Someone

public void playerWithHighestPoints()
{
  Collection<Player> col = allPlayers.values();
  Player playerWithHighestPoints = null;
  for(Player temp: col)
  {
    if(playerWithHighestPoints == null || temp.getPoints() > playerWithHighestPoints.getPoints())
    {            
      playerWithHighestPoints = temp;
    }
  }
  System.out.println(playerWithHighestPoints.toString());            
}