How to use

nullKeyIndex

method

in

org.apache.logging.log4j.util.SortedArrayStringMap

@Override
public int indexOfKey(final String key) {
  if (keys == EMPTY) {
    return -1;
  }
  if (key == null) { // null key is located at the start of the array
    return nullKeyIndex(); // insert at index zero
  }
  final int start = size > 0 && keys[0] == null ? 1 : 0;
  return Arrays.binarySearch(keys, start, size, key);
}

@Override
public int indexOfKey(final String key) {
  if (keys == EMPTY) {
    return -1;
  }
  if (key == null) { // null key is located at the start of the array
    return nullKeyIndex(); // insert at index zero
  }
  final int start = size > 0 && keys[0] == null ? 1 : 0;
  return Arrays.binarySearch(keys, start, size, key);
}