login java but its in a window and its a program

package com.notjacob.main;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import javax.imageio.ImageIO;
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;


public class Main {

    public static windowstate currentstate;
    public static windowstate laststate;
    public static ArrayList<user> usermap = new ArrayList<user>();
    public static boolean getPasswordMatches(user uzer, String password) {
        return uzer.getPassword().equalsIgnoreCase(password) ? true : false;
    }
    public static boolean getUserExists(String user) {
        for (int i = 0; i < usermap.size(); i++) {
            if (usermap.get(i).getUsername().equalsIgnoreCase(user)) {
                return true;
            }
        }
        return false;
    }
    public static user userFromString(String user) {
        for (int i = 0; i < usermap.size(); i++) {
            if (usermap.get(i).getUsername().equalsIgnoreCase(user)) {
                return usermap.get(i);
            }
        }
        return null;
    }


    public static void main(String[] args) {
        new user("username", "password");
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                initFrame();
                optionsScreen();
            }
        });
    }

    static JFrame frame = new JFrame();
    static PanelBG ControlPanel = new PanelBG();
    static JButton clickButton = new JButton("Confirm");
    static JLabel isvalid = new JLabel("Button not clicked");
    static JTextArea username = new JTextArea();
    static JTextArea password = new JTextArea();
    static JLabel success = new JLabel("Login success!");
    static JButton logout = new JButton("logout");
    static JButton loginButton = new JButton("Login");
    static JButton registerButton = new JButton("Register");
    static JButton clickBu2ton = new JButton("Confirm");
    static JLabel isvalidr = new JLabel("Button not clicked");
    static JTextArea rusername = new JTextArea();
    static JTextArea rpassword = new JTextArea();
    static JButton back = new JButton("back");
    static JLabel configs = new JLabel("Success!");
    public static void initFrame() {
        laststate = windowstate.OPTIONS;
        frame.setTitle("login window");
        frame.setLayout(new BorderLayout());
        frame.add(ControlPanel, BorderLayout.CENTER);
        frame.setSize(new Dimension(800, 650));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setResizable(false);
        ControlPanel.setLayout(new GroupLayout(ControlPanel));
        ControlPanel.add(back);
        back.setBounds(750, 600, 200, 40);
        frame.setVisible(true);
        back.addActionListener((e) -> {
            executeFor(laststate);
            frame.revalidate();
            frame.repaint();
        });

