java 如何把 00 转换成 0x00 或者 10 转换成 0x10

public static void main(String[] args) {
    String s = "00000018A0010098C68E00989A690000000000BC614E000055AA55AA";
    System.out.println(s);
    byte[] b = HexString2Bytes(s);
    System.out.println(Bytes2HexString(b));
}

/**
 * 将指定byte数组以16进制的形式打印到控制台
 *
 * @param hint String
 * @param b    byte[]
 * @return void
 */
public static void printHexString(String hint, byte[] b) {
    System.out.print(hint);
    for (int i = 0; i < b.length; i++) {
        String hex = Integer.toHexString(b[i] & 0xFF);
        if (hex.length() == 1) {
            hex = '0' + hex;
        }
        System.out.print(hex.toUpperCase() + " ");
    }
    System.out.println("");
}

/**
 * @param b byte[]
 * @return String
 */
public static String Bytes2HexString(byte[] b) {
    String ret = "";
    for (int i = 0; i < b.length; i++) {
        String hex = Integer.toHexString(b[i] & 0xFF);
        if (hex.length() == 1) {
            hex = '0' + hex;
        }
        ret += " 0x" + hex.toUpperCase();
    }
    return ret;
}

/**
 * 将两个ASCII字符合成一个字节； 如："EF"–> 0xEF
 *
 * @param src0 byte
 * @param src1 byte
 * @return byte
 */
public static byte uniteBytes(byte src0, byte src1) {
    byte _b0 = Byte.decode("0x" + new String(new byte[]{src0})).byteValue();
    _b0 = (byte) (_b0 << 4);
    byte _b1 = Byte.decode("0x" + new String(new byte[]{src1})).byteValue();
    byte ret = (byte) (_b0 ^ _b1);
    return ret;
}

/**
 * 将指定字符串src，以每两个字符分割转换为16进制形式 如："2B44EFD9" –> byte[]{0x2B, 0×44, 0xEF,
 * 0xD9}
 *
 * @param src String
 * @return byte[]
 */
public static byte[] HexString2Bytes(String src) {
    if (null == src || 0 == src.length()) {
        return null;
    }
    byte[] ret = new byte[src.length() / 2];
    byte[] tmp = src.getBytes();
    for (int i = 0; i < (tmp.length / 2); i++) {
        ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
    }
    return ret;
}