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Exercise
You have collected a file of movie ratings where each movie is rated from 1 (bad) to 5 (excellent). The first line of the file is a number that identifies how many ratings are in the file. Each rating then consists of two lines: the name of the movie followed by the numeric rating from 1 to 5. Here is a sample rating file with four unique movies and seven ratings:
7Harry Potter and the Half-Blood Prince4Harry Potter and the Half-Blood Prince5Army of the Dead 1Harry Potter and the Half-Blood Prince 4Army of the Dead 2The Uninvited 4Pandorium3
Write a program that reads a file in this format, calculates the average rating for each movie, and outputs the average along with the number of reviews. Here is the desired output for the sample data:
Harry Potter and the Half-Blood Prince: 3 reviews, average of 4.3 / 5 Army of the Dead: 2 reviews, average of 1.5 / 5 The Uninvited: 1 review, average of 4 / 5 Pandorium: 1 review, average of 3 / 5
Use a HashMap or multiple HashMaps to calculate the output. Your map(s) should index from a string representing each movie’s name to integers that store the number of reviews for the movie and the sum of the ratings for the movie.
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