolean remove(A o);
    public void clear();
    public Object clone();
}