大虾请进！急急急！

Question

哎呀，去买本JAVA2 高级特性那本书上有的。在交大昂立书店有买的。如果你在上海的话~
你要是真的想要，我星期一到公司，把那本书上的计数器抄给你？如何？MM只能帮到这了~~~回见！

Answer 1

这是我的所写的程序中的计数器模块，真接调用的，你先仔细看一下：
private int count(HttpServletRequest  request,HttpServletResponse response)
　　　{//no12
   int      counter = 0;
   boolean  needreadfile=true;
     String   HomeDirectory="";
     String   HomeTemp="";

try{

HomeDirectory=request.getRealPath("/");
HomeDirectory+="//";

     boolean create=true;
     HttpSession  CountSession=request.getSession(create);

     Integer iNumber=(Integer)CountSession.getValue("SessionCounter.Counter");    try
   {
   if (iNumber==null)
        {
            needreadfile=true;
        }else {
            needreadfile=false;
            counter=iNumber.intValue();
        }           if(needreadfile)
           { //no11
        //read from file
int tmpNumber=0;
             DataInputStream is;
         String b1="";
             try
             {
         is=new DataInputStream(new FileInputStream(HomeDirectory+"counter.txt"));
         try {
                     b1=is.readLine();
                     tmpNumber=Integer.parseInt(b1);
                  }catch (IOException e) {
                     System.out.println("Read from file error!");
                  }
       }catch (FileNotFoundException e) {
                  tmpNumber=0;
             }        counter=tmpNumber+1;        //write to file
       try
       {
         RandomAccessFile countFile=new RandomAccessFile(HomeDirectory+"counter.txt","rw");
         long len=0;
         countFile.seek(len);
         b1=Integer.toString(counter);
         countFile.writeBytes(b1);
         countFile.close();
       }
       catch(IOException e){
         System.out.println("Write to file error!");
       } 
       }//yes11
}catch (NumberFormatException e) 
{
            System.out.println(e.toString());
            counter=98;
     }     String sTemp=""+counter;
     iNumber=Integer.decode(sTemp);
     CountSession.putValue("SessionCounter.Counter",iNumber);
}
catch(NumberFormatException e)
{System.out.println("000000000000804error");}
return counter;
}//yes12

Answer 2

我抄给你落！自己看拉！可花了我不少时间打字哦！不过小M总不食言的！！！！程序如下：import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
  public class TimerTest{
    public static void main(String[] args){
     JFrame f=new TimerTestFrame();
     f.show();
    
    }
  }
 
 
 
   class TimerTestFrame extends JFrame{
      
      public TimerTestFrame(){
       setSize(450,300);
       setTitle("TimerTest");
      
      
       addWindowListener(new WindowAdapter(){
       public void WindowClosing(WindowEvent e){
       System.exit(0);
           }
        });
       
       
       Container c=getContentPane();
       c.setLayout(new GridLayout(2,3));
       c.add(new ClockCanvas("San Jose","GMT-8"));
       c.add(new ClockCanvas("Taipei","GMT+8"));
       c.add(new ClockCanvas("Berlin","GMT+1));
       c.add(new ClockCanvas("New York","GMT-5"));
       c.add(new ClockCanvas("Cairo","GMT+2"));
       c.add(new ClockCanvas("Bombay","GMT+5));
       }
     }
     
     
       interface TimerListener{
         void timeElapsed(Timer t);
       }
       
       
       class Timer extends Thread{
           
           private TimerListener target;
           private int interval;
           
           public Timer(int i,TimerListenr t){
               target=t;
               interval=i;
               setDaemon(true);
            }
           
           
           
           
            public void run(){
           
            try{
           
                  while(!interrupted){
                     sleep(interval);
                     target.timeElapsed(this);
                  }
                  
            }catch(InterruptedException e){}
           
           
            }
            
            
            
       }//end class
       
       
       
       
       
       class ClockCanvas extends JPanel implements TimerListener{
               
           private int seconds=0;
           private String city;
           private int offset;
           private GregorianCalendar calendar;
           
           private final int LOCAL=16;    
               
               
               
               
            public ClockCanvas(String c,String tz){
            
             city=c;
             calendar=new GregorianCalendar(TimeZone.getTimeZone(tz));
             Timer t=new Timer(1000,this);
             t.start();
             setSize(125,125);
            }
            
            
            public void paintComponent(Graphics g){
            
            
             super.paintComponent(g);
             g.drawOval(0,0,100,100);
             double hourAngle=2*Math.PI*(seconds-3*60*60)/(12*60*60);
             double minteAngle=2*Math.PI*(seconds-15*60)/(60*60);
             double secondAngle=2*Math.PI*(seconds-15)/60;
            
            
             g.drawLine(50,50,50+(int)(30*Math.cos(hourAngle)),50+(int)(30*Math.sin(hourAngle)));
             g.drawLine(50,50,50+(int)(40*Math.cos(minuteAngle)),50+(int(40*Math.sin(minuteAngle)));
             g.drawLine(50,50,50_(int)(45*Math.cos(secondAngle)),50+(int)(45*Math.sin(secondAngle)));
            
            
             g.drawString(city,0,115);
            
            
            }
            
            
            
            
            public void timeElapsed(Timer t){
            
               calendar.setTime(new Date());
               second=calendar.get(Calendar.HOUR)*60*60+calendar.get(Calendar.MINUTE)*60+calendar.get(Calendar.SECOND);
               repaint();
               
           }
           
           
        }//end class