simple1.java

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/*
 * Simple1.java - an example of handling events.
 *    For this example, we implement a single ActionListener
 *    which is then used to catch all events. A series of ifs
 *    are used to determine which object caused the event.
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Simple1
{
    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 ActionListener
    
    public Simple1()               // Construct, build GUI
    {
        // Create a panel
        myPanel = new JPanel();
        // Create the buttons.
        button1 = new JButton("Button 1");  // Create buttons
        button2 = new JButton("Button 2");

        SimpleListener ourListener = new SimpleListener();
	// Set action listener for both buttons to share
        button1.addActionListener(ourListener);
        button2.addActionListener(ourListener);

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

    private class SimpleListener implements ActionListener
    {
    /*
     * We will use a simple inner class to implement an
     * ActionListener to use to get the button events. We
     * could have instead used the Simple1 class itself to
     * implement ActionListener instead, but this way is 
     * more consistent with the other examples.
     */
        public void actionPerformed(ActionEvent e)
        {
            // We will use getActionCommand to get the button
            // name, but we could use getSource() instead and
            // the if tests would then be like:
            // if (e.getSource() == button1)  etc.

            String buttonName = e.getActionCommand();
            if (buttonName.equals("Button 1"))
                JOptionPane.showMessageDialog(frame,
                                            "Button 1 pressed");
            else if (buttonName.equals("Button 2"))
                JOptionPane.showMessageDialog(frame,
                                            "Button 2 pressed");
            else
                JOptionPane.showMessageDialog(frame,
                                            "Unknown event");
        }
    }

    public static void main(String s[])
    {
        Simple1 gui = new Simple1(); // Create Simple1 component
        
        frame = new JFrame("Simple1");  // 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);
    }
}