// Clock.java
// This applet implements an animated digital clock, which 
// is gotten from the system class Date. The applet runs
// in its own thread and is repainted every second. The color 
// of the display is rotated through seven colors.

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

public class Clock extends Applet implements Runnable {
  Font clockFont = new Font ("TimesRoman", Font.BOLD, 24);
  Date currentDate;
  Thread clockThread;
  Color [] colorList = {Color.red, Color.green, Color.blue,
                        Color.magenta, Color.cyan, Color.pink,
                        Color.orange};
  int colorIndex = 0;
  
// Implement the Runnable start method

  public void start() {
    clockThread = new Thread(this);
    clockThread.start();
  }

// Implement the Runnable stop method

  public void stop() {
    clockThread = null;
  }

// Implement the run method from Runnable

  public void run() {
    Thread thisThread = Thread.currentThread();  
    while (clockThread == thisThread) {
      currentDate = new Date();
      repaint();
      try {
        Thread.sleep(1000);
      }
      catch(InterruptedException e) {}
    }  //** end of while (clockThread == ...
  }  //** end of run method

// Override the paint method

  public void paint(Graphics grafObj) {
    if (colorIndex == colorList.length)
      colorIndex = 0;
    grafObj.setFont(clockFont);
    grafObj.setColor(colorList[colorIndex++]);
    grafObj.drawString(currentDate.toString(), 10, 50);
  }  //** end of paint method
}  //** end of Clock class