Assignment-3
This commit is contained in:
@@ -39,57 +39,58 @@ public class Rational {
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}
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}
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// COMPLETED - Instance method: this + other
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public Rational add(Rational other) {
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int newNumerator = this.numerator * other.denominator + other.numerator * this.denominator;
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int newDenominator = this.denominator * other.denominator;
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return new Rational(newNumerator, newDenominator);
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}
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// COMPLETED - Static method: r1 + r2
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public static Rational add(Rational r1, Rational r2) {
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return r1.add(r2);
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}
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// TODO: Instance method - this - other
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// Formula: a/b - c/d = (a*d - c*b) / (b*d)
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public Rational subtract(Rational other) {
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// YOUR CODE HERE
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return null; // Remove this line when implemented
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int newNumerator = this.numerator * other.denominator - other.numerator * this.denominator;
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int newDenominator = this.denominator * other.denominator;
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return new Rational(newNumerator, newDenominator);
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}
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// TODO: Static method - r1 - r2
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public static Rational subtract(Rational r1, Rational r2) {
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// YOUR CODE HERE
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return null; // Remove this line when implemented
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return r1.subtract(r2);
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}
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// TODO: Instance method - this * other
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// Formula: (a/b) * (c/d) = (a*c) / (b*d)
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public Rational multiply(Rational other) {
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// YOUR CODE HERE
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return null; // Remove this line when implemented
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int newNumerator = this.numerator * other.numerator;
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int newDenominator = this.denominator * other.denominator;
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return new Rational(newNumerator, newDenominator);
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}
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// TODO: Static method - r1 * r2
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public static Rational multiply(Rational r1, Rational r2) {
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// YOUR CODE HERE
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return null; // Remove this line when implemented
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return r1.multiply(r2);
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}
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// TODO: Instance method - this / other
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// Formula: (a/b) ÷ (c/d) = (a*d) / (b*c)
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public Rational divide(Rational other) {
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// YOUR CODE HERE
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// HINT: Division is multiplication by reciprocal
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// Don't forget to check if other.numerator is zero!
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return null; // Remove this line when implemented
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if (other.denominator == 0) {
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throw new IllegalArgumentException("Denominator cannot be zero");
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}
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int newNumerator = this.numerator * other.denominator;
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int newDenominator = this.denominator * other.numerator;
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return new Rational(newNumerator, newDenominator);
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}
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// TODO: Static method - r1 / r2
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public static Rational divide(Rational r1, Rational r2) {
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// YOUR CODE HERE
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return null; // Remove this line when implemented
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return r1.divide(r2);
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}
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// PROVIDED - String representation
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@@ -21,15 +21,20 @@ public class Main {
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break;
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case 2:
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// TODO: Get genre ID and page from user, then call movieService.displayMoviesByGenre()
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System.out.print("Enter genre id: ");
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long genreId = scanner.nextLong();
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System.out.print("Enter page: ");
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long page = scanner.nextLong();
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scanner.nextLine();
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movieService.displayMoviesByGenre(genreId, page);
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break;
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case 3:
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// TODO (BONUS): Get movie ID from user, then call movieService.displayMovieDetails()
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System.out.print("Enter movie id: ");
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long movieId = scanner.nextLong();
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scanner.nextLine();
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movieService.displayMovieDetails(movieId);
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break;
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case 0:
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@@ -39,13 +44,13 @@ public class Main {
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break;
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default:
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System.out.println("Invalid choice! Please enter 0-4");
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System.out.println("Invalid choice! Please enter 0-3");
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}
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if (running) {
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System.out.println("\nPress Enter to continue...");
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scanner.nextLine();
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scanner.nextLine();
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//scanner.nextLine();
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}
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}
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@@ -15,10 +15,195 @@ public class Movie {
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private String year;
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private String imdb_rating;
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private String country;
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private String actors;
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private String awards;
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private String director;
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private String imdb_id;
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private String imdb_votes;
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private String metascore;
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private String plot;
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private String rated;
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private String released;
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private String runtime;
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private String type;
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private String writer;
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// TODO: Create a constructor with all fields
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public Movie(Long id, String title, List<String> genres, List<String> images, String year, String imdb_rating, String country, String actors, String awards, String director, String imdb_id, String imdb_votes, String metascore, String plot, String rated, String released, String runtime, String type, String writer) {
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this.id = id;
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this.title = title;
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this.genres = genres;
