72 lines
1.6 KiB
Java
72 lines
1.6 KiB
Java
import java.util.*;
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public class Book implements Media {
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private String title;
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private String author;
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private List<String> authors;
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private List<Integer> ratings;
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public Book(String title, String author) {
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this.title = title;
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this.author = author;
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}
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public Book(String title, List<String> authors) {
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this.title = title;
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this.authors = authors;
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}
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public String getTitle() {
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return this.title;
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}
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public List<String> getArtists() {
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List<String> artists = new ArrayList<>();
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if (this.author != null) {
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artists.add(this.author);
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}
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if (this.authors != null) {
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for (String author : authors) {
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artists.add(author);
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}
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}
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return artists;
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}
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public void addRating(int score) {
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if (this.ratings == null) {
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ratings = new ArrayList<>();
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}
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this.ratings.add(score);
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}
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public int getNumRatings() {
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if (this.ratings == null) {
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return 0;
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}
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return this.ratings.size();
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}
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public double getAverageRating() {
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if (this.ratings == null) {
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return 0;
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}
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int sum = 0;
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for (int rating : ratings) {
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sum += rating;
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}
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return (double)sum / this.ratings.size();
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}
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public String toString() {
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return this.title + " by " + this.getArtists() + ": " + this.getAverageRating() +
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(this.ratings.size()) + " ratings";
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}
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}
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