neda/HW-03-oop-and-api
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neda
2026-07-19 05:33:55 +03:30
parent 5473658dc8
commit 253afe8097
4 changed files with 320 additions and 70 deletions
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src/main/java/Rational/Rational.java
+24 -23
View File
@@ -51,45 +51,46 @@ public class Rational {
return r1.add(r2);
}
// TODO: Instance method - this - other
// Formula: a/b - c/d = (a*d - c*b) / (b*d)
public Rational subtract(Rational other) {
// YOUR CODE HERE
return null; // Remove this line when implemented
int newNumerator = this.numerator * other.denominator
- other.numerator * this.denominator;
int newDenominator = this.denominator * other.denominator;
return new Rational(newNumerator, newDenominator);
}
// TODO: Static method - r1 - r2
public static Rational subtract(Rational r1, Rational r2) {
// YOUR CODE HERE
return null; // Remove this line when implemented
return r1.subtract(r2);
}
// TODO: Instance method - this * other
// Formula: (a/b) * (c/d) = (a*c) / (b*d)
public Rational multiply(Rational other) {
// YOUR CODE HERE
return null; // Remove this line when implemented
int newNumerator = this.numerator * other.numerator;
int newDenominator = this.denominator * other.denominator;
return new Rational(newNumerator, newDenominator);
}
// TODO: Static method - r1 * r2
public static Rational multiply(Rational r1, Rational r2) {
// YOUR CODE HERE
return null; // Remove this line when implemented
return r1.multiply(r2);
}
// TODO: Instance method - this / other
// Formula: (a/b) ÷ (c/d) = (a*d) / (b*c)
public Rational divide(Rational other) {
// YOUR CODE HERE
// HINT: Division is multiplication by reciprocal
// Don't forget to check if other.numerator is zero!
return null; // Remove this line when implemented
if (other.numerator == 0) {
throw new ArithmeticException("Cannot divide by zero");
}
int newNumerator = this.numerator * other.denominator;
int newDenominator = this.denominator * other.numerator;
return new Rational(newNumerator, newDenominator);
}
// TODO: Static method - r1 / r2
public static Rational divide(Rational r1, Rational r2) {
// YOUR CODE HERE
return null; // Remove this line when implemented
return r1.divide(r2);
}
// PROVIDED - String representation
src/main/java/movie/apis/Main.java
+19 -2
View File
@@ -21,17 +21,34 @@ 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: ");
movieService.displayMoviesByGenre(
genreId,
page
);
break;
case 3:
// TODO (BONUS): Get movie ID from user, then call movieService.displayMovieDetails()
Long movieId =
getLongInput("Enter movie ID: ");
movieService.displayMovieDetails(movieId);
break;
case 0:
running = false;
System.out.println("Goodbye!");
src/main/java/movie/apis/Movie.java
+97 -7
View File
@@ -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 +12,103 @@ public class Movie {
private String imdbRating;
private String country;
// TODO: Create a constructor with all fields
// TODO: Create a simple constructor with id and title only
public Movie(Long id, String title, List<Genre> genres,
String images, String year,
String imdbRating, String country) {
// TODO: Create getters and setters for all fields
this.id = id;
this.title = title;
this.genres = genres;
this.images = images;
this.year = year;
this.imdbRating = imdbRating;
this.country = country;
}
public Movie(Long id, String title) {
this.id = id;
this.title = title;
}
public Movie() {
}
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<Genre> getGenres() {
return genres;
}
public void setGenres(List<Genre> genres) {
this.genres = genres;
}
public String getImages() {
return images;
}
public void setImages(String images) {
this.images = images;
}
public String getYear() {
return year;
}
public void setYear(String year) {
this.year = year;
}
public String getImdbRating() {
return imdbRating;
}
public void setImdbRating(String imdbRating) {
this.imdbRating = imdbRating;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
@Override
public String toString() {
return id + ". " + title + " (" + year + ")";
}
}
src/main/java/movie/apis/MovieService.java
+180 -38
View File
@@ -61,7 +61,6 @@ public class MovieService {
}
public void displayGenres() {
String jsonResponse = getGenresList();
@@ -73,7 +72,8 @@ public class MovieService {
try {
JsonObject rootObject = JsonParser.parseString(jsonResponse).getAsJsonObject();
JsonArray genresArray = rootObject.getAsJsonArray("genres");
Type genreListType = new TypeToken<ArrayList<Genre>>(){}.getType();
Type genreListType = new TypeToken<ArrayList<Genre>>() {
}.getType();
Gson gson = new Gson();
List<Genre> genres = gson.fromJson(genresArray, genreListType);
@@ -89,26 +89,86 @@ public class MovieService {
