throw new UnsupportedOperationException();
  }

  public final boolean removeAll(Collection<?> oldElements) {
    throw new UnsupportedOperationException();
  }

  public final boolean removeIf(Predicate<? super E> predicate) {
    throw new UnsupportedOperationException();
  }

  public final boolean retainAll(Collection<?> elementsToKeep) {
    throw new UnsupportedOperationException();
  }

   * @since 2.0
   */
  @CanIgnoreReturnValue
  public static <T extends @Nullable Object> boolean removeIf(
      Iterable<T> removeFrom, Predicate<? super T> predicate) {
    if (removeFrom instanceof Collection) {
      return ((Collection<T>) removeFrom).removeIf(predicate);
    }
    return Iterators.removeIf(removeFrom.iterator(), predicate);
  }

   */
  @CanIgnoreReturnValue
  public static <T extends @Nullable Object> boolean removeIf(
      Iterable<T> removeFrom, Predicate<? super T> predicate) {
    if (removeFrom instanceof RandomAccess && removeFrom instanceof List) {
      return removeIfFromRandomAccessList((List<T>) removeFrom, checkNotNull(predicate));
    }
    return Iterators.removeIf(removeFrom.iterator(), predicate);
  }

    assertEquals(newArrayList("a", "c", "e"), list);
  }

  public void testRemoveIf() {
    List<String> list = newArrayList("a", "b", "c", "d", "e");
    assertTrue(
        Iterators.removeIf(
            list.iterator(),
            new Predicate<String>() {
              @Override
              public boolean apply(String s) {
                return s.equals("b") || s.equals("d") || s.equals("f");

   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final boolean removeIf(Predicate<? super E> filter) {
    throw new UnsupportedOperationException();
  }

  /**
   * Guaranteed to throw an exception and leave the collection unmodified.
   *

      for (E element : collection) {
        checkArgument(predicate.apply(element));
      }
      return unfiltered.addAll(collection);
    }

    @Override
    public void clear() {
      Iterables.removeIf(unfiltered, predicate);
    }

    @Override
    public boolean contains(@CheckForNull Object element) {
      if (safeContains(unfiltered, element)) {

    }

    @Override
    public Iterator<V> iterator() {
      return new ValueIterator();
    }

    @Override
    public boolean removeIf(Predicate<? super V> filter) {
      checkNotNull(filter);
      return LocalCache.this.removeIf((k, v) -> filter.test(v));
    }

    @Override
    public boolean contains(Object o) {
      return LocalCache.this.containsValue(o);
    }

  }

  public void testFromArrayAndIteratorRemove() {
    FluentIterable<TimeUnit> units = FluentIterable.from(TimeUnit.values());
    try {
      Iterables.removeIf(units, Predicates.equalTo(TimeUnit.SECONDS));
      fail("Expected an UnsupportedOperationException to be thrown but it wasn't.");
    } catch (UnsupportedOperationException expected) {
    }
  }

    assertEquals(newArrayList("a", "c", "e"), list);
  }

  public void testRemoveIf() {
    List<String> list = newArrayList("a", "b", "c", "d", "e");
    assertTrue(
        Iterators.removeIf(
            list.iterator(),
            new Predicate<String>() {
              @Override
              public boolean apply(String s) {
                return s.equals("b") || s.equals("d") || s.equals("f");

  }

  public void testFromArrayAndIteratorRemove() {
    FluentIterable<TimeUnit> units = FluentIterable.from(TimeUnit.values());
    try {
      Iterables.removeIf(units, Predicates.equalTo(TimeUnit.SECONDS));
      fail("Expected an UnsupportedOperationException to be thrown but it wasn't.");
    } catch (UnsupportedOperationException expected) {
    }
  }