code in java 8

        public static int connectedCell(List<List<Integer>> matrix) {
                        int max = 0;
                        for (int i=0; i< matrix.size();i++) {
                                for (int j=0; j< matrix.get(i).size();j++) {
                                        if(matrix.get(i).get(j) == 1) {
                                                int curMax = recurCountConnected(i, j, matrix);
                                                max = Math.max(curMax, max);
                                        }
                                }
                        }
                        return max;
                }

private static int recurCountConnected(int i, int j, List<List<Integer>> matrix) {
    if (i < 0 || j < 0 || i >= matrix.size() || j >= matrix.get(i).size() || matrix.get(i).get(j)==0) {
        return 0;
    }
    int count = 0;
    if (matrix.get(i).get(j)==1) {
        count = 1;
        matrix.get(i).set(j, 0);
        count += recurCountConnected(i-1, j-1, matrix);
        count += recurCountConnected(i-1, j, matrix);
        count += recurCountConnected(i-1, j+1, matrix);
        count += recurCountConnected(i, j-1, matrix);
        count += recurCountConnected(i, j, matrix);
        count += recurCountConnected(i, j+1, matrix);
        count += recurCountConnected(i+1, j-1, matrix);
        count += recurCountConnected(i+1, j, matrix);
        count += recurCountConnected(i+1, j+1, matrix);
    }
    return count;

}

}