java判断日期与星期详解编程语言

import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 
import java.util.GregorianCalendar; 
 
public class Testdouhao { 
    public static void main(String[] args) { 
        int dayu=-7; 
        for(int i=0;i>dayu;i--){ 
        Date    date=new   Date();//取时间 
         Calendar   calendar   =   new   GregorianCalendar(); 
         calendar.setTime(date); 
         calendar.add(calendar.DATE,i);//把日期往后增加一天.整数往后推,负数往前移动 
         date=calendar.getTime();   //这个时间就是日期往后推一天的结果 
    //    System.out.println(date); 
        SimpleDateFormat sFormat=new SimpleDateFormat("yyyyMMdd"); 
        if(getWeekOfDate(date).equals("星期六") ){ 
            --dayu; 
        }else if(getWeekOfDate(date).equals("星期日")){ 
            --dayu; 
        }else{ 
            System.out.println(sFormat.format(date));     
        } 
         
        } 
    } 
    public static String getWeekOfDate(Date dt) { 
        String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"}; 
        Calendar cal = Calendar.getInstance(); 
        cal.setTime(dt); 
 
        int w = cal.get(Calendar.DAY_OF_WEEK) - 1; 
        if (w < 0) 
        w = 0; 
 
        return weekDays[w]; 
        } 
}