Reading Text File into Array using Java generates Exception

Question

Even though the file Movie_db.txt isn't empty, I get the following exception:

the text file consists of this:

hank horror 20.0 18 1

public void syncDB(List<Movie> movieList) throws IOException {
  Scanner scanner = new Scanner("Movie_db.txt");
  BufferedReader reader = null;
  try {
      String line = null;
      String title;
      String genre;
      double movieDuration;
      int ageRestriction;
      int id;
      while (scanner.hasNext()) {
          title = scanner.next();
          genre = scanner.next();
          movieDuration = scanner.nextDouble();
          ageRestriction = scanner.nextInt();
          id = scanner.nextInt();
          movieList.add(new Movie(title, genre, movieDuration, ageRestriction, id));
      }
  } catch (Exception e) {
      System.out.println("List is empty");
  }
}

please share the file content as well with exact name of the file. — Vinay Prajapati
– Vinay Prajapati, Commented Oct 1, 2019 at 8:40
The problem with your exception handling is that you print List is empty for any exception which might happen in your code. Use a debugger to find out the actual line which is causing the exception. — Tim Biegeleisen
– Tim Biegeleisen, Commented Oct 1, 2019 at 8:40
call e.printStackTrace() in the catch block. and update the output. — Sandeep Polamuri
– Sandeep Polamuri, Commented Oct 1, 2019 at 8:42
How are you so sure that if the code fails it will be because the "List is empty"? — Ashvin Sharma
– Ashvin Sharma, Commented Oct 1, 2019 at 8:44
@SandeepPolamuri Im getting these errors from stacktrace: java.util.InputMismatchException at java.base/java.util.Scanner.throwFor(Scanner.java:939) at java.base/java.util.Scanner.next(Scanner.java:1594) at java.base/java.util.Scanner.nextDouble(Scanner.java:2564) — lasvega
– lasvega, Commented Oct 1, 2019 at 8:46

Community · Accepted Answer · 2021-04-13 09:33:02Z

2

Considering your path is correct, there is a problem in your code. I'd change this line

    Scanner scan = new Scanner("Movie_db.txt");

with this one

    Scanner scan = new Scanner(Paths.get("Movie_db.txt"));

The reason is that in your snippet the Scanner only reads the string "Movie_db.txt" and in the second snippet it recognizes as the path to file.

Read Scanner documentation for more info

edited Apr 13, 2021 at 9:33

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answered Oct 1, 2019 at 8:55

Ashvin Sharma

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Vinay Prajapati · Accepted Answer · 2019-10-01 08:59:49Z

-1

genre = scan.next(); line is throwing exception because nothing is left to read from file now, which causes catch block to execute.

You are providing a string to Scanner which is a valid input for scanner. Hence, it never reads the file.

Scanner scan = new Scanner(new File("full_path_to_container_dir/Movie_db.txt"));

Please have a look at this blog on how to read from a file using scanner - https://www.java67.com/2012/11/how-to-read-file-in-java-using-scanner-example.html.

answered Oct 1, 2019 at 8:59

Vinay Prajapati

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