Java Source Codes

timer for various time zones

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class TimerTest
{ public static void main(String[] args)
{ JFrame f = new TimerTestFrame();
f.show();
}
}

class TimerTestFrame extends JFrame
{ public TimerTestFrame()
{ setSize(450, 300);
setTitle("TimerTest");

addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
} );

Container c = getContentPane();
c.setLayout(new GridLayout(2, 3));
c.add(new ClockCanvas("San Jose", "GMT-8"));
c.add(new ClockCanvas("Taipei", "GMT+8"));
c.add(new ClockCanvas("Berlin", "GMT+1"));
c.add(new ClockCanvas("New York", "GMT-5"));
c.add(new ClockCanvas("Cairo", "GMT+2"));
c.add(new ClockCanvas("Bombay", "GMT+5"));
}
}

interface TimerListener
{ void timeElapsed(Timer t);
}

class Timer extends Thread
{ public Timer(int i, TimerListener t)
{ target = t;
interval = i;
setDaemon(true);
}

public void run()
{ try
{ while (!interrupted())
{ sleep(interval);
target.timeElapsed(this);
}
}
catch(InterruptedException e) {}
}

private TimerListener target;
private int interval;
}

class ClockCanvas extends JPanel
implements TimerListener
{ public ClockCanvas(String c, String tz)
{ city = c;
calendar = new GregorianCalendar(TimeZone.getTimeZone(tz));
Timer t = new Timer(1000, this);
t.start();
setSize(125, 125);
}

public void paintComponent(Graphics g)
{ super.paintComponent(g);
g.drawOval(0, 0, 100, 100);
double hourAngle = 2 * Math.PI
* (seconds - 3 * 60 * 60) / (12 * 60 * 60);
double minuteAngle = 2 * Math.PI
* (seconds - 15 * 60) / (60 * 60);
double secondAngle = 2 * Math.PI
* (seconds - 15) / 60;
g.drawLine(50, 50, 50 + (int)(30
* Math.cos(hourAngle)),
50 + (int)(30 * Math.sin(hourAngle)));
g.drawLine(50, 50, 50 + (int)(40
* Math.cos(minuteAngle)),
50 + (int)(40 * Math.sin(minuteAngle)));
g.drawLine(50, 50, 50 + (int)(45
* Math.cos(secondAngle)),
50 + (int)(45 * Math.sin(secondAngle)));
g.drawString(city, 0, 115);
}

public void timeElapsed(Timer t)
{ calendar.setTime(new Date());
seconds = calendar.get(Calendar.HOUR) * 60 * 60
+ calendar.get(Calendar.MINUTE) * 60
+ calendar.get(Calendar.SECOND);
repaint();
}

private int seconds = 0;
private String city;
private int offset;
private GregorianCalendar calendar;

private final int LOCAL = 16;
}

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