java通过日期算星期几(java计算日期多少天后)

导语：干货！java由日期得到当天是星期几

public class DateToWeek {

public static String getDateToWeek() throws ParseException{

Calendar calendar=Calendar.getInstance();

SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");

String string=sdf.format(new Date());

Date date=sdf.parse(string);

calendar.setTime(date);

System.out.println(calendar.get(Calendar.DAY_OF_WEEK));

String week="";

switch(calendar.get(Calendar.DAY_OF_WEEK)){

case 1:week="星期日";break;

case 2:week="星期一";break;

case 3:week="星期二";break;

case 4:week="星期三";break;

case 5:week="星期四";break;

case 6:week="星期五";break;

case 7:week="星期六";break;

}

return week;

}

}

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