Interaction between ArrayList, Char Array and String

Euler.java

 ArrayList<Character> array =new ArrayList();
        ArrayList currentWindow=new ArrayList();

        for (int i=0;i<str.length();i++){
            if (str.charAt(i)!='\n')
                array.add(str.charAt(i));
        }
        int maxProduct=1;
        int whereIsMax=0;
        for (int i=0;i<5;i++)
            maxProduct*= Character.getNumericValue(array.get(i));

        for (int i=2; i+3<array.size();i++)
        {
            currentWindow=(new ArrayList<Character> (array.subList(i-2,i+3)));

            if (findMovingAverage(currentWindow)>maxProduct){
                whereIsMax=i;
                maxProduct=findMovingAverage(currentWindow);
            }

        }
        System.out.println(maxProduct);