How to use

findKey

method

in

it.unimi.dsi.fastutil.objects.ObjectArraySet

@Override
public boolean contains(final Object k) {
  return findKey(k) != -1;
}
@Override

@Override
public boolean remove(final Object k) {
  final int pos = findKey(k);
  if (pos == -1)
    return false;
  final int tail = size - pos - 1;
  for (int i = 0; i < tail; i++)
    a[pos + i] = a[pos + i + 1];
  size--;
  a[size] = null;
  return true;
}
@Override

@Override
public boolean add(final K k) {
  final int pos = findKey(k);
  if (pos != -1)
    return false;
  if (size == a.length) {
    final Object[] b = new Object[size == 0 ? 2 : size * 2];
    for (int i = size; i-- != 0;)
      b[i] = a[i];
    a = b;
  }
  a[size++] = k;
  return true;
}
@Override