import java.awt.Dimension; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; class AboutDialog extends JDialog { public AboutDialog() { setTitle("About"); setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS)); add(Box.createRigidArea(new Dimension(0, 10))); JLabel name = new JLabel("Notes"); name.setAlignmentX(0.5f); add(name); add(Box.createRigidArea(new Dimension(0, 100))); JButton close = new JButton("Close"); close.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { dispose(); } }); close.setAlignmentX(0.5f); add(close); setModalityType(ModalityType.APPLICATION_MODAL); setDefaultCloseOperation(DISPOSE_ON_CLOSE); setSize(300, 200); } } public class SimpleDialog { public static void main(String[] args) { JMenuBar menubar = new JMenuBar(); JMenu file = new JMenu("File"); file.setMnemonic(KeyEvent.VK_F); JMenu help = new JMenu("Help"); help.setMnemonic(KeyEvent.VK_H); JMenuItem about = new JMenuItem("About"); help.add(about); about.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { AboutDialog ad = new AboutDialog(); ad.setVisible(true); } }); menubar.add(file); menubar.add(help); JFrame f = new JFrame(); f.setJMenuBar(menubar); f.setSize(300, 200); f.setLocationRelativeTo(null); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); } }