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Thread: Index -1 out of bounds

  1. #1
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    Default Index -1 out of bounds

    Can someone explain that error? I do not get what they mean by saying "Index -1", I don't have such an index in my code ??

    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 17
            at LengthSequence.main(LengthSequence.java:16)

    from this code

     int[] numbers = { 1, 1, 2, 3, 3, 4, 5, 2, 4, 5, 6, 7, 8, 9, 6, -1, -2 };
            System.out.println("Original array: " + Arrays.toString(numbers));
     
            int count = 0;
            ArrayList<Integer> consLength = new ArrayList<Integer>();
            for (int i = 0; i < numbers.length; i++) {
                System.out.println("Index i : " + i);
                if (numbers[i - 1] <= numbers[i]) {
                    count++;
                } else {
                    consLength.add(count);
                    count = 0;
                }
            }
            System.out.println(Collections.max(consLength) + 1);


    --- Update ---

    I got it. Since we compare i-1 and 1. That's why.

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Index -1 out of bounds

    Yes, 0 - 1 = -1

    How did you fix the problem?
    If you don't understand my answer, don't ignore it, ask a question.

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