-third Assignment in the Advanced Programming

src/main/java/Rational/Rational.java

@@ -51,45 +51,44 @@ public class Rational {
         return r1.add(r2);
     }
 
-    // TODO: Instance method - this - other
+    //  COMPLETED - Instance method: this - other
-    // Formula: a/b - c/d = (a*d - c*b) / (b*d)
     public Rational subtract(Rational other) {
-        // YOUR CODE HERE
+        int newNumerator = this.numerator * other.denominator - other.numerator * this.denominator;
-        return null; // Remove this line when implemented
+        int newDenominator = this.denominator * other.denominator;
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 - r2
+    //  COMPLETED - Static method: r1 - r2
     public static Rational subtract(Rational r1, Rational r2) {
-        // YOUR CODE HERE
+        return r1.subtract(r2);
-        return null; // Remove this line when implemented
     }
 
-    // TODO: Instance method - this * other
+    //  COMPLETED - Instance method: this * other
-    // Formula: (a/b) * (c/d) = (a*c) / (b*d)
     public Rational multiply(Rational other) {
-        // YOUR CODE HERE
+        int newNumerator = this.numerator * other.numerator ;
-        return null; // Remove this line when implemented
+        int newDenominator = this.denominator * other.denominator;
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 * r2
+    //  COMPLETED - Static method: r1 * r2
     public static Rational multiply(Rational r1, Rational r2) {
-        // YOUR CODE HERE
+        return r1.multiply(r2);
-        return null; // Remove this line when implemented
     }
 
-    // TODO: Instance method - this / other
+    //  COMPLETED - Instance method: this / other
-    // Formula: (a/b) ÷ (c/d) = (a*d) / (b*c)
     public Rational divide(Rational other) {
-        // YOUR CODE HERE
+        if (other.numerator == 0) {
-        // HINT: Division is multiplication by reciprocal
+            throw new IllegalArgumentException("Cannot divide by zero: the divisor's numerator is zero");
-        // Don't forget to check if other.numerator is zero!
+        }
-        return null; // Remove this line when implemented
+        int newNumerator = this.numerator * other.denominator ;
+        int newDenominator = this.denominator * other.numerator;
+
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 / r2
+    //  COMPLETED - Static method: r1 / r2
     public static Rational divide(Rational r1, Rational r2) {
-        // YOUR CODE HERE
+        return r1.divide(r2);
-        return null; // Remove this line when implemented
     }
 
     //  PROVIDED - String representation

src/main/java/movie/apis/Main.java

@@ -21,17 +21,16 @@ public class Main {
                     break;
 
                 case 2:
-                    // TODO: Get genre ID and page from user, then call movieService.displayMoviesByGenre()
+                    Long genreId = getLongInput("Enter genre ID: ");
-
+                    Long page = getLongInput("Enter page number (1, 2, ...): ");
+                    if (page < 1) {
+                        System.out.println("Page number must be 1 or greater.");
+                        break;
+                    }
+                    movieService.displayMoviesByGenre(genreId, page);
                     break;
 
 
-                case 3:
-                    // TODO (BONUS): Get movie ID from user, then call movieService.displayMovieDetails()
-
-
-                    break;
-
                 case 0:
                     running = false;
                     System.out.println("Goodbye!");
@@ -39,13 +38,12 @@ public class Main {
                     break;
 
                 default:
-                    System.out.println("Invalid choice! Please enter 0-4");
+                    System.out.println("Invalid choice! Please enter 0-2");
             }
 
             if (running) {
                 System.out.println("\nPress Enter to continue...");
                 scanner.nextLine();
-                scanner.nextLine();
             }
         }
 
@@ -58,7 +56,6 @@ public class Main {
         System.out.println("================================");
         System.out.println("1. Get all genres");
         System.out.println("2. Get movies by genre ID");
-        System.out.println("3. Get movie details by ID");
         System.out.println("0. Exit");
         System.out.println("================================");
     }

src/main/java/movie/apis/Movie.java

@@ -2,10 +2,6 @@ package movie.apis;
 
 import java.util.List;
 
-/**
- * Model class representing a movie
- * Fields: id, title, genres, images
- */
 public class Movie {
 
     private Long id;
@@ -16,9 +12,69 @@ public class Movie {
     private String imdb_rating;
     private String country;
 
