String Test = "n KIAsusad3;ds;das98d A"
        
        StringBuilder Res = new StringBuilder();
        String Temp;
        Res.append("0x");
        try {
            byte[] bytes = Test.getBytes("Windows-1251");
            for (int k = 0; k < Test.length(); k++){
                Temp = "00" + Integer.toHexString(Integer.valueOf(bytes[k]));
                Res.append(Temp.substring(Temp.length() - 2));
            }
        } catch (UnsupportedEncodingException ex) {
            System.out.println(ex.getMessage());
        }