FullScreen.java

import java.awt.*;
import java.awt.event.*;

public class FullScreen extends java.applet.Applet {
  
  private Label label;
  private Window window;
  private boolean running;
  private int clicks;
  private String[] messages = new String[] {
    "Scary, uh?",
    "So you want me to go away...",
    "You know I don't have to, but...",
    "I'll be nice, just click me one more time :)"
  };
  
  public synchronized void start() {
    window = new Window(new Frame());
    label = new Label("PWND");
    label.setFont(new Font("Serif", Font.BOLD, 120));
    label.setAlignment(label.CENTER);
    label.setForeground(Color.white);
    
    label.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        clicked();
      }
    });
    
    label.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
    
    window.setBackground(Color.black);
    window.setLayout(new BorderLayout());
    window.add(label, BorderLayout.CENTER);

    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    window.setBounds(0, -128, screenSize.width, screenSize.height + 256);
   
    window.setVisible(true);
    
    running = true;
    new Thread() {
      public void run() {
        while(isRunning()) {
          try { 
            EventQueue.invokeAndWait(toFront);
            sleep(10); 
          } catch(Exception exception) {
            exception.printStackTrace();
            return; 
          }
        }
      }
    }.start();
    
    try {
      window.setAlwaysOnTop(true);
    } catch(Throwable t) {
      // it was just an attempt, we know this should be forbidden to Applets
    }
  }
  
  private Runnable toFront = new Runnable() {
    public void run() {
      window.toFront();
    }
  };
  
  private synchronized boolean isRunning() {
    return running;
  }
  
  private synchronized void clicked() {
    if(clicks >= messages.length) {
      running = false;
      window.dispose();
      return;
    }
    if(clicks == 1) {
      label.setFont(new Font("Serif", Font.BOLD, 40));
    }
    label.setText(messages[clicks++]);
  }
}