IntelliJ IDEA——跳转至另一个窗口

public class LoginForm {
    private JTextField UserTest;
    private JPanel LoginMainPanel;
    private JPasswordField PWText;
    private JButton LoginBut;

    public LoginForm() {
        JFrame frame = new JFrame("LoginForm");
        frame.setContentPane(LoginMainPanel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setSize(320,180);
        frame.setResizable(false);//设置不可拉伸
        frame.setLocationRelativeTo(null);//设置屏幕居中
        frame.setVisible(true);
        LoginBut.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                OperationForm form = new OperationForm();
                frame.dispose();
            }
        });
    }

    public static void main(String[] args) {
        new LoginForm();
    }


}

public class OperationForm {
    private JPanel OpMainPanel;

    public OperationForm() {
        JFrame frame = new JFrame("OperationForm");
        frame.setContentPane(OpMainPanel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setSize(800,600);
        frame.setResizable(false);//设置不可拉伸
        frame.setLocationRelativeTo(null);//设置屏幕居中
        frame.setVisible(true);
    }

}