public Employee(String firstName, String lastName,
                String userID, String userPassword, String role)
{
    try{
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/hotelmanagementsystem",                            "some_user","");

        PreparedStatement statement = con.prepareStatement("Insert into employee(Firstname, Lastname, UserID, UserPassword, Role)values(?, ?, ?, ?, ?");
        statement.setString(1, firstName);
        statement.setString(2, lastName);
        statement.setString(3, userID);
        statement.setString(4, userPassword);
        statement.setString(5, role);
        statement.executeUpdate();

        con.close();
    }
    catch( Exception e ) {
        e.printStackTrace();
        return;
    }
}

PreparedStatement statement = con.prepareStatement("Insert into employee(Firstname, Lastname, UserID, UserPassword, Role)values(?, ?, ?, ?, ?");

PreparedStatement statement = con.prepareStatement("Insert into employee(Firstname, Lastname, UserID, UserPassword, Role)values(?, ?, ?, ?, ?)");

PreparedStatement statement = con.prepareStatement("Insert into employee(Firstname, Lastname, UserID, UserPassword, Role)values(?, ?, ?, ?, ?");

PreparedStatement statement = con.prepareStatement("Insert into employee(Firstname, Lastname, UserID, UserPassword, Role)values(?, ?, ?, ?, ?)");

PreparedStatement statement = con.prepareStatement("Insert into employee(Firstname, Lastname, UserID, UserPassword, Role)values(?, ?, ?, ?, ?)");