// 1.1 version of HelloSwing program.

import java.awt.GridLayout;
import java.awt.event.*;
import com.sun.java.swing.*; 

public class HelloSwing extends JFrame implements ActionListener {
    private JLabel label;
    private static String labelPrefix = "Number of button clicks: ";
    private int numClicks = 0;

    public HelloSwing() {
        super("HelloSwing");

        JButton button = new JButton("I'm a Swing button!");
        button.setMnemonic('i');
        button.addActionListener(this);
	button.getAccessibleContext().setAccessibleDescription(
		"When you click this button, the label is updated "
	      + "to display the total number of button clicks.");

        label = new JLabel(labelPrefix + "0    ");

        JPanel pane = new JPanel();
        pane.setBorder(BorderFactory.createEmptyBorder(30, 30, 10, 30));
        pane.setLayout(new GridLayout(0, 1));
        pane.add(button);
        pane.add(label);
        setContentPane(pane);
    }

    public void actionPerformed(ActionEvent e) {
        numClicks++;
        label.setText(labelPrefix + numClicks);
    }
    
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(
                UIManager.getCrossPlatformLookAndFeelClassName());
        } catch (Exception e) {
            System.err.println("Couldn't use the cross-platform "
                             + "look and feel: " + e);
        }

        JFrame frame = new HelloSwing();

        WindowListener l = new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        };
        frame.addWindowListener(l);

        frame.pack();
        frame.setVisible(true);
    }
}