急啊，怎么返回一个日期是星期几呢？

Question

Date date = new Date();
怎么返回date的星期数？？

Answer 1

Date d = new Date();
        Calendar c = Calendar.getInstance();
        c.setTime(d);
        System.out.println(c.get(Calendar.DAY_OF_WEEK));

Answer 2

Date date=new Date();
date.getDay();

Answer 3

Calendar calendar = Calendar.getInstance();
int day=calendar.get(Calendar.DAY_OF_MONTH);
System.out.println(day);
不用Date date = new Date();
也可以