Array index out of bounds error

[G. Graz]

I am getting an "java.lang.ArrayIndexOutOfBoundsException" error in the code below I think it might be at sum = average[i]; but I do not see why I am throwing that error ? The array element has an index of 16 , reading off a .txt file . Ok, please let me know if you can see what I am doing incorrectly ? Thank you.

 ArrayList<String> maxList = intFile;

        String[] average = new String [intFile.size()];
        average = intFile.toArray(average);
        String sum = "";
        ArrayList<Integer> testVal = new ArrayList();

        for (int i=0; i <= maxList.size(); i++)
        {
            sum = average[i];
            int value = Integer.parseInt(sum);
             if ( value >= 0 && value <= 100 )
             {
                 testVal.add(value);
                
             }
           
       }    

         Object maxVal = Collections.max(testVal);
         return (String) maxVal.toString();

[Henry Wong]

Besides the file, method, and line number, the exception also tells you which index was being referrenced. It would help if you give us the stacktrace -- at least the fist few lines of it.

Henry

[Campbell Ritchie]

You need to check the format of a for loop when iterating an array. Unfortunately there isn't a good example in the Java Tutorials; you should find something in your textbook. Look at the binary operators very carefully.

[vaibhav mishra]

assuming that you have 16 elements for input here is what you did wrong

consider this line

String[] average = new String [intFile.size()];

you declare a string array with 16 elements , the index being 0 to 15( 15(1st to 15th index ) + 1(0th index ) )
it takes elements from intFile(1st element at 0th index ... 4th element at 3rd index and 16th element at 15th index)
so avarage[15] infact represents your 16th element(15 is the index here)

in the following array iteration for loop at this line

for (int i=0; i <= maxList.size(); i++)  

the <= makes it iterate from 'zero' to 16 th (i.e., your array should have 17 elements)
so just remove '=' sign and change line to

for (int i=0; i < maxList.size(); i++)  

Note: maxList.size() return 16 because you array has 16 elements indexed from 'zero' to 15