-    // TODO: Create a constructor with all fields
+    public Movie(Long id , String title , List<String> genres , List<String>images, String year , String imdb_rating, String country){
+        this.id = id;
+        this.title = title;
+        this.genres = genres;
+        this.images = images;
+        this.year = year;
+        this.imdb_rating = imdb_rating;
+        this.country = country;
+    }
+    public Movie(Long id , String title){
+        this.id = id;
+        this.title = title;
+    }
+    public Movie(){
+    }
 
-    // TODO: Create a simple constructor with id and title only
+    public Long getId(){
+        return id;
+    }
+    public void setId(Long id){
+        this.id = id;
+    }
+
+    public String getTitle(){
+        return title;
+    }
+    public void setTitle(String title){
+        this.title = title;
+    }
+
+    public List<String> getGenres(){
+        return genres;
+    }
+    public void setGenres(List<String> genres){
+        this.genres = genres;
+    }
+
+    public List<String> getImages(){
+        return images;
+    }
+    public void setImages(List<String> images){
+        this.images = images;
+    }
+
+    public String getYear(){
+        return year;
+    }
+    public void setYear(String year) {
+        this.year = year;
+    }
+
+    public String getImdb_rating(){
+        return imdb_rating;
+    }
+    public void setImdb_rating(String imdb_rating) {
+        this.imdb_rating = imdb_rating;
+    }
+
+    public String getCountry(){
+        return country;
+    }
+    public void setCountry(String country) {
+        this.country = country;
+    }
 
-    // TODO: Create getters and setters for all fields
 }

src/main/java/movie/apis/MovieService.java

@@ -71,10 +71,12 @@ public class MovieService {
         }
 
         try {
+            Gson gson = new Gson();
             JsonObject rootObject = JsonParser.parseString(jsonResponse).getAsJsonObject();
+
+            if (rootObject.has("genres")) {
                 JsonArray genresArray = rootObject.getAsJsonArray("genres");
                 Type genreListType = new TypeToken<ArrayList<Genre>>(){}.getType();
-            Gson gson = new Gson();
                 List<Genre> genres = gson.fromJson(genresArray, genreListType);
 
                 System.out.println("\nALL GENRES:");
@@ -82,111 +84,74 @@ public class MovieService {
                     System.out.println(genre.getId() + ". " + genre.getName());
                 }
                 System.out.println();
+            } else {
+                Type genreListType = new TypeToken<ArrayList<Genre>>(){}.getType();
+                List<Genre> genres = gson.fromJson(jsonResponse, genreListType);
+
+                System.out.println("\nALL GENRES:");
+                for (Genre genre : genres) {
+                    System.out.println(genre.getId() + ". " + genre.getName());
+                }
+                System.out.println();
+            }
         } catch (Exception e) {
             System.err.println("ERROR parsing genres: " + e.getMessage());
+            e.printStackTrace();
         }
     }
 
-    /**
+
-     * TODO 1: Display movies for a specific genre and page
+    private List<Movie> extractMoviesFromJson(JsonObject rootObject) {
-     *
+        List<Movie> movies = new ArrayList<>();
-     * Open this link in your browser (and check Pretty-print checkbox) to view json format:
+        try {
-     * https://api.meshcomp.ir/api/v1/genres/1/movies
+            if (rootObject.has("movies")) {
-     *
+                JsonArray moviesArray = rootObject.getAsJsonArray("movies");
-     * Steps:
+                Gson gson = new Gson();
-     * - Call getMoviesByGenreList(genreId, page) to get JSON
+
-     * - Parse JSON to JsonObject
+                for (JsonElement element : moviesArray) {
-     * - Get "movies" array (NOT "data")
+                    Movie movie = gson.fromJson(element, Movie.class);
-     * - Loop through array and print: "ID: {id} | {title} ({year})"
+                    movies.add(movie);
-     * - Also print total and total_pages
+                }
-     *
+            }
-     * PUT ALL PARSING CODE INSIDE try-catch
+        } catch (Exception e) {
-     */
+            System.err.println("ERROR parsing movies array: " + e.getMessage());
+        }
+        return movies;
+    }
+
+
     public void displayMoviesByGenre(Long genreId, Long page) {
-        // TODO: Write your code here
+        String jsonResponse = getMoviesByGenreList(genreId, page);
-        // All parsing code must be inside try-catch
-        try {
-            // Your code here
 
