File I/O Processing and Printing in CSE 122 Spring 2024

 
File I/O – Hybrid
processing and Printing
 
Talk to your neighbors:
 
BEFORE WE START
 
Any weekend plans?
 
Music:
 
122 24sp Lecture Tunes 🌼
 
Lecture Outline
 
•
Announcements/Reminders
•
Refresh Last Time
•
Scanners with Strings
-
Hybrid Approach & Files
•
Using Printstream for File Output
•
Example
 
Announcements
 
•
Programming Assignment 0 (P0) out later today!
-
Due next Thursday, April 11
th
!
-
Focused on File I/O
•
Creative Project 0 (C0) was due last night. How’d it go?
-
E
xpe
ct grades back about a week after the assignment was due
-
Joined class late? Use Resubmission Cycle 0 to submit it!
 
Lecture Outline
 
•
Announcements/Reminders
•
Refresh Last Time
•
Scanners with Strings
-
Hybrid Approach & Files
•
Using Printstream for File Output
•
Example
 
(Last Time) 
Scanner/File
 for input
 
Lesson 14 - Spring 2023
 
5
 
Scanner is defined in the
java.util
 package
import java.util.*;
 
Scanner
 
console
 = 
new
 
Scanner
(System.in);
 
File
 
newFile
 = 
new
 
File
(
"example.txt"
);
Scanner
 
fileScan
 = 
new
 
Scanner
(
newFile
);
 
File is defined in the
java.io
 package
import java.io`.*;
 
(PCM) 
Typical Line-Processing Pattern
 
Lesson 14 - Spring 2023
 
6
 
while
 (
scan
.
hasNextLine
()) {
    
String
 
nextLine
 = 
scan
.
nextLine
();
    
// do something with nextLine
}
 
(PCM) 
Typical Token-Processing Pattern
 
Lesson 14 - Spring 2023
 
7
 
while
 (
scan
.
hasNext__
()) {
    
__
 
nextToken
 = 
scan
.
next__
();
    
// do something with nextToken
}
 
Lecture Outline
 
•
Announcements/Reminders
•
Refresh Last Time
•
Scanners with Strings
-
Hybrid Approach & Files
•
Using Printstream for File Output
•
Example
 
(PCM) 
Scanner
s with 
String
s
 
Lesson 14 - Spring 2023
 
9
 
String
 
str
 = 
"A quick,  brown fox"
;
 
Scanner
 
stringScan
 = 
new
 
Scanner
(
str
);
while
 (
stringScan
.
hasNext__
()) {
    
__
 
nextToken
 = 
stringScan
.
next__
();
    
// do something with nextToken
}
 
(PCM) 
Scanner
s with 
String
s
 
Lesson 14 - Spring 2023
 
10
 
String
 
str
 = 
"A quick,  brown fox"
;
 
Scanner
 
stringScan
 = 
new
 
Scanner
(
str
);
while
 (
stringScan
.
hasNext
()) {
    
String
 
nextToken
 = 
stringScan
.
next
();
    System.out.
println
(
nextToken
);
}
 
(PCM) 
Scanner
s with 
String
s
 
Lesson 14 - Spring 2023
 
11
 
String
 
str
 = 
"
A
 quick,  brown fox"
;
 
Scanner
 
stringScan
 = 
new
 
Scanner
(
str
);
while
 (
stringScan
.
hasNext
()) {
    
String
 
nextToken
 = 
stringScan
.
next
();
    System.out.
println
(
nextToken
);
}
 
A
 
(PCM) 
Scanner
s with 
String
s
 
Lesson 14 - Spring 2023
 
12
 
String
 
str
 = 
"A 
quick,
  brown fox"
;
 
Scanner
 
stringScan
 = 
new
 
Scanner
(
str
);
while
 (
stringScan
.
hasNext
()) {
    
String
 
nextToken
 = 
stringScan
.
next
();
    System.out.
println
(
nextToken
);
}
 
quick,
 
(PCM) 
Scanner
s with 
String
s
 
Lesson 14 - Spring 2023
 
13
 
String
 
str
 = 
"A quick,  
brown
 fox"
;
 
Scanner
 
stringScan
 = 
new
 
Scanner
(
str
);
while
 (
stringScan
.
hasNext
()) {
    
String
 
nextToken
 = 
stringScan
.
next
();
    System.out.
println
(
nextToken
);
}
 
brown
 
(PCM) 
Scanner
s with 
String
s
 
Lesson 14 - Spring 2023
 
14
 
String
 
str
 = 
"A quick,  brown 
fox
"
;
 
