array_summation.mj 621 Bytes
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public class Summator {

    public int sum(int[] array, int len) {
        int sum = 0;
        int i = 0;
        while(i < len) {
            sum += array[i];
            i += 1;
        }
        return sum;
    }

    public static void main(String[] args) {

        acc = new Summator();

        int arrayLen = System.in.read();
        int[] array = new int[arrayLen];

        int i = 0;
        while(i < arrayLen) {
            array[i] = System.in.read();
            i += 1;
        }

        int arraySum = acc.sum(array, arrayLen);
        System.out.write(arraySum);
        System.out.flush();
    }
}