Question

Using Java

Create a class named Movie that can be used in your video rental business. The Movie class should track the Motion Picture Association of America (MPAA) rating (e.g., Rated G, PG-13, R), ID Number, and movie title with appropriate accessor and mutator methods. Also create an equals() method that overrides Object ’s equals() method, where two movies are equal if their ID number is identical.

Next, create three additional classes named Action, Comedy, and Drama that are derived from Movie. To demonstrate polymorphism:

• create a method named calcLateFees in Movie which takes as an input the number of days a movie is late, and returns the late fee for that movie (the default late fee is $2/day).
• in each of three sub-classes, override the calcLateFees method (Action movies have a late fee of $3/day, Comedy movies are $2.50/day, and Drama movies are $2/day).

Test your program using several different objects derived from the Movie class – at least one of each derived type -- to ensure that everything works properly.

Answer 1

Code - Main.java

class Movie
{
   private String movieRating;
   private int movieID;
   private String movieTitle;

   public Movie()
   {
       movieRating = "";
       movieID = 0;
       movieTitle = "";
   }

   public Movie(String movRating, int movID, String movTitle)
   {
       movieRating = movRating;
       movieID = movID;
       movieTitle = movTitle;
   }

   public String getMovieRating()
   {
       return movieRating;
   }

   public void setMovieRating(String movRating)
   {
       movieRating = movRating;
   }

   public int getMovieID()
   {
       return movieID;
   }

   public void setMovieID(int movID)
   {
       movieID = movID;
   }

   public String getMovieTitile()
   {
       return movieTitle;
   }

   public void setMovieTitile(String movTitle)
   {
       movieTitle = movTitle;
   }

   public double calcMovieFees(int days)
   {
       return 2.0 * days;
   }

   public boolean equals(Object movObj)
   {
       if(movObj == null)
           return false;
       else if(getClass() != movObj.getClass())
           return false;
       else
       {
           Movie other = (Movie)movObj;

           return (movieRating.equals(other.movieRating) && movieID == other.movieID
                   && movieTitle.equals(other.movieTitle));
       }
   }

   public String toString()
   {
       return "\nMPAA Rating: " + movieRating + "\nID Number: " + movieID
               + "\nMovie Title: " + movieTitle;
   }
}
// Action.java
class Action extends Movie
{
   public Action()
   {
       super();
   }

   public Action(String movRating, int movID, String movTitle)
   {
       super(movRating, movID, movTitle);
   }
  
   public double calcMovieFees(int days)
   {
       return 3.0 * days;
   }
}
// Comedy.java
class Comedy extends Movie
{
   public Comedy()
   {
       super();
   }

   public Comedy(String movRating, int movID, String movTitle)
   {
       super(movRating, movID, movTitle);
   }

   public double calcMovieFees(int days)
   {
       return 2.5 * days;
   }
}
// Drama.java
class Drama extends Movie
{
   public Drama()
   {
       super();
   }

   public Drama(String movRating, int movID, String movTitle)
   {
       super(movRating, movID, movTitle);
   }
  
   public double calcMovieFees(int days)
   {
       return 2.0 * days;
   }
}
// MovieTest.java
public class Main
{
   public static void main(String[] args)
   {
       Movie movie = new Movie("PG-13", 6589, "Baby Day Out");
       Action actionMovie = new Action("G", 5946, "Mission Impossible");
       Comedy comedyMovie = new Comedy("R", 3584, "Dictator");
       Drama dramaMovie = new Drama("PG-13", 4865, "Avengers");

       System.out.println(movie);
       System.out.println("Late Fee: $" + movie.calcMovieFees(6));

       System.out.println(actionMovie);
       System.out
               .println("Late Fee: $" + actionMovie.calcMovieFees(6));

       System.out.println(comedyMovie);
       System.out
               .println("Late Fee: $" + comedyMovie.calcMovieFees(6));

       System.out.println(dramaMovie);
       System.out.println("Late Fee: $" + dramaMovie.calcMovieFees(6));
   }
}

Screenshots -

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