How to encode a hex SHA256 in Java

Sha.java

import java.security.*;
public class Sha {
    public static String hash256(String data) throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(data.getBytes());
        return bytesToHex(md.digest());
    }
    public static String bytesToHex(byte[] bytes) {
        StringBuffer result = new StringBuffer();
        for (byte byt : bytes) result.append(Integer.toString((byt & 0xff) + 0x100, 16).substring(1));
        return result.toString();
    }
}

For base64: https://www.owasp.org/index.php/Hashing_Java

BASE64Decoder decoder = new BASE64Decoder();
return decoder.decodeBuffer(data);