init

debugging/Book.java

@@ -0,0 +1,71 @@
+import java.util.*;
+
+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() {
+        return this.title + " by " + this.getArtists() + ": " + this.getAverageRating() + 
+        (this.ratings.size()) + " ratings";
+    }
+}