asciiStringToHexString.java

public static String asciiStringToHexString(String strAscii) {
    char[] chars = strAscii.toCharArray();
    StringBuilder stringBuilder = new StringBuilder();
    for (char aChar : chars) {
        String aHex = String.format("%H", aChar);
        stringBuilder.append(aHex);
    }
    String strHex = stringBuilder.toString();
    return strHex;
}
// Ref: https://www.boraji.com/how-to-convert-ascii-to-hex-in-java