leetcode393. UTF-8 编码验证

class Solution {
    public boolean validUtf8(int[] data) {  
        int numberOfBytesToProcess = 0;
  
        for (int i = 0; i < data.length; i++) {
            String binRep = Integer.toBinaryString(data[i]);
            binRep =
                binRep.length() >= 8
                    ? binRep.substring(binRep.length() - 8)
                    : "00000000".substring(binRep.length() % 8) + binRep;
            if (numberOfBytesToProcess == 0) {
                for (int j = 0; j < binRep.length(); j++) {
                    if (binRep.charAt(j) == '0') {
                        break;
                    }
                    numberOfBytesToProcess += 1;
                }
                if (numberOfBytesToProcess == 0) {
                    continue;
                }
                if (numberOfBytesToProcess > 4 || numberOfBytesToProcess == 1) {
                    return false;
                }
            } else {
                if (!(binRep.charAt(0) == '1' && binRep.charAt(1) == '0')) {
                    return false;
                }
            }
            numberOfBytesToProcess -= 1;
        }
        return numberOfBytesToProcess == 0;
    }
}