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Thread: Mysterious ArrayIndexOutOfBoundsException

  1. #1
    Join Date
    Feb 2012

    Mysterious ArrayIndexOutOfBoundsException

    I'm trying to call a method that prints the first and third quartiles of a data set (array of doubles), and to do that it needs to check whether or not the array of doubles has been sorted (using Array.sort() ). To check if the array has been sorted, I use static boolean isSorted(double[] data).

          static boolean isSorted(double[] data)
    		int biggerCount = 0;
    		for(int m = 0; m<data.length;m++)
    			if(data[m] != Math.min(data[m], data[m+1]) )
    		if(biggerCount == 0)
    			return true;
    			return false;
    On the line containing the if-statement, I get the ArrayIndexOutOfBoundsException, when running the driver program. Any ideas as to how to fix this?

  2. #2
    Join Date
    Dec 2002
    Calgary, Canada
    problem has to be with the following part
    if(data[m] != Math.min(data[m], data[m+1])
    m+1 goes out of bounds. Look into it and make sure why you have to do m+1, if you must then you have check the array length so that it doesnt go beyond that such as
    if((m+1)<data.length && data[m] != Math.min(data[m], data[m+1])

    but u have to see what is your logic and why you are going beyond array limit


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