Example 2 (corrected)

/*
Example 2 from the Jan. 2016 "Programmez" article (fair use), with some minor formatting changes and some variable names translated to English:

Old code:
*/

PaymentCard mainCardToReturn = null;
for(final PaymentCard card: paymentCards) {
  if(!card.isExpired() && !card.isDefault()
    && mainCardToReturn == null ||
      mainCardToReturn.creationDate().before(card.getCreationDate())) {
    mainCardToReturn = card;
  }
}

/*
New Java-8 stream Code:
*/
PaymentCard mainCardToReturn = paymentCards.stream()
  .filter(card -> !card.isExpired() && !card.isDefault())
  .min(Comparator.comparing(card -> card.getCreationDate().getTime()))
  .orElse(null);

/*
It's difficult to follow in the "Programmez" article, but apparently the benchmark for this change actually showed a performance improvement (executed in Contiperf 100 times, the old code took 30 ns and the new Java-8 stream code took 14 ns).

What I do not understand is why payment cards flagged as "default" are filtered out, but that's the business logic they preserved.
*/