Scanner
 
stringScan
 = 
new
 
Scanner
(
str
);
while
 (
stringScan
.
hasNext
()) {
    
String
 
nextToken
 = 
stringScan
.
next
();
    System.out.
println
(
nextToken
);
}
 
fox
 
Lecture Outline
 
•
Announcements/Reminders
•
Refresh Last Time
•
Scanners with Strings
-
Hybrid Approach & Files
•
Using Printstream for File Output
•
Example
(PCM) 
Typical Hybrid Pattern
Lesson 14 - Spring 2023
16
File 
newFile 
= 
new
 
File
(
"in.txt"
);
 
Scanner 
fileScan
 = 
new
 
Scanner
(
newFile
);
while
 (
fileScan
.
hasNextLine
()) {
    
String
 
line
 = 
fileScan
.
nextLine
();
}
 
    Scanner
 
lineScan
 = 
new
 
Scanner
(
line
);
    
while
 (
lineScan
.
hasNext__
()) {
        
__
 
nextToken
 = 
lineScan
.
next__
();
        
// do something with nextToken
    }
(PCM) 
Token vs. Line vs. Hybrid?
Lesson 14 - Spring 2023
17
(PCM) 
Token vs. Line vs. Hybrid?
 
•
We now know 3 different
ways to use Files!
•
Although this gives us
flexibility – it can
sometimes get confusing
•
Feel free to use the
following diagram to help!
 
yes
 
no
 
yes
 
no
 
Lesson 14 - Spring 2023
 
18
 
(PCM) 
Scanning Numeric Data
 
On Wednesday, we primarily used 
String
-based 
Scanner
 methods to
read input from a file. Let's work with some numeric data now!
 
We're going to make more use of
•
hasNextInt()
•
hasNextDouble()
•
nextInt()
•
nextDouble()
•
Assumptions about our file's format!
 
What would be the result of executing the following code?
2.3 9.2
    17           0.73
   -1.5000
 
data.txt
 
Scanner
 
fileScan
 
=
 
new
 
Scanner
(
new
 
File
(
"data.txt"
));
while
 (
fileScan
.
hasNextLine
()) {
    
String
 
line
 
=
 
fileScan
.
nextLine
();
    
Scanner
 
lineScan
 
=
 
new
 
Scanner
(
line
);
    
double
 
min
 
=
 
lineScan
.
nextDouble
();
    
double
 
max
 
=
 
min
;
    
while
 (
lineScan
.
hasNextDouble
()) {
        
double
 
nextNum
 
=
 
lineScan
.
nextDouble
();
        
min
 
=
 
Math
.
min
(
min
, 
nextNum
);
        
max
 
=
 
Math
.
max
(
max
, 
nextNum
);
    }
    
System
.
out
.
println
(
"Max: "
 
+
 
max
 
+
 
", Min: "
 
+
 
min
);
}
 
A) 
Max: 9.2, Min: 2.3
    
 Max: 17.0, Min: 0.73
     Max: -1.5, Min: -1.5
 
B)
 Max: 9.2, Min: -1.5
 
C)
 Max: 9.2, Min: 2.3
    
 Max: 17, Min: 0.73
     Max: 0.0, Min: -1.5
 
D)
 Error
2.3 9.2
    17           0.73
   -1.5000
 
data.txt
 
Scanner
 
fileScan
 
=
 
new
 
Scanner
(
new
 
File
(
"data.txt"
));
while
 (
fileScan
.
hasNextLine
()) {
    
String
 
line
 
=
 
fileScan
.
nextLine
();
    
Scanner
 
lineScan
 
=
 
new
 
Scanner
(
line
);
    
double
 
min
 
=
 
lineScan
.
nextDouble
();
    
double
 
max
 
=
 
min
;
    
while
 (
lineScan
.
hasNextDouble
()) {
        
double
 
nextNum
 
=
 
lineScan
.
nextDouble
();
        
min
 
=
 
Math
.
min
(
min
, 
nextNum
);
        
max
 
=
 
Math
.
max
(
max
, 
nextNum
);
    }
    
System
.
out
.
println
(
"Max: "
 
+
 
max
 
+
 
", Min: "
 
+
 
min
);
}
 
What would be the result of executing the following code?
 
