有没有什么方法可以把SHA256哈希串转换成Java串？

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

public class SHA256Converter {
    public static void main(String[] args) {
        String sha256Hash = "SHA256哈希串";

        try {
            // 创建SHA-256消息摘要对象
            MessageDigest digest = MessageDigest.getInstance("SHA-256");

            // 将哈希串转换为字节数组
            byte[] hashBytes = hexStringToByteArray(sha256Hash);

            // 计算字节数组的SHA-256哈希值
            byte[] hash = digest.digest(hashBytes);

            // 将哈希值转换为十六进制字符串
            String javaString = bytesToHexString(hash);

            System.out.println("转换后的Java串：" + javaString);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    // 将十六进制字符串转换为字节数组
    private static byte[] hexStringToByteArray(String hexString) {
        int len = hexString.length();
        byte[] byteArray = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            byteArray[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4)
                    + Character.digit(hexString.charAt(i + 1), 16));
        }
        return byteArray;
    }

    // 将字节数组转换为十六进制字符串
    private static String bytesToHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("%02x", b));
        }
        return sb.toString();
    }
}