?? clock.java
字號:
package com.javapatterns.chainofresp.clock;
import java.awt.*;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
public class Clock extends java.applet.Applet implements Runnable
{
private Thread clockThread = null;
//Applet method
public void init()
{
setBackground(Color.green);
}
//Applet method
public void start()
{
if (clockThread == null)
{
clockThread = new Thread(this, "Clock");
clockThread.start(); //thread starts running
}
}
//A Thread method.
public void run()
{
Thread myThread = Thread.currentThread();
while (clockThread == myThread)
{
repaint(); //causes paint() to be called
try
{
Thread.sleep(1000);
}
catch (InterruptedException e) { }
}
}
//An applet method.
public void paint(Graphics g)
{
Calendar cal = Calendar.getInstance();
Date date = cal.getTime();
DateFormat dateFormatter = DateFormat.getTimeInstance();
g.drawString(dateFormatter.format(date), 5, 10);
}
// overrides Applet's stop method, not Thread's
public void stop()
{
clockThread = null;
}
}
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