what does these lines do ? private Game mGame; public Prompter(Game game) { mGame = game;

  /* This is a member field (variable) even though it is using an object type to reference a Game object. It is important to   
    * remember that in Java, no variable can ever hold an object. A variable can only hold a reference to an object. This means 
    * that mGame can hold the memory address of an instantiated Game object. This is different than the primitive data 
    * types like int, double, etc. Those can hold actual values (i.e  private int numCars = 3; ). 
    */
   private Game mGame;   

 /* This is the constructor for the Prompter class that is called upon instantiation of a prompter obj. Notice that it is passing a
   * reference to a Game object named game. Again, this is a reference only. Therefore, mGame gets assigned the memory 
   * address of game. This is not a good practice because it violates encapsulation. mGame was set as a private field, but since 
   * the memory address was passed by reference to the constructor, any changes to the game object outside the Prompter 
   * object will still change for mGame inside it as well because both variables are essentially referencing the same object.
   */
  public Prompter(Game game) {        
    mGame = game;
}