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Java swing two indipendent frames

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I have a main frame of my application and i want to have another frame for login. So i have written two classes: a Main class and a LoginFrame class.

/*Imported classes*/public class Main {    private JFrame frame;    private LoginFrame loginFrame;    /**     * Launch the application.     */    public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() {            public void run() {                try {                    Main window = new Main();                    window.frame.setVisible(true);                } catch (Exception e) {                    e.printStackTrace();                }            }        });    }    /**     * Create the application.     */    public Main() {        initialize();    }    /**     * Initialize the contents of the frame.     */    private void initialize() {        frame = new JFrame("Main Frame");        frame.setBounds(100, 100, 450, 300);        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        frame.getContentPane().setLayout(null);        JPanel mainPanel = new JPanel();        mainPanel.setBounds(10, 10, 426, 243);        frame.getContentPane().add(mainPanel);        mainPanel.setLayout(null);        loginFrame = new LoginFrame("Login...");        loginFrame.setVisible(true);        loginFrame.pack();    }}
/*Imported classes*/public class LoginFrame extends JFrame {    private JFrame frame;    private JTextField usernameField;    private JPasswordField passwordField;    /**     * Launch the application.     */    /*public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() {            public void run() {                try {                    LoginFrame window = new LoginFrame("Login...");                    window.frame.setVisible(true);                } catch (Exception e) {                    e.printStackTrace();                }            }        });    }*/    /**     * Create the application.     */    public LoginFrame(String title) {    /**     * Initialize the contents of the frame.     */        frame = new JFrame(title);        frame.setBounds(100, 100, 450, 300);        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        frame.getContentPane().setLayout(null);        JPanel panel = new JPanel();        panel.setBounds(0, 10, 426, 243);        frame.getContentPane().add(panel);        panel.setLayout(null);        JLabel userLabel = new JLabel("User:");        userLabel.setFont(new Font("Dialog", Font.BOLD, 14));        userLabel.setEnabled(true);        userLabel.setBounds(41, 78, 45, 13);        panel.add(userLabel);        JLabel passwordLabel = new JLabel("Password:");        passwordLabel.setFont(new Font("Tahoma", Font.BOLD, 14));        passwordLabel.setBounds(41, 124, 76, 13);        panel.add(passwordLabel);        usernameField = new JTextField();        usernameField.setBounds(165, 75, 173, 19);        panel.add(usernameField);        usernameField.setColumns(10);        passwordField = new JPasswordField();        passwordField.setColumns(10);        passwordField.setBounds(165, 123, 173, 19);        panel.add(passwordField);        JLabel loginLabel = new JLabel("Enter Username and Password");        loginLabel.setFont(new Font("Tahoma", Font.BOLD, 16));        loginLabel.setBounds(79, 22, 259, 13);        panel.add(loginLabel);        JButton resetLoginButton = new JButton("Reset");        resetLoginButton.setFont(new Font("Tahoma", Font.BOLD, 14));        resetLoginButton.setBounds(318, 189, 85, 21);        panel.add(resetLoginButton);        JButton okLoginButton = new JButton("Ok");        okLoginButton.setFont(new Font("Tahoma", Font.BOLD, 14));        okLoginButton.setBounds(217, 189, 85, 21);        panel.add(okLoginButton);    }}

what i get is the two frames:

https://i.stack.imgur.com/Fl2GO.png

When i open the login frame there is nothing (buttons and text fields).What is the problem? Is it a right way to implement a login frame?

I expect two different frame the main one empty. The second one with two fields one for username and the other with password and two buttons.


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