在java对象中存储大十六进制数（md5）的最有效方法

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Example {
    public static String calculateMD5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(input.getBytes());
            StringBuilder hexString = new StringBuilder();
            for (byte b : messageDigest) {
                String hex = Integer.toHexString(0xFF & b);
                if (hex.length() == 1) {
                    hexString.append('0');
                }
                hexString.append(hex);
            }
            return hexString.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        String input = "Hello World";
        String md5 = calculateMD5(input);
        System.out.println("MD5: " + md5);
    }
}

public class MyObject {
    private String md5;

    public String getMd5() {
        return md5;
    }

    public void setMd5(String md5) {
        this.md5 = md5;
    }
}