Method addAll

guava/src/com/google/common/collect/Iterators.java:363–373

Adds all elements in {@code iterator} to {@code collection}. The iterator will be left exhausted: its {@code hasNext()} method will return {@code false}. @return {@code true} if {@code collection} was modified as a result of this operation

(
      Collection<T> addTo, Iterator<? extends T> iterator)

   * @return {@code true} if {@code collection} was modified as a result of this operation
   */
  @CanIgnoreReturnValue
  public static <T extends @Nullable Object> boolean addAll(
      Collection<T> addTo, Iterator<? extends T> iterator) {
    checkNotNull(addTo);
    checkNotNull(iterator);
    boolean wasModified = false;
    while (iterator.hasNext()) {
      wasModified |= addTo.add(iterator.next());
    }
    return wasModified;
  }

  /**
   * Returns the number of elements in the specified iterator that equal the specified object. The