A) 
Max: 9.2, Min: 2.3
    
 Max: 17.0, Min: 0.73
     Max: -1.5, Min: -1.5
 
B)
 Max: 9.2, Min: -1.5
 
C)
 Max: 9.2, Min: 2.3
    
 Max: 17, Min: 0.73
     Max: 0.0, Min: -1.5
 
D)
 Error
 
Lecture Outline
 
•
Announcements/Reminders
•
Refresh Last Time
•
Scanners with Strings
-
Hybrid Approach & Files
•
Using Printstream for File Output
•
Example
(PCM) 
PrintStreams
 for output
Lesson 15 - 
Spring
 202
22
File
 
outputFile
 = 
new
 
File
(
"out.txt"
);
PrintStream
 
output
 = 
new
 
PrintStream
(
outputFile
);
PrintStream
 is defined
in the 
java.io
 package
import java.io.*;
 
System
.
out
.
print
(
"Hello, world! "
);
System
.
out
.
println
(
"#1 Bee Movie fan!"
);
output
.
print
(
"Hello, world! "
);
output
.
println
(
"#1 Bee 
Mo
vie fan!"
);
 
Hello, world! #1 Bee Movie fan!
 
Lecture Outline
 
•
Announcements/Reminders
•
Refresh Last Time
•
Scanners with Strings
-
Hybrid Approach & Files
•
Using Printstream for File Output
•
Example
 
Movie Ratings
 
In this program, we'll be examining and altering data from a
file of IMDB ratings for popular U.S. movies. This will happen
through 3 major user-entered commands:
 
(F)ind
 movie, 
(A)dd
 a rating, and 
(S)ave
.
5
Title   Average Total
Bee_Movie   6.1 176805
Barbie  6.9 455488
Oppenheimer 8.4
 
588723
Poor_Things 8.5
 
20542
Spider-Man:_Across_the_Spider-Verse 8.6
 
329200
 
small.tsv
 
Movie Ratings
Welcome to the CSE 122 Movie Rating Program!
Loaded 5 movies from small.tsv!
 
Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit
Enter your choice: 
F
What's the name of the movie? 
Bee_Movie
Movie Bee_Movie found!
    Average Rating: 6.1
    Total Ratings: 176805
 
Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit
Enter your choice: 
A
What movie would you like to add your rating to? 
Bee_Movie
And what rating would you like to give? 
100000
 
Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit
Enter your choice: 
f
What's the name of the movie? 
Bee_Movie
Movie Bee_Movie found!
    Average Rating: 6.7
    Total Ratings: 176806
 
Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit
Enter your choice: 
S
What's the name of the file you'd like to save to? 
out.txt
 
Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit
Enter your choice: 
q
Thank you for using this program! Bye!
5
Title   Average Total
Bee_Movie   6.1 176805
Barbie  6.9 455488
Oppenheimer 8.4
 
588723
Poor_Things 8.5
 
20542
Spider-Man:_Across_the_Spider-Verse 8.6
 
329200
 
small.tsv
[Bee_Movie, Barbie, Oppenheimer, Poor_Things, Spider-Man…]
[6.1,       6.9,    8.4,         8.5,         8.6]
[176805,    455488, 588723,      20542,       329200]
 
Movie Ratings: Development Strategy
 
1.
Fill in the main method with a loop that calls a method to read the data in from
the .tsv file and allows the user to select between the different options (find,
add, save, quit)
2.
Implement a method to load the movie rating data from the file and populate
the appropriate arrays
3.
Implement a method that allows users to find the rating for a movie
4.
Implement a method that allows users to add a rating for a movie
5.
Implement a method that allows users to save the movie ratings information to
a file
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LEC.03 covers File I/O Hybrid Processing and Printing in the CSE 122 course for Spring 2024. The lecture outlines the use of scanners with strings, hybrid approach, and files along with using PrintStream for file output. Important announcements regarding Programming Assignment 0 (P0) and Creative Project 0 (C0) deadlines are highlighted. Details about scanner methods for reading input and examples are provided in the session.


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  1. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 BEFORE WE START Talk to your neighbors: Any weekend plans? LEC 03 CSE 122 CSE 122 File I/O Hybrid processing and Printing Music: 122 24sp Lecture Tunes Instructors: Miya Natsuhara and Kasey Champion TAs: Ayush Poojitha Chloe Ailsa Jasmine Lucas Logan Kyle Jacob Atharva Rucha Megana Eesha Zane Colin Ronald Saivi Shivani Kavya Steven Ken Chaafen Smriti Ambika Elizabeth Aishah Minh Katharine Questions during Class? Raise hand or send here sli.do #cse122

  2. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Lecture Outline Announcements/Reminders Refresh Last Time Scanners with Strings - Hybrid Approach & Files Using Printstream for File Output Example

  3. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Announcements Programming Assignment 0 (P0) out later today! - Due next Thursday, April 11th! - Focused on File I/O Creative Project 0 (C0) was due last night. How d it go? - Expect grades back about a week after the assignment was due - Joined class late? Use Resubmission Cycle 0 to submit it!

