neda/HW-03-oop-and-api
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Partow
2026-04-24 15:43:05 +03:30
parent 9b074cfdf0
commit 158a504a33
6 changed files with 410 additions and 45 deletions
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pom.xml
+15
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@@ -13,5 +13,20 @@
<maven.compiler.target>23</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- GSON: Google JSON parsing library -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.11.0</version>
</dependency>
<!-- Jackson: Another JSON parsing library -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.17.2</version>
</dependency>
</dependencies>
</project>
src/main/java/Rational/RationalTest.java
+108
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@@ -0,0 +1,108 @@
package Rational;
public class RationalTest {
public static void main(String[] args) {
System.out.println("=== Testing Rational Operations ===\n");
// Create some rational numbers
Rational r1 = new Rational(1, 2); // 1/2
Rational r2 = new Rational(1, 3); // 1/3
Rational r3 = new Rational(3, 4); // 3/4
Rational r4 = new Rational(2, 5); // 2/5
Rational r5 = new Rational(5, 1); // 5 (integer)
System.out.println("Created rational numbers:");
System.out.println("r1 = " + r1);
System.out.println("r2 = " + r2);
System.out.println("r3 = " + r3);
System.out.println("r4 = " + r4);
System.out.println("r5 = " + r5);
System.out.println();
// Test ADDITION
System.out.println("=== ADDITION ===");
System.out.println("Instance method - r1 + r2 = " + r1.add(r2));
System.out.println("Static method - Rational.add(r1, r2) = " + Rational.add(r1, r2));
System.out.println("Expected: 1/2 + 1/3 = 5/6");
System.out.println("Decimal: " + r1.add(r2).toDouble());
System.out.println();
// Test SUBTRACTION
System.out.println("=== SUBTRACTION ===");
System.out.println("Instance method - r1 - r2 = " + r1.subtract(r2));
System.out.println("Static method - Rational.subtract(r1, r2) = " + Rational.subtract(r1, r2));
System.out.println("Expected: 1/2 - 1/3 = 1/6");
System.out.println("Decimal: " + r1.subtract(r2).toDouble());
System.out.println();
// Test MULTIPLICATION
System.out.println("=== MULTIPLICATION ===");
System.out.println("Instance method - r1 * r3 = " + r1.multiply(r3));
System.out.println("Static method - Rational.multiply(r1, r3) = " + Rational.multiply(r1, r3));
System.out.println("Expected: 1/2 * 3/4 = 3/8");
System.out.println("Decimal: " + r1.multiply(r3).toDouble());
System.out.println();
// Test DIVISION
System.out.println("=== DIVISION ===");
System.out.println("Instance method - r1 ÷ r2 = " + r1.divide(r2));
System.out.println("Static method - Rational.divide(r1, r2) = " + Rational.divide(r1, r2));
System.out.println("Expected: 1/2 ÷ 1/3 = 3/2");
System.out.println("Decimal: " + r1.divide(r2).toDouble());
System.out.println();
// Test with negative numbers
System.out.println("=== NEGATIVE NUMBERS ===");
Rational neg1 = new Rational(-2, 3);
Rational neg2 = new Rational(4, -5);
System.out.println("neg1 = " + neg1); // Should show -2/3
System.out.println("neg2 = " + neg2); // Should show -4/5
System.out.println("neg1 + neg2 = " + neg1.add(neg2));
System.out.println("-2/3 + -4/5 = (-10/15 + -12/15) = -22/15");
System.out.println("neg1 * neg2 = " + neg1.multiply(neg2));
System.out.println("(-2/3) * (-4/5) = 8/15");
System.out.println();
// Test simplification
System.out.println("=== SIMPLIFICATION ===");
Rational r6 = new Rational(6, 8);
Rational r7 = new Rational(10, 25);
Rational r8 = new Rational(18, -24);
System.out.println("6/8 simplified = " + r6);
System.out.println("10/25 simplified = " + r7);
System.out.println("18/-24 simplified = " + r8);
System.out.println();
// Test chaining operations
System.out.println("=== CHAINING OPERATIONS ===");
Rational result = r1.add(r2).multiply(r3).divide(r4);
System.out.println("((r1 + r2) * r3) ÷ r4 = " + result);
System.out.println("((1/2 + 1/3) * 3/4) ÷ 2/5 = (5/6 * 3/4) ÷ 2/5 = (15/24) ÷ 2/5 = 15/24 * 5/2 = 75/48 = 25/16");
System.out.println("Decimal: " + result.toDouble());
System.out.println();
// Test integer handling
System.out.println("=== INTEGER HANDLING ===");
System.out.println("r5 = " + r5); // Should show 5, not 5/1
System.out.println("r5 + r1 = " + r5.add(r1));
System.out.println("5 + 1/2 = 11/2");
System.out.println("r1 * r5 = " + r1.multiply(r5));
System.out.println("1/2 * 5 = 5/2");
System.out.println();
// Test exception handling
