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Thread: Vowel frequency in a string, it compiles but getting error

  1. #1
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    Default Vowel frequency in a string, it compiles but getting error

    import java.util.Scanner;
    public class program4f_4
    {
        public static void main(String args[])
        {
            Scanner sc = new Scanner(System.in);
            System.out.println("Enter a string to see how many times each vowel occurs.");
            String message = sc.nextLine();
            message = message.toLowerCase();
            int length = message.length();
            vowelFrequency(message, length);
     
        }
     
        static public void vowelFrequency(String message, int length)
        {
            int vowelA=0;
            int vowelE=0;
            int vowelI=0;
            int vowelO=0;
            int vowelU=0;
            int x = 0;
            char vowel;
     
            for(x = 0; x <= length; x++)
            {
     
                vowel = message.charAt(x);
                if (vowel == 'a')
                    vowelA++;
                if (vowel == 'e')
                    vowelE++;
                if (vowel == 'i')
                    vowelI++;
                if (vowel == 'o')
                    vowelO++;
                if (vowel == 'u')
                    vowelU++;
     
            }
            System.out.println("Vowel       Occurances");
            System.out.println("A:    " + vowelA);
            System.out.println("E:    " + vowelE);
            System.out.println("I:    " + vowelI);
            System.out.println("O:    " + vowelO);
            System.out.println("U:    " + vowelU);
     
        }
     
    }

    When I run it it highlights "vowel = message.charAt(x);" and the error message is
    "java.lang.StringIndexOutofBoundsException:
    String index out of range: 10 (in java.lang.String)". I'm thinking it has something to do with char variable type?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Vowel frequency in a string, it compiles but getting error

    "java.lang.StringIndexOutofBoundsException: String index out of range: 10 (
    The index value went past the end of the String.
    Remember that index values range from 0 to the String length-1. If the String has 10 characters, the max index is 9.

    In the for loop, stop the loop BEFORE the index gets to the String's length;
    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:

    lordofrandom (March 29th, 2013)

  4. #3
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    Default Re: Vowel frequency in a string, it compiles but getting error

    Thanks a lot.

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