Why are my JFrames closing?

[Shanna Ripley]

Hi All

I'm trying to create my own instant messenger and have come across a problem. I have a log in form, when the user enters their name. Once they click 'Log In', another window opens displaying the users that are currently online. My problem arises when I want to close the log in form. When I close this the other window that displays the online users also closes. Does anyone know why this happens??

Thanks in advance.

    

public class LogIn extends JFrame implements ActionListener{

    private JLabel label;
    private JTextField nameField;
    private JButton login;

    public LogIn()
    {
        super("Log In");
        setSize(300, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        initComponents();
        setVisible(true);
    }

    private void initComponents()
    {
        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        panel.add(Box.createRigidArea(new Dimension(0, 30)));
        label = new JLabel("Enter Name:");
        panel.add(label);
        panel.add(Box.createRigidArea(new Dimension(0,50)));
        nameField = new JTextField(15);
        panel.add(nameField);
        panel.add(Box.createRigidArea(new Dimension(0, 60)));
        login = new JButton("Log In");
        login.addActionListener(this);
        panel.add(login);

        add(panel);
    }

    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource() == login)
        {
            // create new client
            String name = nameField.getText();
            Client client = new Client(name);
        }
    }

    public static void main(String[] args)
    {
        LogIn logIn = new LogIn();
    }
}

   

public class myClient extends JFrame implements ActionListener{

    Socket socket;
    BufferedReader input;
    PrintWriter output;

    JTextArea incomingMsgs;
    JTextField msgField;
    JTextField txtName;
    JList list;
    DefaultListModel listModel;
    JButton send;


    public myClient()
    {
        super("Client Side");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 480);
        createGUI();
        makeConnection();
        setVisible(true);
    }

    public void createGUI()
    {
        JPanel panel = new JPanel();
        BorderLayout bLayout = new BorderLayout();
        setLayout(bLayout);
        
        incomingMsgs = new JTextArea(17,23);
        JScrollPane scroll = new JScrollPane(incomingMsgs);
        panel.add(scroll);

        JPanel panel2 = new JPanel();
        msgField = new JTextField(10);
        txtName = new JTextField("name", 10);
        send = new JButton("Send");
        send.addActionListener(this);
        panel2.add(msgField);
        panel2.add(txtName);
        panel2.add(send);

        JPanel panel3 = new JPanel();
        String temp[] = {"North", "South"};
        listModel = new DefaultListModel();
        listModel.addElement("shanna");
        list = new JList(listModel);
        //list.addListSelectionListener(new ListSelectionListener()
        //{
            //public void valueChanged(ListSelectionEvent e)
            //{
                //int index = list.getSelectedIndex();
                //String listIndex = (String)listModel.get(index);
                //output.println("#private# " + listIndex);
            //}
        //});
        panel3.add(list);

        add(panel, bLayout.EAST);
        add(panel2, bLayout.SOUTH);
        add(panel3, bLayout.WEST);
    }

}



 

[pete stein]

What do you think the indicated line does?

    public LogIn()
    {
        super("Log In");
        setSize(300, 300);


        // ***** what does this line do?  *****
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        initComponents();
        setVisible(true);
    }

Having said this, I'll also say that perhaps the login window ought to be a dialog and not a JFrame. Then this would be a moot issue.

Much luck!

[Thiagu Sin]

Why not you try DISPOSE_ON_CLOSE or HIDE_ON_CLOSE because EXIT_ON_CLOSE calls Syste.exit(0) and exits the whole application. Dispose_on_close will only close the whole program when there are no active threads running and Hide_on_close will just hide your log-in window. Like what pete stein said why not try JDialog, its more relevant for the current situation.

http://java.sun.com/docs/books/tutorial/uiswing/components/frame.html