Week3. printAverageRatings(int minimalRatings)

Author: SkyrocketStan

Week3/src/MovieRunnerWithFilters.java

@@ -0,0 +1,53 @@
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class MovieRunnerWithFilters {
+
+  /**
+   * Print a list of movies and their average ratings sorted by averages
+   *
+   * @param minimalRatings int specified number of ratings
+   */
+  public static void printAverageRatings(int minimalRatings) {
+    ThirdRatings thirdRatings = new ThirdRatings("ratings_short.csv");
+    ArrayList<Rating> ratedList = thirdRatings.getAverageRatings(minimalRatings);
+
+    Collections.sort(ratedList);
+    // Print the number of raters after creating a ThirdsRating object.
+    System.out.printf("Total movies with %d ratings is %d\n", minimalRatings, ratedList.size());
+
+    // You’ll call the MovieDatabase initialize method with the moviefile to set up the movie
+    // database.
+    MovieDatabase.initialize("ratedmoviesfull.csv");
+
+    // Print the number of movies in the database.
+    System.out.println("The number of movies in the database is " + MovieDatabase.size());
+
+    // You will call getAverageRatings with a minimal number of raters to return an ArrayList of
+    // type Rating.
+
+    ArrayList<Rating> averageRatings = thirdRatings.getAverageRatings(minimalRatings);
+
+    // Print out how many movies with ratings are returned,
+    // then sort them, and print out the rating and title of each movie
+    System.out.printf(
+        "How many movies with ratings %d are returned: %d\n",
+        minimalRatings, averageRatings.size());
+
+    averageRatings.stream()
+        .sorted()
+        .forEach(
+            rating ->
+                System.out.printf(
+                    "%-4s %s%n", rating.getValue(), MovieDatabase.getTitle(rating.getItem())));
+    //    System.out.printf(
+    //            "The name of the movie that has the lowest rating is \"%s\"\n",
+    //            thirdRatings.getTitle(ratedList.get(0).getItem()));
+    //    for (Rating ratedObj : ratedList) {
+    //      double rating = ratedObj.getValue();
+    //      String movieID = ratedObj.getItem();
+    //      String movieTitle = secondRatings.getTitle(movieID);
+    //      System.out.println(rating + " " + movieTitle);
+    //    }
+  }
+}

Week3/src/ThirdRatings.java

@@ -3,15 +3,15 @@
 public class ThirdRatings {
 
   private final ArrayList<Rater> myRaters;
-  private ArrayList<String> allMoviesIDs;
+  private final ArrayList<String> allMoviesIDs;
 
   public ThirdRatings() {
     this("ratings.csv");
-    allMoviesIDs = MovieDatabase.filterBy(new TrueFilter());
   }
 
   public ThirdRatings(String ratingsFileName) {
     this.myRaters = FirstRatings.loadRaters(ratingsFileName);
+    this.allMoviesIDs = MovieDatabase.filterBy(new TrueFilter());
   }
 
   public ArrayList<Rating> getAverageRatings(int minimalRaters) {

Week3/src/Week3.java

@@ -0,0 +1,8 @@
+public class Week3 {
+  public static void main(String[] args) {
+    //    ThirdRatings week3 = new ThirdRatings();
+    //    ArrayList<Rating> averageRatings = week3.getAverageRatings(1);
+    //    averageRatings.forEach(System.out::println);
+    MovieRunnerWithFilters.printAverageRatings(1);
+  }
+}