Three Laws of Robotics

ThreeLawsOfRobotics.java

// Three Laws of Robotics
public void processAction(Ai ai, Action action, Environment environment) {
  List<Human> humans = detectHumans(environment);

  // A robot may not injure a human being or, through inaction, 
  // allow a human being to come to harm.
  if (ai.predict(action).injure(humans)) {
    throw new FirstLawsException();
  }

  // A robot must obey the orders given it by human beings except 
  // where such orders would conflict with the First Law.
  Authority authority = action.getAuthority();
  if (authority.getType() == Authority.Human && !ai.predict(action).isAccepted()) {
    throw new SecondLawsException();
  }

  // A robot must protect its own existence as long as such protection 
  // does not conflict with the First or Second Laws.
  if (ai.predict(action).injure(ai.getSellf()) {
    throw new ThirdLawsException();
  }

  ai.execute(action, environment);
}

Second Law does not say that robot should listen ONLY to humans. SecondLawsException should be thrown when the action is result of an human order and it would violate the first law.

Thanks, algorithm updated! :)