平日と自然の日を計算する

Javaでカウントダウンプログラムを書きます.例えば、日付を入力します.フォーマットは20090501で、現在の日付から20090501までの平日と自然の日を計算できます.

import java.text.ParseException;   
import java.text.SimpleDateFormat;   
import java.util.Calendar;   
import java.util.Date;   
  
public class Test1 {   
    public static void main(String[] args) {   
        String time = "20090510";   
        int day1 = 0;//         
        int day2 = 0;//      ，           
        Calendar ca = Calendar.getInstance();   
        Calendar now = Calendar.getInstance();   
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");   
        try {   
            Date date = sdf.parse(time);   
            ca.setTime(date);   
            System.out.println(sdf.format(ca.getTime()));   
        } catch (ParseException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }   
  
        String ss = sdf.format(ca.getTime());   
        if (now.before(ca)) {   
            while (!sdf.format(now.getTime()).equals(ss)) {//          ca.compareTo(now)!＝0      
                if (now.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY   
                        || now.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {   
                    day2++;   
                }   
                day1++;   
                now.add(Calendar.DAY_OF_YEAR, 1);   
            }   
        }   
  
        System.out.println(" " + time + " " + day2 + "   ");   
        System.out.println(" " + time + " " + day1 + "   ");   
    }   
}