JewelHex

public static void main(String[] args) {
        final String s = "QWERTY";
        String result = "";

        for (char ch : s.toCharArray()) {
            if (ch == 'Q')
                result += "A";
            else if (ch == 'W')
                result += "B";
            else if (ch == 'E')
                result += "C";
            else if (ch == 'R')
                result += "D";
            else if (ch == 'T')
                result += "E";
            else if (ch == 'Y')
                result += "F";
        }

        System.out.println(Integer.parseInt(result, 16));
    }