Practice Lab: Movie Tracker
Task 1: The MovieRecord Class
Create a class MovieRecord to store movie data:
● Fields: String title, String genre, int rating (1-10 scale).
● Methods:
○ Constructor to initialize all fields.
○ Getters and setters.
○ toCSV(): returns a CSV string (title,genre,rating).
Task 2: Summing Ratings
Write a static method sumRatings that:
● Accepts an ArrayList<MovieRecord> and a genre.
● Returns the sum of ratings for movies in the given genre.
Task 3: Client-Server Communication
1. Client: Write a static method sendMoviesToServer:
○ Connects to a server on localhost port 9000.
○ Sends toCSV strings of movies from an ArrayList<MovieRecord> to the server.
○ Ends with "Done" and receives the count of movies sent as a string.
2. Server: Write a static method receiveMoviesFromClient:
○ Listens on port 9000.
○ Accepts connections and reads CSV movie data until "Done".
○ Returns an ArrayList<MovieRecord> and sends back the number of movies received.
Task 4: Mapping and Prioritizing Movies
1. Write a method genreMap:
○ Takes an ArrayList<MovieRecord> and returns a Map<String, Integer> where:
■ Key = genre.
■ Value = total ratings of all movies in that genre.
2. Create a PriorityQueue<MovieRecord>:
○ Prioritize movies by rating (higher ratings first).
○ Populate the queue with movies from an ArrayList<MovieRecord>.
Task 5: Multi-Threaded Movie Rating Aggregation
1. Create a class GenreRatingAggregator:
○ Fields: ArrayList<MovieRecord> movieList, String genre, int totalRating.
○ Implements Runnable and calculates the sum of ratings for its genre in run().
○ Provides a getter for totalRating.
2. In main:
○ Create two GenreRatingAggregator objects for two genres.
○ Use threads to execute them concurrently.
○ Wait for threads to finish and print the ratings for both genres.