JButton btnSignup = new JButton("Signup");
    btnSignup.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {

            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root","");
                Statement stmt = con.createStatement();
                String sql = "Insert into logindb(User,
    pass) values (?,?)";
    catch(Exception e) {
                System.out.print(e);

            }
        }
    }
            );