import java.applet.Applet;
import java.awt.*;

/**
 * Write a description of the applet class Blinker here.
 *
 * @author CSE 341 students
 * @version Nov 15, 2002
 */
public class Blinker extends Applet implements Runnable
{
    // instance variables - replace the example below with your own
    // (none)

    /**
     * Called by the browser or applet viewer to inform this Applet that it
     * has been loaded into the system. It is always called before the first 
     * time that the start method is called.
     */
    public void init()
    {
        // provide any initialisation necessary for your Applet
        Thread blinkThread = new Thread(this);
        blinkThread.start();

    }

    /**
     * Called by the browser or applet viewer to inform this Applet that it 
     * should start its execution. It is called after the init method and 
     * each time the Applet is revisited in a Web page. 
     */
    public void start()
    {
        // provide any code requred to run each time 
        // web page is visited

    }


    /**
     * This may be the most important method in your applet: Here, the 
     * drawing of the applet gets done. "paint" gets called everytime the
     * applet should be drawn on the screen. So put the code here that
     * shows the applet.
     *
     * @param  g   the Graphics object for this applet
     */
    public void paint(Graphics g)
    {
        // simple text displayed on applet
        g.setColor(Color.black);
        g.drawString("Blink Applet", 20, 20);
 
    }


    /** 
     * Called by the browser or applet viewer to inform this Applet that
     * it should stop its execution. It is called when the Web page that
     * contains this Applet has been replaced by another page, and also
     * just before the Applet is to be destroyed. If you do not have any
     * resources that you need to release (such as threads that you may
     * want to stop) you can remove this method.
     */
    public void stop()
    {
        // provide any code that needs to be run when page
        // is replaced by another page or before Applet is destroyed 
    }


    /**
     * Called by the browser or applet viewer to inform this Applet that it
     * is being reclaimed and that it should destroy any resources that it
     * has allocated. The stop method will always be called before destroy. 
     * If you do not have any resources that you need to release you can 
     * remove this method.
     */
    public void destroy()
    {
        // provide code to be run when Applet is about to be destroyed.
    }


    /**
     * Returns information about this applet. 
     * An applet should override this method to return a String containing 
     * information about the author, version, and copyright of the Applet.
     *
     * @return a String representation of information about this Applet
     */
    public String getAppletInfo()
    {
        // replace this with your own info
        return "Title: BlueJ Applet Demo\n" + 
               "Author: CSE 341 students\n" +
               "A simple applet that blinks.";
    }


    /**
     * Returns information about the parameters that are understood by this 
     * Applet. You should return an array of Strings here to provide details
     * about each of the parameters separately.
     * Each element of the array should be a set of three Strings containing 
     * the name, the type, and a description.
     *
     * @return  a String[][] representation of parameter information about 
     *        this Applet
     */
    public String[][] getParameterInfo()
    {
        // provide parameter information about the applet
        String paramInfo[][] = {
             {"firstParameter", "1-10", "description of first parameter"},
             {"secondParameter", "boolean", "description of second parameter"}
        };
        return paramInfo;
    }
    public void run() {
        Thread currentThread = Thread.currentThread();    
        int deltaT = 2000;
        try {
            while (true) {
                setBackground(Color.red);
                currentThread.sleep(deltaT);
                setBackground(Color.blue);
                currentThread.sleep(deltaT);
                }
        }
        catch (InterruptedException e) {}    
    
    }
    }