System.out.println("=== EXCEPTION TEST ===");
try {
Rational invalid = new Rational(1, 0);
} catch (IllegalArgumentException e) {
System.out.println("Caught exception: " + e.getMessage());
}
try {
Rational zero = new Rational(0, 1);
Rational divisionByZero = r1.divide(zero);
} catch (ArithmeticException e) {
System.out.println("Caught division by zero: " + e.getMessage());
}
}
}
src/main/java/movie/apis/Genre.java
+32 -2
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@@ -1,5 +1,35 @@
package movie.apis;
public class Genre {
//TODO
}
private Long id;
private String name;
public Genre(Long id, String name) {
this.id = id;
this.name = name;
}
public Genre() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return id + ". " + name;
}
}
src/main/java/movie/apis/Main.java
+86 -2
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@@ -1,7 +1,91 @@
package movie.apis;
import java.util.Scanner;
public class Main {
private static final MovieService movieService = new MovieService();
private static final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
// TODO: Receive your data from here
System.out.println("\n=== MOVIE API CLIENT ===\n");
boolean running = true;
while (running) {
displayMenu();
int choice = getIntInput("Enter your choice: ");
switch (choice) {
case 1:
movieService.displayGenres();
break;
case 2:
// TODO: Get genre ID and page from user, then call movieService.displayMoviesByGenre()
break;
case 3:
// TODO: Get page number from user, then call movieService.displayAllMovies()
break;
case 4:
// TODO (BONUS): Get movie ID from user, then call movieService.displayMovieDetails()
break;
case 0:
running = false;
System.out.println("Goodbye!");
break;
default:
System.out.println("Invalid choice! Please enter 0-4");
}
if (running) {
System.out.println("\nPress Enter to continue...");
scanner.nextLine();
scanner.nextLine();
}
}
scanner.close();
}
}
private static void displayMenu() {
System.out.println("\n================================");
System.out.println(" MENU");
System.out.println("================================");
System.out.println("1. Get all genres");
System.out.println("2. Get movies by genre ID");
System.out.println("3. Get all movies");
System.out.println("4. Get movie details by ID");
System.out.println("0. Exit");
System.out.println("================================");
}
private static int getIntInput(String prompt) {
System.out.print(prompt);
while (!scanner.hasNextInt()) {
System.out.print("Invalid input. " + prompt);
scanner.next();
}
int input = scanner.nextInt();
scanner.nextLine();
return input;
}
private static Long getLongInput(String prompt) {
System.out.print(prompt);
while (!scanner.hasNextLong()) {
System.out.print("Invalid input. " + prompt);
scanner.next();
}
Long input = scanner.nextLong();
scanner.nextLine();
return input;
}
}
src/main/java/movie/apis/Movie.java
+21 -2
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@@ -1,5 +1,24 @@
package movie.apis;
import java.util.List;
/**
* Model class representing a movie
* Fields: id, title, genres, images
*/
public class Movie {
//TODO
}
private Long id;
private String title;
private List<Genre> genres;
private String images;
private String year;
private String imdbRating;
private String country;
// TODO: Create a constructor with all fields
// TODO: Create a simple constructor with id and title only
// TODO: Create getters and setters for all fields
}
src/main/java/movie/apis/MovieService.java
+148 -39
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@@ -1,25 +1,31 @@
package movie.apis;
import com.google.gson.*;
import com.google.gson.reflect.TypeToken;
import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.HashMap;
import java.util.Map;
public class MovieService {
private final static String GENRES_URL = "https://moviesapi.ir/api/v1/genres";
private static String MOVIES_BY_GENRE_URL = "https://moviesapi.ir/api/v1/genres/";
private final static String MOVIE_INFO = "https://moviesapi.ir/api/v1/movies/{movie_id}";
private final static String GENRES_URL = "https://api.meshcomp.ir/api/v1/genres";
private final static HttpClient client = HttpClient.newHttpClient();
private ArrayList<Movie> moviesList;
private ArrayList<Genre> genresList;
private Map<Long, Movie> moviesCache = new HashMap<>();
private boolean isMoviesLoaded = false;
private int totalMovies = 0;
private int totalPages = 0;
private String getGenresList() {
try {
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(GENRES_URL))
.build();
