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Thread: What's wrong with my code?

  1. #1
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    Default What's wrong with my code?

    My code's not working and I don't know why. I'm trying to read numerical values from a file and saving all instances where a letter is entered instead of a number to a string to be referenced as an error at a later point on in the code. However, there's an error and like I've stated before, I don't know what caused it.
         public static void validateData() throws IOException{
                    File myfile = new File("gradeInput.txt");
                    Scanner inputFile = new Scanner(myfile);
                    for (int i=0; i<33; i++){
                            if(inputFile.hasNextDouble()){
                                    double d = inputFile.nextDouble();
                                    if (d<0||d>99999){
                                            System.out.println("Not a valid ID.");
                                            System.exit(0);
                                    }
                            }
                            else{
                            String s = inputFile.next();
                            }
                            String extraCredit = inputFile.next();
                            String toBeDoubleOne = extraCredit;
                            Double fromStringOne = new Double(toBeDoubleOne);
                            if (fromStringOne<0||fromStringOne>5){
                                    double error1 = fromStringOne;
                            }
                            String grade = inputFile.next();
                            String toBeDoubleTwo = grade;
                            Double fromStringTwo = new Double(toBeDoubleTwo);
                            if (fromStringTwo<0||fromStringTwo>100.00){
                                    double error2 = fromStringTwo;
                            }
     
                    }
                    inputFile.close();
            }
    This is the error that returns.
        Exception in thread "main" java.util.NoSuchElementException
            at java.util.Scanner.throwFor(Scanner.java:838)
            at java.util.Scanner.next(Scanner.java:1347)
            at Paniagua_Grading.validateData(Paniagua_Grading.java:29)
            at Paniagua_Grading.main(Paniagua_Grading.java:6)
    Thanks in advance!
    Last edited by deejaypanininini; March 8th, 2014 at 07:27 PM. Reason: Formatting


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: What's wrong with my code?

    Your formatting left off the [ and ]
    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.

    My code's not working
    Please explain.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    deejaypanininini (March 8th, 2014)

  4. #3
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    Default Re: What's wrong with my code?

    Did I do it right?

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: What's wrong with my code?

    Exception in thread "main" java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:838)
    at java.util.Scanner.next(Scanner.java:1347)
    at Paniagua_Grading.validateData(Paniagua_Grading.jav a:29)
    The program calls the next() method on line 29 when the isn't any more data to read.
    The Scanner class has a method that will test if there is more data so that the program can test for this condition and keep this error from happening.
    If you don't understand my answer, don't ignore it, ask a question.

  6. #5
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    Default Re: What's wrong with my code?

    Would that be using the while (inputFile.hasNext()) ?

  7. #6
    Super Moderator Norm's Avatar
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    Default Re: What's wrong with my code?

    I don't know about the while() statement, but the hasNext() looks right.
    If you don't understand my answer, don't ignore it, ask a question.

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