用java编写的时钟小程序

import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
public class Clock_clock extends Applet implements Runnable{

  Thread timer=null;
int timeout=166;
int lxh=0,lyh=0,lxm=0,lym=0,lxs=0,lys=0;
Date dummy=new Date();
SimpleDateFormat df=new SimpleDateFormat(" yyyy/MM/dd  HH:mm:ss");
String lastdate=df.format(dummy);
int x,y;

public void paint(Graphics g){
int xh,yh,xm,ym,xs,ys;
int s=0,m=10,h=10;
int cx=80,cy=55;
String today;
Date dat=new Date();
Calendar now=Calendar.getInstance();

h=now.get(Calendar.HOUR_OF_DAY);
m=now.get(Calendar.MINUTE);
s=now.get(Calendar.SECOND);
g.setColor(getBackground());

xs=(int)(45*Math.cos(s*Math.PI/30-Math.PI/2)+cx);
ys=(int)(45*Math.sin(s*Math.PI/30-Math.PI/2)+cy);
xm=(int)(40*Math.cos(m*Math.PI/30-Math.PI/2)+cx);