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Thread: ArrayIndexOutOfBoundsException Yelp!

  1. #1
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    Default ArrayIndexOutOfBoundsException Yelp!

    I just need another set of eyes, this is driving me crazy.

    I have a function that takes an array, and tries to find and remove duplicates by storing unique strings in the temp[]. The code produces an ArrayIndexOutOfBoundsException in the inner for loop. I am not too sure why the inner loop exceeds the array index.

        public static String[] removeDup(String[] aStrings){
     
            String[] temp = new String[aStrings.length];
     
            for(int i = 0; i <=temp.length-1;i++){
                temp[i] = "";
     
            }
     
            for(int i = 0; i < temp.length; i++){
     
               [B] for(int j = i+1; i<temp.length; j++){      
     
                    if(!aStrings[i].equals(temp[j]))  [/B]           
     
                        temp[j] = aStrings[i];
     
                }
            }
     
            return temp;
        }
    Last edited by Norm; March 12th, 2019 at 07:39 PM. Reason: Code tags fixed: uses [] not <>

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: ArrayIndexOutOfBoundsException Yelp!

    ArrayIndexOutOfBoundsException in the inner for loop
    Can you copy and paste here the full text of the error message showing the statement number and the value of the bad index?

    why the inner loop exceeds the array index.
    Add a print statement that prints out the value of the index so you can see what the code is doing.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: ArrayIndexOutOfBoundsException Yelp!

    What do you think will happen when the outter for loop is on it's last iteration... the inner for loop is going to start at an index 1 past the length of the array.
    Remember that indexing an array starts at 0

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: ArrayIndexOutOfBoundsException Yelp!

    Try changing the loop indexes' names. For example change i to srcIndx and j to trgtIndx and see if the code looks right and works with those names.
    If you don't understand my answer, don't ignore it, ask a question.