import java.awt.*;
import javax.swing.*;
import java.awt.event.*;


public class HelloWorld extends JPanel implements ActionListener{

   int numClicks = 0;

    public HelloWorld() {
        JButton button = new JButton("Click Me");
        button.setPreferredSize(new Dimension(200, 80));
        String lblPrefix = "Number of Clicks: ";
        JLabel label = new JLabel(lblPrefix + numClicks);
        add(button, BorderLayout.CENTER);
        add(label, BorderLayout.CENTER);
        button.addActionListener(this);
    }
    
   public void actionPerformed(ActionEvent e) {
       numClicks++;
   }

    public static void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);

        JFrame frame = new JFrame("Hello World");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JComponent newContentPane = new HelloWorld();
        newContentPane.setOpaque(true); 
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }
    
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}