  4. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Lecture Outline Announcements/Reminders Refresh Last Time Scanners with Strings - Hybrid Approach & Files Using Printstream for File Output Example

  5. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (Last Time) Scanner/File for input Scanner console = new Scanner(System.in); Scanner is defined in the java.util package File is defined in the java.io package File newFile = new File("example.txt"); Scanner fileScan = new Scanner(newFile); import java.util.*; import java.io`.*; Scanner Methods Description Reads the next token from the user as an int and returns it nextInt() Reads the next token from the user as a double and returns it nextDouble() Reads the next token from the user as a String and returns it next() Reads an entire line from the user as a String and returns it nextLine() Returns true if the next token can be read as an int, false otherwise hasNextInt() Returns true if the next token can be read as a double, false otherwise hasNextDouble() Returns true if there is another token of input to be read in, false otherwise hasNext() Returns true if there is another line of input to be read in, false otherwise hasNextLine() Lesson 14 - Spring 2023 5

  6. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Typical Line-Processing Pattern while (scan.hasNextLine()) { String nextLine = scan.nextLine(); // do something with nextLine } Lesson 14 - Spring 2023 6

  7. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Typical Token-Processing Pattern while (scan.hasNext__()) { __ nextToken = scan.next__(); // do something with nextToken } Lesson 14 - Spring 2023 7

  8. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Lecture Outline Announcements/Reminders Refresh Last Time Scanners with Strings - Hybrid Approach & Files Using Printstream for File Output Example

  9. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Scanners with Strings String str = "A quick, brown fox"; Scanner stringScan = new Scanner(str); while (stringScan.hasNext__()) { __ nextToken = stringScan.next__(); // do something with nextToken } Lesson 14 - Spring 2023 9

  10. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Scanners with Strings String str = "A quick, brown fox"; Scanner stringScan = new Scanner(str); while (stringScan.hasNext()) { String nextToken = stringScan.next(); System.out.println(nextToken); } Lesson 14 - Spring 2023 10

  11. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Scanners with Strings String str = "A quick, brown fox"; Scanner stringScan = new Scanner(str); while (stringScan.hasNext()) { String nextToken = stringScan.next(); System.out.println(nextToken); } Lesson 14 - Spring 2023 A 11

  12. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Scanners with Strings String str = "A quick, brown fox"; Scanner stringScan = new Scanner(str); while (stringScan.hasNext()) { String nextToken = stringScan.next(); System.out.println(nextToken); } Lesson 14 - Spring 2023 quick, 12

  13. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Scanners with Strings String str = "A quick, brown fox"; Scanner stringScan = new Scanner(str); while (stringScan.hasNext()) { String nextToken = stringScan.next(); System.out.println(nextToken); } Lesson 14 - Spring 2023 brown 13

  14. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Scanners with Strings String str = "A quick, brown fox"; Scanner stringScan = new Scanner(str); while (stringScan.hasNext()) { String nextToken = stringScan.next(); System.out.println(nextToken); } Lesson 14 - Spring 2023 fox 14

  15. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Lecture Outline Announcements/Reminders Refresh Last Time Scanners with Strings - Hybrid Approach & Files Using Printstream for File Output Example

  16. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Typical Hybrid Pattern File newFile = new File("in.txt"); Scanner fileScan = new Scanner(newFile); while (fileScan.hasNextLine()) { String line = fileScan.nextLine(); Scanner lineScan = new Scanner(line); while (lineScan.hasNext__()) { __ nextToken = lineScan.next__(); // do something with nextToken } } Lesson 14 - Spring 2023 16

  17. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Token vs. Line vs. Hybrid? (PCM) Token vs. Line vs. Hybrid? We now know 3 different ways to use Files! Although this gives us flexibility it can sometimes get confusing Feel free to use the following diagram to help! Are separate lines meaningful? no yes Token-based Do you need individual tokens? no yes Line-based Hybrid! Lesson 14 - Spring 2023 17

  18. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) Scanning Numeric Data On Wednesday, we primarily used String-based Scanner methods to read input from a file. Let's work with some numeric data now! We're going to make more use of hasNextInt() hasNextDouble() nextInt() nextDouble() Assumptions about our file's format! Lesson 14 - Spring 2023 18

