*/
    public MultiIterator(final Iterator<E>... iterators) {
        assertArgumentNotNull("iterators", iterators);
        this.iterators = iterators;
    }

    @Override
    public boolean hasNext() {
        for (; index < iterators.length; ++index) {
            if (iterators[index].hasNext()) {
                return true;
            }
        }
        return false;
    }

    List<?> list = emptyList();
    Iterator<?> iterator = list.iterator();
    PeekingIterator<?> peekingIterator = Iterators.peekingIterator(iterator);

    assertThrows(NoSuchElementException.class, () -> peekingIterator.peek());
  }

  public void testPeekDoesntChangeIteration() {
    List<?> list = Lists.newArrayList("A", "B", "C");
    Iterator<?> iterator = list.iterator();

  }

  @CollectionSize.Require(ONE)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  public void testKeysEntrySetIteratorRemove() {
    Multiset<K> keys = multimap().keys();
    Iterator<Multiset.Entry<K>> itr = keys.entrySet().iterator();
    assertEquals(Multisets.immutableEntry(k0(), 1), itr.next());
    itr.remove();
    assertTrue(multimap().isEmpty());
  }

  @CollectionSize.Require(SEVERAL)

import java.io.BufferedReader;
import java.io.Reader;
import java.util.Iterator;
import java.util.NoSuchElementException;

import org.codelibs.core.exception.ClUnsupportedOperationException;

/**
 * {@link BufferedReader}から読み込んだ行単位の文字列を反復する{@link Iterator}です。
 * <p>
 * 次のように使います．
 * </p>
 *
 * <pre>
 * import static org.codelibs.core.io.LineIterator.*;
 *

  public Entry<K, V> firstEntry() {
    return Iterators.<@Nullable Entry<K, V>>getNext(entryIterator(), null);
  }

  @Override
  @CheckForNull
  public Entry<K, V> lastEntry() {
    return Iterators.<@Nullable Entry<K, V>>getNext(descendingEntryIterator(), null);
  }

  @Override
  @CheckForNull
  public Entry<K, V> pollFirstEntry() {
    return Iterators.pollNext(entryIterator());
  }

  @Override

      @Override
      public Iterator<T> iterator() {
        return Iterators.concat(
            /* lazily generate the iterators on each input only as needed */
            new AbstractIndexedListIterator<Iterator<? extends T>>(inputs.length) {
              @Override
              public Iterator<? extends T> get(int i) {
                return inputs[i].iterator();
              }
            });
      }

    /**
     * 
     * @param pairs
     * @param type
     * @return first occurance of the given type
     */
    public static AvPair get ( List<AvPair> pairs, int type ) {
        Iterator<AvPair> it = pairs.iterator();
        while ( it.hasNext() ) {
            AvPair p = it.next();
            if ( p.getType() == type ) {
                return p;
            }
        }
        return null;
    }

        return parent.indexOf(o);
    }

    @Override
    public boolean isEmpty() {
        return parent.isEmpty();
    }

    @Override
    public Iterator<Map<String, Object>> iterator() {
        return parent.iterator();
    }

    @Override
    public int lastIndexOf(final Object o) {
        return parent.lastIndexOf(o);
    }

    @Override

    Iterable<Long> convertedValues = STR_TO_LONG.convertAll(mutableList);
    assertEquals(ImmutableList.of(789L, 123L), ImmutableList.copyOf(convertedValues));

    Iterator<Long> iterator = convertedValues.iterator();
    iterator.next();
    iterator.remove();
    assertEquals(ImmutableList.of("123"), mutableList);
  }

  public void testReverse() {
    Converter<Long, String> reverseConverter = STR_TO_LONG.reverse();

import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.util.Iterator;
import java.util.NoSuchElementException;

import org.codelibs.core.exception.ClUnsupportedOperationException;
import org.codelibs.core.message.MessageFormatter;

/**
 * クラスの継承階層を親クラスに向かって反復する{@link Iterator}です。
 * <p>
 * 次のように使います．
 * </p>
 *
 * <pre>
 * import static org.codelibs.core.lang.ClassIterator.*;