TTest.rar_ttest

/** @version 1.20 1999-04-27 @author Cay Horstmann */ import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; import javax.swing.Timer; /** This class shows a frame with several clocks that are updated by a timer thread. */ public class TimerTest { public static void main(String[] args) { TimerTestFrame frame = new TimerTestFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); } } /** The frame holding the clocks. */ class TimerTestFrame extends JFrame { public TimerTestFrame() { setTitle("TimerTest"); setSize(WIDTH, HEIGHT); Container c = getContentPane(); c.setLayout(new GridLayout(2, 3)); c.add(new ClockCanvas("America/Los_Angeles")); c.add(new ClockCanvas("America/New_York")); c.add(new ClockCanvas("America/Caracas")); c.add(new ClockCanvas("Europe/Rome")); c.add(new ClockCanvas("Africa/Cairo")); c.add(new ClockCanvas("Asia/Taipei")); } public static final int WIDTH = 450; public static final int HEIGHT = 300; } /** The canvas to display a clock that is updated by a timer. */ class ClockCanvas extends JPanel { /** Constructs a clock canvas. @param tz the time zone string */ public ClockCanvas(String tz) { zone = tz; calendar = new GregorianCalendar(TimeZone.getTimeZone(tz)); Timer t = new Timer(1000, new ActionListener() { public void actionPerformed(ActionEvent event) { calendar.setTime(new Date()); repaint(); } }); t.start(); setSize(WIDTH, HEIGHT); } public void paintComponent(Graphics g) { super.paintComponent(g); g.drawOval(0, 0, 100, 100); int seconds = calendar.get(Calendar.HOUR) * 60 * 60 + calendar.get(Calendar.MINUTE) * 60 + calendar.get(Calendar.SECOND); 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(zone, 0, 115); } private String zone; private GregorianCalendar calendar; public static final int WIDTH = 125; public static final int HEIGHT = 125; }