  19. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Practice : Think sli.do #cse122 What would be the result of executing the following code? Scanner fileScan = new Scanner(new File("data.txt")); while (fileScan.hasNextLine()) { String line = fileScan.nextLine(); Scanner lineScan = new Scanner(line); double min = lineScan.nextDouble(); double max = min; while (lineScan.hasNextDouble()) { double nextNum = lineScan.nextDouble(); min = Math.min(min, nextNum); max = Math.max(max, nextNum); } System.out.println("Max: " + max + ", Min: " + min); } A) Max: 9.2, Min: 2.3 Max: 17.0, Min: 0.73 Max: -1.5, Min: -1.5 B) Max: 9.2, Min: -1.5 C) Max: 9.2, Min: 2.3 Max: 17, Min: 0.73 Max: 0.0, Min: -1.5 2.3 9.2 17 0.73 -1.5000 D) Error data.txt

  20. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Practice : Pair sli.do #cse122 What would be the result of executing the following code? Scanner fileScan = new Scanner(new File("data.txt")); while (fileScan.hasNextLine()) { String line = fileScan.nextLine(); Scanner lineScan = new Scanner(line); double min = lineScan.nextDouble(); double max = min; while (lineScan.hasNextDouble()) { double nextNum = lineScan.nextDouble(); min = Math.min(min, nextNum); max = Math.max(max, nextNum); } System.out.println("Max: " + max + ", Min: " + min); } A) Max: 9.2, Min: 2.3 Max: 17.0, Min: 0.73 Max: -1.5, Min: -1.5 B) Max: 9.2, Min: -1.5 C) Max: 9.2, Min: 2.3 Max: 17, Min: 0.73 Max: 0.0, Min: -1.5 2.3 9.2 17 0.73 -1.5000 D) Error data.txt

  21. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Lecture Outline Announcements/Reminders Refresh Last Time Scanners with Strings - Hybrid Approach & Files Using Printstream for File Output Example

  22. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 (PCM) PrintStreams for output PrintStream is defined in the java.io package File outputFile = new File("out.txt"); PrintStream output = new PrintStream(outputFile); import java.io.*; Description PrintStream Methods Prints the given value to the set output location. print( ) Prints the given value to the set output location, and then terminates the line. println( ) System.out.print("Hello, world! "); System.out.println("#1 Bee Movie fan!"); output.print("Hello, world! "); output.println("#1 Bee Movie fan!"); Hello, world! #1 Bee Movie fan! 22 Lesson 15 - Spring 202

  23. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Lecture Outline Announcements/Reminders Refresh Last Time Scanners with Strings - Hybrid Approach & Files Using Printstream for File Output Example

  24. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Movie Ratings In this program, we'll be examining and altering data from a file of IMDB ratings for popular U.S. movies. This will happen through 3 major user-entered commands: (F)ind movie, (A)dd a rating, and (S)ave. small.tsv 5 Title Average Total Bee_Movie 6.1 176805 Barbie 6.9 455488 Oppenheimer 8.4 Poor_Things 8.5 Spider-Man:_Across_the_Spider-Verse 8.6 588723 20542 329200

  25. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Movie Ratings Welcome to the CSE 122 Movie Rating Program! Loaded 5 movies from small.tsv! Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit Enter your choice: F What's the name of the movie? Bee_Movie Movie Bee_Movie found! Average Rating: 6.1 Total Ratings: 176805 small.tsv Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit Enter your choice: A What movie would you like to add your rating to? Bee_Movie And what rating would you like to give? 100000 5 Title Average Total Bee_Movie 6.1 176805 Barbie 6.9 455488 Oppenheimer 8.4 588723 Poor_Things 8.5 20542 Spider-Man:_Across_the_Spider-Verse 8.6 329200 Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit Enter your choice: f What's the name of the movie? Bee_Movie Movie Bee_Movie found! Average Rating: 6.7 Total Ratings: 176806 Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit Enter your choice: S What's the name of the file you'd like to save to? out.txt Menu: (F)ind movie, (A)dd rating, (S)ave, (Q)uit Enter your choice: q Thank you for using this program! Bye! [Bee_Movie, Barbie, Oppenheimer, Poor_Things, Spider-Man ] [6.1, 6.9, 8.4, 8.5, 8.6] [176805, 455488, 588723, 20542, 329200]

  26. LEC 03: File I/O Hybrid Processing and Printing CSE 122 Spring 2024 Movie Ratings: Development Strategy 1. Fill in the main method with a loop that calls a method to read the data in from the .tsv file and allows the user to select between the different options (find, add, save, quit) 2. Implement a method to load the movie rating data from the file and populate the appropriate arrays 3. Implement a method that allows users to find the rating for a movie 4. Implement a method that allows users to add a rating for a movie 5. Implement a method that allows users to save the movie ratings information to a file

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