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this.images = images;
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this.year = year;
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this.imdb_rating = imdb_rating;
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this.country = country;
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this.actors = actors;
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this.awards = awards;
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this.director = director;
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this.imdb_id = imdb_id;
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this.imdb_votes = imdb_votes;
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this.metascore = metascore;
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this.plot = plot;
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this.rated = rated;
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this.released = released;
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this.runtime = runtime;
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this.type = type;
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this.writer = writer;
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}
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// TODO: Create a simple constructor with id and title only
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public Movie(Long id, String title) {
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this.id = id;
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this.title = title;
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}
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// TODO: Create getters and setters for all fields
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public List<String> getGenres() {
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return genres;
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}
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public void setGenres(List<String> genres) {
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this.genres = genres;
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}
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public List<String> getImages() {
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return images;
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}
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public void setImages(List<String> images) {
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this.images = images;
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}
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public String getYear() {
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return year;
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}
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public void setYear(String year) {
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this.year = year;
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}
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public String getImdb_rating() {
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return imdb_rating;
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}
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public void setImdb_rating(String imdb_rating) {
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this.imdb_rating = imdb_rating;
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}
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public String getCountry() {
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return country;
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}
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public void setCountry(String country) {
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this.country = country;
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}
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public String getActors() {
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return actors;
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}
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public void setActors(String actors) {
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this.actors = actors;
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}
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public String getAwards() {
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return awards;
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}
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public void setAwards(String awards) {
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this.awards = awards;
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}
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public String getDirector() {
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return director;
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}
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public void setDirector(String director) {
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this.director = director;
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}
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public String getImdb_id() {
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return imdb_id;
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}
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public void setImdb_id(String imdb_id) {
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this.imdb_id = imdb_id;
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}
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public String getImdb_votes() {
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return imdb_votes;
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}
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public void setImdb_votes(String imdb_votes) {
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this.imdb_votes = imdb_votes;
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}
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public String getMetascore() {
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return metascore;
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}
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public void setMetascore(String metascore) {
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this.metascore = metascore;
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}
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public String getPlot() {
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return plot;
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}
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public void setPlot(String plot) {
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this.plot = plot;
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}
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public String getRated() {
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return rated;
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}
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public void setRated(String rated) {
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this.rated = rated;
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}
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public String getReleased() {
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return released;
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}
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public void setReleased(String released) {
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this.released = released;
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}
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public String getRuntime() {
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return runtime;
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}
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public void setRuntime(String runtime) {
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this.runtime = runtime;
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}
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public String getType() {
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return type;
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}
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public void setType(String type) {
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this.type = type;
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}
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public String getWriter() {
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return writer;
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}
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public void setWriter(String writer) {
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this.writer = writer;
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}
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}
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@@ -87,26 +87,28 @@ public class MovieService {
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}
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}
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/**
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* TODO 1: Display movies for a specific genre and page
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*
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* Open this link in your browser (and check Pretty-print checkbox) to view json format:
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* https://api.meshcomp.ir/api/v1/genres/1/movies
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*
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* Steps:
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* - Call getMoviesByGenreList(genreId, page) to get JSON
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* - Parse JSON to JsonObject
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* - Get "movies" array (NOT "data")
