Open JPanel after clicking a button in JFrame

Question

I know this question has been asked, but I could not find a solution.

I created JFramefor login, and I want, after clicking the "Cont Nou" button, to open a new window using jpanel for a new account, but I don’t know how to delete the original frame and display the frame with jpanel. Do you have an idea? Thank! This is what I have done so far:

This is JFramewith login:

public class LogIn extends JFrame implements ActionListener{

    private JLabel labelEmail;
    private JLabel labelParola;
    private JTextField textFieldEmail;
    private JPasswordField textFieldParola;
    private JButton buttonLogin;
    private JButton buttonContNou;
    public LogIn (){
        super();
        this.setSize(400,200);
        this.setTitle("Login");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLayout(null);
        this.setResizable(false);
        this.setupComponents();
    }
    private void setupComponents(){

        labelEmail = new JLabel("Email: ");
        labelParola = new JLabel("Parola: ");
        textFieldEmail = new JTextField();
        textFieldParola = new JPasswordField();
        buttonContNou = new JButton("Cont Nou");
        buttonLogin = new JButton("Login");

        labelEmail.setBounds(30,30,50,20);
        labelParola.setBounds(30,70,50,20);
        textFieldEmail.setBounds(100,30,185,20);
        textFieldParola.setBounds(100,70,185,20);
        buttonContNou.setBounds(185,110,100,20);
        buttonLogin.setBounds(100,110,75,20);

        buttonLogin.addActionListener(this);
        buttonContNou.addActionListener(this);

        this.add(labelEmail);
        this.add(labelParola);
        this.add(textFieldEmail);
        this.add(textFieldParola);
        this.add(buttonLogin);
        this.add(buttonContNou);

    }

   public static void main(String[] args){

       LogIn login= new LogIn();
       login.setVisible(true);
   }

   @Override
   public void actionPerformed(ActionEvent e) {

       if(e.getSource().equals(buttonLogin)){
          boolean toateDateleOk =true;
          textFieldEmail.setBackground(Color.WHITE);
          textFieldParola.setBackground(Color.WHITE);
          if(textFieldEmail.getText().length()==0){
              textFieldEmail.setBackground(Color.RED);
              toateDateleOk =false;
          }
          if(textFieldParola.getPassword().length==0){
              textFieldParola.setBackground(Color.RED);
              toateDateleOk =false;
          }
          if(!toateDateleOk)
              return ;
          else 
             System.out.println("Incepe Procesul de logare");
         if(e.getSource().equals(buttonContNou)){
                //this.dispose();
                //dispose();
                //new NewAccountPanel().setVisible(true);   
                //new secondTab().show();
            }   
         }
   }
}

Answer 1

, , , , JFrame. , , , ( ) . .

, , . JFrames, Good/Bad Practice? .

MVC (Model-View-Controller), / .

()

, , ,

View

. ( C) , JComponent, Container

public interface View<C> {

    public JComponent getView();
    public void setController(C controller);
    public C getController();

}

LoginView

, , , , , . reset ,

public interface LoginView extends View<LoginController> {

    public String getUserName();
    public char[] getPassword();

    public void loginFailed(String errorMessage);

}

LoginController

, , , , - ...

public interface LoginController {

    public void performLogin(LoginView view);
    public void loginCanceled(LoginView view);

}

ApplicationView

, , , .

LoginPane

LoginView...

public class LoginPane extends JPanel implements LoginView {

    private JTextField userName;
    private JPasswordField password;
    private JButton okButton;
    private JButton cancelButton;
    private LoginController controller;

    public LoginPane() {
        setLayout(new GridBagLayout());
        userName = new JTextField(10);
        password = new JPasswordField(10);
        okButton = new JButton("Ok");
        cancelButton = new JButton("Cancel");

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.insets = new Insets(2, 2, 2, 2);
        gbc.anchor = GridBagConstraints.WEST;

        add(new JLabel("User name: "), gbc);
        gbc.gridy++;
        add(new JLabel("Password: "), gbc);

        gbc.gridx = 1;
        gbc.gridy = 0;
        gbc.gridwidth = 2;
        add(userName, gbc);
        gbc.gridy++;
        add(password, gbc);

        gbc.gridwidth = 1;
        gbc.gridy++;
        add(okButton, gbc);
        gbc.gridx++;
        add(cancelButton, gbc);

        okButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                getController().performLogin(LoginPane.this);
            }
        });

        cancelButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                getController().loginCanceled(LoginPane.this);
            }
        });
    }

    @Override
    public String getUserName() {
        return userName.getText();
    }

    @Override
    public char[] getPassword() {
        return password.getPassword();
    }

    @Override
    public void loginFailed(String errorMessage) {
        JOptionPane.showMessageDialog(this, errorMessage, "Login failed", JOptionPane.ERROR_MESSAGE);
    }

    @Override
    public void setController(LoginController controller) {
        this.controller = controller;
    }

    @Override
    public JComponent getView() {
        return this;
    }

    @Override
    public LoginController getController() {
        return controller;
    }

}

ApplicationPane

View

public class ApplicationPane extends JPanel implements View {

    public ApplicationPane() {
        setLayout(new GridBagLayout());
        add(new JLabel("Welcome to my awesome application"));
    }

    @Override
    public JComponent getView() {
        return this;
    }

    @Override
    public void setController(Object controller) {
        // What ever controller you want to use...
    }

    @Override
    public Object getController() {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

}

...

, , ?

public class CoreApplicationCPane extends JPanel {

    protected static final String LOGIN_VIEW = "View.login";
    protected static final String APPLICATION_VIEW = "View.application";

    private LoginView loginView;
    private ApplicationPane applicationView;
    private CardLayout cardLayout;

    public CoreApplicationCPane() {

        cardLayout = new CardLayout();
        setLayout(cardLayout);

        loginView = new LoginPane();
        applicationView = new ApplicationPane();
        add(loginView.getView(), LOGIN_VIEW);
        add(applicationView.getView(), APPLICATION_VIEW);
        loginView.setController(new LoginController() {

            @Override
            public void performLogin(LoginView view) {
                // Do what ever you need to do...
                String name = view.getUserName();
                char[] password = view.getPassword();
                //...

                cardLayout.show(CoreApplicationCPane.this, APPLICATION_VIEW);
            }

            @Override
            public void loginCanceled(LoginView view) {
                SwingUtilities.windowForComponent(CoreApplicationCPane.this).dispose();
            }
        });

        cardLayout.show(this, LOGIN_VIEW);

    }

}

, . LoginView ApplicationView , .

:

• CardLayout

.

Java GUI - ActionListeners MVC?

Answer 2

,

setVisible(true);

?

setVisible(false);

Answer 3

JFrame dispose(), JFrame.
, JFrame :

JFrame newFrame = new JFrame();
newFrame.setVisible(true);
this.dispose();

() . , ( ), , , . , JFrames . .