Converting ISBN number of a Book to HexaDecimal for Writing To RFID tags

Question

I am in the process of Writing ISBN values to UHF RFID cards , So that I need to scan the barcode of the book and to receive the ISBN and then I need to convert that ISBN of(13 digit integer) to hexadecimal value to write to the UHF RFID tags.

As of now I can able to Scan the barcode and receive the ISBN number, but I need some help on converting ISBN to hexadecimal value for writing to the UHF RFID tags in Java.

Answer 1

You can use Long.valueOf(isbnString, 16) . Create a method toHex and if input string contains "-" then replace them with empty String , after that create and return the number. Please note that Long.valueOf can throw NumberFormatException E.g.

public static Long toHex(String isbn) {
    String temp = isbn;
    if (isbn.length() > 10) {
        temp = isbn.replaceAll("-", "");
    }

    return Long.valueOf(temp, 16);
}

public static void main(String[] args) {
        Long isbn1 = 9780071809L;
        Long isbn2 = 9780071809252L;

        System.out.println(toHex(isbn1.toString()));
        System.out.println(toHex(isbn2.toString()));
        System.out.println(toHex("978-0071809252"));
    }

Answer 2

   BigInteger toHex=new BigInteger(dec,10);// use this to convert your number to big integer so that any number can be stored where dec is your input number in base 10 in string
     String s=toHex.toString(16);//convert your number into hexa string which can be directly stored in rfid tag