    }
    public static void loingScreen() {
        isvalid.setText("Button not clicked");
        isvalidr.setText("Button not clicked");
        currentstate = windowstate.LOGIN;
        ControlPanel.removeAll();
        ControlPanel.add(back);
        ControlPanel.add(isvalid);
        ControlPanel.add(username);
        ControlPanel.add(password);
        ControlPanel.add(clickButton);
        username.setBounds(100, 100, 200, 40);
        password.setBounds(100, 200, 200, 40);
        isvalid.setBounds(100, 340, 400, 40);
        clickButton.setBounds(100, 200, 340, 40);
        frame.revalidate();
        frame.repaint();
        clickButton.addActionListener((e) -> {
            if (!username.getText().isEmpty()) {
                if (getUserExists(username.getText())) {
                    if (!password.getText().isEmpty()) {
                        if (getPasswordMatches(userFromString(username.getText()), password.getText())) {
                            laststate = windowstate.LOGIN;
                            login();
                        } else {
                            isvalid.setText("invalid password!");
                        }
                    } else {
                        isvalid.setText("add a password!");
                    }
                } else {
                    isvalid.setText("user is not valid!");
                }
            } else {
                isvalid.setText("need a user!");
            }
        });
    }
    public static void optionsScreen() {
        isvalid.setText("Button not clicked");
        isvalidr.setText("Button not clicked");
        currentstate = windowstate.OPTIONS;
        ControlPanel.removeAll();
        ControlPanel.add(back);
        ControlPanel.add(loginButton);
        ControlPanel.add(registerButton);
        loginButton.setBounds(300, 300, 300, 40);
        registerButton.setBounds(300, 400, 300, 40);
        frame.revalidate();
        frame.repaint();
        loginButton.addActionListener((e) -> {
            ControlPanel.remove(loginButton);
            ControlPanel.remove(registerButton);
            ControlPanel.remove(isvalidr);
            ControlPanel.remove(isvalid);
            loingScreen();
        });
        registerButton.addActionListener((e) -> {
            ControlPanel.remove(loginButton);
            ControlPanel.remove(registerButton);
            ControlPanel.remove(isvalidr);
            ControlPanel.remove(isvalid);
            laststate = windowstate.OPTIONS;
            doRegisterScreen();
        });
    }
    public static void doRegisterScreen() {
        isvalid.setText("Button not clicked");
        isvalidr.setText("Button not clicked");
        currentstate = windowstate.REGISTER;
        ControlPanel.removeAll();
        ControlPanel.add(back);
        ControlPanel.add(rpassword);
        ControlPanel.add(rusername);
        ControlPanel.add(isvalidr);
        ControlPanel.add(clickBu2ton);
        rpassword.setBounds(100, 200, 200, 40);
        rusername.setBounds(100, 100, 200, 40);
        isvalidr.setBounds(100, 340, 400, 40);
        clickBu2ton.setBounds(100, 200, 340, 40);
        frame.revalidate();
        frame.repaint();
        clickBu2ton.addActionListener((e) -> {
            if (!rusername.getText().isEmpty()) {
                if (!getUserExists(rusername.getText())) {
                    if (!rpassword.getText().isEmpty()) {
                        new user(rusername.getText(), rpassword.getText());
                        success.setText("Registered!");
                        success.setBounds(40, 40, 100, 40);
                        ControlPanel.add(success);
                        ControlPanel.remove(rpassword);
                        ControlPanel.remove(rusername);
                        ControlPanel.remove(clickBu2ton);
                        laststate = windowstate.REGISTER;
                        optionsScreen();
                    } else {
                        isvalidr.setText("Need a password!");
                    }
                } else {
                    isvalidr.setText("That user already exists!");
                }
            } else {
                isvalidr.setText("Need a username!");
            }
        });
    }
    public static void login() {
        isvalid.setText("Button not clicked");
        isvalidr.setText("Button not clicked");
        currentstate = windowstate.LOGGEDIN;
        ControlPanel.removeAll();
        ControlPanel.add(back);
        username.setText("");
        password.setText("");
        ControlPanel.remove(username);
        ControlPanel.remove(clickButton);
        ControlPanel.remove(isvalid);
        ControlPanel.remove(password);
        success.setText("Logged in!");
        ControlPanel.add(success);
        ControlPanel.add(logout);
        success.setBounds(300, 300, 300, 40);
        logout.setBounds(300, 380, 300, 40);
        frame.revalidate();
        frame.repaint();
        logout.addActionListener((e) -> {
            laststate = windowstate.OPTIONS;
            logout();
        });
    }
    public static void logout() {

        ControlPanel.remove(success);
        ControlPanel.remove(logout);
        success.setText("Logged out!");
        success.setBounds(40, 40, 100, 40);
        ControlPanel.add(success);
        laststate = windowstate.OPTIONS;
        optionsScreen();
    }
    enum windowstate {
        OPTIONS,
        SELECT,
        LOGIN,
        REGISTER,
        LOGGEDIN;

    }
    public static void executeFor(windowstate state) {
        switch(state) {
        case OPTIONS:
                optionsScreen();
                break;
        case SELECT:
                optionsScreen();
                break;
        case LOGIN:
                loingScreen();
                break;
        case REGISTER:
                doRegisterScreen();
                break;
        case LOGGEDIN:
                optionsScreen();
                break;
            default:
                optionsScreen();

        }
    }
}
    class user {
        private final String username;
        private final String password;
        public user(String username, String password) {
            this.username = username;
            this.password = password;
            Main.usermap.add(this);
        }
        public String getPassword() {
            return this.password;
        }
        public String getUsername() {
            return this.username;
        }
    }
    @SuppressWarnings("serial")
    class PanelBG extends JPanel {
         private Image backgroundImage;

          public PanelBG() {
           /* try {
                backgroundImage = ImageIO.read(new File("/Users/georgeblair/Pictures/heic0503a.jpg"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            */
          }

          public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(backgroundImage, 0, 0, this);
          }
    }