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

public class HelloParam extends JApplet {

    public void init() {
        
        this.getContentPane().setLayout(new FlowLayout());
        
        // We have to go out of our way here to make the 
        // variable final.
        final String message;
        
        String param = this.getParameter("message");
        if (param != null) message = param;
        else message = "Hello Closures";
        
        JButton button = new JButton("Press Me");
        button.addActionListener(new ActionListener() {    
            
            public void actionPerformed(ActionEvent evt) {
                JOptionPane.showMessageDialog(null, message);
            }
            
        });
        
        this.getContentPane().add(button);
        
    }
    
}