clock.java

Java做的时钟

// Java Document
import java.awt.*;
import java.util.*;
import java.text.DateFormat;
import java.applet.*;
public class Clock extends Applet implements Runnable
{
	private Thread clockThread;
	public void init()
	{
		setBackground(Color.white);
		clockThread=null;
	}
	public void start()
	{
		if(clockThread==null)
		{
			clockThread=new Thread(this,"Clock");
			clockThread.start();	
		}
	}
	
	public void run()
	{
		while(clockThread!=null)
		{
			repaint();
			try
			{
				Thread.sleep(1000);
			}
			catch(InterruptedException e){}
		}
	}
	public void paint(Graphics g)
	{
		Date date=new Date();
		DateFormat dateFormatter=DateFormat.getTimeInstance();
		g.setFont(new Font("Serif",Font.BOLD,34));
		g.drawString(dateFormatter.format(date),5,30);
	}
	public void stop()
	{
		clockThread=null;
	}
}