FluentIterator implements ImmutableIterator<T> { public List<T> take(int n) { return Iterators.take(this, n); } FluentIterator(Iterator<T> t); static FluentIterator<T> fluent(Iterator<T> t); @Override boolean hasNext(); @Override T next(); boolean weakEquals(Iterator<T> s, int n); @SuppressWarnings("unchecked") FluentIterator<T> filter(Predicate<? super T> p); boolean any(Predicate<? super T> p); boolean all(Predicate<? super T> p); @SuppressWarnings("unchecked") FluentIterator<T> concat(Iterator... ts); FluentIterator<T> peek(Consumer<? super T> cs); List<T> take(int n); List<T> takeAll(); FluentIterator<T> limit(int n); List<FluentIterator<T>> tee(int n); FluentIterator<Pair<T, S>> zip(Iterator<S> s, boolean weak); FluentIterator<List<T>> groupBy(Function<T, K> key); FluentIterator<List<T>> groupBy(); FluentIterator<T> skipDuplicates(Function<T, K> key); FluentIterator<T> skipDuplicates(); FluentIterator<T> keepFirst(Function<? super T, ? extends K> key); FluentIterator<T> keepLast(Function<? super T, ? extends K> key); FluentIterator<V> map(Function<T, V> f); FluentIterator<T> map(Iterator<T> t, BinaryOperator<T> f); T reduce(BinaryOperator<T> f); V reduce(BiFunction<V, T, V> f, V start);  }
@Test public void testTake() { List<Integer> xs = fluent(repeat(27, 100)).take(0); assertEquals(0, xs.size()); xs = fluent(repeat(27, 100)).take(39); assertEquals(39, xs.size()); xs = fluent(repeat(27, 100)).take(101); assertEquals(100, xs.size()); }