@@ -40,31 +46,7 @@ public class MovieService {
private String getMoviesByGenreList(Long genreId, Long page) {
try {
MOVIES_BY_GENRE_URL = MOVIES_BY_GENRE_URL + genreId + "/movies?page=" + page;
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(MOVIES_BY_GENRE_URL))
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() == 200) {
System.out.println("Movies By Genre received successfully");
return response.body();
} else {
throw new IOException("HTTP error code: " + response.statusCode());
}
} catch (Exception e) {
System.out.println("!!Exception : " + e.getMessage());
}
return null;
}
private String getMovieInfo(Long movieId) {
try {
String url = MOVIE_INFO.replace("{movie_id}", movieId.toString());
String url = "https://api.meshcomp.ir/api/v1/genres/" + genreId + "/movies?page=" + page;
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(url))
@@ -73,23 +55,150 @@ public class MovieService {
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() == 200) {
System.out.println("Movie Info received successfully");
return response.body();
} else {
throw new IOException("HTTP error code: " + response.statusCode());
System.out.println("HTTP error code: " + response.statusCode());
return null;
}
} catch (Exception e) {
System.out.println("!!Exception : " + e.getMessage());
}
return null;
}
// TODO: Write a method that parses the JSON returned by getGenresList() into a list of Genre objects.
// TODO: Write a method that displays the list of genres.
// TODO: Write a method whose inputs are genreId and page, and returns a list of movies for that genre and page.
// TODO: Write a method that displays the genres of a specific movie.
public void displayGenres() {
String jsonResponse = getGenresList();
if (jsonResponse == null) {
System.out.println("Failed to get genres");
return;
}
try {
JsonObject rootObject = JsonParser.parseString(jsonResponse).getAsJsonObject();
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:");
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());
}
}
/**
* TODO 1: Display movies for a specific genre and page
*
* JSON format: { "movies": [ { "id": 1, "title": "Movie", "year": "1994" } ], "total": 177, "total_pages": 18 }
*
* 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
*
* 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
try {
// Your code here
} catch (Exception e) {
System.err.println("ERROR: " + e.getMessage());
}
}
/**
* TODO 2: Load all movies into cache (called automatically when needed)
*
* Steps:
* - if (isMoviesLoaded) return; (already loaded)
* - Clear moviesCache
* - Get first page of genre 2 (Drama) to find total_pages
* - Loop through all pages (1 to total_pages)
* - For each page, get "movies" array
* - Extract: id, title, year, poster, genres array
* - For genres, loop and convert each string to Genre object
* - Store in moviesCache using id as key
* - Set isMoviesLoaded = true
*
* PUT ALL PARSING CODE INSIDE try-catch
*/
private void loadAllMovies() {
// TODO: Write your code here
// All parsing code must be inside try-catch
try {
// Your code here
} catch (Exception e) {
System.err.println("ERROR loading movies: " + e.getMessage());
}
}
/**
* TODO 3: Display all movies with pagination
*
* Steps:
* - Call loadAllMovies() first
* - Calculate total pages: (totalMovies + 9) / 10
* - Validate page number (1 to totalPages)
* - Calculate start and end index
* - Convert moviesCache.values() to List
* - Loop from start to end and display: "ID: {id} | {title} ({year})"
*
* loadAllMovies() already has try-catch inside
*/
public void displayAllMovies(int page) {
// TODO: Write your code here
// loadAllMovies() already has try-catch
// Your display logic here
}
/**
* TODO 4 (BONUS): Display movie details by ID
*
* Steps:
* - Call loadAllMovies() first
* - Get movie from moviesCache using movieId
* - If movie is null, print "Movie not found"
* - Otherwise print: ID, Title, Year, Genres, Poster
*
* loadAllMovies() already has try-catch inside
*/
public void displayMovieDetails(Long movieId) {
// TODO: Write your code here (BONUS)
// loadAllMovies() already has try-catch
// Your display logic here
}
private String getGenresString(List<Genre> genres) {
if (genres == null || genres.isEmpty()) {
return "No genres";
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < genres.size(); i++) {
sb.append(genres.get(i).getName());
if (i < genres.size() - 1) {
sb.append(", ");
}
}
return sb.toString();
}
public int getTotalMovies() {
return totalMovies;
}
}