import java.awt.*;

public class Danger extends javax.swing.JApplet
    implements Runnable {

    String text = "No text has been specified";
    float hue = (float) 0.5;
    float saturation = (float) 0.8;
    float brightness = (float) 0.0;
    Font textFont = new Font("Dialog", Font.BOLD, 20);
    int textX;
    Thread runner;

    public void init() {
        setBackground(Color.black);
        String paramName = getParameter("TEXT");
        if (paramName != null)
            text = paramName;
        FontMetrics fm = getFontMetrics(textFont);
        textX = getSize().width / 2 - fm.stringWidth(text) / 2;
   }

    public void paint(Graphics screen) {
        Graphics2D screen2D = (Graphics2D) screen;
        Color textColor = Color.getHSBColor(hue, saturation,
            brightness);
        screen2D.setColor(textColor);
        screen2D.setFont(textFont);
        screen2D.drawString(text, textX, 30);
    }

    public void update(Graphics screen) {
        paint(screen);
    }

    void pause(int duration) {
        try {
            Thread.sleep(duration);
        } catch (InterruptedException e) { }
    }

    public void start() {
        if (runner == null) {
            runner = new Thread(this);
            runner.start();
        }
    }

    public void stop() {
        if (runner != null) {
            runner = null;
        }
    }

    public void run() {
        Thread thisThread = Thread.currentThread();
        while (runner == thisThread) {
            pause(75);
            brightness += 0.05;
            if (brightness > 1) {
                brightness = (float) 0.0;
                pause(75);
            }
            repaint();
        }
    }
}