怎样计算一个日期,在当前年的第几个星期内?

Question

如题

Answer 1

import java.util.Calendar;
import java.util.Date;public class TestCalendar {
    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        Date date = new Date();
        calendar.setTime(date);
        int n = calendar.get(Calendar.WEEK_OF_YEAR);
        System.out.println(n);
    }
}

Answer 2

Calendar cal=Calendar.getInstance();
System.out.println(cal.WEEK_OF_YEAR);

Answer 3

没注意，你是要问给定一个日期， 不是当前的，比如年月日分别为y,m,d
GregorianCalendar g=new GregorianCalendar(y,m-1,d) ;
System.out.println(g.WEEK_OF_YEAR);

Answer 4

Calendar cal=Calendar.getInstance();
String date="2006/1/12";
SimpleDateFormat f=new SimpleDateFormat("yyyy/MM/dd");
cal.setTime(f.parse(date));
System.out.println(cal.get(Calendar.WEEK_OF_YEAR));