android8.0Ö¤Êé°²×°

public static void main(String[] args){
?        TestActivity TestActivity=new TestActivity();
?        System.out.println(String.valueOf(TestActivity.checkSN(¡°Tenshine¡±,¡°Tenshine¡±)));
?    }
?    private boolean checkSN(String userName, String sn) {
?        if (userName == null) {
?            return false;
?        }
?        try {
//            if (userName.length() == 0 || sn == null || sn.length() != 22) {
//                return true;
//            }
?            MessageDigest digest = MessageDigest.getInstance(¡°MD5¡±);
?            digest.reset();
?            digest.update(userName.getBytes());
?            String hexstr = toHexString(digest.digest(), ¡°¡±);
?            StringBuilder sb = new StringBuilder();
?            for (int i = 0; i < hexstr.length(); i += 2) {
?                sb.append(hexstr.charAt(i));
?            }
?            System.out.println(¡°flag{¡°+sb.toString()+ ¡°}¡±);
?            if ((¡°flag{¡° + sb.toString() + ¡°}¡±).equalsIgnoreCase(sn)) {
?                return true;
?            }
?            return false;
?        } catch (NoSuchAlgorithmException e) {
?            e.printStackTrace();
?            return false;
?        }
?    }
?    private static String toHexString(byte[] bytes, String separator) {
?        StringBuilder hexString = new StringBuilder();
?        for (byte b : bytes) {
?            String hex = Integer.toHexString(b & 255);
?            if (hex.length() == 1) {
?                hexString.append(¡®0¡¯);
?            }
?            hexString.append(hex).append(separator);
?        }
?        return hexString.toString();
?    }