How to use

tryCapacity

method

in

it.unimi.dsi.fastutil.bytes.Byte2ObjectOpenHashMap

@Override
public void putAll(Map<? extends Byte, ? extends V> m) {
  if (f <= .5)
    ensureCapacity(m.size()); // The resulting map will be sized for m.size() elements
  else
    tryCapacity(size() + m.size()); // The resulting map will be tentatively sized for size() + m.size()
                    // elements
  super.putAll(m);
}