//package ex1; import java.awt.*; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JButton; import javax.swing.JComponent; import java.awt.Toolkit; import java.awt.BorderLayout; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class LeBeeper extends JPanel implements ActionListener { JButton button, button2, button3, button4, button5; public LeBeeper() { super(new BorderLayout()); button = new JButton("Click Me"); button.setPreferredSize(new Dimension(200, 80)); add(button, BorderLayout.CENTER); button.addActionListener(this); button2 = new JButton("Click Me"); button2.setPreferredSize(new Dimension(200, 80)); add(button2, BorderLayout.NORTH); button2.addActionListener(this); button3 = new JButton("Click Me"); button3.setPreferredSize(new Dimension(200, 80)); add(button3, BorderLayout.SOUTH); button3.addActionListener(this); button4 = new JButton("Click Me"); button4.setPreferredSize(new Dimension(200, 80)); add(button4, BorderLayout.EAST); button4.addActionListener(this); button5 = new JButton("Click Me"); button5.setPreferredSize(new Dimension(200, 80)); add(button5, BorderLayout.WEST); button5.addActionListener(this); } public void actionPerformed(ActionEvent e) { if(e.getSource()==button) System.exit(0); else if(e.getSource()==button3) Toolkit.getDefaultToolkit().beep(); else if(e.getSource()==button2){ Toolkit.getDefaultToolkit().beep(); try { Thread.sleep(100); } catch (InterruptedException e1) {} Toolkit.getDefaultToolkit().beep(); } else if(e.getSource()==button4) { Toolkit.getDefaultToolkit().beep(); for(int i=0; i<20; i++) { try { Thread.sleep(50); } catch (InterruptedException e1) { } Toolkit.getDefaultToolkit().beep(); } } } private static void createAndShowGUI() { JFrame.setDefaultLookAndFeelDecorated(true); JFrame frame = new JFrame("Beeper"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. JComponent newContentPane = new LeBeeper(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); createAndShowGUI(); createAndShowGUI(); createAndShowGUI(); createAndShowGUI(); } }