Third Assignment: Movie Explorer 🎬 + Rational Calculator 🧮

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Welcome to Your Third Assignment in the Advanced Programming Course!

This assignment consists of two separate parts. You must complete both parts.

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Part 1: Rational Class (Rational Numbers)

In this part, you will implement a Rational class that supports basic mathematical operations.

A RationalTest class is provided. +You can run it to verify that your implementation works correctly. +Use it to test your logic before submitting.

Tasks: Define fields for numerator and denominator

Implement addition, subtraction, multiplication, and division as instance methods

Implement addition, subtraction, multiplication, and division as static methods

Note: Detailed TODO comments are provided inside Rational.java. Do NOT modify the constructor, simplify logic, or completed methods. Only complete the TODO methods.

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Part 2: Movie Explorer 🎬 (Using API)

In this part, you will develop a Java application that fetches movie data from an API and allows users to browse and search movies.

Files Provided

• Movie.java
• Genre.java
• MovieService.java
• Main.java

The Genre class is already implemented as a sample. You must design and implement the Movie class yourself (fields, constructors, getters, setters, toString if needed).

We have already implemented two methods that call the API and return the raw JSON response as a String:

• getGenresList() → calls the API and returns the list of genres in JSON format.
• getMoviesByGenreList(Long genreId, Long page) → calls the API and returns the list of movies for a specific genre and page in JSON format.

Do NOT modify: API URLs getGenresList() getMoviesByGenreList()

Only complete the TODO methods.

Your Tasks

1. Complete the Movie class (fields, constructor, getters, and setters).

2. Write a method that receives the JSON string returned by getMoviesByGenreList() and converts it into a List<Movie>.

3. Write another method that displays the list of movies (for the selected genre) in a clean and readable format.

4. Implement a console menu in Main that allows the user to:

   • View the list of genres
   • Select a genre
   • View movies for the selected genre (with pagination) After completing MovieService, you must also complete the Main class so the menu works correctly.

Note

To understand what fields should exist in the Genre and Movie classes, it is recommended that you first call the two API methods once and inspect the raw JSON response. This will help you determine the exact structure of the data and define the appropriate class fields. We implemented JSON parsing using Gson in the project. However, the Jackson dependency is also included. If you prefer, you are allowed to use Jackson instead of Gson.

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Objectives ✏️

By completing this assignment, you will:

Reinforce OOP concepts: class design, constructors, encapsulation, collections

Practice instance methods vs. static methods

Work with JSON parsing and REST APIs

Design a simple console-based menu

Improve Git workflow and project management

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Prerequisites ✅

Git

Java (version 23 or 25)

Maven as a package manager

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Tasks Summary 📝

Fork the repository and clone it locally

Create and switch to a development branch

Complete Part 1 (Rational.java) following the TODO comments

Complete Part 2 (Movie.java, Genre.java, MovieService.java, Main.java) following the TODO comments

Ensure the code compiles and runs correctly

Commit and push regularly

Submit a pull request from development to main

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Evaluation Criteria ⚖️

Functionality: Code compiles and runs without errors; all features work correctly

Code Quality: Clean, readable, well-structured code with proper naming

Understanding: You must be able to explain your implementation

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Bonus Tasks ✒️

1. Fetch and display movie information using movie ID

In this section, you must implement the ability to search for a movie by its ID. The user enters an ID, and the program displays complete movie details.

Movie Class Fields (already defined):

• id (Long) - Movie identifier

• title (String) - Movie title

• year (String) - Release year

• genres (List) - List of genres

• images (String) - Poster image URL

• country (String) - Production country

• imdbRating (String) - IMDB rating

Implementation Steps:

• Build and Send Request (getMovieById method):

  - Create HTTP request to: https://api.meshcomp.ir/api/v1/movies/{movieId}
  
  - Replace {movieId} with the ID from user
  
  - Send request and get response
  

• Handle Response (getMovieById method):

  - If status code is 200, return JSON body
  
  - Otherwise, print error and return null
  

• Parse JSON and Create Movie Object (displayMovieDetails method):

  - Parse JSON response to JsonObject
  
  - Extract all fields: id, title, year, poster, country, imdb_rating
  
  - Parse "genres" array and convert each to Genre object
  
  - Create a Movie object with all extracted data
  

• Display Results (displayMovieDetails method):

  - Print all movie details in a clean format
  

2. Advanced search (title, genre, year, rating, etc.)

3. Sorting options for movies

4. Save/load favorite movies to/from a file

5. Improved console menu design

6. GUI version using JavaFX

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References 📚

API (Replace placeholders with numbers):

• genres: https://api.meshcomp.ir/api/v1/genres
• movies: https://api.meshcomp.ir/api/v1/movies
• movies (specifying the page): https://api.meshcomp.ir/api/v1/movies?page={pageId}
• movies by genres: https://api.meshcomp.ir/api/v1/genres/{genreId}/movies?page={pageId}
• details of a specific movie: https://api.meshcomp.ir/api/v1/movies/{movieId}

Video Tutorials (watch before starting the assignment): link

Gson Tutorial: Gson Reading and Parsing Data from a JSONObject

Jackson Tutorial: Jackson Parsing Json in Java Tutorial - Part 1 Jackson and Simple Objects

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Submission ⌛

Deadline: May 1st (11 Ordibehesht)