clock.java

java编程开发技巧与实例的编译测试通过的所有例程

import java.awt.Label;
import java.util.Date;

public class Clock extends Label implements Runnable
{
	private Thread clocker = null;
	public Clock()
	{
		setText(new Date().toString());
	}
	public void start()
	{
		if (clocker == null)
		{
			clocker = new Thread(this);
			clocker.start();
		}
	}
	public void stop()
	{
		clocker = null;
	}
	public void run()
	{
		Thread currentThread = Thread.currentThread();
		while (clocker == currentThread)
		{
			setText(new Date().toString());
			try
			{
				clocker.sleep(1000);
			}
			catch (InterruptedException ie)
			{
				setText("Clock broken");
			}
		}
	}
}