public static boolean checkPwd(String pwd){

        if(pwd.matches("^[A-Za-z0-9]{8,32}$")){
            Pattern numPattern =Pattern.compile("[0-9]+");
            Pattern lowerPattern =Pattern.compile("[a-z]+");
            Pattern upperPattern =Pattern.compile("[A-Z]+");
            if(numPattern.matcher(pwd).find() && lowerPattern.matcher(pwd).find() && upperPattern.matcher(pwd).find()){
                return true;
            }
        }
        return false;
    }