# Information dialog box with 'ok' button JOptionPane.showMessageDialog(frame, "Dialogs Text Content", "Dialogs Title"); # Warning dialog box with 'ok' button JOptionPane.showMessageDialog(frame, "Dialogs Text Content", "Dialogs Title", JOptionPane.WARNING_MESSAGE); # Error dialog box with 'ok' button JOptionPane.showMessageDialog(frame, "Dialogs Text Content", "Dialogs Title", JOptionPane.ERROR_MESSAGE); # No decorator symbol dialog box with 'ok' button JOptionPane.showMessageDialog(frame, "Dialogs Text Content", "Dialogs Title", JOptionPane.PLAIN_MESSAGE); # Custom symbol dialog box with 'ok' button JOptionPane.showMessageDialog(frame, "Dialogs Text Content", "Dialogs Title", JOptionPane.INFORMATION_MESSAGE, icon); # Confirm dialog box with 'yes' 'no' 'cancel' JOptionPane.showConfirmDialog(frame, "Dialogs Text Content");

JMenuBar menuBar; JMenu menu; JMenuItem menuItem; menuBar = new JMenuBar(); menu = new JMenu("File"); menuBar.add(menu); menuItem = new JMenuItem("exit"); menu.add(menuItem); menuItem.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { doExit(); } });

addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { handleExit(); } });

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// exit a JFrame program by doing this: private void doExit() { processEvent(new WindowEvent(this, WindowEvent.WINDOW_CLOSING)); }