Week2. Complete.

Author: SkyrocketStan

Week2/src/MovieRunnerAverage.java

@@ -2,14 +2,18 @@
 import java.util.Collections;
 
 public class MovieRunnerAverage {
+  private final SecondRatings secondRatings;
 
-  public MovieRunnerAverage() {}
+  public MovieRunnerAverage() {
+    secondRatings = new SecondRatings("ratedmoviesfull.csv", "ratings.csv");
+  }
 
-  public void printAverageRatings() {
-    SecondRatings secondRatings = new SecondRatings("ratedmovies_short.csv", "ratings_short.csv");
-    System.out.printf(
-        "Total number of movies %d, total number of raters %d\n",
-        secondRatings.getMovieSize(), secondRatings.getRaterSize());
+  public void printAverageRatings(int minimalRatings) {
+    //    SecondRatings secondRatings = new SecondRatings("ratedmovies_short.csv",
+    // "ratings_short.csv");
+    //    System.out.printf(
+    //        "Total number of movies %d, total number of raters %d\n",
+    //        secondRatings.getMovieSize(), secondRatings.getRaterSize());
 
     /*
      * In the MovieRunnerAverage class in the printAverageRatings method,
@@ -26,13 +30,22 @@ public void printAverageRatings() {
      * 8.25 Her
      * 9.0 The Godfather
      * */
-    ArrayList<Rating> ratedList = secondRatings.getAverageRatings(3);
+    ArrayList<Rating> ratedList = secondRatings.getAverageRatings(minimalRatings);
     Collections.sort(ratedList);
-    for (Rating ratedObj : ratedList) {
-      double rating = ratedObj.getValue();
-      String movieID = ratedObj.getItem();
-      String movieTitle = secondRatings.getTitle(movieID);
-      System.out.println(rating + " " + movieTitle);
-    }
+    System.out.printf("Total movies with %d ratings is %d\n", minimalRatings, ratedList.size());
+    System.out.printf(
+        "The name of the movie that has the lowest rating is \"%s\"\n",
+        secondRatings.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);
+    //    }
+  }
+
+  Double getAverageRatingOneMovie(String movieTitle) {
+    String movieID = secondRatings.getID(movieTitle);
+    return secondRatings.getAverageByID(movieID, 1);
   }
 }

Week2/src/SecondRatings.java

@@ -89,7 +89,7 @@ public int getRaterSize() {
   if there are at least minimalRaters ratings.
   If there are not minimalRaters ratings, then it returns 0.0.
   */
-  private Double getAverageByID(String id, Integer minimalRaters) {
+  Double getAverageByID(String id, Integer minimalRaters) {
     double result = 0.0;
     ArrayList<Double> ratings = moviesAndRatings.get(id);
     if (ratings != null && ratings.size() >= minimalRaters) {

Week2/src/Week2.java

@@ -1,6 +1,32 @@
 public class Week2 {
   public static void main(String[] args) {
     MovieRunnerAverage average = new MovieRunnerAverage();
-    average.printAverageRatings();
+
+    System.out.printf(
+        "Q5. What is the rating of the movie “The Maze Runner”? - %.4f\n",
+        average.getAverageRatingOneMovie("The Maze Runner"));
+
+    System.out.printf(
+        "Q6. What is the rating of the movie “Moneyball”? - %.4f\n",
+        average.getAverageRatingOneMovie("Moneyball"));
+
+    System.out.printf(
+        "Q7. what is the rating of the movie “Vacation”? - %.4f\n",
+        average.getAverageRatingOneMovie("Vacation"));
+
+    // Q8. Using the files ratedmoviesfull.csv and ratings.csv, how many movies have 50 or more
+    // ratings?
+    average.printAverageRatings(50);
+
+    // Q9. Using the files ratedmoviesfull.csv and ratings.csv, of those movies that have at least
+    // 20 ratings,
+    // what is the name of the movie that has the lowest rating?
+
+    average.printAverageRatings(20);
+
+    // Using the files ratedmoviesfull.csv and ratings.csv,
+    // of those movies that have at least 12 ratings,
+    // what is the name of the movie that has the lowest rating?
+    average.printAverageRatings(12);
   }
 }