simple2.java

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/*
 * Simple2.java - an example of handling events.
 *    For this example, we will use anonymous inner classes to
 *    implement an ActionListener for each button. This approach
 *    can avoid long switch-type if statements from the approach
 *    used in the Simple1 example.
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Simple2
{
    private static JFrame frame;   // static so main can use it
    private static JPanel myPanel; // panel for the contentPane
    private JButton button1;       // Define out here to make
    private JButton button2;       // visible to ActionListeners

    public Simple2()               // 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 that needs a listener, define an
        // anonymous inner class to implement ActionListener
        button1.addActionListener(
            new ActionListener()
            {
                public void actionPerformed(ActionEvent e)
                {
                    JOptionPane.showMessageDialog(frame,
                                           "Button 1 pressed");
                }
            }
        );

        button2.addActionListener(
            new ActionListener()
            {
                public void actionPerformed(ActionEvent e)
                {
                    JOptionPane.showMessageDialog(frame,
                                            "Button 2 pressed");
                }
            }
        );

        myPanel.add(button1);        // Adds to current JFrame
        myPanel.add(button2);
    }

    public static void main(String s[])
    {
        Simple2 gui = new Simple2(); // Create Simple2 component
        
        frame = new JFrame("Simple2");  // 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);
    }
}