Retrieve the character from hex code

I want to write the hex code / ASCII code of the English alphabets ( A - Z and a - z ) in a file and again want to read those codes (either ASCII or Hex code) from the file to retrieve the characters from them. How it is possible?
For example, ASCII code of 'A' is 65 and hex code is 41.
ASCII code of 'z' is 122 and hex code is 7A.
Avijit

Forgot that you need to convert them back:
        Character c = new Character('A');
        System.out.println("char : "+c);
        int ascii = (int) c.charValue();
        System.out.println("ascii: "+ascii+" => "+(char) ascii);
        String hex = Integer.toHexString(ascii);
        System.out.println("hex  : "+hex +" => "+(char) Integer.parseInt(hex, 16));

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