//cd d:\JavaTry\Book-Tutorial
//set CLASSPATH=.
//javac Clock.java
//appletviewer Clock.java

import java.awt.*;
import java.util.*;
import java.text.DateFormat;
import java.applet.Applet;

/*
 <applet code="Clock.class" width=100 height=40>
  </applet>
*/
public class Clock extends Applet implements Runnable {
    private Thread clockThread = null;
    public void start() {
        if (clockThread == null) {
 //           clockThread = new Thread(this);
            clockThread = new Thread(this, "Clock");
            clockThread.start();
        }
    }
    public void run() {
        Thread myThread = Thread.currentThread();
        while (clockThread == myThread) {
            repaint();
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e){
            // the VM doesn't want us to sleep anymore,
            // so get back to work
            }
        }
    }
    public void paint(Graphics g) {
        // get the time and convert it to a date
        Calendar cal = Calendar.getInstance();
        Date date = cal.getTime();
        // format it and display it
        DateFormat dateFormatter = DateFormat.getTimeInstance();
        g.setFont(new Font("Serif", Font.BOLD, 20));
        // x=100,y=50の位置から文字列を描画する
        g.setColor(Color.blue);
        g.drawString(dateFormatter.format(date), 10, 25);
    }
    // overrides Applet's stop method, not Thread's
    public void stop() {
        clockThread = null;
    }
}