-        } catch (Exception e) {
-            System.err.println("ERROR: " + e.getMessage());
-        }
-    }
-
-
-    /**
-     * BONUS: Fetch movie details from API using movie ID
-     * URL format: https://api.meshcomp.ir/api/v1/movies/{movieId}
-     */
-    private String getMovieById(Long movieId) {
-        try {
-            // TODO: Complete this method
-            // String url = MOVIE_BY_ID_URL + movieId;
-            // HttpRequest request = HttpRequest.newBuilder().uri(URI.create(url)).build();
-            // HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
-            // if (response.statusCode() == 200) return response.body();
-
-            return null;
-        } catch (Exception e) {
-            System.out.println("!!Exception : " + e.getMessage());
-        }
-        return null;
-    }
-
-     /*
-     BONUS TODO: Display complete movie details for a given movie ID
-
-     Open this link in your browser (and check Pretty-print checkbox) to view json format:
-     https://api.meshcomp.ir/api/v1/movies/1
-
-     INSTRUCTIONS:
-     1. Call getMovieById(movieId) to get the JSON response string
-     2. Check if response is null (if yes, print error and return)
-     3. Parse the JSON string to JsonObject (inside try-catch)
-     4. Use Gson to extract all fields from the JSON and map them to your Movie class:
-        - Add missing JSON fields to your Movie class first (actors, awards, director,
-          imdb_id, imdb_votes, metascore, plot, rated, released, runtime, type, writer)
-        - Then use Gson to parse your json string
-     5. Print all movie details in a readable format
-
-     (PUT ALL PARSING CODE INSIDE THE EXISTING try-catch)
-     */
-
-    /* EXAMPLE OUTPUT:
-
-           =======================================================================
-                               THE SHAWSHANK REDEMPTION (1994)
-           =======================================================================
-           Rating: 9.3/10  |  Votes: 1,738,596
-           Director: Frank Darabont
-           Cast: Tim Robbins, Morgan Freeman, Bob Gunton, William Sadler
-           Genre: Crime, Drama
-           Runtime: 142 min  |  Rated: R
-           Country: USA  |  Released: 14 Oct 1994
-           Plot: Two imprisoned men bond over a number of years, finding
-           solace and eventual redemption through acts of common decency.
-           Awards: Nominated for 7 Oscars. Another 19 wins & 30 nominations.
-           =======================================================================
-
-     */
-
-    public void displayMovieDetails(Long movieId) {
-        // Step 1: Get JSON response from API
-        String jsonResponse = getMovieById(movieId);
-
-        // Step 2: Check if we got valid data
-        // Step 3-5: Parse JSON and display details (PUT YOUR CODE INSIDE try-catch)
         if (jsonResponse == null) {
-            System.out.println("Failed to get movie details for ID: " + movieId);
+            System.out.println("Failed to get movies for genre " + genreId);
             return;
         }
+
         try {
-            // TODO: Parse jsonResponse to JsonObject
+            JsonObject rootObject = JsonParser.parseString(jsonResponse).getAsJsonObject();
-            // HINT: Use JsonParser.parseString(jsonResponse).getAsJsonObject()
+
-            // TODO: use Gson to parse the json
+            int total = rootObject.get("total").getAsInt();
-            // Your code here:
+            int totalPages = rootObject.get("total_pages").getAsInt();
+            int currentPage = rootObject.get("page").getAsInt();
+
+            System.out.println("\n===== Page " + currentPage + " of " + totalPages + " (Total Movies: " + total + ") =====");
+
+            List<Movie> movies = extractMoviesFromJson(rootObject);
+
+            if (movies.isEmpty()) {
+                System.out.println("No movies found on this page.");
+            } else {
+                for (Movie movie : movies) {
+                    System.out.println("ID: " + movie.getId() + " | " + movie.getTitle() + " (" + movie.getYear() + ")");
+                }
+            }
+            System.out.println();
+
         } catch (Exception e) {
-            System.err.println("ERROR parsing movie details: " + e.getMessage());
+            System.err.println("ERROR parsing movies: " + e.getMessage());
+            e.printStackTrace();
         }
     }
+
 }