java判斷日期與星期

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();//取時間
         Calendar   calendar   =   new   GregorianCalendar();
         calendar.setTime(date);
         calendar.add(calendar.DATE,i);//把日期往后增加一天.整數往后推,負數往前移動
         date=calendar.getTime();   //這個時間就是日期往后推一天的結果
    //    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];
    }

}
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