Method keyOrNull

corpus/java/training/guava/collect/Maps.java:3656–3659

(@Nullable Entry<K, ?> entry)

  }

  @Nullable
  static <K> K keyOrNull(@Nullable Entry<K, ?> entry) {
    return (entry == null) ? null : entry.getKey();
  }

  @Nullable
  static <V> V valueOrNull(@Nullable Entry<?, V> entry) {