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anonymous

  • 5 years ago

in java I am getting an out of bounds exception. working with 2-dim arrays. for(int r=0;r<a.length;r++){ if (getRowTotal(a, r) > getRowTotal(a, (r+1))) { max=getRowTotal(a, r); rowNumber=r; } else max=getRowTotal(a, (r+1)); }

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  1. anonymous
    • 5 years ago
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    So, perhaps you should do a System.out.println(a.length); Which will show you the length of a. Also note that while your loop specifies r<a.length which is the common method of going through the array, your are checking r+1 which would be beyond the length of the array once you get to the last row.

  2. anonymous
    • 5 years ago
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    here is what i switched it to: for(int r=0;r<a.length;r++){ if (getRowTotal(a, r) > max) { max=getRowTotal(a, r); rowNumber=r; } }

  3. anonymous
    • 5 years ago
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    getRowTotal method looks like this: public static int getRowTotal(int[][] a, int row){ int total = 0; for (int i = 0; i < a[row].length; i++) total += a[row][i]; return total; }

  4. anonymous
    • 5 years ago
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    Sorry, not sure if the problem was solved or not. Is it working now? Please note that your running getRowTotal twice. I would assign a variable to get the value and then if it's greater assign that to max rather than having to find the total multiple times. Just makes it a bit more efficient.

  5. anonymous
    • 5 years ago
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    the array a doesn't have a (r+1)th element when r=a.length-1.

  6. anonymous
    • 5 years ago
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    He changed it. It used to, then I commented and he changed it to the current version.

  7. anonymous
    • 5 years ago
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    oh, ok my bad. broinjc probably followed up to post the final solution. i'd consider this one solved.

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