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challenge 1 -- inside the Collection


  1. boolean add(E e)
  2. Object[] toArray()
  3. boolean addAll(Collection<? extends E> c)
  4. boolean remove(Object o)
  5. E get(int index)
  6. boolean isEmpty()
  7. E lower(E e)
  8. boolean retainAll(Collection<?> c)
  9. boolean offer(E e)
  10. int size()
  11. V remove(Object key)
  12. void clear()
  13. Collection<V> values()
  14. default Stream< E e> stream()
  15. default boolean removeIf(Predicate<? super E> filter)
  16. boolean contains(Object o)