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Thread: Using inputFile.hasNext ?

  1. #1
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    Default Using inputFile.hasNext ?

    I don't know why my code isn't working. It's worked before but I don't know why this time it isn't.
                public static void inputData() throws IOException{
                    Scanner keyboard = new Scanner(System.in);
                    String input;
                    int lines;
                    System.out.println("Please enter a file name: ");
                    input = keyboard.nextLine();
                    File myfile = new File(input);
                    if (!myfile.exists()){
                            System.out.println("File not found.");
                            System.exit(0);
                    }
                    Scanner inputFile = new Scanner(myfile);
                    lines = inputFile.nextInt();
                    System.out.println(lines);
                    int[] array = new int[lines];
                    while (inputFile.hasNext()){
                            for (int i=0; i<=lines; i++){
                                    int moreLines = inputFile.nextInt();
                                    array[i] = moreLines;
                            }
                    }
                    System.out.println(array[3]);
                    inputFile.close();
                }

    Here's what the error returns:
        Exception in thread "main" java.util.NoSuchElementException
            at java.util.Scanner.throwFor(Scanner.java:838)
            at java.util.Scanner.next(Scanner.java:1461)
            at java.util.Scanner.nextInt(Scanner.java:2091)
            at java.util.Scanner.nextInt(Scanner.java:2050)
            at Paniagua_ArrayProcessing.inputData(Paniagua_ArrayProcessing.java:24)
            at Paniagua_ArrayProcessing.main(Paniagua_ArrayProcessing.java:5)
    Last edited by deejaypanininini; March 15th, 2014 at 05:42 PM. Reason: Including error

  2. #2
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    Default Re: Using inputFile.hasNext ?

    The code is expecting a number of ints in the file, but it's finding something else, something that can't be an int. If Scanner specifies the type of data being sought, as in nextInt(), that type of data must be found. Either correct the code to scan for the type of data it will find in the file, OR correct the file to have the type of data the code is looking for.

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

    deejaypanininini (March 15th, 2014)

  4. #3
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    Default Re: Using inputFile.hasNext ?

    The file contains 5 numbers: 0, 1, 5, -9, and -10. Aren't these all in the int range?

    Edit: fixed it. I moved my for loop out and changed the while loop into an if statement and put it in the for loop. All's better for now.
    Last edited by deejaypanininini; March 15th, 2014 at 06:10 PM.

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