@Deprecated
  public static <T> PeekingIterator<T> peekingIterator(PeekingIterator<T> iterator) {
    return checkNotNull(iterator);
  }
@Deprecated
  public static <T> PeekingIterator<T> peekingIterator(PeekingIterator<T> iterator) {
    return checkNotNull(iterator);
  }
@ Deprecated public static < T > PeekingIterator < T > peekingIterator ( PeekingIterator < T > iterator ) { return checkNotNull ( iterator ) ; }
Simply returns its argument.

@deprecated no need to use this
@since 10.0
Simply returns its argument .