/**
* TODO 1: Display movies for a specific genre and page
*
* <p>
* JSON format: { "movies": [ { "id": 1, "title": "Movie", "year": "1994" } ], "total": 177, "total_pages": 18 }
*
* <p>
* Steps:
* - Call getMoviesByGenreList(genreId, page) to get JSON
* - Parse JSON to JsonObject
* - Get "movies" array (NOT "data")
* - Loop through array and print: "ID: {id} | {title} ({year})"
* - Also print total and total_pages
*
* <p>
* PUT ALL PARSING CODE INSIDE try-catch
*/
public void displayMoviesByGenre(Long genreId, Long page) {
// TODO: Write your code here
// All parsing code must be inside try-catch
String jsonResponse = getMoviesByGenreList(genreId, page);
if (jsonResponse == null) {
System.out.println("Failed to get movies");
return;
}
try {
// Your code here
JsonObject rootObject =
JsonParser.parseString(jsonResponse)
.getAsJsonObject();
JsonArray moviesArray =
rootObject.getAsJsonArray("movies");
System.out.println("\nMOVIES:");
for (JsonElement element : moviesArray) {
JsonObject movie =
element.getAsJsonObject();
Long id =
movie.get("id").getAsLong();
String title =
movie.get("title").getAsString();
String year =
movie.has("year")
? movie.get("year").getAsString()
: "Unknown";
System.out.println(
"ID: " + id +
" | " + title +
" (" + year + ")"
);
}
System.out.println(
"\nTotal movies: "
+ rootObject.get("total").getAsInt()
);
System.out.println(
"Total pages: "
+ rootObject.get("total_pages").getAsInt()
);
} catch (Exception e) {
System.err.println("ERROR: " + e.getMessage());
System.err.println(
"ERROR: " + e.getMessage()
);
}
}
@@ -118,34 +178,65 @@ public class MovieService {
* 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;
try {
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();
} else {
System.out.println(
"HTTP error: "
+ response.statusCode()
);
}
} catch (Exception e) {
System.out.println("!!Exception : " + e.getMessage());
System.out.println(
"!!Exception : "
+ e.getMessage()
);
}
return null;
}
/**
* BONUS TODO: Display complete movie details for a given movie ID
*
* <p>
* Expected JSON format from getMovieById():
* {
* "id": 1,
* "title": "The Shawshank Redemption",
* "year": "1994",
* "genres": ["Crime", "Drama"],
* "poster": "https://moviesapi.ir/images/tt0111161_poster.jpg",
* "country": "USA",
* "imdb_rating": "9.3"
* "id": 1,
* "title": "The Shawshank Redemption",
* "year": "1994",
* "genres": ["Crime", "Drama"],
* "poster": "https://moviesapi.ir/images/tt0111161_poster.jpg",
* "country": "USA",
* "imdb_rating": "9.3"
* }
*
* <p>
* INSTRUCTIONS:
* 1. Call getMovieById(movieId) to get the JSON response
* 2. Check if response is null (if yes, print error and return)
@@ -153,7 +244,7 @@ public class MovieService {
* 4. Extract all fields: id, title, year, genres array, poster, country, imdb_rating
* 5. Convert genres array to comma-separated string
* 6. Print all movie details in a readable format
*
* <p>
* PUT ALL PARSING CODE INSIDE THE EXISTING try-catch
*
* @param movieId The ID of the movie to display
@@ -170,19 +261,70 @@ public class MovieService {
// Step 3-6: Parse JSON and display details (PUT YOUR CODE INSIDE try-catch)
try {
// TODO: Parse jsonResponse to JsonObject
// TODO: Extract id, title, year, genres array, poster, country, imdb_rating
// TODO: Convert genres array to a readable string
// TODO: Print all movie details
// HINT: Use JsonParser.parseString(jsonResponse).getAsJsonObject()
// HINT: Use getAsJsonArray("genres") to get genres
// HINT: For each genre, use getAsString()
// Your code here:
JsonObject movie =
JsonParser.parseString(jsonResponse)
.getAsJsonObject();
Long id =
movie.get("id").getAsLong();
String title =
movie.get("title").getAsString();
String year =
movie.get("year").getAsString();
String poster =
movie.get("poster").getAsString();
String country =
movie.get("country").getAsString();
String rating =
movie.get("imdb_rating").getAsString();
JsonArray genres =
movie.getAsJsonArray("genres");
StringBuilder genreText =
new StringBuilder();
for (JsonElement g : genres) {
if (genreText.length() > 0)
genreText.append(", ");
genreText.append(g.getAsString());
}
System.out.println("\n========== MOVIE DETAILS ==========");
System.out.println("ID: " + id);
System.out.println("Title: " + title);
System.out.println("Year: " + year);
System.out.println("Genres: " + genreText);
System.out.println("Poster: " + poster);
System.out.println("Country: " + country);
System.out.println("IMDB Rating: " + rating);
System.out.println("===================================");
} catch (Exception e) {
System.err.println("ERROR parsing movie details: " + e.getMessage());
System.err.println(
"ERROR parsing movie details: "
+ e.getMessage()
);
}
}
}
}