simple3.java

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/*
 * 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);
    }
}