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* - Loop through array and print: "ID: {id} | {title} ({year})"
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* - Also print total and total_pages
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*
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* PUT ALL PARSING CODE INSIDE try-catch
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*/
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public void displayMoviesByGenre(Long genreId, Long page) {
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// TODO: Write your code here
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// All parsing code must be inside try-catch
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try {
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// Your code here
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String jsonResponse = getMoviesByGenreList(genreId, page);
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if (jsonResponse == null) {return;}
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JsonObject rootObject = JsonParser.parseString(jsonResponse).getAsJsonObject();
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JsonArray moviesArray = rootObject.getAsJsonArray("movies");
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if (moviesArray == null || moviesArray.size() == 0) {
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System.out.println("No movies found for this genre/page.");
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return;
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}
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for (int i = 0; i < moviesArray.size(); i++) {
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JsonObject m = moviesArray.get(i).getAsJsonObject();
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System.out.println("ID: " + m.get("id").getAsLong() + " | " + m.get("title").getAsString() + " (" + m.get("year").getAsString() + ")");
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}
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System.out.println("Total Movies: " + rootObject.get("total").getAsString());
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System.out.println("Total Pages: " + rootObject.get("total_pages").getAsString());
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} catch (Exception e) {
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System.err.println("ERROR: " + e.getMessage());
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@@ -114,44 +116,21 @@ public class MovieService {
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}
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/**
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* BONUS: Fetch movie details from API using movie ID
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* URL format: https://api.meshcomp.ir/api/v1/movies/{movieId}
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*/
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private String getMovieById(Long movieId) {
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try {
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// TODO: Complete this method
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// String url = MOVIE_BY_ID_URL + movieId;
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// HttpRequest request = HttpRequest.newBuilder().uri(URI.create(url)).build();
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// HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
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// if (response.statusCode() == 200) return response.body();
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return null;
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String url = MOVIE_BY_ID_URL + movieId;
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HttpRequest request = HttpRequest.newBuilder().uri(URI.create(url)).build();
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HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
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if (response.statusCode() == 200) {
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return response.body();
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}
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} catch (Exception e) {
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System.out.println("!!Exception : " + e.getMessage());
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}
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return null;
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}
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/*
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BONUS TODO: Display complete movie details for a given movie ID
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Open this link in your browser (and check Pretty-print checkbox) to view json format:
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https://api.meshcomp.ir/api/v1/movies/1
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INSTRUCTIONS:
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1. Call getMovieById(movieId) to get the JSON response string
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2. Check if response is null (if yes, print error and return)
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3. Parse the JSON string to JsonObject (inside try-catch)
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4. Use Gson to extract all fields from the JSON and map them to your Movie class:
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- Add missing JSON fields to your Movie class first (actors, awards, director,
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imdb_id, imdb_votes, metascore, plot, rated, released, runtime, type, writer)
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- Then use Gson to parse your json string
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5. Print all movie details in a readable format
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(PUT ALL PARSING CODE INSIDE THE EXISTING try-catch)
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*/
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/* EXAMPLE OUTPUT:
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=======================================================================
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@@ -171,20 +150,35 @@ public class MovieService {
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*/
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public void displayMovieDetails(Long movieId) {
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// Step 1: Get JSON response from API
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String jsonResponse = getMovieById(movieId);
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// Step 2: Check if we got valid data
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// Step 3-5: Parse JSON and display details (PUT YOUR CODE INSIDE try-catch)
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if (jsonResponse == null) {
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System.out.println("Failed to get movie details for ID: " + movieId);
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return;
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}
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try {
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// TODO: Parse jsonResponse to JsonObject
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// HINT: Use JsonParser.parseString(jsonResponse).getAsJsonObject()
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// TODO: use Gson to parse the json
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// Your code here:
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JsonObject movieJson = JsonParser.parseString(jsonResponse).getAsJsonObject();
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Gson gson = new Gson();
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Movie movie = gson.fromJson(movieJson, Movie.class);
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String genreString = (movie.getGenres() != null) ? String.join(", ", movie.getGenres()) : "N/A";
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System.out.println("\n=======================================================================");
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System.out.println(" " + movie.getTitle().toUpperCase() + " (" + movie.getYear() + ")");
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System.out.println("=======================================================================");
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System.out.println("Rating: " + movie.getImdb_rating() + "/10 | Votes: " + movie.getImdb_votes());
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System.out.println("Director: " + movie.getDirector());
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System.out.println("Cast: " + movie.getActors());
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System.out.println("Genre: " + genreString);
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System.out.println("Runtime: " + movie.getRuntime() + " | Rated: " + movie.getRated());
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System.out.println("Country: " + movie.getCountry() + " | Released: " + movie.getReleased());
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System.out.println("Plot: " + movie.getPlot());
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System.out.println("Awards: " + movie.getAwards());
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System.out.println("=======================================================================");
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} catch (Exception e) {
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System.err.println("ERROR parsing movie details: " + e.getMessage());
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}
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Block a user