java swing close window without exiting app

Question

I have a little frame where I ask user & password. This frame will be opened clicking over a button in a main window.

Then I have two buttons: ok and cancel.

Answer 1

You can call setVisible(false) on the frame.

You might also want to call setDefaultCloseOperation on the frame passing in HIDE_ON_CLOSE (info here: http://java.sun.com/javase/6/docs/api/javax/swing/JFrame.html#setDefaultCloseOperation%28int%29). That will prevent the app from going away if they user hits the "X" on the JFrame to close it.

Answer 2

Use this.dispose(); in the action listener method when the username/password succeeds. eg:

public void actionPerformed(ActionEvent ae) {

    if(ae.getSource()=="button you press to confirm username/password"){
        if(userNameTf.getText().equals(username)&&isPassword(passwordTf.getPassword())){
            new "window to be opened upon success"
            this.dispose(); // calls dispose on this object ie. 
                                            // the login window 
        }
        else{
            userNameTf.setText("");
            passwordTf.setText("");

            JOptionPane.showMessageDialog(this,
                    "Username and/or password is incorrect!",
                    "Attention!",
                    JOptionPane.WARNING_MESSAGE);
        }
    }

}

If you are using inner classes to handle the events just replace 'this.dispose()' with Super_Class_Name.this.dispose();