操作系统实验报告-时钟显示

java多线程的应用
该时钟功能分为三部分：1.读取系统时钟 2.构建图形来显示时钟：该部分涉及到java图形编程 3.定期刷新时钟显示：该部分涉及到java多线程机制

import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;

public class myclock extends Applet implements  Runnable{
private volatile Thread timer;
private int lastxs,lastys,lastxm,lastym,lastxh,lastyh;
private SimpleDateFormat formatter;
private String lastdate;
private Font clockFaceFont;
private Date currentDate;
private Color handColor;
private Color numberColor;
private int xcenter=80,ycenter=55;


public void init(){
int x,y;
        lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
formatter = new SimpleDateFormat
          ("yyyy年  MM月 dd日 EEE  H:mm:ss ",Locale.getDefault());  
        currentDate=new Date();
    lastdate=formatter.format(currentDate);

clockFaceFont=new Font("Serif",Font.PLAIN,14);
handColor=Color.blue;

numberColor=Color.darkGray;

try{
setBackground (new Color(
Integer.parseInt(getParameter("fgcolor"),16)));
}catch (NullPointerException e){
}catch (NumberFormatException e){
}
    try{
handColor=new Color(
Integer.parseInt (getParameter("fgcolorl"),16));
    }catch (NullPointerException e){
}catch (NumberFormatException e){
}
try{
numberColor=new Color(
Integer.parseInt (getParameter("fgcolor2"),16));
     }catch (NullPointerException e){
     }catch (NumberFormatException e){
     }
     resize(500,500);
      }
 
//绘制时钟显示部分
public void update(Graphics g){
int xh,yh,xm,ym,xs,ys;
int s=0,m=10,h=10;
String today;

currentDate = new Date();