public static int [] lengthen(int [] a, int add)
    {
        int [] b = new int [a.length + add];
        for(int i = 0; i < b.length; i++)
        {
            if(i < a.length)
            {
                b[i] = a[i];
            }
            else
            {
                System.out.println("Called at " + i);
                b[i] = 1;
            }
        }
        return b;
    }
    public static void main(String [] args)
    {
        int [] dataSet = {5, 2, 9, 11, 0};
        int addLength = 10;
        int [] x = lengthen(dataSet, addLength);
    }
/*
with some printing stuff I do elsewhere in the code it returns:
The original data set is:
the length is 5
5, 2, 9, 11, 0, 
The lengthen method makes the original data look like this:
Called at 5
Called at 6
Called at 7
Called at 8
Called at 9
Called at 10
Called at 11
Called at 12
Called at 13
Called at 14
the length is 5
5, 2, 9, 11, 0, 
*/