/* * Simple3.java - an example of handling events. *    For this example, we will use inner member classes to *    implement an ActionListener for each button. This approach *    can avoid some of the code clutter that anonymous classes *    can sometimes cause. It also concentrates the action code *    all in one place, and allows synonyms. */import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Simple3 extends JPanel{    private static JFrame frame;    // static so main can use it    private static JPanel myPanel;  // a panel for contentPane    private JButton button1;        // Define out here to make    private JButton button2;        // visible to ActionListener        // Define handlers for each event needed (button1, button2)    private class Button1Handler implements ActionListener    {        public void actionPerformed(ActionEvent e)        {            JOptionPane.showMessageDialog(frame,                                         "Button 1 pressed");        }    }        private class Button2Handler implements ActionListener    {        public void actionPerformed(ActionEvent e)        {            JOptionPane.showMessageDialog(frame,                                         "Button 2 pressed");        }    }        public Simple3()                // Construct, build GUI        {        // Create a panel        myPanel = new JPanel();        // Create the buttons        button1 = new JButton("Button 1");        button2 = new JButton("Button 2");        // For each component add it ActionListener class        button1.addActionListener(new Button1Handler());        button2.addActionListener(new Button2Handler());        myPanel.add(button1);        // Adds to current JFrame        myPanel.add(button2);    }    public static void main(String s[])    {        Simple3 gui = new Simple3();  // Simple3 component        frame = new JFrame("Simple3");  // JFrame for the panel        // Standard idiom to catch close event        frame.addWindowListener(new WindowAdapter() {             public void windowClosing(WindowEvent e)              {System.exit(0);} });        frame.getContentPane().add(myPanel);        frame.pack();                   // Ready to go        frame.setVisible(true);    }}