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Added on -2019-09-18

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ContentsRating.java.......................................................................................................................................2RatingManager.java.........................................................................................................................3
Rating.javapublic class Rating { private int userId; private int itemId; private int value; public Rating(int userId, int itemId, int value) { this.userId = userId; this.itemId = itemId; this.value = value; } public int getUserId() { return userId; } public int getItemId() { return itemId; }
public int getValue() { return value; }}RatingManager.javaimport java.io.File;import java.io.FileNotFoundException;import java.util.Arrays;import java.util.LinkedList;import java.util.Scanner;import java.util.StringTokenizer;import java.util.logging.Level;import java.util.logging.Logger;public class RatingManager { private static int i = -1; private static Rating ratingAr[];
public static void main(String args[]) { ratingAr = new Rating[100000]; String fileName = "src/ratings.txt"; RatingManager rm = read(fileName); int itemID = 1827; System.out.println("Item rating for "+itemID); int rating[] = rm.getItemRatings(itemID); for(int r: rating){ if(r == 0) break; System.out.print(r+", "); } System.out.println("\n"); System.out.println("Average rating for "+itemID); double avgRating = rm.getAverageItemRating(itemID); System.out.print(avgRating+"\n\n"); int userID = 6393; System.out.println("Average rating for user "+userID); double avgUserRating = rm.getAverageUserRating(userID);

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