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  1. #1
    Bit_Void is offline Member
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    Default Help With Sorting Array Please!

    I'm making a method to take an array of integers and rearrange the numbers from least to greatest, using for loops. I'm getting the error "java.lang.ArrayIndexOutOfBoundsException: 8," and I don't know why. What should I do to fix the code?

    Portion of the ArrayMethods class with the sorting method
    Java Code:
    public static Integer[] sortArray (Integer[] a)
          int swap;
          for (int i = 0; i < a.length; i++)
              for (int j = 1; j < a.length; j++)
                  int x = j + 1;
                  if (a[j] > a[x])
                      swap = a[j];
                      a[j] = a[j+1];
                    a[j+1] = swap;
          return a;
    Portion of the Driver that uses the code
    Java Code:
    import java.util.Arrays;
    public class ArrayMethodsDriver
      public static void main(String[] args)
        Integer[] a = {7,8,8,3,4,9,8,7};
    Upon running, if (a[j] > a[x]) is highlighted.

    Thanks a ton for any help.

  2. #2
    kneitzel is offline Senior Member
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    Default Re: Help With Sorting Array Please!

    Your loop with j goes from 1 to array length-1 and then you add 1 for variable x.
    So your x value goes from 2 to array length.
    But the elements in an array go from 0 to length-1 only, you cannot access an element length.
    E.g. an array with 3 elements has the elements 0,1 and 2.


  3. #3
    jim829 is online now Senior Member
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    Default Re: Help With Sorting Array Please!

    Similarly, you are ignoring your 0th value in the sort.

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  4. #4
    JosAH's Avatar
    JosAH is offline Moderator
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    Default Re: Help With Sorting Array Please!

    ... also, your sort method compares too many elements (so it is slower than it has to be; check your loops).

    kind regards,

    The only person who got everything done by Friday was Robinson Crusoe.

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