LeetCode 657 Robot Return to Origin

class Solution {
    public boolean judgeCircle(String moves) {
        int lr = 0;
        int ud = 0;
        for (char c: moves.toCharArray()) {
            if ('U' == c) {
                ud += 1;
                continue;
            }
            if ('D' == c) {
                ud -= 1;
                continue;
            }
            if ('R' == c) {
                lr += 1;
                continue;
            }
            if ('L' == c) {
                lr -= 1;
                continue;
            }
        }
        return ud == 0 && lr == 0;
    }
}