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// Nik Johnson
// TA: Zachary Bi
// 4-2-2024
import java.util.*;
import java.text.DecimalFormat;
// book object, which can have a title, authors, and a list of ratings
public class Book implements Media {
private String title;
private String author;
private List<String> authors;
private List<Integer> ratings;
public Book(String title, String author) {
this.title = title;
this.author = author;
}
public Book(String title, List<String> authors) {
this.title = title;
this.authors = authors;
}
public String getTitle() {
return this.title;
}
public List<String> getArtists() {
List<String> artists = new ArrayList<>();
if (this.author != null) {
artists.add(this.author);
}
if (this.authors != null) {
for (String author : authors) {
artists.add(author);
}
}
return artists;
}
public void addRating(int score) {
if (this.ratings == null) {
ratings = new ArrayList<>();
}
this.ratings.add(score);
}
public int getNumRatings() {
if (this.ratings == null) {
return 0;
}
return this.ratings.size();
}
public double getAverageRating() {
if (this.ratings == null) {
return 0;
}
int sum = 0;
for (int rating : ratings) {
sum += rating;
}
return (double)sum / this.ratings.size();
}
public String toString() {
String output = "";
output += this.title + " by " + this.getArtists() + ": ";
DecimalFormat df = new DecimalFormat("#." + "0".repeat(2));
if (ratings != null) {
output += df.format(this.getAverageRating()) + " (" + (this.ratings.size()) + " ratings" + ")";
return output;
}
return output + "No ratings yet!";
}
}
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