Vote Counting Machine

/*Design a vote counting machine that can input valid candidates' names and vote cast list, we need your help to write a f
unction to find the number of votes cast against each good candidate, invalid vote counts, and finally the winner's name.

Note: If two candidates have the same votes then the winner can be 
finalized based on the order of valid candidates. If the number of i
invalid ballots is more or if the vote casted list is empty then output Winner = N/A*/


public class question169 {
    public static void countVotes(char[] arr) {
        int a = 0;
        int b = 0;
        int c = 0;
        int d = 0;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] == 'A') {
                a++;
            }
            if (arr[i] == 'B') {
                b++;
            }
            if (arr[i] == 'C') {
                c++;
            }
            if (arr[i] != 'A' && arr[i] != 'C' && arr[i] != 'B') {
                d++;
            }
        }

        System.out.println("A=" + a);
        System.out.println("B=" + b);
        System.out.println("C=" + c);
        System.out.println("inavlid votes=" + d);

        if (arr.length == 0) {
            System.out.println("winner=N/A");
        }

        if (arr.length > 0) {
            if (a >= b && a >= c && a > d) {
                System.out.println("winner=" + 'A');
            }
            if (b > a && b >= c && b > d) {
                System.out.println("winner=" + 'B');
            }
            if (c > b && c > a && c > d) {
                System.out.println("winner=" + 'C');
            }
            if (d > b && d > a && d > c) {
                System.out.println("winner=N/A");
            }
        }

        if (d == b || d == a || d == c) {
            System.out.println("winner=N/A");
        }

    }

    public static void main(String[] args) {
        char arr[] = { 'A', 'B', 'C', 'D', 'F', 'L', 'A', 'A', 'A', 'A', '9', '8', };
        countVotes(arr);
    }
}