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Thread: input mismatch exception

  1. #1
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    Default input mismatch exception

    I need to use InputMismatchException and FileNotFoundExeption with a try catch. I got the file not found exception to work but my input mismatch exception wont work and I don't know why.

    i have two test files for this. the code essentially is supposed to add up all the numbers in a file and report the answer. my test file 1 is simple the numbers are 1.0 2.0 3.0 4.0 and 5.0, it works and adds up to 15 and gives me back 15 like its supposed top. If i put in a bad file name my first exception works and it says file does not exist.

    my second test file says 1.0 2.0 3f 4.0 and 5.0. when i use my second file its supposed to say only numbers are accepted, instead it just gives me back a 3, i guess it just stops at 3 once it sees the f and quits the program. i want it to say only numbers accepted.
    can someone help here is my code:
    import java.util.*;
    import java.io.*;
     
    public class Program2
    {
        public static void main(String []args)
        {
            try
            {
              Scanner i = new Scanner(System.in);
              System.out.println("Enter The File Name: ");
              String file = i.nextLine();
              File input = new File(file);
              Scanner out = new Scanner(input);
              double total = 0;
            while(out.hasNextDouble())
            {
                total += out.nextDouble();
            }
             System.out.println(total);
            }   
     
            catch (FileNotFoundException e)
            {
                System.out.println("File does not exist.");
            }
            catch (InputMismatchException e)
            {
                System.out.println("Only Numbers are accepted.");
     
            }
     
        }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: input mismatch exception

    while(out.hasNextDouble())
    Would this protect the nextDouble() from having a input mismatch?

    gives me back a 3
    1.0 + 2.0 = 3
    If you don't understand my answer, don't ignore it, ask a question.

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