如何使用java判断String类型的yyyyMMdd是周五还是月末

Question

月末指的是每个月的最后一天，如果正好是在周六、周日，则往前顺延一天，

Answer 1

String sdate = "20120105";
DateFormat df = new SimpleDateFormat("yyyyMMdd");
Date date = df.parse(sdate);
Calendar cal = Calendar.getInstance();
cal.setTime(date);
String[] colname = {
                "日", "一", "二", "三", "四", "五", "六"
            };
int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
System.out.println("今天是星期"+colname[dayOfWeek-1]);
int lastDayOfMonth = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
int nowDay = cal.get(Calendar.DAY_OF_MONTH);
if(nowDay == lastDayOfMonth){
System.out.println("月末");
}

Answer 2

请参考下以下代码
        String date="20110127";
        Calendar calendar=Calendar.getInstance();
        calendar.setTime(new SimpleDateFormat("yyyyMMdd").parse(date));
        int dayOfWeek=calendar.get(Calendar.DAY_OF_WEEK);
        int dayOfMonth=calendar.get(Calendar.DAY_OF_MONTH);
        System.out.println(dayOfWeek);
        System.out.println(dayOfMonth);
        int friday=5;
        int endMonth=calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
        System.out.println(friday);
        System.out.println(endMonth);
        
        if(friday==dayOfWeek){
         System.out.println("今天星期五!");
        }else{
         System.out.println("今天不是星期五,明天接着上班!");
        }
        if(endMonth==dayOfMonth){
         System.out.println("今天月末!");
        }else{
         System.out.println("今天还无到月末!");
        }