CookieCollection implements Collection<Cookie> { @Override public boolean addAll(Collection<? extends Cookie> collection) { boolean result = false; for(Cookie cookie : collection) { result|= add(cookie); } return result; } CookieCollection();  CookieCollection(Cookie... cookies);  CookieCollection(Collection<? extends Cookie> cookies); @Override int size(); @Override boolean isEmpty(); @Override boolean contains(Object o); @Override Iterator<Cookie> iterator(); Cookie [] toArray(); @Override T[] toArray(T[] ts); @Override boolean add(Cookie cookie); @Override boolean remove(Object o); Cookie get(String name); @Override boolean containsAll(Collection<?> collection); @Override boolean addAll(Collection<? extends Cookie> collection); @Override boolean removeAll(Collection<?> collection); @Override boolean retainAll(Collection<?> collection); @Override void clear();  }
@Test @SuppressWarnings("unchecked") public void addAll() throws Exception { CookieCollection cookies = new CookieCollection(); List<Cookie> content = Arrays.asList(cookie, brownieCookie, cupsCookie); boolean modified = cookies.addAll(content); Assert.assertTrue(modified); Assert.assertEquals(3, cookies.size()); Assert.assertTrue(cookies.containsAll(content)); Assert.assertFalse(cookies.addAll(Collections.EMPTY_LIST)); }